Bovine HEXIM1 inhibits bovine immunodeficiency virus replication through regulating BTat-mediated transactivation.

Bovine HEXIM1 inhibits bovine immunodeficiency virus replication through regulating BTat-mediated transactivation.
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牛 HEXIM1 通过调节 BTat 介导的反式激活抑制牛免疫缺陷病毒复制

DOI:
10.1186/1297-9716-44-21
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发表时间:
2013-03-27
影响因子:
4.4
通讯作者:
Tan J
Tan J
中科院分区:
农林科学2区
文献类型:
--
作者:
Guo HY;Ma YG;Gai YM;Liang ZB;Ma J;Su Y;Zhang QC;Chen QM;Tan J

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牛免疫缺陷病毒(BIV)反式激活因子(BTat)将牛细胞周期蛋白T1(B-cyclin T1)募集到LTR以促进BIV的转录。在这里,我们证明了牛双乙酰胺(HMBA)诱导蛋白1(BHEXIM 1)抑制BTat介导的BIV LTR转录。体内和体外试验的结果显示BHEXIM 1与B-细胞周期蛋白T1直接结合。这些结果表明,抑制来自BHEXIM 1-BTat竞争B-细胞周期蛋白T1,这使得BHEXIM 1取代BTat从B-细胞周期蛋白T1。此外,我们发现BHEXIM 1的C-末端区域和中心区域是BHEXIM 1与B-cyclin T1结合所必需的。BHEXIM 1的敲低增强BIV复制。综上所述,我们的研究提供了第一个明确的证据,BHEXIM 1通过调节BTat介导的反式激活参与BIV复制。
The bovine immunodeficiency virus (BIV) transactivator (BTat) recruits the bovine cyclin T1 (B-cyclin T1) to the LTR to facilitate the transcription of BIV. Here, we demonstrate that bovine hexamethylene bisacetamide (HMBA)-induced protein 1 (BHEXIM1) inhibits BTat-mediated BIV LTR transcription. The results of in vivo and in vitro assays show direct binding of BHEXIM1 to the B-cyclin T1. These results suggest that the repression arises from BHEXIM1-BTat competition for B-cyclin T1, which allows BHEXIM1 to displace BTat from B-cyclin T1. Furthermore, we found that the C-terminal region and the centrally located region of BHEXIM1 are required for BHEXIM1 to associate with B-cyclin T1. Knockdown of BHEXIM1 enhances BIV replication. Taken together, our study provides the first clear evidence that BHEXIM1 is involved in BIV replication through regulating BTat-mediated transactivation.
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