5AWN

Crystal structure of Human anti-HIV-1 broadly neutralizing antibody 3BC176 Fab

  • Classification: IMMUNE SYSTEM
  • Organism(s): Homo sapiens
  • Expression System: Homo sapiens
  • Mutation(s): No 

  • Deposited: 2015-07-06 Released: 2015-11-11 
  • Deposition Author(s): Lee, J.H., Wilson, I.A., Ward, A.B.
  • Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases, Bill & Melinda Gates Foundation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Antibodies to a conformational epitope on gp41 neutralize HIV-1 by destabilizing the Env spike.

Lee, J.H.Leaman, D.P.Kim, A.S.Torrents de la Pena, A.Sliepen, K.Yasmeen, A.Derking, R.Ramos, A.de Taeye, S.W.Ozorowski, G.Klein, F.Burton, D.R.Nussenzweig, M.C.Poignard, P.Moore, J.P.Klasse, P.J.Sanders, R.W.Zwick, M.B.Wilson, I.A.Ward, A.B.

(2015) Nat Commun 6: 8167-8167

  • DOI: 10.1038/ncomms9167
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The recent identification of three broadly neutralizing antibodies (bnAbs) against gp120-gp41 interface epitopes has expanded the targetable surface on the HIV-1 envelope glycoprotein (Env) trimer. By using biochemical, biophysical and computational ...

    The recent identification of three broadly neutralizing antibodies (bnAbs) against gp120-gp41 interface epitopes has expanded the targetable surface on the HIV-1 envelope glycoprotein (Env) trimer. By using biochemical, biophysical and computational methods, we map the previously unknown trimer epitopes of two related antibodies, 3BC315 and 3BC176. A cryo-EM reconstruction of a soluble Env trimer bound to 3BC315 Fab at 9.3 Å resolution reveals that the antibody binds between two gp41 protomers, and neutralizes the virus by accelerating trimer decay. In contrast, bnAb 35O22 binding to a partially overlapping quaternary epitope at the gp120-gp41 interface does not induce decay. A conserved gp41-proximal glycan at N88 was also shown to play a role in the binding kinetics of 3BC176 and 3BC315. Finally, our data suggest that the dynamic structure of the Env trimer influences exposure of bnAb epitopes.


    Organizational Affiliation

    Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, California 92037, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heavy chain of 3BC176 FabH232Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Light chain of 3BC176 FabL216Homo sapiensMutation(s): 0 
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.89 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.732α = 90
b = 60.955β = 95.39
c = 87.239γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PHASERphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesP01 AI082362
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesUM1 AI100663
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01 AI084817
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI114401
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI098602
Bill & Melinda Gates FoundationUnited States--

Revision History 

  • Version 1.0: 2015-11-11
    Type: Initial release
  • Version 1.1: 2017-10-18
    Changes: Author supporting evidence, Derived calculations