Palmitoylation of the HIV-1 envelope glycoprotein is critical for viral infectivity

Itay Rousso, Mark B. Mixon, Benjamin K. Chen, Peter S. Kim

Research output: Contribution to journalArticlepeer-review

155 Scopus citations

Abstract

Recent studies suggest that HIV-1 budding occurs selectively from detergent-insoluble membrane domains, referred to as lipid rafts. Palmitoylation is thought to be one of the factors responsible for targeting membrane proteins to lipid rafts. The cytoplasmic domain of the HIV-1 envelope glycoprotein (gp160) contains two palmitoylated cysteine residues. In this work, we studied the solubility of gp160 after detergent extraction. We show that wild-type gp160 is mostly insoluble after ice-cold Triton X-100 extraction, but that it becomes almost completely soluble at 37°C. In contrast, we find that a mutant gp160, in which the two palmitoylated cysteine residues are replaced by serine, is Triton X-100 soluble even under ice-cold extraction. These findings are consistent with the properties of proteins that localize to lipid rafts and strongly suggest that gp160 is associated with lipid rafts. Further, removal of both palmitoylation sites results in the formation of virus with low levels of gp160 incorporation as well as a decrease in viral infectivity by 60-fold. Our results strongly support the suggestion that HIV-1 buds from lipid rafts and point to a role for rafts as a viral assembly hub.

Original languageEnglish
Pages (from-to)13523-13525
Number of pages3
JournalProceedings of the National Academy of Sciences of the United States of America
Volume97
Issue number25
DOIs
StatePublished - 5 Dec 2000
Externally publishedYes

ASJC Scopus subject areas

  • General

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