Suppression of HIV-1 Nef translation by Sam68 mutant-induced stress granules and nef mRNA sequestration.
Suppression of HIV-1 Nef translation by Sam68 mutant-induced stress granules and nef mRNA sequestration.
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DOI:
10.1016/j.molcel.2008.11.024
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发表时间:
2009-01-16
期刊:
影响因子:
16
通讯作者:
He, Johnny J.
中科院分区:
文献类型:
--
作者:
Henao-Mejia, Jorge;Liu, Ying;Park, In-Woo;Zhang, Jizhong;Sanford, Jeremy;He, Johnny J.
HIV-1 Nef plays important roles in HIV-1 replication and pathogenesis. It is translated from completely spliced HIV-1 RNA, 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 aa269-321 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 down-regulation. Taken together, these results demonstrate that stress granule induction and nef mRNA sequestration account for this translational suppression of Nef expression and offers a new strategy for development of anti-HIV therapeutics to buttress our fight against HIV/AIDS.
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