51
The LsrB protein is required for Agrobacterium tumefaciens interaction with host plants Guirong Tang 1, 2 , Qiong Li 1 , Shenghui Xing 1 , Ningning Li 1 , Zheng Tang 1 , Liangliang Yu 1 , Junhui Yan 1 , Xuan Li 3 , Li Luo 1 1 Shanghai Key Laboratory of Bio-energy Crops, Center of Plant Science, School of Life Sciences, Shanghai University, Shanghai 200444, China; 2 School of Communication & Information Engineering, Shanghai University, Shanghai 200444, China; 3 Key Laboratory of Synthetic Biology, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China Running title: Regulation of A. tumefaciens lsrB upon infection Author for correspondence: Li Luo Tel.:+86 21 66135321 Email: [email protected] Key words: LsrB; Agrobacterium tumefaciens; reactive oxygen species; attachment; exopolysaccharide; infection; gene expression Page 1 of 51 Molecular Plant-Microbe Interactions "First Look" paper • http://dx.doi.org/10.1094/MPMI-02-18-0041-R • posted 03/16/2018 This paper has been peer reviewed and accepted for publication but has not yet been copyedited or proofread. The final published version may differ.

The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

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Page 1: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

The LsrB protein is required for Agrobacterium tumefaciens

interaction with host plants

Guirong Tang1, 2

, Qiong Li1, Shenghui Xing

1, Ningning Li

1, Zheng Tang

1,

Liangliang Yu1, Junhui Yan

1, Xuan Li

3, Li Luo

1

1Shanghai Key Laboratory of Bio-energy Crops, Center of Plant Science, School of

Life Sciences, Shanghai University, Shanghai 200444, China; 2School of

Communication & Information Engineering, Shanghai University, Shanghai 200444,

China; 3Key Laboratory of Synthetic Biology, Institute of Plant Physiology and

Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences,

Shanghai 200032, China

Running title: Regulation of A. tumefaciens lsrB upon infection

Author for correspondence:

Li Luo

Tel.:+86 21 66135321

Email: [email protected]

Key words: LsrB; Agrobacterium tumefaciens; reactive oxygen species; attachment;

exopolysaccharide; infection; gene expression

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Page 2: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

Abstract

Agrobacterium tumefaciens infects and causes crown galls in dicot plants by

transferring T-DNA from the Ti plasmid to the host plant via a type IV secretion

system (T4SS). This process requires appropriate environmental conditions, certain

plant secretions and bacterial regulators. In our previous work, a member of the LysR

family of transcriptional regulators (LsrB) in Sinorhizobium meliloti was found to

modulate its symbiotic interactions with the host plant alfalfa. However, the function

of its homologue in A. tumefaciens remains unclear. In this study, we show that the

LsrB protein of A. tumefaciens is required for efficient transformation of host plants.

An lsrB deletion mutant of A. tumefaciens exhibits a number of defects, including in

succinoglycan production, attachment, and resistance to oxidative stress and iron

limitation. RNA-sequencing analysis indicated that 465 genes were significantly

differentially expressed (upregulation of 162 genes and downregulation of 303 genes)

in the mutant compared to the wild-type strain, including those involved in

succinoglycan production, iron transporter and detoxification enzymes for oxidative

stress. Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A.

tumefaciens rescued the defects observed in the S. meliloti or A. tumefaciens lsrB

deletion mutant. Our findings suggest that a conserved mechanism of LsrB function

exists in symbiotic and pathogenic bacteria of the family Rhizobiaceae.

Introduction

Agrobacterium tumefaciens is a facultative plant pathogen that induces crown gall

diseases in dicot plants. During infection, a DNA fragment (T-DNA) from the A.

tumefaciens Ti plasmid is transferred to plant cells and integrates into the plant

genome; the transgene-encoded proteins drive the synthesis of phytohormones,

cytokinins and auxin, which elicit plant cell proliferation and tumourigenesis (White

and Braun, 1941; Thomashow et al., 1984). This process requires the VirB/D4 type IV

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secretion system (T4SS) of A. tumefaciens. Because of its ability to transfer DNA to

plants, A. tumefaciens has been developed as an important tool in plant genetic

transformation and engineering (Azpiroz-Leehan and Feldmann, 1997).

The virulence (vir) gene located on the Ti plasmid is essential for T-DNA transfer and

tumorigenesis. A. tumefaciens possesses a VirA/VirG two-component regulatory

system that senses important environmental signals, including acidity,

monosaccharides, and phenolic compounds such as acetosyringone (AS), which are

released by wounded plant cells, to regulate vir gene induction (Shimoda et al., 1990;

Palmer et al., 2004; Brencic and Winans, 2005; Bhattacharya et al., 2010; Pitzschke

and Hirt, 2010; Lacroix and Citovsky, 2013). Plants generate high levels of reactive

oxygen species (ROS), such as H2O2 and superoxide radicals, which are employed in

an important initial defence mechanism to inhibit bacterial invasion and proliferation

(Baker and Orlandi, 1995). Catalase (CAT) and superoxide dismutase (SOD) are

crucial antioxidant enzymes that degrade H2O2 and superoxides, respectively. These

enzymes have been shown to serve as virulence factors involved in A. tumefaciens

tumorigenesis (Xu and Pan, 2000; Saenkham et al., 2007). Iron ions are also key

players in maintaining redox homeostasis in bacteria. Homologous iron-sensing

regulatory ferric uptake regulation (fur) genes from plant pathogens have been shown

to play a critical role during plant-pathogen interaction (Franza et al., 1999;

Subramoni and Sonti, 2005). In addition, plant mechanisms for depriving invading

microbes of iron have been suggested (Neema et al., 1993). Therefore, plant

pathogens need to overcome both oxidative stress and iron deprivation for survival

and proliferation in host plants. The A. tumefaciens catalase KatA is an important

virulence factor involved in the detoxification of H2O2 released from plant tumours

(Xu and Pan, 2000; Xu et al., 2001). Expression of katA in A. tumefaciens is regulated

by OxyR, a LysR family transcriptional regulator that is responsible for bacterial

resistance to oxidative stress (Nakjarung et al., 2003). A. tumefaciens, B. abortus and

S. meliloti are members of Rhizobiaceae family and these are conserved in a much

larger family, such as OxyR/KatA homologues (Jamet et al., 2005).

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In our previous work, a new LysR family transcriptional regulator gene, lsrB, required

for nodulation and nitrogen fixation (Luo et al, 2005) was identified in Sinorhizobium

meliloti. A lsrB deletion mutant induced the formation of inefficient nitrogen-fixing

root nodules on host alfalfa plants (Medicago sativa) (Tang et al., 2013). As LsrB

directly regulates the expression of genes involved in lipopolysaccharide biosynthesis

and glutathione production (Lu et al., 2013; Tang et al., 2014), it constitutes a new

redox regulator in S. meliloti (Tang et al. 2017). A homologue of lsrB has also been

identified in Brucella species (Foulongne et al., 2000; Sheehan et al., 2015). However,

the function of LsrB in A. tumefaciens has not yet been determined.

In this work, we constructed an A. tumefaciens lsrB deletion mutant and examined it

for both free-living and pathogenic phenotypes. We identified new functions of LsrB

in A. tumefaciens and also compared the functions and mechanisms of three LsrB

proteins from B. abortus, S. meliloti and A. tumefaciens. A conserved mechanism of

LsrB in all three species is proposed.

Results

Expression of the pathogenic bacterial lsrB gene rescued the symbiotic defects of

the S. meliloti lsrB mutant.

Homologous lsrB genes have been identified in several bacterial species, including

members of Sinorhizobium and Brucella (Tang et al., 2013; Sheehan et al., 2015). The

LsrB proteins from A. tumefaciens and B. abortus share 88% and 69% identity with

the S. meliloti LsrB protein, respectively. These proteins are composed of a

DNA-binding domain and a LysR substrate-binding domain (Fig. 1A and Fig. S1),

and the observed protein sequence identity suggests that they may share the same

function or mechanism of action.

To assess this possibility, the S. meliloti lsrB deletion (∆lsrB) mutant, which induces

defective nitrogen-fixation nodules on alfalfa, was used in a symbiotic nodulation

assay with alfalfa plants (Tang et al., 2013). In Rhizobium-legume symbiosis, mutants

that induce less effective nitrogen -fixation nodules can induce the production of a

larger number of the plant organs (Oka-Kira and Kawaguchi, 2006). The lsrB gene

from A. tumefaciens or B. abortus was expressed in the S. meliloti ∆lsrB mutant, and

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each strain was inoculated onto alfalfa seedlings. After four weeks, the growth of

plants inoculated with the lsrB deletion mutant expressing the lsrB gene from either A.

tumefaciens or B. abortus was similar to that of plants inoculated with the wild-type

strain of S. meliloti (Rm1021) (Fig. 1B). Additionally, the biomass (dry weight) and

number of nodules of plants induced by the mutant expressing lsrBat or lsrBba were

found to be similar to those induced by Rm1021 (Fig. 1C-D). These results indicate

that the lsrB gene from A. tumefaciens or B. abortus completely rescued the symbiotic

defects of the S. meliloti lsrB deletion mutant, suggesting that these LsrB proteins

have conserved physiological functions or molecular mechanisms in both symbiotic

and pathogenic bacteria.

The A. tumefaciens ∆lsrB mutant is deficient in host plant transformation.

To determine new functions of the lsrB gene during interactions with hosts, an A.

tumefaciens lsrB deletion mutant was constructed using a suicide-plasmid

homologous recombination method (see Materials and Methods). For the

complementation analysis, a plasmid expressing the lsrB gene from A. tumefaciens, B.

abortus or S. meliloti was introduced into the ∆lsrB mutant. In addition, a

plant-expression vector pCAMBIA2301 (Cambia, Canberra, Australia) carrying a

CAMV-35S driven-GUS gene was transferred into each A. tumefaciens strain for the

plant transformation assay. Roots of young Arabidopsis seedlings were treated with

each strain, and β-glucuronidase (GUS) activity in wounds was determined. The

results showed that the lsrB deletion mutant induced fewer (less than 1/10 as many)

transformation events than the parent strain C58 C1, whereas the plasmid expressing

the lsrB gene from A. tumefaciens, B. abortus or S. meliloti completely rescued the

defect of the mutant (Fig. 2A-F). These results suggest that LsrB is required for A.

tumefaciens transformation of host plants.

The lsrB gene is required for efficient attachment of A. tumefaciens onto host

plants.

As bacterial attachment is a key step in the infection of a host plant by A. tumefaciens

(Lippincott and Lippincott, 1969), we therefore evaluated the attachment efficiency of

the A. tumefaciens lsrB deletion mutant onto Arabidopsis roots. Roots were soaked in

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fresh cell suspensions of A. tumefaciens constitutively expressing green fluorescent

protein (GFP), and attached cells were analysed under a fluorescence microscope after

two hours. Compared to Arabidopsis roots inoculated with the parent strain C58C1,

weaker fluorescence intensity was observed in the Arabidopsis roots inoculated with

the lsrB deletion mutant (Fig. 3A-B). This defect was rescued by expressing the lsrB

gene from A. tumefaciens, B. abortus or S. meliloti (Fig. 3C-E). The numbers of

bacterial cells attached to the plant roots were counted by diluting and plating samples;

significantly fewer cells of the lsrB deletion strain were present compared to the

parent strain C58C1, and higher counts were observed after introducing the lsrB gene

from any of the three bacterial species (Fig. 3F). These results suggest that LsrB is a

positive regulator of Agrobacterium attachment onto host plants.

