3P30

crystal structure of the cluster II Fab 1281 in complex with HIV-1 gp41 ectodomain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.262 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Distinct conformational states of HIV-1 gp41 are recognized by neutralizing and non-neutralizing antibodies.

Frey, G.Chen, J.Rits-Volloch, S.Freeman, M.M.Zolla-Pazner, S.Chen, B.

(2010) Nat Struct Mol Biol 17: 1486-1491

  • DOI: https://doi.org/10.1038/nsmb.1950
  • Primary Citation of Related Structures:  
    3P30

  • PubMed Abstract: 

    HIV-1 envelope glycoprotein gp41 undergoes large conformational changes to drive fusion of viral and target cell membranes, adopting at least three distinct conformations during the viral entry process. Neutralizing antibodies against gp41 block HIV-1 infection by targeting gp41's membrane-proximal external region in a fusion-intermediate state. Here we report biochemical and structural evidence that non-neutralizing antibodies, capable of binding with high affinity to an immunodominant segment adjacent to the neutralizing epitopes in the membrane-proximal region, recognize a gp41 conformation that exists only when membrane fusion is complete. We propose that these non-neutralizing antibodies are induced in HIV-1-infected individuals by gp41 in a triggered, postfusion form and contribute to production of ineffective humoral responses. These results have important implications for gp41-based vaccine design.


  • Organizational Affiliation

    Division of Molecular Medicine, Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HIV-1 gp4196Human immunodeficiency virus 1Mutation(s): 0 
Gene Names: HIV-1 ENV
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
1281 Fab light chainB [auth L]213Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
1281 Fab heavy chainC [auth H]226Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.262 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.83α = 90
b = 115.83β = 90
c = 119.544γ = 120
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
DENZOdata reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-11-08
    Changes: Refinement description