Structural Basis of Immune Evasion at the Site of CD4 Attachment on HIV-1 gp120

Author:

Chen Lei1,Do Kwon Young1,Zhou Tongqing1,Wu Xueling1,O’Dell Sijy1,Cavacini Lisa2,Hessell Ann J.3,Pancera Marie1,Tang Min1,Xu Ling1,Yang Zhi-Yong1,Zhang Mei-Yun4,Arthos James5,Burton Dennis R.36,Dimitrov Dimiter S.4,Nabel Gary J.1,Posner Marshall R.2,Sodroski Joseph7,Wyatt Richard1,Mascola John R.1,Kwong Peter D.1

Affiliation:

1. Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

2. Head and Neck Oncology Program, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.

3. Departments of Immunology and Microbial Science and International AIDS Vaccine Initiative Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, CA 92037, USA.

4. Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA.

5. Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

6. Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Boston, MA 02114, USA.

7. Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.

Abstract

Anti-HIV Antibody Constraints Despite significant efforts, an effective vaccine against the HIV-1 virus remains elusive. A site on the HIV-1 gp120 envelope glycoprotein that binds to the CD4 receptor on host cells is vulnerable to antibody, but only rarely are antibodies against this site broadly neutralizing. L. Chen et al. (p. 1123 ) have determined crystal structures for two weakly neutralizing antibodies in complex with gp120. The epitopes recognized by these antibodies were similar to those bound by CD4 or a broadly neutralizing antibody. However, small differences in recognition induced conformational shifts in gp120 that were incompatible with formation of a functional viral spike. Thus, the antibody-vulnerable site on HIV-1 is protected by conformational constraints.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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