Suppression of HIV-1 Nef Translation by Sam68 Mutant-Induced Stress Granules and nef mRNA Sequestration

Jorge Henao-Mejia, Ying Liu, In Woo Park, Jizhong Zhang, Jeremy Sanford, Johnny J. He

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

HIV-1 Nef plays important roles in HIV-1 replication and pathogenesis. It is translated from completely spliced HIV-1 RNA, and its expression is inherently regulated at the levels of viral DNA transcription and RNA splicing. Here we show that Sam68 cytoplasmic mutants potently suppress Nef expression. The suppression requires Sam68 domain aa 269-321 and is correlated with its ability to induce stress granules. In addition, the suppression is specific to Nef, and direct binding to nef mRNA 3′UTR confers the suppression specificity. Furthermore, nef mRNA is targeted to and enriched in these induced stress granules. Importantly, Nef suppression occurs in the context of HIV-1 infection of CD4+ T lymphocytes with little MHC I and CD4 downregulation. Taken together, these results demonstrate that stress granule induction and nef mRNA sequestration account for this translational suppression of Nef expression and offer a strategy for development of anti-HIV therapeutics to buttress our fight against HIV/AIDS.

Original languageEnglish
Pages (from-to)87-96
Number of pages10
JournalMolecular Cell
Volume33
Issue number1
DOIs
StatePublished - 16 Jan 2009

Keywords

  • HUMDISEASE
  • RNA

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