Structural basis of glycan276-dependent recognition by HIV-1 broadly neutralizing antibodies

Structural basis of glycan276-dependent recognition by HIV-1 broadly neutralizing antibodies

Summary: Recognition of N-linked glycan at residue N276 (glycan276) at the periphery of the CD4-binding site (CD4bs) on the HIV-envelope trimer is a formidable challenge for many CD4bs-directed antibodies. To understand how this glycan can be recognized, here we isolate two lineages of glycan276-dep...

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Autores principales: Christopher A. Cottrell, Kartik Manne, Rui Kong, Shuishu Wang, Tongqing Zhou, Gwo-Yu Chuang, Robert J. Edwards, Rory Henderson, Katarzyna Janowska, Megan Kopp, Bob C. Lin, Mark K. Louder, Adam S. Olia, Reda Rawi, Chen-Hsiang Shen, Justin D. Taft, Jonathan L. Torres, Nelson R. Wu, Baoshan Zhang, Nicole A. Doria-Rose, Myron S. Cohen, Barton F. Haynes, Lawrence Shapiro, Andrew B. Ward, Priyamvada Acharya, John R. Mascola, Peter D. Kwong
Formato: article
Lenguaje:EN
Publicado: Elsevier 2021
Materias:
antibody-antigen binding
antibody approach angle
CD4 binding site
cryo-EM
glycan conformation
glycan276
Biology (General)
QH301-705.5
Acceso en línea:https://doaj.org/article/0dffdf01c46c4651a77c53c885d4f689
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Sumario:Summary: Recognition of N-linked glycan at residue N276 (glycan276) at the periphery of the CD4-binding site (CD4bs) on the HIV-envelope trimer is a formidable challenge for many CD4bs-directed antibodies. To understand how this glycan can be recognized, here we isolate two lineages of glycan276-dependent CD4bs antibodies. Antibody CH540-VRC40.01 (named for donor-lineage.clone) neutralizes 81% of a panel of 208 diverse strains, while antibody CH314-VRC33.01 neutralizes 45%. Cryo-electron microscopy (cryo-EM) structures of these two antibodies and 179NC75, a previously identified glycan276-dependent CD4bs antibody, in complex with HIV-envelope trimer reveal substantially different modes of glycan276 recognition. Despite these differences, binding of glycan276-dependent antibodies maintains a glycan276 conformation similar to that observed in the absence of glycan276-binding antibodies. By contrast, glycan276-independent CD4bs antibodies, such as VRC01, displace glycan276 upon binding. These results provide a foundation for understanding antibody recognition of glycan276 and suggest its presence may be crucial for priming immunogens seeking to initiate broad CD4bs recognition.

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