Antigenicity-defined conformations of an extremely neutralization-resistant HIV-1 envelope spike

Cai, Yongfei; Karaca-Griffin, Selen; Chen, Jia; Tian, Sai; Fredette, Nicholas; Linton, Christine E.; Rits-Volloch, Sophia; Lu, Jianming; Wagh, Kshitij; Theiler, James Patrick; Korber, Bette Tina Marie; Seaman, Michael S.; Harrison, Stephen C.; Carfi, Andrea; Chen, Bing

doi:10.1073/pnas.1700634114

Title: Antigenicity-defined conformations of an extremely neutralization-resistant HIV-1 envelope spike

Journal Article · Mon Apr 10 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1700634114· OSTI ID:1374321

Cai, Yongfei ^[1]; Karaca-Griffin, Selen ^[2]; Chen, Jia ^[1]; Tian, Sai ^[2]; Fredette, Nicholas ^[3]; Linton, Christine E. ^[2]; Rits-Volloch, Sophia ^[1]; Lu, Jianming ^[4];

^[5];

^[5]; Korber, Bette Tina Marie ^[5]; Seaman, Michael S. ^[3]; Harrison, Stephen C. ^[1]; Carfi, Andrea ^[6]; Chen, Bing ^[1]

Boston Children's Hospital, Boston, MA (United States); Harvard Medical School, Boston, MA (United States)
GlaxoSmithKline Vaccines, Rockville, MD (United States)
Beth Israel Deaconess Medical Center, Boston, MA (United States)
Codex BioSolutions, Inc., Gaithersburg, MD (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
GlaxoSmithKline Vaccines, Rockville, MD (United States); Valera LLC, Cambridge, MA (United States)

Here, the extraordinary genetic diversity of the HIV-1 envelope spike [Env; trimeric (gp160)₃, cleaved to (gp120/gp41)₃] poses challenges for vaccine development. Envs of different clinical isolates exhibit different sensitivities to antibody-mediated neutralization. Envs of difficult-to-neutralize viruses are thought to be more stable and conformationally homogeneous trimers than those of easy-to-neutralize viruses, thereby providing more effective concealment of conserved, functionally critical sites. In this study we have characterized the antigenic properties of an Env derived from one of the most neutralization-resistant HIV-1 isolates, CH120.6. Sequence variation at neutralizing epitopes does not fully account for its exceptional resistance to antibodies. The full-length, membrane-bound CH120.6 Env is indeed stable and conformationally homogeneous. Its antigenicity correlates closely with its neutralization sensitivity, and major changes in antigenicity upon CD4 engagement appear to be restricted to the coreceptor site. The CH120.6 gp140 trimer, the soluble and uncleaved ectodomain of (gp160)₃, retains many antigenic properties of the intact Env, consistent with a conformation close to that of Env spikes on a virion, whereas its monomeric gp120 exposes many nonneutralizing or strain-specific epitopes. Thus, trimer organization and stability are important determinants not only for occluding many epitopes but also for conferring resistance to neutralization by all but a small set of antibodies. Env preparations derived from neutralization-resistant viruses may induce irrelevant antibody responses less frequently than do other Envs and may be excellent templates for developing soluble immunogens.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: Universities/Institutions; USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1374321

Report Number(s):: LA-UR-16-29058

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 17; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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Title: Antigenicity-defined conformations of an extremely neutralization-resistant HIV-1 envelope spike

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