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PLoS Pathog. 2012 Dec;8(12):e1003085. doi: 10.1371/journal.ppat.1003085. Epub 2012 Dec 27.

Inhibition of a NEDD8 Cascade Restores Restriction of HIV by APOBEC3G.

Author information

1
Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California, United States of America.

Abstract

Cellular restriction factors help to defend humans against human immunodeficiency virus (HIV). HIV accessory proteins hijack at least three different Cullin-RING ubiquitin ligases, which must be activated by the small ubiquitin-like protein NEDD8, in order to counteract host cellular restriction factors. We found that conjugation of NEDD8 to Cullin-5 by the NEDD8-conjugating enzyme UBE2F is required for HIV Vif-mediated degradation of the host restriction factor APOBEC3G (A3G). Pharmacological inhibition of the NEDD8 E1 by MLN4924 or knockdown of either UBE2F or its RING-protein binding partner RBX2 bypasses the effect of Vif, restoring the restriction of HIV by A3G. NMR mapping and mutational analyses define specificity determinants of the UBE2F NEDD8 cascade. These studies demonstrate that disrupting host NEDD8 cascades presents a novel antiretroviral therapeutic approach enhancing the ability of the immune system to combat HIV.

PMID:
23300442
PMCID:
PMC3531493
DOI:
10.1371/journal.ppat.1003085
[Indexed for MEDLINE]
Free PMC Article

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