The LsrB protein positively regulates succinoglycan and biofilm production in A.

tumefaciens.

The A. tumefaciens lsrB deletion mutant grew slightly slower in liquid medium

compared with the parent strain C58C1, and this defect was rescued by the expression

of the lsrB gene from A. tumefaciens, B. abortus or S. meliloti (Fig. S2). Interestingly,

the colonies of the lsrB deletion mutant did not appear mucoid, which prompted us to

evaluate exopolysaccharide (EPS, succinoglycan) production by the mutant. The

fluorescent stain Calcofluor White M2R, which can specifically bind to succinoglycan,

was used to evaluate succinoglycan production by A. tumefaciens, showing that the

colonies of the lsrB deletion mutant produced weaker fluorescence than did the

wild-type strain (Fig. 4A). The introduction of plasmids expressing the lsrB genes

from A. tumefaciens, B. abortus or S. meliloti restored succinoglycan production in

the lsrB deletion mutant (Fig. 4A). Quantitative analysis of the fluorescence intensity

revealed that 5-fold more succinoglycan was produced by the parent and

complemented strain compared to the lsrB deletion mutant (Fig. 4B). The total sugar

content in the exopolysaccharide produced by A. tumefaciens growing in broth was

analysed using an anthrone sulphuric acid method, and the results revealed

significantly decreased total sugar for the lsrB mutant compared with the parent or

complemented strain (Fig. 4C). Additionally, biofilm formation by each A.

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tumefaciens strain in tubes was examined. Based on visual inspection, the lsrB mutant

formed only a small amount of biofilm, whereas the parent and complemented strains

produced a large amount of biofilm. Furthermore, quantification of the biofilm using

crystal violet showed less biofilm on tubes formed by the lsrB deletion mutant

compared to the parent or complemented strain (Fig. 4D). These results indicate that

the LsrB protein positively regulates succinoglycan production and biofilm formation

in A. tumefaciens.

The LsrB protein is essential for A. tumefaciens adaptation to oxidative stress

and iron limitation.

The increased expression of KatA exhibited by the S. meliloti lsrB deletion mutant

(Tang et al., 2013) suggests that this mutant is sensitive to oxidative stress. Similarly,

in the present study, we hypothesized that the A. tumefaciens lsrB deletion mutant

may also be sensitive to these oxidizing agents. To test this possibility, cell sensitivity

assays using hydrogen peroxide (H2O2) and sodium nitroprusside (SNP) were

performed. A. tumefaciens ∆lsrB cells were found to be hypersensitive to 10 mM

H2O2 and 10 mM SNP (Fig. 5), and this defect was rescued by expressing of the lsrB

gene from A. tumefaciens, B. abortus or S. meliloti (Fig. 5). These results suggest that

the ability of A. tumefaciens to resist oxidative stress is positively influenced by the

LsrB protein.

Bacterial adaptation to oxidative stress is associated with intracellular redox

homeostasis, which is influenced by levels of iron ions. To determine whether A.

tumefaciens lsrB contributes to iron transport, sensitivity to Dipy (2, 2-dipyridyl, a

metal ion chelator) was analysed. Our data indicated that the lsrB deletion mutant was

hypersensitive to Dipy both on solid and liquid media, and this defect was rescued by

expressing the lsrB gene from A. tumefaciens, S. meliloti or B. abortus (Fig. 6).

Moreover, addition of FeCl3 was able to restore the resistance of the mutant to Dipy

(Fig. 6). These data indicate that LsrB is a positive regulator of iron homeostasis in A.

tumefaciens.

The lsrB deletion mutant exhibits decreased survival in infiltrated tobacco

leaves.

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To confirm that LsrB is required for A. tumefaciens transformation of host plants,

young tobacco leaves were used for infiltration experiments with suspensions of

bacteria harbouring the GUS reporter gene. Staining results indicated a lower level of

GUS expression in leaves infiltrated with the lsrB deletion strain than in leaves

infiltrated with the parent strain C58 C1 at the same bacterial density (Fig. 7A). It is

well known that plant wounds release several chemicals, including ROS (superoxide

anions and hydrogen peroxide) (Baker and Orlandi, 1995). To determine factors

affecting transformation efficiency, nitrobluetetrazolium (NBT) staining was used to

assess superoxide anion radical accumulation. The data confirmed that infiltrated

tobacco leaves produced large amounts of O2- (Fig. 7B-C). In addition, the bacteria

infiltrated into tobacco leaves were recovered, plated and counted. Starting one day

after inoculation, we detected a lower recovered bacterial cell density of the lsrB

deletion mutant than with the parent strain (Fig. 7D and Fig. S3), suggesting that the

proliferation or survival of A. tumefaciens cells in the wounds of host plants requires

the LsrB protein and may be associated with ROS sensitivity.

Downstream gene expression in the A. tumefaciens lsrB deletion mutant.

Due to the multiple phenotypic defects induced by lsrB deletion in A. tumefaciens, it

seemed plausible that multiple genes are differentially expressed in the mutant

compared with the parent strain. To assess this possibility, the whole-genome

transcriptomes of both the deletion mutant and the parent strain were analysed by

RNA-sequencing (RNA-Seq) (Table S3), and genes identified as being differentially

expressed were selected for confirmation by quantitative reverse transcription

polymerase chain reaction (RT-qPCR). The transcript levels of 14 of the selected

genes (attD, exoV, exoC, exoP, oxyR, trxA, Atu3676, Atu3679, Atu3680, Atu3688

(fecB), Atu3690 (fecD) and Atu3691 (fecE)) were decreased in the lsrB deletion

mutant, and oxidative stress (katA) and succinoglycan production (exoR) were

increased in the lsrB deletion mutant (Fig. 8). These data indicate that the expression

of several genes associated with adaptation to oxidative stress (oxyR, trxA),

succinoglycan production (exoV, exoC, exoP), siderophore biosynthesis (fecB, fecD,

fecE) and iron transporter (Atu3676, Atu3679, Atu3680) is positively regulated by the

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LsrB protein.

Discussion

A. tumefaciens causes crown gall on plants and is used in plant genetic engineering.

Transformation of plant cells via A. tumefaciens depends on bacterial adaptation to

the environment of plant wounds. Indeed, bacteria have developed several strategies

to perceive environmental signals from plant wounds to reprogramme their gene

expression. Members of the LysR-type family of regulators are able to sense

environmental cues and function as key players in these processes (Schell, 1993;

Maddocks and Oyston, 2008). The lsrB gene, which was first identified in B. suis

(Foulongne et al., 2000) and later in S. meliloti (Luo et al., 2005), is essential for

alfalfa nodulation and nitrogen fixation by S. meliloti (Tang et al., 2013) and for

Brucella infection and survival in a human cell line and mice (Tang et al., 2013;

Sheehan et al., 2015). In this study, we found that LsrB, an A. tumefaciens LysR

family regulator, overcomes both oxidative stress and iron deprivation and controls

transformation efficiency in host plants. These findings are important for

understanding the regulatory mechanism of the interaction of A. tumefaciens with its

hosts.

For many years, att genes were proposed to mediate attachment and were also

reported to be required for virulence (Matthysse et al., 2000). However, the genome

sequence of A. tumefaciens C58 (Goodner et al., 2001; Wood et al., 2001) revealed the

att cluster to be located on the plasmid pAtC58, which is known to be dispensable for

virulence (Hynes et al., 1985). Analysis using isogenic derivatives revealed that

pAtC58 has only mild effects on virulence gene expression, with no obvious impact

on attachment (Nair et al., 2003). Although our data do not address whether the att

genes are directly associated with attachment, we note that it did find significantly

lower expression of attD as well as diminished attachment with the lsrB mutant (Figs.

3 and 8). Additionally, the avhB genes, these encode the T4SS that mediates

conjugation of pAtC58 was also decreased in the lsrB mutant (Table S3), this could

possibly be relevant to the diminished attachment.

Based on the results of our study, LsrB is a positive regulator of exopolysacchride

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(including succinoglycan) production (Fig. 4), and we confirmed that LsrB positively

regulates succinoglycan biosynthesis by activating exo gene expression (Fig. 8). For

example, expression of exoR was upregulated in the lsrB deletion mutant. ExoR acts

as a negative regulator of succinoglycan biosynthesis by suppressing the ChvG/ChvI

two-component system, which directly activates expression of exo genes in both S.

meliloti and A. tumefaciens (Wells et al., 2007; Chen et al., 2008; Wu et al., 2012).

Therefore, our data suggest that increased levels of ExoR led to the repression of the

exo genes via ChvG/ChvI.

The plant transformation deficiency of the lsrB deletion mutant might largely result

from the decrease in bacterial adaptation to the environment. In this study, we found

the free-living lsrB mutant to be sensitive to oxidants (Fig. 5), which is consistent

with the observations in plants (Fig.7). Upon wounding, an oxidative burst is induced

in plants (Fig. 7B-C), and the sensitivity of the mutant to this condition may lead to

bacterial cell death (Fig. 7D). We also observed the mutant to be hypersensitive to

iron limitation (Fig. 6). Iron transport plays a crucial role in redox homeostasis (Imlay

et al., 1988), and iron limitation has been suggested to occur during bacterium-plant

interactions (Neema et al., 1993; Mila et al., 1996); thus, iron-limitation sensitivity

may also contribute to bacteria survival in wounds. Consistently, the expression of

genes related to the oxidative response and detoxification and iron transporters was

correspondingly altered in the mutant (Fig. 8).

The regulatory mechanism of LsrB in bacteria may be conserved. First, the lsrB gene

from B. abortus, A. tumefaciens or S. meliloti can complement the lsrB deletion

mutant phenotype in A. tumefaciens and S. meliloti (Figs. 1-6). Second, the LsrB

protein could directly regulate expression of lrp3 (though function of this gene is not

clear) in both S. meliloti and A. tumefaciens, as conserved TN11A boxes are predicted

to be present in the lrp3 promoter (Fig. S4) and the LsrB proteins directly binds to the

lrp3 promoter region in S. meliloti (Tang et al., 2014). In summary, our results reveal

that LsrB is a global regulator in the interaction of A. tumefaciens with host plants, a

finding that is important for understanding the molecular mechanism and evolution of

bacterial adaptation to biotic environments.

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Materials and Methods

Bacterial strains, plasmids, and growth conditions.

All bacterial strains and plasmids used in this study are listed in Table S1. The

reagents and medium components were obtained from Dingguo Corporation (Beijing,

China) and Sigma-Aldrich (Mainland, China). All restriction enzymes and molecular

biology reagents were purchased from TakaRa (Dalian, China). DNA sequences were

determined by Shanghai RuiDi Biological Technology Corporation. The

oligonucleotide primers used in this study are listed in Table S2. Escherichia coli was

grown aerobically at 37°C in Luria-Bertani (LB) medium (Sambrook et al., 1989). A.

tumefaciens were grown aerobically at 28°C in yeast tryptone (TY) medium (Beringer,

1974) or Luria-Bertani (LB) medium. Antibiotics were used at the following

concentrations: chloramphenicol, 10 µg mL-1

; kanamycin, 50 µg mL-1

; gentamicin, 10

µg mL-1

; streptomycin, 500 µg mL-1

; rifampicin, 50 µg mL-1

and timentin, 200 µg

mL-1

.

Construction of deletion strains.

