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The envelope spike of HIV-1 employs a 'glycan shield' to protect itself from antibody-mediated neutralization. Paradoxically, however, potent broadly neutralizing antibodies (bnAbs) that target this shield have been isolated. The unusually high glycan density on the gp120 subunit limits processing during biosynthesis, leaving a region of under-processed oligomannose-type structures, which is a primary target of these bnAbs. Here we investigate the contribution of individual glycosylation sites in the formation of this so-called intrinsic mannose patch. Deletion of individual sites has a limited effect on the overall size of the intrinsic mannose patch but leads to changes in the processing of neighbouring glycans. These structural changes are largely tolerated by a panel of glycan-dependent bnAbs targeting these regions, indicating a degree of plasticity in their recognition. These results support the intrinsic mannose patch as a stable target for vaccine design.

Original publication

DOI

10.1038/ncomms8479

Type

Journal article

Journal

Nat Commun

Publication Date

24/06/2015

Volume

6

Keywords

Antibodies, Neutralizing, Enzyme-Linked Immunosorbent Assay, Glycosylation, HEK293 Cells, HIV Envelope Protein gp120, HIV-1, Humans, Mannose, Mass Spectrometry, Mutagenesis, Site-Directed, Polysaccharides