Enhanced HIV-1 neutralization by antibody heteroligation.

TitleEnhanced HIV-1 neutralization by antibody heteroligation.
Publication TypeJournal Article
Year of Publication2012
AuthorsMouquet H, Warncke M, Scheid JF, Seaman MS, Nussenzweig MC
JournalProc Natl Acad Sci U S A
Volume109
Issue3
Pagination875-80
Date Published2012 Jan 17
ISSN1091-6490
KeywordsAntibodies, Bispecific, Antibodies, Neutralizing, Antigens, Viral, HEK293 Cells, HIV Antibodies, HIV Envelope Protein gp120, HIV Envelope Protein gp41, HIV-1, Humans, Immunoglobulin G, Neutralization Tests, Protein Binding, Protein Engineering, Single-Chain Antibodies
Abstract

Passive transfer of broadly neutralizing human antibodies against HIV-1 protects macaques against infection. However, HIV-1 uses several strategies to escape antibody neutralization, including mutation of the gp160 viral surface spike, a glycan shield to block antibody access to the spike, and expression of a limited number of viral surface spikes, which interferes with bivalent antibody binding. The latter is thought to decrease antibody apparent affinity or avidity, thereby interfering with neutralizing activity. To test the idea that increasing apparent affinity might enhance neutralizing activity, we engineered bispecific anti-HIV-1 antibodies (BiAbs) that can bind bivalently by virtue of one scFv arm that binds to gp120 and a second arm to the gp41 subunit of gp160. The individual arms of the BiAbs preserved the binding specificities of the original anti-HIV IgG antibodies and together bound simultaneously to gp120 and gp41. Heterotypic bivalent binding enhanced neutralization compared with the parental antibodies. We conclude that antibody recognition and viral neutralization of HIV can be improved by heteroligation.

DOI10.1073/pnas.1120059109
Alternate JournalProc. Natl. Acad. Sci. U.S.A.
PubMed ID22219363