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TitleRestriction of HIV-1 Escape by a Highly Broad and Potent Neutralizing Antibody.
Journal, issue, pagesCell, Vol. 180, Issue 3, Page 471-489.e22, Year 2020
Publish dateFeb 6, 2020
AuthorsPhilipp Schommers / Henning Gruell / Morgan E Abernathy / My-Kim Tran / Adam S Dingens / Harry B Gristick / Christopher O Barnes / Till Schoofs / Maike Schlotz / Kanika Vanshylla / Christoph Kreer / Daniela Weiland / Udo Holtick / Christof Scheid / Markus M Valter / Marit J van Gils / Rogier W Sanders / Jörg J Vehreschild / Oliver A Cornely / Clara Lehmann / Gerd Fätkenheuer / Michael S Seaman / Jesse D Bloom / Pamela J Bjorkman / Florian Klein /
PubMed AbstractBroadly neutralizing antibodies (bNAbs) represent a promising approach to prevent and treat HIV-1 infection. However, viral escape through mutation of the HIV-1 envelope glycoprotein (Env) limits ...Broadly neutralizing antibodies (bNAbs) represent a promising approach to prevent and treat HIV-1 infection. However, viral escape through mutation of the HIV-1 envelope glycoprotein (Env) limits clinical applications. Here we describe 1-18, a new V1-46-encoded CD4 binding site (CD4bs) bNAb with outstanding breadth (97%) and potency (GeoMean IC = 0.048 μg/mL). Notably, 1-18 is not susceptible to typical CD4bs escape mutations and effectively overcomes HIV-1 resistance to other CD4bs bNAbs. Moreover, mutational antigenic profiling uncovered restricted pathways of HIV-1 escape. Of most promise for therapeutic use, even 1-18 alone fully suppressed viremia in HIV-1-infected humanized mice without selecting for resistant viral variants. A 2.5-Å cryo-EM structure of a 1-18-BG505 Env complex revealed that these characteristics are likely facilitated by a heavy-chain insertion and increased inter-protomer contacts. The ability of 1-18 to effectively restrict HIV-1 escape pathways provides a new option to successfully prevent and treat HIV-1 infection.
External linksCell / PubMed:32004464 / PubMed Central
MethodsEM (single particle)
Resolution2.5 - 3.9 Å
Structure data

EMDB-20739, PDB-6udj:
HIV-1 bNAb 1-18 in complex with BG505 SOSIP.664 and 10-1074
Method: EM (single particle) / Resolution: 2.5 Å

EMDB-20740, PDB-6udk:
HIV-1 bNAb 1-55 in complex with modified BG505 SOSIP-based immunogen RC1 and 10-1074
Method: EM (single particle) / Resolution: 3.9 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine

ChemComp-HOH:
WATER / Water

Source
  • homo sapiens (human)
  • human immunodeficiency virus 1
KeywordsVIRAL PROTEIN/IMMUNE SYSTEM / HIV-1 broadly neutralizing antibody / Env / cryo-EM / bNAb / VIRAL PROTEIN-IMMUNE SYSTEM complex / Env trimer / RC1 / CD4-binding site

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