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HIV-1 CD4-binding site germline antibody–Env structures inform vaccine design

Journal Article · · Nature Communications
 [1];  [1];  [1];  [2];  [1];  [3];  [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
  2. Rockefeller Univ., New York, NY (United States). Laboratory of Molecular Immunology; Univ. of Cologne (Germany). University Hospital; German Center for Infection Research, Cologne (Germany). Partner Site Bonn-Cologne
  3. Rockefeller Univ., New York, NY (United States); Howard Hughes Medical Inst., Chevy Chase, MD (United States)
BG24, a VRC01-class broadly neutralizing antibody (bNAb) against HIV-1 Env with relatively few somatic hypermutations (SHMs), represents a promising target for vaccine strategies to elicit CD4-binding site (CD4bs) bNAbs. To understand how SHMs correlate with BG24 neutralization of HIV-1, we report 4.1 Å and 3.4 Å single-particle cryo-EM structures of two inferred germline (iGL) BG24 precursors complexed with engineered Env-based immunogens lacking CD4bs N-glycans. Structures reveal critical Env contacts by BG24iGL and identify antibody light chain structural features that impede Env recognition. In addition, biochemical data and cryo-EM structures of BG24iGL variants bound to Envs with CD4bs glycans present provide insights into N-glycan accommodation, including structural modes of light chain adaptations in the presence of the N276gp120 glycan. Together, these findings reveal Env regions critical for germline antibody recognition and potential sites to alter in immunogen design.
Research Organization:
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
Bill and Melinda Gates Foundation; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2423906
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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