The Tetrameric Plant Lectin BanLec Neutralizes HIV through Bidentate Binding to Specific Viral Glycans.

TitleThe Tetrameric Plant Lectin BanLec Neutralizes HIV through Bidentate Binding to Specific Viral Glycans.
Publication TypeJournal Article
Year of Publication2017
AuthorsHopper JTS, Ambrose S, Grant OC, Krumm SA, Allison TM, Degiacomi MT, Tully MD, Pritchard LK, Ozorowski G, Ward AB, Crispin M, Doores KJ, Woods RJ, Benesch JLP, Robinson CV, Struwe WB
JournalStructure
Volume25
Issue5
Pagination773-782.e5
Date Published05/02/2017
ISSN1878-4186
Abstract

Select lectins have powerful anti-viral properties that effectively neutralize HIV-1 by targeting the dense glycan shield on the virus. Here, we reveal the mechanism by which one of the most potent lectins, BanLec, achieves its inhibition. We identify that BanLec recognizes a subset of high-mannose glycans via bidentate interactions spanning the two binding sites present on each BanLec monomer that were previously considered separate carbohydrate recognition domains. We show that both sites are required for high-affinity glycan binding and virus neutralization. Unexpectedly we find that BanLec adopts a tetrameric stoichiometry in solution whereby the glycan-binding sites are positioned to optimally target glycosylated viral spikes. The tetrameric architecture, together with bidentate binding to individual glycans, leads to layers of multivalency that drive viral neutralization through enhanced avidity effects. These structural insights will prove useful in engineering successful lectin therapeutics targeting the dense glycan shield of HIV.

DOI10.1016/j.str.2017.03.015
Alternate JournalStructure
PubMed ID28434916
PubMed Central IDPMC5556678
Grant List / / Wellcome Trust / United Kingdom
P41 GM103390 / GM / NIGMS NIH HHS / United States
U01 CA207824 / CA / NCI NIH HHS / United States
UM1 AI100663 / AI / NIAID NIH HHS / United States
CHAVI-ID: 
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