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TitleComplete functional mapping of infection- and vaccine-elicited antibodies against the fusion peptide of HIV.
Journal, issue, pagesPLoS Pathog, Vol. 14, Issue 7, Page e1007159, Year 2018
Publish dateJul 5, 2018
AuthorsAdam S Dingens / Priyamvada Acharya / Hugh K Haddox / Reda Rawi / Kai Xu / Gwo-Yu Chuang / Hui Wei / Baoshan Zhang / John R Mascola / Bridget Carragher / Clinton S Potter / Julie Overbaugh / Peter D Kwong / Jesse D Bloom /
PubMed AbstractEliciting broadly neutralizing antibodies (bnAbs) targeting envelope (Env) is a major goal of HIV vaccine development, but cross-clade breadth from immunization has only sporadically been observed. ...Eliciting broadly neutralizing antibodies (bnAbs) targeting envelope (Env) is a major goal of HIV vaccine development, but cross-clade breadth from immunization has only sporadically been observed. Recently, Xu et al (2018) elicited cross-reactive neutralizing antibody responses in a variety of animal models using immunogens based on the epitope of bnAb VRC34.01. The VRC34.01 antibody, which was elicited by natural human infection, targets the N terminus of the Env fusion peptide, a critical component of the virus entry machinery. Here we precisely characterize the functional epitopes of VRC34.01 and two vaccine-elicited murine antibodies by mapping all single amino-acid mutations to the BG505 Env that affect viral neutralization. While escape from VRC34.01 occurred via mutations in both fusion peptide and distal interacting sites of the Env trimer, escape from the vaccine-elicited antibodies was mediated predominantly by mutations in the fusion peptide. Cryo-electron microscopy of four vaccine-elicited antibodies in complex with Env trimer revealed focused recognition of the fusion peptide and provided a structural basis for development of neutralization breadth. Together, these functional and structural data suggest that the breadth of vaccine-elicited antibodies targeting the fusion peptide can be enhanced by specific interactions with additional portions of Env. Thus, our complete maps of viral escape both delineate pathways of resistance to these fusion peptide-directed antibodies and provide a strategy to improve the breadth or potency of future vaccine-induced antibodies against Env's fusion peptide.
External linksPLoS Pathog / PubMed:29975771 / PubMed Central
MethodsEM (single particle)
Resolution4.0 Å
Structure data

7621

6cue

EMDB-7621, PDB-6cue:
Cryo-EM structure at 4.0 A resolution of vaccine-elicited antibody vFP7.04 in complex with HIV-1 Env BG505 DS-SOSIP, and antibodies VRC03 and PGT122
Method: EM (single particle) / Resolution: 4.0 Å

7622

6cuf

EMDB-7622, PDB-6cuf:
Cryo-EM structure at 4.2 A resolution of vaccine-elicited antibody vFP1.01 in complex with HIV-1 Env BG505 DS-SOSIP, and antibodies VRC03 and PGT122
Method: EM (single particle) / Resolution: 4.0 Å

Chemicals

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

Source
  • homo sapiens (human)
  • human immunodeficiency virus 1
  • mus musculus (house mouse)
KeywordsVIRAL PROTEIN / HIV-1 Env / BG505 SOSIP / fusion peptide / VRC03 / PGT122 / vFP7.04

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