3P30 image
Entry Detail
PDB ID:
3P30
Keywords:
Title:
crystal structure of the cluster II Fab 1281 in complex with HIV-1 gp41 ectodomain
Biological Source:
PDB Version:
Deposition Date:
2010-10-04
Release Date:
2010-11-17
Method Details:
Experimental Method:
Resolution:
3.30 Å
R-Value Free:
0.28
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
H 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HIV-1 gp41
Chain IDs:A
Chain Length:96
Number of Molecules:1
Biological Source:Human immunodeficiency virus 1
Polymer Type:polypeptide(L)
Description:1281 Fab heavy chain
Chain IDs:C (auth: H)
Chain Length:226
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:1281 Fab light chain
Chain IDs:B (auth: L)
Chain Length:213
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Distinct conformational states of HIV-1 gp41 are recognized by neutralizing and non-neutralizing antibodies.
Nat.Struct.Mol.Biol. 17 1486 1491 (2010)
PMID: 21076402 DOI: 10.1038/nsmb.1950

Abstact

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.

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Primary Citation of related structures