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

ABSTRACT: 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 BG24_iGL and identify antibody light chain structural features that impede Env recognition. In addition, biochemical data and cryo-EM structures of BG24_iGL variants bound to Envs with CD4bs glycans present provide insights into N-glycan accommodation, including struc

SUBMITTER: Dam KA 

PROVIDER: S-EPMC9576718 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature