3D0V

Crystal structure of the HIV-1 Cross Neutralizing Monoclonal Antibody 2F5 in complex with gp41 Peptide LLELDKWASLW

Summary for 3D0V

• Entry DOI: 10.2210/pdb3d0v/pdb
• Related: 1tjh 2p8l 2p8m 2p8p 3d0l
• Descriptor: 2F5 Fab heavy chain, 2F5 Fab light chain, gp41 peptide LLELDKWASLW, ... (4 entities in total)
• Functional Keywords: 2f5, hiv, gp41, antibody, neutralizing, immune system
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 3
• Total formula weight: 49984.15

Authors

Bryson, S.,Julien, J.P.,Pai, E.F. (deposition date: 2008-05-02, release date: 2008-07-29, Last modification date: 2024-11-20)

Primary citation

Julien, J.P.,Bryson, S.,Nieva, J.L.,Pai, E.F.
Structural details of HIV-1 recognition by the broadly neutralizing monoclonal antibody 2F5: epitope conformation, antigen-recognition loop mobility, and anion-binding site.
J.Mol.Biol., 384:377-392, 2008

PubMed Abstract: 2F5 is a monoclonal antibody with potent and broadly neutralizing activity against HIV-1. It targets the membrane-proximal external region (MPER) of the gp41 subunit of the envelope glycoprotein and interferes with the process of fusion between viral and host cell membranes. This study presents eight 2F5 F(ab)' crystal structures in complex with various gp41 peptide epitopes. These structures reveal several key features of this antibody-antigen interaction. (1) Whenever free of contacts caused by crystal artifacts, the extended complementarity-determining region H3 loop is mobile; this is true for ligand-free and epitope-bound forms. (2) The interaction between the antibody and the gp41 ELDKWA epitope core is absolutely critical, and there are also close and specific contacts with residues located N-terminal to the epitope core. (3) Residues located at the C-terminus of the gp41 ELDKWA core do not interact as tightly with the antibody. However, in the presence of a larger peptide containing the gp41 fusion peptide segment, these residues adopt a conformation consistent with the start of an alpha-helix. (4) At high sulfate concentrations, the electron density maps of 2F5 F(ab)'-peptide complexes contain a peak that may mark a binding site for phosphate groups of negatively charged lipid headgroups. The refined atomic-level details of 2F5 paratope-epitope interactions revealed here should contribute to a better understanding of the mechanism of 2F5-based virus neutralization, in general, and prove important for the design of potential vaccine candidates intended to elicit 2F5-like antibody production.

PubMed: 18824005
DOI: 10.1016/j.jmb.2008.09.024

Experimental method

X-RAY DIFFRACTION (2.05 Å)