Latent HIV-1 TAR Regulates 7SK-responsive P-TEFb Target Genes and Targets Cellular Immune Responses in the Absence of Tat.

Latent HIV-1 TAR Regulates 7SK-responsive P-TEFb Target Genes and Targets Cellular Immune Responses in the Absence of Tat.
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DOI:
10.1016/j.gpb.2017.05.003
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发表时间:
2017-10
期刊:
Genomics, proteomics & bioinformatics
影响因子:
--
通讯作者:
Benecke AG
Benecke AG
中科院分区:
其他
文献类型:
--
作者:
Eilebrecht S;Benecke BJ;Benecke AG

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HIV-1转录本的反式激活反应元件(TAR)结构在非活性正转录延伸因子b(P-TEFb)向启动子近端暂停的RNA聚合酶II的募集中起关键作用。病毒反式激活因子TAT负责随后的P-TEFb激活,以启动有效的病毒转录延伸。在没有病毒转录反式激活因子(TAT)的情况下,例如在HIV转录的潜伏期或早期阶段,TAR介导P-TEFb与其抑制物六亚甲基双乙酰胺诱导蛋白1(HEXIM1)的相互作用,使P-TEFb保持不活跃的形式。在这项研究中,我们通过分析HIV-1TAR过表达对宿主细胞基因表达的影响来研究在没有TAT的情况下HIV-1TAR的功能。构建了由EB病毒表达的RNA 2(EBER2)和HIV-1 TAR组成的RNA嵌合体,以确保TAR在HEK293细胞中的高效表达。这种过度表达导致了800多个人类基因的差异表达。这些基因中有很大一部分涉及抑制细胞免疫反应,包括一组重要的7SK反应P-TEFb靶基因。我们的发现发现,在没有TAT的情况下,HIV-1TAR具有一个新的作用,涉及通过靶向7SK RNA介导的基因表达和P-TEFb失活来干扰宿主细胞免疫反应。
The transactivating response element (TAR) structure of the nascent HIV-1 transcript is critically involved in the recruitment of inactive positive transcription elongation factor b (P-TEFb) to the promoter proximal paused RNA polymerase II. The viral transactivator Tat is responsible for subsequent P-TEFb activation in order to start efficient viral transcription elongation. In the absence of the viral transactivator of transcription (Tat), e.g., during latency or in early stages of HIV transcription, TAR mediates an interaction of P-TEFb with its inhibitor hexamethylene bis-acetamide-inducible protein 1 (HEXIM1), keeping P-TEFb in its inactive form. In this study, we address the function of HIV-1 TAR in the absence of Tat by analyzing consequences of HIV-1 TAR overexpression on host cellular gene expression. An RNA chimera consisting of Epstein-Barr virus-expressed RNA 2 (EBER2) and HIV-1 TAR was developed to assure robust overexpression of TAR in HEK293 cells. The overexpression results in differential expression of more than 800 human genes. A significant proportion of these genes is involved in the suppression of cellular immune responses, including a significant set of 7SK-responsive P-TEFb target genes. Our findings identify a novel role for HIV-1 TAR in the absence of Tat, involving the interference with host cellular immune responses by targeting 7SK RNA-mediated gene expression and P-TEFb inactivation.
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