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7/31/2019 Comparative Protein Structure Modeling
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Build a model for the targetusing information from template structures
Evaluate the model
model
OK?
NO
YES
TEMPLATE
STRUCTURE
...
KLTDSQNF
DEYMKALGV
GFATRQV G
NVTKPTVIISQEGG
KVV.
.
.
TARGET
SEQUENCE
Align target sequence with
template structures
Select templates
ALIGNMENT
...KLTDSQNFDEYMKALGVGFATRQVGNVTKPTVIISQEGGKVV...
...KLVSSENFDDYMKEVGVGFATRKVAGMAKPNMIISVNGDLVT...
TARGET
TEMPLATE
MODEL
TARGET
START
END
0 20 40 60 80 100 120
-2.4
-1.6
-0.8
0.0
0.8
blbp.B99990001
RESIDUE INDEX
PSEUDOE
NERGY
Identify related structures
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GKIFYERGFQGHCYESDC-NLQP
GKIFYERG---RCYESDCPNLQP
STRUCTURE
SEQUENCE
G-
K-I
-F
-Y-
E-R-G-R-
C-Y-
E
-
S-D-
C-P-N
-L-Q
-P
TARGET-TEMPLATE
ALIGNMENT
EXTRACT SPATIAL
RESTRAINTS
SATISFY SPATIAL
RESTRAINTS
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a
Model - Target
Template - Target
Template - Target difference
Alignment error
0 20 40 60 80 1000
20
40
60
80
100
% Sequence identity
%S
tructureoverla
p
0 20 40 60 80 1000
20
40
60
80
100
b
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0 50 100 150 200 250 300
2.0
1.0
0.0
1.0
Residue number
ProsaIIe
nergy
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