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Science. 2015 Jul 10;349(6244):156-61. doi: 10.1126/science.aac5894. Epub 2015 Jun 18.

HIV-1 VACCINES. Priming a broadly neutralizing antibody response to HIV-1 using a germline-targeting immunogen.

Author information

1
Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037, USA. International AIDS Vaccine Initiative (IAVI) Neutralizing Antibody Center (NAC), The Scripps Research Institute, La Jolla, CA 92037, USA. Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, CA 92037, USA.
2
Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037, USA.
3
Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037, USA. International AIDS Vaccine Initiative (IAVI) Neutralizing Antibody Center (NAC), The Scripps Research Institute, La Jolla, CA 92037, USA. Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, CA 92037, USA. Ragon Institute of MGH, MIT, and Harvard, Cambridge, MA 02129, USA. nemazee@scripps.edu schief@scripps.edu burton@scripps.edu.
4
Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, CA 92037, USA. nemazee@scripps.edu schief@scripps.edu burton@scripps.edu.

Abstract

A major goal of HIV-1 vaccine research is the design of immunogens capable of inducing broadly neutralizing antibodies (bnAbs) that bind to the viral envelope glycoprotein (Env). Poor binding of Env to unmutated precursors of bnAbs, including those of the VRC01 class, appears to be a major problem for bnAb induction. We engineered an immunogen that binds to VRC01-class bnAb precursors and immunized knock-in mice expressing germline-reverted VRC01 heavy chains. Induced antibodies showed characteristics of VRC01-class bnAbs, including a short CDRL3 (light-chain complementarity-determining region 3) and mutations that favored binding to near-native HIV-1 gp120 constructs. In contrast, native-like immunogens failed to activate VRC01-class precursors. The results suggest that rational epitope design can prime rare B cell precursors for affinity maturation to desired targets.

PMID:
26089355
PMCID:
PMC4669217
DOI:
10.1126/science.aac5894
[Indexed for MEDLINE]
Free PMC Article

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