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Journal of General Virology 2015-Dec

Sensitivity of transmitted and founder human immunodeficiency virus type 1 envelopes to carbohydrate-binding agents griffithsin, cyanovirin-N and Galanthus nivalis agglutinin.

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Bodan Hu
Tao Du
Chang Li
Sukun Luo
Yalan Liu
Xin Huang
Qinxue Hu

Ključne riječi

Sažetak

Human immunodeficiency virus type 1 (HIV-1) transmission often results from infection by a single transmitted/founder (T/F) virus. Here, we investigated the sensitivity of T/F HIV-1 envelope glycoproteins (Envs) to microbicide candidate carbohydrate-binding agents (CBAs) griffithsin (GRFT), cyanovirin-N (CV-N) and Galanthus nivalis agglutinin (GNA), showing that T/F Envs demonstrated different sensitivity to CBAs, with IC50 values ranging from 0.006 ± 0.0003 to >10 nM for GRFT, from 0.6 ± 0.2 to 28.9 ± 2.9 nM for CV-N and from 1.3 ± 0.2 to >500 nM for GNA. We further revealed that deglycosylation at position 295 or 448 decreased the sensitivity of T/F Env to GRFT, and at 339 to both CV-N and GNA. Mutation of all the three glcyans rendered a CBA-sensitive T/F Env largely resistant to GRFT, indicating that the sensitivity of T/F Env to GRFT is mainly determined by glycans at 295, 339 and 448. Our study identified specific T/F Env residues associated with CBA sensitivity.

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