1Q1J image
Deposition Date 2003-07-21
Release Date 2004-02-17
Last Version Date 2024-11-06
Entry Detail
PDB ID:
1Q1J
Keywords:
IMMUNE SYSTEM
Title:
Crystal Structure Analysis of anti-HIV-1 Fab 447-52D in complex with V3 peptide
Biological Source:
Source Organism:
(Taxon ID: )Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.50 Å
R-Value Free:
0.28
R-Value Work:
0.25
R-Value Observed:
0.25
Space Group:
P 1 21 1
1Q1J validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Fab 447-52D, heavy chain
Chain IDs:B (auth: H), E (auth: I)
Chain Length:231
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Fab 447-52D, light chain
Chain IDs:A (auth: L), D (auth: M)
Chain Length:215
Number of Molecules:2
Biological Source:Homo sapiens
Protein Blast
Polymer Type:polypeptide(L)
Molecule:gp120 V3 peptide
Chain IDs:C (auth: P), F (auth: Q)
Chain Length:16
Number of Molecules:2
Biological Source:
UniProt ID:P05877
Primary Citation
Structural rationale for the broad neutralization of HIV-1 by human monoclonal antibody 447-52D.
Structure 12 193 204 (2004)
PMID: 14962380 DOI: 10.1016/j.str.2004.01.003

Abstact

447-52D is a human monoclonal antibody isolated from a heterohybridoma derived from an HIV-1-infected individual. This antibody recognizes the hypervariable gp120 V3 loop, and neutralizes both X4 and R5 primary isolates, making it one of the most effective anti-V3 antibodies characterized to date. The crystal structure of the 447-52D Fab in complex with a 16-mer V3 peptide at 2.5 A resolution reveals that the peptide beta hairpin forms a three-stranded mixed beta sheet with complementarity determining region (CDR) H3, with most of the V3 side chains exposed to solvent. Sequence specificity is conferred through interaction of the type-II turn (residues GPGR) at the apex of the V3 hairpin with the base of CDR H3. This novel mode of peptide-antibody recognition enables the antibody to bind to many different V3 sequences where only the GPxR core epitope is absolutely required.

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Primary Citation of related structures
1Q1J