3bqu

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Crystal Structure of the 2F5 Fab'-3H6 Fab Complex

Structural highlights

3bqu is a 4 chain structure with sequence from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3Å
Ligands:SO4
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

Q6PYX1_HUMAN

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The monoclonal antibody 2F5 neutralizes a broad range of human immunodeficiency virus-1 isolates via a conserved epitope on the viral glycoprotein gp41. The conformation of the principal epitope is a type I beta-turn centered on gp41 residues (664)DKW(666); in addition, binding studies indicate that residues N- and C-terminal to this core as well as structurally more distant parts of gp41 also contribute to the interaction. Ab2/3H6 is an anti-idiotypic antibody that inhibits the interaction between 2F5 and gp41 and as such, Ab2/3H6 may, in principle, possess a paratope that mimics the gp41 epitope. To establish the potential of Ab2/3H6 to serve as a guide for the design of vaccine components against human immunodeficiency virus, we investigated the crystal structure of the heterodimeric complex of Ab2/3H6 F(ab) and 2F5 F(ab)'. Ab2/3H6 F(ab) binds to 2F5 F(ab)' via a helix-like protrusion formed by residues (58(H))RYSPSLNTRL(67(H)) of the 2F5 F(ab)' variable domain and proximal to but not overlapping with the gp41 (664)DKW(666) epitope-binding pocket. This defines Ab2/3H6 as an anti-idiotypic antibody of the Ab2gamma class, i.e., an antigen-inhibitable idiotype that does not carry the internal image of the linear primary gp41 (662)ELDKWAS(668) epitope.

Crystal structure of the complex between the F(ab)' fragment of the cross-neutralizing anti-HIV-1 antibody 2F5 and the F(ab) fragment of its anti-idiotypic antibody 3H6.,Bryson S, Julien JP, Isenman DE, Kunert R, Katinger H, Pai EF J Mol Biol. 2008 Oct 17;382(4):910-9. Epub 2008 Jul 27. PMID:18692506[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. Bryson S, Julien JP, Isenman DE, Kunert R, Katinger H, Pai EF. Crystal structure of the complex between the F(ab)' fragment of the cross-neutralizing anti-HIV-1 antibody 2F5 and the F(ab) fragment of its anti-idiotypic antibody 3H6. J Mol Biol. 2008 Oct 17;382(4):910-9. Epub 2008 Jul 27. PMID:18692506 doi:10.1016/j.jmb.2008.07.057

Contents


PDB ID 3bqu

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