The constructed plasmids and primers used in this study are listed in Tables S1 and S2,

respectively. Fragments upstream and downstream of lsrBat were amplified using

primers P1 and P2 (upstream) and P3 and P4 (downstream). Primer P2 was designed

such that the 5’ sequence had reverse complementarity to primer P3. The

complementary sequence of these two primers facilitated splicing by overlapping the

extension of the two PCR products. Both flanking sequences were amplified and gel

purified. The two purified products were then used as both templates and primers (P1

and P4) in a second PCR reaction to generate the final spliced product, which was

ligated to pmD18 (TakaRa) and sequenced. The deletion construct was then excised

using restriction enzymes and ligated to the suicide vector pk18mobsacB (Schafer et

al., 1994) to produce plasmid pA1. The pk18mobsacB plasmid confers kanamycin

resistance and sucrose sensitivity. Plasmid pA1 was introduced into A. tumefaciens

C58C1 (Jelenic et al., 2000) via mating using MT616 (Finan et al., 1984), and A.

tumefaciens C58C1 was obtained from Shanghai Weidi Biotechnology Co., Ltd.

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Exconjugants with kanamycin resistance were screened on LB plates and selectively

grown on fresh LB plates containing 13% sucrose. The resulting colonies were tested

for neomycin sensitivity. Corrected lsrBat mutants were confirmed by PCR using

primers (P5/P6) flanking the deletion site.

Plasmid expression constructs.

To construct a plasmid for complementation of the ∆lsrBat mutant, an lsrB DNA

fragment that included the native promoter was PCR amplified from the genomic

DNA of A. tumefaciens C58C1 using primers P9/P10. The PCR product was cloned

into pSRK (Khan et al., 2008), and the plasmid was named plsrBat. The B. abortus

2308 lsrB homologue, including its native promoter, was amplified using primers

P7/P8 and cloned into pSRK; the plasmid was named plsrBba. The S. meliloti 1021

lsrB homologue, including its native promoter, was amplified using primers P11/P12

and cloned into pSRK; the plasmid was named plsrBsm. The constructs were

introduced into the ∆lsrBat strain via conjugation.

RNA extraction.

Subcultures were started by inoculation of 50 mL of fresh TY medium with 5% of

overnight cultures and allowed to grow to log phase (OD600 = 0.5), RNA was isolated

using TRIZOL Reagent (Invitrogen, 15596026) and cDNA was prepared using a kit

(TakaRa, 0047A). An Agilent 2100 Bioanalyzer was used to assess the integrity of the

RNA samples. RNA-Seq was carried out by Shanghai Bohao Biological Technology

Corporation. The accession number for the RNA-seq date is GEO: GSE108845.

qPCR primers were designed to amplify approximately 200-bp sequences from the

indicated genes. The primer sequences are provided in Table S2. The qPCR procedure

was performed with SYBR Green reagent (YEASEN, Shanghai, China). Sample

values were normalized using a ropD primer set and calibrated against the results for

wild-type.

Nodulation tests.

Nodulation assays using alfalfa plants were performed as reported previously (Tang et

al., 2013). Briefly, alfalfa seeds were surface sterilized and germinated. Alfalfa

seedlings were soaked for 30 min in a diluted bacterial solution (OD600 = 0.05), and

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luodf
高亮
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transferred to pots filled with a mixture of autoclaved vermiculite and perlite (3:1).

After inoculation, the number of nodulated plants and the dry weight of shoots were

recorded for four weeks. The plants were watered with autoclaved nitrogen-free liquid

medium every 3 days.

Transient GUS activity assays of Arabidopsis plants.

Transient Agrobacterium-mediated transformation assays were performed as

described by Nam et al. (Nam et al., 1999) and Mysore et al. (Mysore et al., 2000).

For transient GUS activity assays (Mestiri et al., 2014), root segments from

10-day-old seedlings grown in vitro were pooled and co-cultivated with A.

tumefaciens harbouring the binary vector pCAMBIA2301 (Cambia, Canberra,

Australia) in hormone-free Murashige and Skoog (MS) medium for 48 h at 22°C.

Next, the seedlings were washed once in hormone-free MS medium and then cultured

in hormone-free MS medium supplemented with timentin for an additional 4 days to

kill the bacteria. Roots were subsequently stained with GUS buffer (100 mM

Na2HPO4, 100 mM KH2PO4, 10 mM EDTA, 0.5 mM K3Fe(CN)6, 0.5 mM K4Fe(CN)6,

1 mg mL-1

x-gluc, pH 7.0) overnight at 37°C. The stained samples were rinsed three

times with 1× phosphate-buffered saline (PBS) and cleared in different concentrations

of ethanol. The number of blue spots per root segment was counted, and three

independent experiments were performed.

Plant attachment assays.

Arabidopsis root attachment assays were carried out as previously described

(Tomlinson et al., 2010), with minor modifications. Roots of 5-day-old A. thaliana

seedlings grown on MS agar medium were transferred to sterile dishes containing 15

mL 1 mM CaCl2 and 0.4% sucrose. Next, the seedlings were inoculated with OD600 =

0.01 of the appropriate derivative strain of A. tumefaciens carrying the GFP reporter

plasmid pHC60 (Cheng and Walker, 1998). Ten root segments were inoculated per

strain. After 2 h of incubation in the dark at room temperature, the root segments were

rinsed and resuspended in fresh calcium chloride/sucrose solution. Five roots were

used to count the number of bacteria (colony-forming units (CFU) mL-1

), and another

five roots were sealed under coverslips. Fluorescence microscopy was performed

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under a Nikon microscope.

Transient GUS activity assays of tobacco plants.

A. tumefaciens cells harbouring the binary vector pCAMBIA2301 were harvested by

centrifugation. The cells were suspended in sterile water to an optical density OD600 of

0.2, corresponding to approximately 2 × 107

colony-forming units (CFU) per mL.

Half of a leaf (four weeks) was infiltrated with the A. tumefaciens C58C1 bacterial

suspension through the stomata on the abaxial side using a 1 mL plastic syringe

(without a needle). The second half of the leaf was inoculated with the ∆lsrBat

mutant. After 2 days, the leaves were stained with with x-gluc and

Nitrobluetetrazolium (NBT ) buffer.

Surviving bacterial counts.

To determine bacterial growth in tobacco leaves, wild-type tobacco plants (six weeks

old) were syringe inoculated with the C58C1 or ∆lsrBat strain (5 × 106 CFU/mL). The

internal bacterial number was determined at several time points (after 0, 1, 2, 3, 4 dpi)

via surface sterilization of a 1-cm2 section of inoculated plants with 5% H2O2 for 3

min (Ishiga and Ichinose, 2016). After washing three times with 100 µL sterile

distilled water, the plants were homogenized in sterile distilled water and the diluted

samples were plated on LB medium. Two to three days after plating of the diluted

samples, the bacterial CFU were counted. Bacterial numbers were evaluated in three

independent experiments.

Assay of superoxide anion radicals.

NBT (Sigma) was used to detect superoxide. Samples were stained with 3.5 mg/mL

NBT in 0.1 M potassium phosphate at pH 7.0 and vacuum-infiltrated three times (10

min each) in NBT staining solution. After infiltration, leaves were stained for 2 h at

room temperature followed by a wash with distilled water. The samples were then

cleared in 75% ethanol.

Assay for succinoglycan or EPS levels.

A. tumefaciens colonies were inoculated into LB liquid medium and grown overnight

at 28°C with shaking. The cultures were normalized to an OD600 of 0.2, and 5 µL was

spotted onto LB plates supplemented with 0.02% Calcofluor White M2R (Sigma).

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The plates were incubated for 2 days at 28°C, and succinoglycan production was

visualized under visible and UV light (Yao et al., 2004; Wang et al., 2013). All strains

were imaged using the same exposure value. The fluorescence intensity was analysed

using ImageJ Software. Next, 0.25 mL of A. tumefaciens strains, cultured to stationary

phase in LB, and 0.75 mL of isopropanol was added to precipitate EPS. The pellet

was washed once with 70% ethanol, air dried, redissolved in 0.25 mL of distilled

water, and used for total EPS measurements using the sulphate-anthrone method

(Wang et al., 2010).

Biofilm formation.

Biofilm formation in glass tubes was investigated using the method described by

Calatrava-Morales et al. (Calatrava-Morales et al., 2017), with modification. Briefly,

outgrown cultures of the tested strains were diluted 100-fold in glass tubes containing

4 mL fresh LB broth. The tubes were incubated for 48 h at 28°C under shaking

conditions for quantification of biofilm levels. After incubation, liquid from the tubes

was removed, and the bacterial biofilms were stained with 4 mL 0.1% crystal violet

solution (Sigma-Aldrich) for 20 min. The tubes were carefully washed three times

with deionized water to eliminate excess crystal violet. The crystal violet was

solubilized by the addition of 2 mL acetic acid (30% v/v), and absorbance at 590 nm

was used for quantification of the solubilized crystal violet stain.

Assay of oxidative stress sensitivity.

The sensitivity of A. tumefaciens to SNP was examined by growing cells in LB

medium at 28°C with shaking at 200 rpm/min to OD600 = 0.5, followed by

centrifugation. The cultures were serially diluted tenfold in LB broth, and aliquots (5

µL) were spotted onto LB agar supplemented with 10 mM H2O2 or 10 mM SNP to

determine the oxidative resistance of the strains at 28°C for 4 d.

Sensitivity to Dipy.

Overnight cultures grown in TY medium were washed once with fresh TY medium;

the cells were diluted to an OD600 of 0.05, and an iron-limiting condition was

achieved by adding 0.1 mM concentration of the iron chelator 2,2-dipyridyl (Dipy;

Sigma). Growth was monitored by measuring the OD600 after incubation at 28°C with

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shaking for 36 h. The effect of addition of metal ions on bacterial growth in the

presence of Dipy was assayed on TY agar plates. Overnight cultures grown in TY

medium were washed and adjusted to an OD600 of 0.03 in TY medium. Tenfold serial

dilutions were made. An aliquot (5 µL) of each dilution was spotted onto TY agar

plates containing 0.2 mM Dipy and 0.1 mM of FeCl3 and then incubated at 28°C for 4

d. Cells spotted onto an TY agar plate were used as a control.

Growth curves.

Bacteria were cultured in LB broth, and cells in the exponential growth phase were

diluted in fresh medium to OD600 = 0.05. The cell density (optical density at 600 nm

[OD600]) was monitored at each time point.

DNA sequence analysis.

The deduced protein sequence of LsrB was downloaded from the Sinorhizobium

meliloti genome site (http: //iant.Toulouse.inra.fr/bacteria/annotation/cgi/rhime.cgi).

Homologues of LsrB were aligned and downloaded from NCBI Blast Microbial

Genomes (http: //www.ncb i.nlm.nih.gov/sutils/genome_table.cgi).

Acknowledgements

This research was supported by the Natural Science Foundation of China (31570241

to L. L., 31500058 to G. T. and 31500197 to L. Y.) and the Shanghai Key Program of

Supporting (15230500100 to L. L.). We thank Dr. Shengqing Yu for gift of B. abortus

2308 genomic DNA.

Author contributions

L. L. and G. T. designed research; G. T., S. X., Q. L., N. L., L. Y., J. Y., and T. Z.

performed research; X. L., G. T., and L. L. analyzed data; L. L. and G. T. wrote the

paper.

