2A6I

Crystal structure analysis of the anti-arsonate germline antibody 36-65 in complex with a phage display derived dodecapeptide KLASIPTHTSPL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.246 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history

Re-refinement Note

A newer entry is available that reflects an alternative modeling of the original data: 5VGA


Literature

Differential epitope positioning within the germline antibody paratope enhances promiscuity in the primary immune response.

Sethi, D.K.Agarwal, A.Manivel, V.Rao, K.V.Salunke, D.M.

(2006) Immunity 24: 429-438

  • DOI: 10.1016/j.immuni.2006.02.010
  • Primary Citation of Related Structures:  
    2A6D, 2A6K, 2A6J, 2A6I

  • PubMed Abstract: 
  • Correlation between the promiscuity of the primary antibody response and conformational flexibility in a germline antibody was addressed by using germline antibody 36-65. Crystallographic analyses of the 36-65 Fab with three independent dodecapeptides pr ...

    Correlation between the promiscuity of the primary antibody response and conformational flexibility in a germline antibody was addressed by using germline antibody 36-65. Crystallographic analyses of the 36-65 Fab with three independent dodecapeptides provided mechanistic insights into the generation of antibody diversity. While four antigen-free Fab molecules provided a quantitative description of the conformational repertoire of the antibody CDRs, three Fab molecules bound to structurally diverse peptide epitopes exhibited a common paratope conformation. Each peptide revealed spatially different footprints within the antigen-combining site. However, a conformation-specific lock involving two shared residues, which were also associated with hapten binding, was discernible. Unlike the hapten, the peptides interacted with residues that undergo somatic mutations, suggesting a possible mechanism for excluding "nonspecific" antigens during affinity maturation. The observed multiple binding modes of diverse epitopes within a common paratope conformation of a germline antibody reveal a simple, yet elegant, mechanism for expanding the primary antibody repertoire.


    Organizational Affiliation

    National Institute of Immunology, New Delhi 110067, India.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Germline antibody 36-65 Fab light chain A214Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Germline antibody 36-65 Fab heavy chain B222Mus musculusMutation(s): 0 
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Dodecapeptide: KLASIPTHTSPL P12N/AMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.246 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.182α = 90
b = 76.971β = 101.97
c = 59.122γ = 90
Software Package:
Software NamePurpose
MAR345data collection
AUTOMARdata reduction
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2018-03-21
    Changes: Database references