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.
He, Johnny J.
中科院分区:
生物学1区
文献类型:
--
作者:
Henao-Mejia, Jorge;Liu, Ying;Park, In-Woo;Zhang, Jizhong;Sanford, Jeremy;He, Johnny J.

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HIV-1 Nef在HIV-1的复制和发病机制中起重要作用。它由完全剪接的HIV-1 RNA翻译而来,其表达在病毒DNA转录和RNA剪接水平上受到内在调控。在这里,我们表明,Sam 68细胞质突变体有力地抑制Nef表达。这种抑制需要Sam 68结构域aa 269 -321,并且与其诱导应激颗粒的能力相关。此外,这种抑制作用对Nef是特异性的,直接与nef mRNA 3′UTR结合赋予了这种抑制特异性。此外,nef mRNA被靶向并富集在这些诱导的应激颗粒中。重要的是,Nef抑制发生在CD 4 + T淋巴细胞的HIV-1感染的背景下,几乎没有MHC I和CD 4下调。总之,这些结果表明,应激颗粒诱导和nef mRNA螯合解释了Nef表达的这种翻译抑制,并为开发抗HIV治疗剂提供了新的策略,以支持我们对抗HIV/AIDS。
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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