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Legends

Fig. 1. Conservation among LsrB proteins from S. meliloti, A. tumefaciens and B.

abortus. (A) Domain organization of LsrB proteins from S. meliloti, A. tumefaciens

and B. abortus. LsrB proteins consist of DNA-binding and substrate-binding domains.

LsrB homologues from A. tumefaciens and B. abortus share 88% and 69%,

respectively, similarity in amino acid sequence with the protein from S. meliloti,

respectively. (B) An alfalfa plant growth after inoculation of the S. meliloti ∆lsrB

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strain expressing an A. tumefaciens or B. abortus. lsrB homologue. (C) Nodule

numbers of alfalfa plants inoculated with S. meliloti strains. (D) Biomass of alfalfa

plants inoculated with S. meliloti strains. Experiments were performed three times.

Forty-five alfalfa seedlings were inoculated with each S. meliloti strain. Vertical bars

indicate the standard error for three independent experiments. An asterisk denotes a

significant difference from Rm1021/vec in a t-test (* < 0.05 ). ∆lsrB, the deletion

mutant of lsrB in the S. meliloti 1021 background; plsrBat, the lsrB gene of A.

tumefaciens C58C1 expressed from the plasmid pSRK-Gm; plsrBba, the lsrB gene of

B. abortus expressed from the plasmid pSRK-Gm; vec, the plasmid pSRK-Gm.

Fig. 2. Transformation of Arabidopsis of wounded roots by A. tumefaciens strains.

(A-E) Arabidopsis root segments transformed by different A. tumefaciens strains

carrying pCAMBIA2301. (F) Mean numbers of blue spots in Arabidopsis root

segments induced by each different A. tumefaciens strain. Experiments were

performed three times. Over 50 Arabidopsis seedlings were inoculated with each A.

tumefaciens strain carrying pCAMBIA2301. Vertical bars indicate the standard error

for three independent experiments. An asterisk denotes a significant difference from

C58C1/vec in a t-test (* < 0.05 ). Bars, 1 mm.

Fig. 3. Attachment to Arabidopsis roots by A. tumefaciens strains. (A-E)

Attachment of A. tumefaciens cells to Arabidopsis roots. (F) Number of bacteria

attached to Arabidopsis roots. Experiments were performed three times. Over 20

Arabidopsis seedlings were inoculated with each A. tumefaciens strain carrying

pHC60 (a constitutive GFP construct). Vertical bars indicate the standard error for

three independent experiments. An asterisk denotes a significant difference from

C58C1/vec in a t-test (* < 0.05 ). Bars, 1 mm.

Fig. 4. Exopolysaccharide (EPS) production and biofilm formation by A.

tumefaciens strains. (A) EPS stained by Calcofluor White. OL, Bacterial colonies

under optical light; UV, bacterial colonies under UV. (B) Fluorescence intensity of

EPS was analysed using ImageJ software. (C) Quantification of the total EPS

produced by A. tumefaciens strains in LB broth. The sulphate-anthrone method was

used. This experiment was performed three times. Vertical bars indicate the standard

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error for three independent experiments. An asterisk denotes a significant difference

from C58 C1/vec in a t-test (* < 0.05 ) (D). Biofilm produced by bacterial strains

using a crystal violet staining method. Vertical bars indicate the standard error for

three independent experiments. An asterisk denotes a significant difference from

C58C1/vec in a t-test (* < 0.05 ).

Fig. 5. Sensitivity of A. tumefaciens strain to oxidants. A. tumefaciens strains were

cultured to OD600 = 0.5, diluted and spot inoculated onto LB medium containing either

10 mM H2O2 or 10 mM SNP. The experiment was performed three times.

Fig. 6. Sensitivity of the A. tumefaciens strain to Dipy. (A) Effect of the addition of

metal ions to growth in the presence of Dipy. Cells were diluted and spotted onto TY

agar plates containing 0.2 mM Dipy and 0.1 mM FeCl3 and then incubated at 28°C for

4 d. Cells spotted onto an TY agar plate (TY) were used as a control. (B) Cells were

grown in TY medium, TY medium containing 0.1 mM Dipy and TY medium

containing 0.1 mM Dipy and 0.1 mM FeCl3. Growth was monitored by measuring the

OD600 after incubation at 28°C with shaking for 36 h. Vertical bars indicate the

standard error for three independent experiments. An asterisk denotes a significant

difference from C58C1/vec in a t-test (* < 0.05 ).

Fig. 7. Transient transformation of tobacco leaves mediated by A. tumefaciens

strains. (A) Transient transformation of tobacco leaf cells by A. tumefaciens. Over 20

tobacco leaves were infiltrated with A. tumefaciens carrying pCAMBIA2301

construct. Bars, 1 mm. (B) and (C) Superoxide anion radical accumulation in tobacco

leaves stained with NBT after infiltration of H2O and suspensions of A. tumefaciens

cells, respectively, “ –” denotes an untreated leaf. These experiments were performed

three times. Over 20 tobacco leaves were infiltrated with A. tumefaciens strains. Bars,

1 mm. (D) Bacterial populations from infiltrated tobacco leaves. Vertical bars indicate

the standard error for three independent experiments. An asterisk denotes a significant

difference from C58C1 in a t-test (* < 0.05).

Fig. 8. Differential gene expression in the A. tumefaciens lsrB deletion mutant. A.

tumefaciens strains were cultured to OD600 = 0.5, and total RNA was extracted for

RNA-Seq and RT-qPCR. RNA-Seq was performed at Shanghai BoHao Corporation,

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Shanghai. Transcript levels of indicated genes were determined by RT-qPCR. Vertical

bars indicate the standard error for three independent experiments. The relative

amount of mRNA for each gene was calculated using the threshold cycle (∆Ct)

method, normalized to the ropD gene.

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225x205mm (96 x 96 DPI)

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254x220mm (96 x 96 DPI)

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Page 32: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

The LsrB protein is required for Agrobacterium tumefaciens

interaction with host plants

Guirong Tang1, 2, Qiong Li1, Shenghui Xing1, Ningning Li1, Zheng Tang1,

Liangliang Yu1, Junhui Yan1, Xuan Li3, Li Luo1

1Shanghai Key Laboratory of Bio-energy Crops, Center of Plant Science, School of

Life Sciences, Shanghai University, Shanghai 200444, China; 2School of

Communication & Information Engineering, Shanghai University, Shanghai 200444,

China; 3Key Laboratory of Synthetic Biology, Institute of Plant Physiology and Ecology,

Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai

200032, China

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Page 33: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

BrLsrB --MVAPLDWDKLRIFHAAAEAGSFTHAAQTLHLSQSAISRQVSALEQDVGVPLFHRHARG

SmLsrB MGDSMSLDWDKLRIFHAAAEAGSFTHAADKLHLSQSAISRQVSSLEQDVGIKLFHRHARG

AtLsrB --MAMPLDWDKLRIFHAAAEAGSFTHAADKLHLSQSAISRQVSALEQDVGVKLFHRHARG

**********************:.*************:******: ********

BrLsrB LILTEQGETLYRTAHDVLMKLENVRSKLAESREKPSGRLRVTTTVGLGSGWLIERIQEFV

SmLsrB LILTEQGEMLYRTAHDVLMKLESVKAQLSETTDKPSGKLRITTTVGLGQGWLTDKIQEFM

AtLsrB LILTEQGELLYRTAHDVLLKLETVKMQLTETTEKPSGKLRVTTTVGLGQGWLTDKVQEFL

******** *********:***.*: :*:*: :****:**:*******.*** :::***:

BrLsrB ELYPDVQLQLILDNEELDLTMRHADCAVRLRQPQQPDLIQRRLFIVHMHVYASAGYVSKY

SmLsrB SLYPEIQVQLILDNEELDVNMRHADCAIRLRQPQQSDLIQRKLFTVHMHVYAAPSYINKY

AtLsrB QLYPEMSIQLILDNEELDVNMRHADCAIRLRQPQQSDLIQRKLFTVHMHVYAAPSYINRH

.***::.:**********:.*******:******* *****:** *******: .*:.::

BrLsrB GKLNSIDEIDQHRIVTFGEPAPSYLTGLNWLETAGRPDGSARIPALQVNNLLSVRRAVQR

SmLsrB GEPQSLDDLDNHRIITFGEPAPNYLLDVNWLEIAGRDSDNPRISHLQINSQTSIKRACLL

AtLsrB GEPQSVEDLDNHRIISFGEPAPNYLLDVNWLENAGRSSDNTRIPHLQINSQTSIKRACLL

*: :*::::*:***::******.** .:**** *** ... ** **:*. *::**

BrLsrB GVGIAVLPDYMADKESGLVQLLPELEEIPSFDTFFCYPEALKNSAKLHAFRDFLFSKARN

SmLsrB GIGIAMLPDYIVGRDPGLIQL-PISADIPSFDTYFCYPDELKNAAKLKVFRDYIVAKARN

AtLsrB GIGIACLPDYIVGRDPGLIQL-SLAADIPSFDTYFCYPDEMKNAAKLKAFRDFIVAKARN

*:*** ****:..:: **:** :******:****: :**:***:.***::.:****

BrLsrB WTY

SmLsrB WNF

AtLsrB WNF

*.:

Fig. S1 Alignment of predicted LsrB proteins from Sinorhizobium meliloti,

Agrobacter tumefaciens and Brucella abortus. The amino acid sequences of LsrB

were available from NCBI. The CLUSTAL O was used for sequence alignment. The

DNA binding domains are shown as red parts.

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Page 34: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

Fig. S2 Growth of A. tumefaciens lsrB mutants. Bacteria were cultured in LB/MC

medium. Cells in the exponential growth phase were diluted in fresh medium to

OD600=0.03. Cell density (optical density at 600 nm [OD600]) was monitored over time.

The figure shows the results of a typical experiment, which was performed three times.

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Fig. S3 Bacterial populations from infiltrated tobacco leaves. Vertical bars indicate the

standard error for three independent experiments. An asterisk denotes a significant

difference from C58C1 in a t-test (* < 0.05).

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Page 36: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

Fig. S4 Location of lsrB and lrp3 genes in the genome of A. tumefaciens and S.

meliloti. The TN11A boxes recognized by LsrB were predicted in the promoter regions

of lrp3 genes.

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Table S1 Strains and plasmids

Strain or plasmid Relevant properties Reference/source

E.coli strains

DH5α F- supE44 ΔlacU169 (φ80lacZΔM15) hsdR17 (rK - mK

+ ) recA1 endA1

gyrA96 thi-1 relA1

TaKaRa Corp.

MT616 pro-82 thi-1 hsdR17 supE44 recA56(pRK600); CmR (Finan et al., 1984)

DA1 DH5α carring pA1 ; KmR This study

A.tumefaciens strains

C58C1 Agrobacterium rhizogens (StrR, RifR) pRiA4b (Jelenic et al., 2000)

∆lsrBat/ plsrBat ∆lsrBat carrying pSRK carrying A.tumefaciens strains C58C1 lsrB;

GmR

This study

∆lsrBat / plsrBsm ∆lsrBat carrying pSRK carrying S. meliloti 1021 lsrB; GmR This study

∆lsrBat / plsrBba ∆lsrBat carrying pSRK carrying B.abortus2308 lsrB; GmR This study

Plasmids

pK18mobsacB A suicide vector containing sacB; KmR (Schafer et al., 1994)

pA1 pK18mobsacB carrying lsrBat frank fragment ; KmR This study

plsrBsm pSRK carrying S. meliloti 1021 lsrB; GmR This study

plsrBba

plsrBat

pSRK

pHC60

pCAMBIA2301

pSRK carrying B.abortus 2308 lsrB; GmR

pSRK carrying A.tumefaciens C58C1 lsrB; GmR

Expressing vector under control of lac promoter; GmR

constitutive GFP construct

carrying a CAMV-35S driven-GUS gene

This study

This study

(Khan et al., 2008)

(Cheng and Walker,

1998)

(Cambia, Canberra,

Australia)

Reference

Cheng, H.P., and Walker, G.C. (1998) Succinoglycan is required for initiation and

elongation of infection threads during nodulation of alfalfa by Rhizobium meliloti. J

Bacteriol. 180: 5183-5191.

