3IDX

Crystal structure of HIV-gp120 core in complex with CD4-binding site antibody b13, space group C222


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.181 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural basis of immune evasion at the site of CD4 attachment on HIV-1 gp120.

Chen, L.Do Kwon, Y.Zhou, T.Wu, X.O'Dell, S.Cavacini, L.Hessell, A.J.Pancera, M.Tang, M.Xu, L.Yang, Z.Y.Zhang, M.Y.Arthos, J.Burton, D.R.Dimitrov, D.S.Nabel, G.J.Posner, M.R.Sodroski, J.Wyatt, R.Mascola, J.R.Kwong, P.D.

(2009) Science 326: 1123-1127

  • DOI: https://doi.org/10.1126/science.1175868
  • Primary Citation of Related Structures:  
    3HI1, 3IDX, 3IDY

  • PubMed Abstract: 

    The site on HIV-1 gp120 that binds to the CD4 receptor is vulnerable to antibodies. However, most antibodies that interact with this site cannot neutralize HIV-1. To understand the basis of this resistance, we determined co-crystal structures for two poorly neutralizing, CD4-binding site (CD4BS) antibodies, F105 and b13, in complexes with gp120. Both antibodies exhibited approach angles to gp120 similar to those of CD4 and a rare, broadly neutralizing CD4BS antibody, b12. Slight differences in recognition, however, resulted in substantial differences in F105- and b13-bound conformations relative to b12-bound gp120. Modeling and binding experiments revealed these conformations to be poorly compatible with the viral spike. This incompatibility, the consequence of slight differences in CD4BS recognition, renders HIV-1 resistant to all but the most accurately targeted antibodies.


  • Organizational Affiliation

    Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HIV-1 HxBc2 gp120 coreA [auth G]317Human immunodeficiency virus 1Mutation(s): 0 
Gene Names: env
UniProt
Find proteins for P04578 (Human immunodeficiency virus type 1 group M subtype B (isolate HXB2))
Explore P04578 
Go to UniProtKB:  P04578
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04578
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Fab b13 heavy chainB [auth H]231Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Fab b13 light chainC [auth L]215Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download Ideal Coordinates CCD File 
T [auth G],
Z [auth H]
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
D [auth G]
E [auth G]
F [auth G]
G
H [auth G]
D [auth G],
E [auth G],
F [auth G],
G,
H [auth G],
I [auth G],
J [auth G],
K [auth G],
L [auth G],
M [auth G],
N [auth G],
O [auth G],
P [auth G],
Q [auth G],
R [auth G],
S [auth G]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
U [auth G],
V [auth G],
W [auth G],
X [auth G]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

Download Ideal Coordinates CCD File 
Y [auth G]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.181 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.609α = 90
b = 203.964β = 90
c = 109.291γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2009-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.3: 2021-03-31
    Changes: Source and taxonomy, Structure summary
  • Version 1.4: 2023-09-06
    Changes: Data collection, Database references, Refinement description