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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