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Page 38: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

Finan, T.M., Hartweig, E., LeMieux, K., Bergman, K., Walker, G.C., and Signer, E.R.

(1984) General transduction in Rhizobium meliloti. J Bacteriol 159: 120-124.

Jelenic, S., Mitrikeski, P.T., Papes, D., and Jelaska, S. (2000) Agrobacterium -

mediated transformation of broad bean Vicia faba L. Food Technol Biotech. 38: 167-

172.

Khan, S.R., Gaines, J., Roop, R.M., 2nd, and Farrand, S.K. (2008) Broad-host-range

expression vectors with tightly regulated promoters and their use to examine the

influence of TraR and TraM expression on Ti plasmid quorum sensing. Appl Environ

Microbiol 74: 5053-5062.

Schafer, A., Tauch, A., Jager, W., Kalinowski, J., Thierbach, G., and Puhler, A.

(1994) Small mobilizable multi-purpose cloning vectors derived from the Escherichia

coli plasmids pK18 and pK19: selection of defined deletions in the chromosome of

Corynebacterium glutamicum. Gene 145: 69-73.

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Page 39: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

Table S2 Primers

Primers Sequence (5’ to 3’) Purpose

P1 GCTCTAGAGCTCACCGAAGTTGAGACCAA construction of pA1

P2 ATCTCGTCGGGATAGCAGAGCAGTTTATCCCAGTCCAA construction of pA1

P3 TCTGCTATCCCGACGAGAT construction of pA1

P4 CCCAAGCTTGGGATAATGGCGGAAGGCATC construction of pA1

P5 ACGAGCGACGAAGAGTCAT identify of ∆lsrBat

P6 CGGTGGATTATCTCAAGCG identify of ∆lsrBat

P7 GGGGTACCCACCGAAGTTGAAACGACT construction of plsrBba

P8 GCTCTAGACGTCAATAGGTCCAATTGCG construction of plsrBba

P9 GGGGTACCCC AAATCGTCAGCGACCTCGT construction of plsrBat

P10 GCTCTAGAGCCGTCAGAAGTTCCAGTTCCG construction of plsrBat

P11 GGGGTACCCCCGTGACCGACGACATTCAT construction of plsrBsm

P12 GCTCTAGATCAGAAGTTCCAGTTTCTC construction of plsrBsm

P13 AGACCATTTCCGCACATTG qRT-PCR of fecB

P14 TTGAAGACCGTGTTGTCGTTAG qRT-PCR of fecB

P15 CTTTCTGACCGCATTTGG qRT-PCR of fecD

P16 GCACGAGATTGACCTTCTGT qRT-PCR of fecD

P17 AACTGGCGGAAGGTGACAT qRT-PCR of gshA

P18 TTACCGAGGGCAAGCCTAA qRT-PCR of gshA

P29 CATCGCCGAAGAAGACAA qRT-PCR of katA

P20 CGAAGACATCAGAGAAATGGTC qRT-PCR of katA

P23 ACAAGAACGGCAACAAGG qRT-PCR of exoR

P24 CGGTAATAATCGGCAAGG qRT-PCR of exoR

P25 ATGCACAATGGATCAACG qRT-PCR of attD

P26 ACTGCACAATGACGGGTT qRT-PCR of attD

P27 ACCATTGCCGACACCTACA

qRT-PCR of ropD

P28 TTCAGCGACAGCGACTTGA qRT-PCR of ropD

P29 GCCCACCAGATTGAAATACT qRT-PCR of fecE

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P30

P31

P32

P32

P34

P35

P36

P37

P38

P39

P40

P41

P42

P43

P44

P45

P46

P47

P48

GTTGACGCCAAAGACATCA

TCCAGAATACCGAAGACCTG

TTTCCACCGTGAACGAAC

TTCACGCTGCATTATCCC

ACCGTCAAACTGGGCTTT

AGCGGTTATGGTTATGGC

ACCTTTGAAGTCTGGCATCT

CAGTCTGTCAGCAAGAACCAG

ATCGGCAACGGAAATCAG

CGAAGCCTGCGATTACAT

TGTCGGTCTTGTTGAGCA

CCGAAGCAAACAGGGAAT

TTCATTTCACGCCAGACC

GAGCAAGGAAACCAATCTCA

ATGAAGAACCGCACATCG

GCTGGCAAGGTCAAAGTT

CTTCGCCACCCTTGAATA

TGGAAGAAGTGCCGCTAT

AACTGCCTTCCATCAGCA

qRT-PCR of fecE

qRT-PCR of Atu3676

qRT-PCR of Atu3676

qRT-PCR of Atu3679

qRT-PCR of Atu3679

qRT-PCR of exoV

qRT-PCR of exoV

qRT-PCR of exoC

qRT-PCR of exoC

qRT-PCR of exoP

qRT-PCR of exoP

qRT-PCR of Atu3680

qRT-PCR of Atu3680

qRT-PCR of gshB

qRT-PCR of gshB

qRT-PCR of trxA

qRT-PCR of trxA

qRT-PCR of oxyR

qRT-PCR of oxyR

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Table S3 Gene differential expression in the lsrB deletion mutant

gene id gene

name description

mutant/wt

Change fold

(log2)

P value

1132315 - hypothetical_protein -7.78836993 0

1133705 - hypothetical_protein -7.59033078 0

1133069 - hypothetical_protein -6.15964948 0

1139135 - hypothetical_protein -5.08156645 0

1134968 scrK fructokinase -4.90097779 0

1134969 agaZ tagatose_6_phosphate_kinase -4.82562762 0

1134966 - sorbitol_dehydrogenase -4.66561167 0

1134965 - zinc_binding_dehydrogenase -4.32933555 0

1135735 - acyl_CoA_hydrolase -4.28343574 3.8853E-269

1136415 pcaC carboxymuconolactone_decarboxylase -4.22011601 6.87849E-79

1136594 dppB dipeptide_ABC_transporter_permease -4.17502511 7.8873E-179

1134967 - sorbitol_mannitol_ABC_transporter_substrate_binding_protein -4.06906458 0

1136595 dppC dipeptide_ABC_transporter_permease -4.03868529 2.3658E-154

1136422 pcaJ 3_oxoadipate_CoA_transferase_subunit_B -3.98938885 1.2531E-135

1136421 pcaI 3_oxoadipate_CoA_transferase_subunit_A -3.85514944 2.31331E-94

1137500 virB11 type_IV_secretion_system_protein_VirB11 -3.82461734 0.003513922

1136596 ggt gamma_glutamyltranspeptidase -3.697382 4.94222462277237e-

317

1134972 - sorbitol_mannitol_ABC_transporter_ATPase -3.6283131 0

1136423 pcaF beta_ketoadipyl_CoA_thiolase -3.51043545 3.9565E-182

1133070 - hypothetical_protein -3.46447239 0

1136593 dppA dipeptide_ABC_transporter_substrate_binding_protein -3.29517148 3.3206E-242

1136592 - GntR_family_transcriptional_regulator -3.22545492 1.12533E-52

1136416 pcaD beta_ketoadipate_enol_lactone_hydrolase -3.21632437 2.89927E-52

1134224 - transcriptional_regulator%2C_LysR_family -3.1874254 0

1134971 - sorbitol_mannitol_ABC_transporter_permease -2.9799745 1.1644E-223

1134970 - sorbitol_mannitol_ABC_transporter_permease -2.91080598 2.1841E-226

1135918 - glycine_betaine_ABC_transporter_ATPase -2.90456326 4.6379E-297

1136597 - ABC_transporter_permease -2.8806064 2.456E-246

1133802 metF methylenetetrahydrofolate_reductase -2.73893103 5.5721E-256

1134553 dppD ABC_transporter%2C_nucleotide_binding_ATPase_protein_dipeptide_ -2.73407391 2.7125E-153

1135697 metE 5_methyltetrahydropteroyltriglutamate_homocysteine_S_methyltransferase -2.6952744 1.8015E-285

1133123 slyA transcriptional_regulator%2C_MarR_family -2.59373547 6.97114E-81

1136389 livF branched_chain_amino_acid_ABC_transporter_ATPase -2.556168 4.0773E-107

1136896 atrC acetolactate_synthase_catalytic_subunit -2.5285444 1.5997E-257

1136897 atrB glutamate_1_semialdehyde_aminotransferase -2.50879528 3.0299E-241

1132764 - ring_hydroxylating_dioxygenase%2C_alpha_subunit -2.50575923 2.5759E-270

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Page 42: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1133670 - dimethylglycine_dehydrogenase -2.5045827 1.1754E-270

1134180 glnA glutamine_synthetase -2.48454783 1.0528E-182

1134554 dppC ABC_transporter%2C_membrane_spanning_protein_dipeptide_ -2.48239288 6.5038E-140

1134551 - penicillin_binding_protein -2.45473202 7.0796E-109

1136412 pcaB 3_carboxy_cis%2Ccis_muconate_cycloisomerase -2.44415127 4.1854E-135

1135883 tnp IS3_family_transposase -2.44070213 0.000595325

1132993 - hypothetical_protein -2.37025666 5.82546E-13

1136414 pcaH protocatechuate_3%2C4_dioxygenase_subunit_beta -2.36252019 1.4859E-127

1134552 dppF ABC_transporter%2C_nucleotide_binding_ATPase_protein_dipeptide_ -2.35762433 3.0215E-104

1136390 livG branched_chain_amino_acid_ABC_transporter_ATPase -2.34103367 2.43855E-80

1135698 - hypothetical_protein -2.33450449 3.2714E-198

1135943 soxA sarcosine_oxidase_alpha_subunit -2.32652645 1.6854E-228

1135944 soxG sarcosine_oxidase_gamma_subunit -2.31622832 1.2368E-187

1137288 - hypothetical_protein -2.29542076 9.15534E-33

1136413 pcaG protocatechuate_3%2C4_dioxygenase_alpha_chain -2.28466748 1.9851E-107

1134556 dppA ABC_transporter%2C_substrate_binding_protein_dipeptide_ -2.27543127 1.1697E-209

1134548 - aminopeptidase -2.2457405 8.283E-135

1132483 - hypothetical_protein -2.20057482 1.31933E-17

1136902 attC ABC_transporter_substrate_binding_protein_mannopine_ -2.19678281 6.1174E-174

1137497 virB8 type_IV_secretion_system_protein_VirB8 -2.17776098 0.001546551

1132765 - ferredoxin_I -2.14059824 8.4603E-195

1134974 - sugar_ABC_transporter_permease -2.12578172 5.09486E-49

1136058 - - -2.12304152 2.39193E-66

1136895 fabG 3_ketoacyl_ACP_reductase -2.11876152 9.3269E-129

1136894 - two_component_response_regulator -2.11490445 1.65068E-74

1136903 attD attachment_protein -2.10441154 1.64917E-56

1136583 fdsD NAD_dependent_formate_dehydrogenase_subunit_delta -2.09702018 4.53876E-96

