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TitleComprehensive antigenic map of a cleaved soluble HIV-1 envelope trimer.
Journal, issue, pagesPLoS Pathog, Vol. 11, Issue 3, Page e1004767, Year 2015
Publish dateMar 25, 2015
AuthorsRonald Derking / Gabriel Ozorowski / Kwinten Sliepen / Anila Yasmeen / Albert Cupo / Jonathan L Torres / Jean-Philippe Julien / Jeong Hyun Lee / Thijs van Montfort / Steven W de Taeye / Mark Connors / Dennis R Burton / Ian A Wilson / Per-Johan Klasse / Andrew B Ward / John P Moore / Rogier W Sanders /
PubMed AbstractThe trimeric envelope (Env) spike is the focus of vaccine design efforts aimed at generating broadly neutralizing antibodies (bNAbs) to protect against HIV-1 infection. Three recent developments have ...The trimeric envelope (Env) spike is the focus of vaccine design efforts aimed at generating broadly neutralizing antibodies (bNAbs) to protect against HIV-1 infection. Three recent developments have facilitated a thorough investigation of the antigenic structure of the Env trimer: 1) the isolation of many bNAbs against multiple different epitopes; 2) the generation of a soluble trimer mimic, BG505 SOSIP.664 gp140, that expresses most bNAb epitopes; 3) facile binding assays involving the oriented immobilization of tagged trimers. Using these tools, we generated an antigenic map of the trimer by antibody cross-competition. Our analysis delineates three well-defined epitope clusters (CD4 binding site, quaternary V1V2 and Asn332-centered oligomannose patch) and new epitopes at the gp120-gp41 interface. It also identifies the relationships among these clusters. In addition to epitope overlap, we defined three more ways in which antibodies can cross-compete: steric competition from binding to proximal but non-overlapping epitopes (e.g., PGT151 inhibition of 8ANC195 binding); allosteric inhibition (e.g., PGT145 inhibition of 1NC9, 8ANC195, PGT151 and CD4 binding); and competition by reorientation of glycans (e.g., PGT135 inhibition of CD4bs bNAbs, and CD4bs bNAb inhibition of 8ANC195). We further demonstrate that bNAb binding can be complex, often affecting several other areas of the trimer surface beyond the epitope. This extensive analysis of the antigenic structure and the epitope interrelationships of the Env trimer should aid in design of both bNAb-based therapies and vaccines intended to induce bNAbs.
External linksPLoS Pathog / PubMed:25807248 / PubMed Central
MethodsEM (single particle)
Resolution15.0 - 22.0 Å
Structure data

EMDB-2853:
3BNC117 Fab in complex with BG505 SOSIP.664 Trimer
Method: EM (single particle) / Resolution: 20.0 Å

EMDB-6249:
1NC9 Fab in complex with BG505 SOSIP.664 Trimer
Method: EM (single particle) / Resolution: 18.0 Å

EMDB-6250:
CH103 Fab in complex with BG505 SOSIP.664 Trimer
Method: EM (single particle) / Resolution: 15.0 Å

EMDB-6251:
CH106 Fab in complex with BG505 SOSIP.664 Trimer
Method: EM (single particle) / Resolution: 19.0 Å

EMDB-6252:
VRC01 Fab in complex with BG505 SOSIP.664 Trimer
Method: EM (single particle) / Resolution: 22.0 Å

Source
  • Human immunodeficiency virus 1
  • Homo sapiens (human)

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