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Resistance of human immunodeficiency virus type 1 to the high-mannose binding agents cyanovirin N and concanavalin A.

Abstract：

:Due to the biological significance of the carbohydrate component of the human immunodeficiency virus type 1 (HIV-1) glycoproteins in viral pathogenesis, the glycosylation step constitutes an attractive target for anti-HIV therapy. Cyanovirin N (CV-N), which specifically targets the high-mannose (HM) glycans on gp120, has been identified as a potent HIV-1 entry inhibitor. Concanavalin A (ConA) represents another mannose-binding lectin, although it has a lower specificity for HM glycans than that of CV-N. For the present study, we selected CV-N- and ConA-resistant HIV-1 strains in the presence of CV-N and ConA, respectively. Both resistant strains exhibited a variety of mutations eliminating N-linked glycans within gp120. Strains resistant to CV-N or ConA displayed high levels of cross-resistance towards one another. The N-glycan at position 302 was eliminated in both of the lectin-resistant strains. However, the elimination of this glycan alone by site-directed mutagenesis was not sufficient to render HIV-1 resistant to CV-N or ConA, suggesting that HIV-1 needs to mutate several N-glycans to become resistant to these lectins. Both strains also demonstrated clear cross-resistance towards the carbohydrate-dependent monoclonal antibody 2G12. In contrast, the selected strains did not show a reduced susceptibility towards the nonlectin entry inhibitors AMD3100 and enfuvirtide or towards reverse transcriptase or protease inhibitors. Recombination of the mutated gp160 genes of the strains resistant to CV-N or ConA into a wild-type background fully reproduced the (cross-)resistance profiles of the originally selected strains, pointing to the impact of the N-glycan mutations on the phenotypic resistance profiles of both selected strains.

journal_name

J Virol

journal_title

Journal of virology

authors

Witvrouw M,Fikkert V,Hantson A,Pannecouque C,O'keefe BR,McMahon J,Stamatatos L,de Clercq E,Bolmstedt A

doi

10.1128/JVI.79.12.7777-7784.2005

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

7777-84

issue

eissn

0022-538X

issn

1098-5514

pii

79/12/7777

journal_volume

pub_type

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Resistance of human immunodeficiency virus type 1 to the high-mannose binding agents cyanovirin N and concanavalin A.