1134555 dppB ABC_transporter%2C_membrane_spanning_protein_dipeptide_ -2.05033517 2.7618E-135

1137499 virB10 type_IV_secretion_system_protein_VirB10 -2.04638992 7.83555E-05

1132103 frcA ABC_transporter%2C_nucleotide_binding_ATPase_protein_sugar_ -2.04229486 5.5793E-181

1132484 - hypothetical_protein -2.03259189 2.00847E-21

1132994 gp35 phage_prohead_protease -1.99391887 7.83273E-12

1132104 - putative_kinase -1.97833913 1.6306E-155

1135920 - glycine_betaine_ABC_transporter_substrate_binding_protein -1.94043105 4.4122E-161

1135919 - glycine_betaine_ABC_transporter_permease -1.92650647 4.5429E-134

1134973 - sugar_ABC_transporter_ATPase -1.90913111 4.20207E-65

1136184 soxB sarcosine_oxidase_beta_subunit -1.90121826 1.43837E-69

1132867 betB betaine_aldehyde_dehydrogenase -1.88342844 6.73053E-81

1135359 - short_chain_dehydrogenase -1.87601489 3.12572E-89

1132868 betA choline_dehydrogenase -1.86852138 3.93781E-63

1134061 ndh NADH_dehydrogenase -1.86317315 1.0512E-122

1132866 betI transcriptional_regulator_BetI -1.86235001 9.03215E-26

1135358 - hypothetical_protein -1.85258879 1.23641E-73

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Page 43: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1136391 livM branched_chain_amino_acid_ABC_transporter_permease -1.82571018 3.08579E-52

1135767 - sugarl_ABC_transporter_permease -1.80590922 2.62867E-42

1132632 aglA alpha_glucosidase -1.79010837 1.3245E-142

1132500 - endolysin -1.77633566 9.30458E-57

1132633 aglK ABC_transporter%2C_nucleotide_binding_ATPase_protein -1.76499557 1.2686E-138

1132502 - hypothetical_protein -1.74698297 7.14271E-24

1135667 aspA aspartate_ammonia_lyase -1.74633339 8.79235E-51

1137289 - hypothetical_protein -1.74329647 8.33975E-80

1136901 attB ABC_transporter_membrane_spanning_protein_mannopine_ -1.74275 1.82072E-76

1136185 soxD sarcosine_oxidase_delta_subunit -1.7187827 5.31697E-23

1135768 - sugar_ABC_transporter_permease -1.70676402 4.83284E-36

1134182 - hypothetical_protein -1.70439161 2.812E-40

1134502 purU formyltetrahydrofolate_deformylase -1.67733192 4.879E-114

1136582 fdhF formate_dehydrogenase_alpha_subunit -1.67678739 3.2402E-116

1136666 - hypothetical_protein -1.66968974 3.42048E-06

1135561 - TonB_dependent_receptor -1.66538822 2.3806E-103

1137958 - hypothetical_protein -1.65986795 1.4323E-07

1136186 soxA sarcosine_oxidase_alpha_subunit -1.65225556 1.46521E-88

1135885 - hypothetical_protein -1.64205033 3.24789E-38

1134188 - ABC_transporter%2C_nucleotide_binding_ATPase_protein -1.64089172 5.37668E-87

1134181 - ABC_transporter%2C_membrane_spanning_protein_amino_acid_ -1.6358321 4.99528E-60

1136899 attA1 ABC_transporter_nucleotide_binding_ATPase_putrescine_ -1.63465103 4.97092E-88

1135365 - hypothetical_protein -1.63311097 2.44066E-15

1136584 - MFS_permease -1.62076846 1.7353E-101

1134975 - sugar_ABC_transporter_permease -1.61974397 2.49763E-31

1135942 soxD sarcosine_oxidase_delta_subunit -1.61921802 8.63007E-71

1132995 gp36 phage_phi_C31_major_capsid_gp36_like_protein -1.61064832 3.161E-38

1136900 attA2 ABC_transporter_membrane_spanning_protein_mannopine_ -1.60944414 6.70496E-79

1133004 - hypothetical_protein -1.60160353 5.43429E-09

1133605 fdhA glutathione_independent_formaldehyde_dehydrogenase -1.59821899 4.4023E-110

1133002 - hypothetical_protein -1.59346854 1.24087E-14

1132802 - hypothetical_protein -1.58568523 2.20962E-94

1134964 - LacI_family_transcriptional_regulator -1.57691751 1.19907E-83

1136985 - hypothetical_protein -1.57253765 4.50621E-38

1135941 - hypothetical_protein -1.568207 1.57548E-78

1137970 - hypothetical_protein -1.56550462 2.66714E-79

1132499 - hypothetical_protein -1.55908685 2.5699E-48

1135562 fecB iron_III_ABC_transporter_permease_dicitrate_ABC_transporter_permease -1.55362373 1.72074E-54

1135565 fecE iron_III_dicitrate_ABC_transporter_ATPase -1.55131628 3.18756E-26

1135947 glgX glycogen_debranching_protein -1.54573059 6.22794E-85

1132631 aglG ABC_transporter%2C_membrane_spanning_protein -1.53629522 2.3942E-103

1136910 blcA NAD_dependent_succinyl_semialdehyde_dehydrogenase -1.52454302 2.28979E-57

1138472 - hypothetical_protein -1.5162651 1.28803E-42

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Page 44: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1135924 exoN UTP_glucose_1_phosphate_uridylyltransferase -1.5158058 1.56292E-98

1132766 - hypothetical_protein -1.50878312 6.47472E-56

1136189 purU formyltetrahydrofolate_deformylase -1.50815479 6.63079E-28

1133805 - transcriptional_regulator%2C_AraC_family -1.50368363 1.19469E-93

1133447 allA ureidoglycolate_hydrolase -1.49926947 1.04267E-13

1136418 pobA 4_hydroxybenzoate_3_monooxygenase -1.49797762 1.83517E-26

1134123 lpxC UDP_3_0_3_hydroxymyristoyl_N_acetylglucosamine_deacetylase -1.49224529 2.40576E-83

1136893 - hypothetical_protein -1.48414311 2.10793E-05

1136187 soxG sarcosine_oxidase_gamma_subunit -1.47283421 2.03491E-26

1132801 - hydrolase -1.47082915 4.0974E-75

1137969 - putative_phage_tail_protein_I -1.46703397 2.48884E-29

1135940 soxB sarcosine_oxidase_beta_subunit -1.45039662 3.04408E-87

1132492 - hypothetical_protein -1.44225099 7.44952E-27

1135769 - sugar_ABC_transporter_ATPase -1.4392144 6.09735E-25

1132482 - hypothetical_protein -1.43834167 4.35522E-05

1132932 - ABC_transporter%2C_membrane_spanning_protein -1.43163834 0.000547753

1137963 - hypothetical_protein -1.42789553 1.07785E-29

1136614 - zinc_binding_dehydrogenase -1.4223455 4.49176E-19

1132506 - hypothetical_protein -1.41728873 1.17844E-50

1135541 panD aspartate_alpha_decarboxylase -1.4120448 3.11845E-23

1137449 traC conjugal_transfer_protein_TraC -1.40504158 1.26288E-06

1132997 - hypothetical_protein -1.39949776 1.59941E-05

1137756 - hypothetical_protein -1.39858357 9.97688E-64

1134525 pdxK pyridoxamine_kinase -1.39313489 1.12907E-65

1133124 - MFS_permease -1.39291231 1.58621E-37

1135948 exoC phosphoglucomutase -1.38564463 1.29932E-81

1137973 - putative_bacteriophage_P2_tail_protein -1.38447075 2.63194E-21

1132495 - hypothetical_protein -1.38415034 9.91509E-55

1134383 gguC hypothetical_protein -1.38368142 1.37294E-80

1137946 - hypothetical_protein -1.38213962 1.62594E-20

1135772 glpR DeoR_family_transcriptional_regulator -1.37282902 9.27793E-27

1133445 - gluconate_dehydrogenase -1.37028106 5.36241E-36

1136841 - ABC_transporter_nucleotide_binding_ATPase_oligopeptide_ -1.36804827 2.15137E-41

1135366 - sugar_kinase -1.3593303 1.39033E-28

1134179 - hypothetical_protein -1.35323732 4.29407E-58

1134178 - hypothetical_protein -1.35170011 1.59734E-47

1135701 - LysR_family_transcriptional_regulator -1.34843307 2.04876E-55

1133496 mvrA ferredoxin_NADP+_reductase -1.34501453 1.93538E-70

1133003 - hypothetical_protein -1.34383749 5.00414E-16

1133446 gutB sorbitol_dehydrogenase -1.34103535 6.19463E-25

1135766 - hypothetical_protein -1.34012556 3.34013E-08

1137950 - hypothetical_protein -1.33972698 3.1997E-10

1132630 aglF ABC_transporter%2C_membrane_spanning_protein -1.33522008 6.64794E-78

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Page 45: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1135923 exoP exopolysaccharide_polymerization_transport_protein -1.33178598 3.60061E-76

1136826 - hypothetical_protein -1.32901695 1.01342E-11

1136236 - hypothetical_protein -1.3284458 4.39335E-26

1136232 - ABC_transporter_permease -1.31860459 5.63567E-25

1132491 - hypothetical_protein -1.3163302 2.19225E-31

1135564 fecD iron_III_ABC_transporter_permease_dicitrate_ABC_transporter_permease -1.31620349 6.53524E-18

1135950 glgC glucose_1_phosphate_adenylyltransferase -1.30531202 1.83859E-69

1136382 - oxoreductase -1.30477837 7.69738E-49

1136278 - hypothetical_protein -1.30236041 3.58145E-09

1133797 sdaA L_serine_dehydratase -1.30201465 4.0133E-72

1137964 - hypothetical_protein -1.29648872 1.72053E-25

1132487 - hypothetical_protein -1.2952575 4.55555E-15

1136420 pcaR IclR_family_transcriptional_regulator -1.29417446 2.21141E-15

1136939 avhB5 type_IV_secretion_protein_AvhB5 -1.29270779 1.53935E-26

1137234 - ABC_transporter_membrane_spanning_protein -1.29264089 3.86236E-25

1137272 - oxidoreductase -1.29171871 7.87108E-13

1136883 traC conjugal_transfer_protein -1.291508 1.04716E-06

1134976 - sugar_ABC_transporter_substrate_binding_protein -1.29034965 6.00906E-53

1136840 dapA dihydrodipicolinate_synthase -1.28790378 5.67758E-35

1136392 livH branched_chain_amino_acid_ABC_transporter_permease -1.28698975 2.61664E-35

1132073 pckA phosphoenolpyruvate_carboxykinase -1.28631229 4.43621E-62

1138454 - hypothetical_protein -1.28192763 4.89949E-12

1134187 - ABC_transporter%2C_membrane_spanning_protein -1.28024682 2.57381E-39

1137366 repA plasmid_partitioning_protein_RepA -1.27857546 0.005137498

1136938 avhB4 type_IV_secretion_protein_AvhB4 -1.2751934 5.75068E-43

1134183 - transcriptional_regulator%2C_RpiR_family -1.2720662 5.87477E-31

1132989 - large_terminase_phage_packaging_protein -1.26890979 4.2871E-20

1132992 gp34 phage_head_portal_protein -1.26535183 4.3801E-15

1136383 iolB hypothetical_protein -1.26005091 7.58523E-53

1136825 hspAT1 small_heat_shock_protein -1.25412206 2.92351E-24

1132485 - hypothetical_protein -1.25210111 2.26664E-06

1136188 glyA serine_hydroxymethyltransferase -1.25168693 4.94496E-44

1133565 fixS nitrogen_fixation_protein_FixS -1.24742775 1.38086E-33

1132534 - hypothetical_protein -1.24482011 2.783E-30

1135540 - hypothetical_protein -1.23664575 4.34943E-22

1137235 - ABC_transporter_nucleotide_binding_ATPase -1.23301341 5.49332E-29

1135743 - ABC_transporter_permease -1.23262632 9.25581E-60

1133467 pdhA pyruvate_dehydrogenase_alpha_subunit -1.23183132 1.25939E-66

1137951 - hypothetical_protein -1.22983736 1.98794E-18

1136360 - nitroreductase -1.22390927 6.39583E-34

1133669 rrpX two_component_response_regulator -1.22379276 7.04185E-47

1135550 Atu3676 siderophore_biosynthesis_protein -1.22089922 3.81454E-08

1134777 - oxidoreductase -1.2165309 3.83002E-22

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Page 46: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1137270 - hypothetical_protein -1.21207102 3.38431E-10

1133030 - permease -1.21155448 1.38197E-13

1134634 - beta_N_acetylhexosaminidase -1.21150294 7.27789E-52

1138452 - hypothetical_protein -1.18971645 1.97125E-10

1137273 - dehydrogenase -1.18636849 3.68278E-28

1132933 - ABC_transporter%2C_substrate_binding_protein -1.18407438 1.1289E-09

1135553 Atu3679 siderophore_biosynthesis_protein -1.18246507 1.4882E-06

1136564 - amino_acid_ABC_transporter_ATPase_permease -1.17650445 2.88286E-28

1133617 - ABC_transporter%2C_membrane_spanning_protein_amino_acid_ -1.17531919 3.92743E-58

1139497 - hypothetical_protein -1.17181624 1.38609E-56

1133473 - hypothetical_protein -1.17114156 1.04358E-47

1135005 - RND_multidrug_efflux_membrane_permease -1.16897858 2.94744E-30

1136524 - sugar_ABC_transporter_ATPase -1.16291872 5.01154E-28

1135949 glgA glycogen_synthase -1.16019481 9.42834E-54

1136911 blcB gamma_hydroxybutyrate_dehydrogenase -1.15969417 2.09551E-34

1136723 - NADP_dependent_aldehyde_dehydrogenase -1.15933732 6.84326E-50

1134549 dat D_alanine_aminotransferase -1.15847611 8.75046E-39

1134176 - dehydrogenase -1.15643601 2.57445E-54

1136937 avhB3 type_IV_secretion_protein_AvhB3 -1.1526202 1.05177E-12

1136722 deoC 2_deoxyribose_5_phosphate_aldolase -1.15172615 1.18997E-38

1136941 avhB7 type_IV_secretion_protein_AvhB7 -1.14852095 8.30139E-07

1135363 - ABC_transporter_permease -1.14732163 1.48768E-17

1135554 Atu3680 siderophore_biosynthesis_protein -1.14593126 0.000379359

1135563 fecC iron_III_ABC_transporter_permease_dicitrate_ABC_transporter_permease -1.14394468 5.34493E-16

1135688 - hypothetical_protein -1.14118846 8.35863E-06

1132629 aglE ABC_transporter%2C_substrate_binding_protein_alpha_glucoside_ -1.1342628 2.00748E-57

1136003 mmsB 3_hydroxyisobutyrate_dehydrogenase -1.1299013 1.04029E-19

1136537 - oligopeptide_ABC_transporter_permease -1.12792667 3.16187E-29

1135091 aspC aspartate_aminotransferase -1.12549699 2.51357E-21

1136630 - hypothetical_protein -1.12430697 2.63432E-15

1136525 argH argininosuccinate_lyase -1.12319698 7.94902E-28

1134983 - hypothetical_protein -1.12166858 0.001425402

1134287 - hypothetical_protein -1.11769511 3.60598E-28

1135770 - sugar_ABC_transporter_ATPase -1.11695295 1.24816E-14

1134716 ligT 2_5_RNA_ligase -1.11509824 1.46421E-49

1132511 - hypothetical_protein -1.11494739 2.03273E-12

1135967 - hypothetical_protein -1.111456 2.91893E-29

1135552 Atu3678 siderophore_biosynthesis_protein -1.11071039 0.000144725

1135201 exoY succinoglycan_exopolysaccharide_synthesis_protein -1.10989497 3.96119E-52

1135004 - RND_multidrug_efflux_transporter -1.1051447 2.28077E-40

1136384 iolE hypothetical_protein -1.09964375 5.09681E-42

1134009 - hypothetical_protein -1.09424924 1.16024E-45

1135933 exoV succinoglycan_biosynthesis_protein -1.0880879 1.15341E-39

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Page 47: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1132486 - hypothetical_protein -1.0870508 0.017888366

1136943 avhB9 type_IV_secretion_protein_AvhB9 -1.08637926 2.73208E-14

1134177 - aldehyde_dehydrogenase -1.08598679 4.28646E-46

1134437 - hypothetical_protein -1.08126895 1.15042E-44

1140140 pycA pyruvate_carboxylase -1.07732537 1.13345E-50

1132488 nusG transcription_antitermination_protein -1.076038 2.46699E-08

1133572 fixP cytochrome_c_oxidase%2C_FixP_chain -1.07577354 2.18524E-49

1135736 - hypothetical_protein -1.0749841 2.00647E-22

1133443 - transcriptional_regulator%2C_GntR_family -1.07438286 4.05813E-34

1134635 - short_chain_dehydrogenase -1.07323507 1.59578E-25

5729694 - hypothetical_protein -1.07088319 1.13264E-35

1136944 avhB10 type_IV_secretion_protein_AvhB10 -1.06804906 1.30351E-19

1138468 - hypothetical_protein -1.06766535 1.8105E-08

1137231 - isomerase_lactonizing_enzyme -1.06645835 1.09722E-21

1136393 livJ branched_amino_acid_ABC_transporter_substrate_binding_protein -1.06293261 9.84163E-36

1136936 avhB2 type_IV_secretion_protein_AvhB2 -1.06282937 2.19485E-11

1135702 - acetyltransferase -1.06235437 2.81131E-24

1133618 - ABC_transporter%2C_nucleotide_binding_ATPase_protein_amino_acid_ -1.06182612 2.87663E-47

1137233 - ABC_transporter_membrane_spanning_protein -1.05477153 6.39188E-19

1136880 - hypothetical_protein -1.05346922 6.93329E-05

1135969 - hypothetical_protein -1.05148098 2.88405E-22

1132498 - hypothetical_protein -1.04311442 5.47423E-05

1135691 - dehydratase -1.04109584 2.5328E-15

1136005 - hydroxybutyrate_dehydrogenase -1.03906738 2.67309E-14

1136118 - polyamine_ABC_transporter_permease -1.03356812 1.80004E-07

1132650 - ABC_transporter%2C_membrane_spanning_protein -1.03219426 5.62992E-26

1136114 - alkanal_monooxygenase_subunit_alpha -1.03210872 2.01935E-12

1136882 traD conjugal_transfer_protein -1.03121922 0.001720061

1135549 - peptide_synthetase%2C_siderophore_biosynthesis_protein -1.02951634 5.71903E-16

1135216 thuA trehalose_utilization_like_protein -1.02934362 5.72771E-43

1137229 - hypothetical_protein -1.0249852 5.36614E-17

1134633 - hypothetical_protein -1.02381235 1.39607E-34

1132102 frcC ABC_transporter%2C_membrane_spanning_protein_sugar_ -1.02377531 7.665E-46

1134774 ilvD dihydroxy_acid_dehydratase -1.02119187 2.21128E-26

1133472 lpdA dihydrolipoamide_dehydrogenase -1.01666482 1.2033E-43

1134175 - hypothetical_protein -1.01643 1.05775E-32

1136208 impJ hypothetical_protein -1.01620593 2.17112E-40

1135090 - oligopeptide_ABC_transporter_ATPase -1.01433479 1.09606E-06

1136604 - hypothetical_protein -1.01373878 8.95258E-06

1137271 - oxidoreductase_with_iron_sulfur_subunit -1.01163914 0.000644486

1135337 cpoF non_heme_chloroperoxidase -1.0107668 0.002245145

1136633 eutB threonine_dehydratase -1.00995016 1.31584E-07

1135200 exoF exopolysaccharide_production_protein -1.00871563 2.25017E-39

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Page 48: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1135215 thuK trehalose_maltose_ABC_transporter_ATPase -1.00635381 5.43746E-37

1136538 - oligopeptide_ABC_transporter_ATPase -1.00553412 2.53735E-30

1134896 mcpA methyl_accepting_chemotaxis_protein -1.00403787 2.831E-14

1135219 exsC 6_pyruvoyl_tetrahydrobiopterin_synthase -1.00260888 0.001457933

1135413 - hypothetical_protein -1.0022391 1.36705E-37

1134439 ureC urease_alpha_subunit -1.00160009 1.29037E-37

1133006 - hypothetical_protein -1.00042329 3.94988E-09

1135833 dhaL aldehyde_dehydrogenase -1.00031244 1.60272E-22

1134568 - oxidoreductase -1.01056915 5.47839E-09

1134371 - ATP_dependent_RNA_helicase 1.013705246 1.58513E-56

1136656 drrA two_component_response_regulator 1.032536482 1.67049E-36

1133500 gcvP glycine_cleavage_system_protein_P2 1.033741038 7.54667E-65

1134425 - NTP_pyrophosphohydrolase%2C_MutT_family 1.034719339 4.82761E-17

1136290 - phosphopantetheinyl_transferase 1.043450021 6.38702E-51

1134050 - ABC_transporter%2C_nucleotide_binding_ATPase_protein 1.0579565 7.33563E-05

1134423 amaB N_carbamoyl_beta_alanine_amidohydrolase 1.059826536 2.1631E-43

1134471 - hypothetical_protein 1.060540569 0.017288282

1132427 - - 1.064746856 4.27506E-13

1134565 - dioxygenase 1.071734803 1.71222E-06

1134106 - hypothetical_protein 1.072100393 5.2714E-37

1134426 - ABC_transporter%2C_nucleotide_binding_ATPase_protein_nitrate_ 1.073551288 2.33514E-24

1133755 fadL long_chain_fatty_acid_transport_protein 1.077526427 2.78574E-68

1134820 - acetyltransferase 1.077778581 1.31711E-53

1136024 - hypothetical_protein 1.078471698 5.30887E-37

1134937 - ABC_transporter_permease 1.082887735 1.59188E-15

1132543 - - 1.087830166 6.61109E-17

1133099 - hypothetical_protein 1.089220702 1.72595E-17

1135879 - - 1.099275763 1.20728E-08

1134950 - sugar_ABC_transporter_ATPase 1.102809053 2.10261E-18

1134424 dht dihydropyrimidinase 1.111738073 4.0744E-43

1135619 - FAD_binding_dehydrogenase 1.123212042 9.08813E-53

1133835 - - 1.129496549 9.93185E-09

1134949 - oxidoreductase 1.137909701 1.28387E-42

1135112 - sugar_ABC_transporter_permease 1.139913534 6.16285E-24

1133606 - transcriptional_regulator%2C_TetR_family 1.140413415 1.31436E-29

1134451 - ABC_transporter%2C_membrane_spanning_protein_urea_amide_ 1.143460598 0.000115277

1134534 - nitroreducatase 1.144430407 7.93655E-37

1135783 - hypothetical_protein 1.155340997 5.10517E-75

1136028 - aliphatic_sulfonate_ABC_transporter_substrate_binding_protein 1.155822605 3.45792E-20

1133621 - - 1.160365971 2.70464E-08

1136400 - ABC_transporter_permease 1.160965037 3.97535E-75

1135872 bioF 8_amino_7_oxononanoate_synthase 1.170115549 5.48999E-35

1136655 - two_component_sensor_kinase 1.170386966 1.53014E-38

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Page 49: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1133501 gcvH glycine_cleavage_system_component_H 1.173994553 1.12185E-68

1135347 bkdA1 2_oxoisovalerate_dehydrogenase_subunit_alpha 1.178147254 1.02606E-76

1135172 dctA C4_dicarboxylate_transporter_DctA 1.182580635 1.03711E-72

1135954 - glutamine_amidotransferase 1.183193994 1.01501E-40

1136295 - spermidine_putrescine_ABC_transporter_substrate_binding_protein 1.184188456 1.16287E-75

1135129 - dicarboxylate_ABC_transporter_permease 1.184920909 3.00314E-61

1134916 - sugar_ABC_transporter_substrate_binding_protein 1.185905855 3.54537E-52

1134262 aldA aldehyde_dehydrogenase 1.19648823 2.86052E-83

1134341 - hypothetical_protein 1.197805395 1.5434E-44

1132153 - hypothetical_protein 1.201528094 1.00586E-14

1132501 - hypothetical_protein 1.20574237 0.000914969

1135126 exuR GntR_family_transcriptional_regulator 1.209106849 4.83877E-33

1135351 acd acyl_CoA_dehydrogenase 1.210722394 5.35136E-78

1133024 - hypothetical_protein 1.214667461 0.000251116

1137257 - hypothetical_protein 1.217068797 8.66712E-73

1132066 - hypothetical_protein 1.218183039 2.67732E-09

1136299 iunH inosine_uridine_preferring_nucleoside_hydrolase 1.225343827 2.48424E-30

1136452 - ABC_transporter_permease 1.237930691 7.77898E-57

1136696 - acyl_CoA_synthetase 1.24542892 6.53728E-72

1134429 - ABC_transporter%2C_substrate_binding_protein_nitrate_sulfonate_taurine_bicarbonate_ 1.25120185 1.82699E-46

1136697 acaB acetyl_CoA_acetyltransferase 1.253172143 8.89726E-68

1132451 - stress_induced_protein 1.253997163 2.46233E-05

1132328 - rare_lipoprotein_A 1.256515934 1.49416E-49

1133303 - - 1.262153438 1.27851E-10

1132891 - hypothetical_protein 1.272918244 1.92047E-35

1132337 - hypothetical_protein 1.292821731 8.6763E-57

1136695 fabG 3_oxoacyl_ACP_reductase 1.29404792 6.31029E-56

1136694 - hypothetical_protein 1.298250872 2.64746E-49

1133593 - - 1.304968825 9.06443E-20

1134938 - ABC_transporter_permease 1.311164098 3.35027E-08

1132522 - two_component_response_regulator 1.312340127 7.04779E-81

1135077 - LacI_family_transcriptional_regulator 1.313256349 1.0029E-86

1135226 - sugar_ABC_transporter_substrate_binding_protein 1.3369134 6.69824E-79

1136059 - hypothetical_protein 1.337504513 2.13004E-81

1135240 - tripartite_ATP_independent_periplasmic_transporter_DctQ 1.339624179 1.51641E-54

1135574 - - 1.345928458 4.33951E-23

1135078 - ABC_transporter_permease 1.34981007 1.63321E-95

1132771 - enoyl_CoA_hydratase_isomerase 1.351071395 3.51722E-57

1134273 - hypothetical_protein 1.352464121 2.05712E-82

1135976 - - 1.353011049 2.92569E-29

1132196 - ABC_transporter%2C_membrane_spanning_protein 1.354516115 5.3486E-85

1137043 - permease_component_of_C4_dicarboxylate_transporter 1.370012785 4.0654E-100

1134987 ugpB glycerol_3_phosphate_ABC_transporter_substrate_binding_protein 1.380162044 1.0513E-88

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Page 50: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1134535 - hydrolase 1.384080745 2.59759E-65

1133231 - - 1.398366038 0.008189464

1135431 - hypothetical_protein 1.39838269 2.00436E-06

1135407 - sugar_ABC_transporter_substrate_binding_protein 1.398982826 6.7909E-72

1135818 - - 1.413047331 2.03868E-09

1136698 - IclR_family_transcriptional_regulator 1.418515094 1.41369E-65

1141089 - hypothetical_protein 1.422663447 7.57713E-97

1136297 - ABC_transporter_permease 1.423640425 8.36515E-39

1133623 - - 1.423909312 2.21234E-07

1135146 pssN exopolysaccharide_export_protein 1.428861112 2.32856E-45

1133259 - hypothetical_protein 1.453033113 3.92742E-60

1134577 - - 1.455638045 2.56101E-25

1136300 adeC adenine_deaminase 1.459903247 8.40018E-60

1136658 afuA ABC_transporter_substrate_binding_protein 1.470925571 5.86838E-45

1134536 - hypothetical_protein 1.478612962 5.40148E-53

1134272 - hypothetical_protein 1.486804266 7.8569E-101

1135020 - hypothetical_protein 1.497911703 0.003687528

1132098 - - 1.503478538 3.42845E-07

1136580 nuoE formate_dehydrogenase_subunit_gamma 1.527344469 1.53059E-92

1136701 - ABC_transporter_permease 1.528395791 4.9333E-107

1135882 - - 1.541486662 8.48069E-98

1134743 prsD1 ABC_transporter%2C_nucleotide_binding_ATPase_protein_protein_ 1.54583836 3.5178E-42

1135068 - peptide_ABC_transporter_ATPase 1.555717027 3.39171E-97

1136296 - spermidine_putrescine_ABC_transporter_permease 1.57109518 1.69181E-84

1134537 - Isochorismatase 1.579096898 1.42664E-85

1135167 dadA D_amino_acid_dehydrogenase_small_subunit 1.580557155 1.7791E-132

1135907 - sugar_ABC_transporter_substrate_binding_protein 1.593893868 1.3993E-141

1136066 - oligopeptide_ABC_transporter_substrate_binding_protein 1.59617217 3.7832E-113

1135348 mmgC acyl_CoA_dehydrogenase 1.62431202 1.4798E-137

1135881 arcA arginase 1.625550034 6.6512E-126

1136618 - sugar_ABC_transporter_substrate_binding_protein 1.633283722 4.9271E-81

1134150 slt soluble_lytic_transglycosylase 1.637524772 6.0681E-31

1135002 - ribose_ABC_transporter_ATPase 1.64186862 1.1506E-105

1132145 - hypothetical_protein 1.674921574 5.9525E-103

1134006 - hypothetical_protein 1.699616069 0.008583897

1136699 - dehydrogenase 1.711517521 7.521E-114

1135664 kdpA potassium_transporting_ATPase_subunit_A 1.725465725 2.31341E-38

1134109 - hypothetical_protein 1.742814111 1.03426E-19

1135580 serA D_3_phosphoglycerate_dehydrogenase 1.778877005 7.7274E-166

1134951 - sugar_ABC_transporter_permease 1.784809143 7.36705E-21

1135450 xylF xylose_ABC_transporter_substrate_binding_protein 1.790931796 2.1905E-133

1132539 acd acyl_CoA_dehydrogenase 1.793454494 2.3937E-168

1135755 - sugar_ABC_transporter_substrate_binding_protein 1.80599392 1.68203E-54

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Page 51: The LsrB protein is required for Agrobacterium tumefaciens ... · Moreover, expression of the lsrB gene from S. meliloti, Brucella abortus or A. tumefaciens rescued the defects observed

1135113 - sugar_ABC_transporter_substrate_binding_protein 1.854646318 8.144E-109

1133847 - - 1.862515666 1.10224E-10

1135096 - ribose_ABC_transporter_substrate_binding_protein 1.873456903 1.495E-96

1136700 - ABC_transporter_substrate_binding_protein 1.87613774 2.1554E-167

1135128 - dicarboxylate_ABC_transporter_ATPase 1.877391279 1.2892E-113

1134569 actI actinorhodin_polyketide_dimerase 1.886500763 4.20958E-10

1132453 - hypothetical_protein 1.892021094 3.4481E-177

1135000 - ribose_ABC_transporter_substrate_binding_protein 1.925809343 1.3723E-156

1134939 - C4_dicarboxylate_binding_protein 1.944721126 5.17386E-57

1136061 - - 1.987796709 2.40425E-85

1136657 afuA ABC_transporter_substrate_binding_protein 2.009418548 1.6686E-105

1132443 fadD long_chain_fatty_acid_CoA_ligase 2.024272727 4.6578E-208

1132452 - - 2.02860773 2.73303E-51

1135349 - acetyl_CoA_C_acetyltransferase 2.047819195 1.124E-211

1132770 mmgC acyl_CoA_dehydrogenase 2.12685267 1.6647E-212

1135997 - branched_chain_amino_acid_ABC_transporter_substrate_binding_protein 2.155431593 2.5295E-120

1135242 - periplasmic_mannitol_binding_protein 2.297536557 8.1586E-247

1136322 - sorbitol_mannitol_ABC_transporter_permease 2.323099815 4.782E-208

1133047 - hypothetical_protein 2.420199014 3.1735E-245

1132143 - hypothetical_protein 2.423986428 1.09669E-05

1136321 - sorbitol_ABC_transporter_substrate_binding_protein 2.466994243 4.7163E-298

1134953 - sugar_ABC_transporter_substrate_binding_protein 2.513062188 4.5233E-168

1132156 - hypothetical_protein 2.533611732 1.6809E-259

1135127 - ABC_transporter_substrate_binding_protein 2.540687206 8.7498E-275

1134952 - sugar_ABC_transporter_permease 2.551030904 7.6627E-57

1140325 - hypothetical_protein 2.55624483 4.7361E-270

1133046 - hypothetical_protein 2.583562838 3.0512E-209

1135784 - LamB_YcsF_family_protein 2.585164923 2.0377E-287

1135912 - hypothetical_protein 2.699368077 0.000170523

1136693 - hypothetical_protein 2.886748538 1.1145E-246

1135785 - hypothetical_protein 3.137905687 3.2183E-299

1136395 - AraC_family_transcriptional_regulator 3.144633783 0

1132155 - hypothetical_protein 3.176404975 2.3779E-205

1135788 amyA alpha_amylase 3.213508065 2.574E-282

1135786 - hypothetical_protein 3.520265058 0

1136399 - oligopeptide_ABC_transporter_substrate_binding_protein 3.63903859 0

1136396 - hypothetical_protein 3.788970278 0

1132154 - hypothetical_protein 3.803902876 0

1136397 - oligopeptide_ABC_transporter_permease 3.814029577 0

1136398 - oligopeptide_ABC_transporter_permease 3.852438142 0

1135787 - biotin_carboxylase 3.883514872 0

1134530 mtbA MFS_permease 4.56809855 0

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