HIV-1 Tat interacts with LIS1 protein.

HIV-1 Tat interacts with LIS1 protein.
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DOI:
10.1186/1742-4690-2-6
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发表时间:
2005-02-07
期刊:
影响因子:
3.3
通讯作者:
Nekhai S
Nekhai S
中科院分区:
医学2区
文献类型:
--
作者:
Epie N;Ammosova T;Sapir T;Voloshin Y;Lane WS;Turner W;Reiner O;Nekhai S

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HIV-1达特通过诱导RNA聚合酶II(RNAPII)的C-末端结构域(CTD)磷酸化来激活HIV-1病毒基因的转录。达特还可以通过抑制抗原特异性T淋巴细胞的增殖和通过诱导细胞凋亡来干扰细胞代谢。Tat诱导的T细胞凋亡部分归因于微管聚合的扭曲。LIS 1是一种促进微管聚合的微管相关蛋白。我们在这里确定LIS 1作为一个Tat相互作用的蛋白质在广泛的生化分馏的T细胞提取物。我们发现了几种蛋白质与Tat相关的RNAPII CTD激酶活性共纯化,包括LIS 1,CDK 7,细胞周期蛋白H和MAT 1。在体外,达特与LIS 1相互作用,但不与CDK 7、cyclin H和MAT 1相互作用。LIS 1还与HeLa细胞中表达的达特免疫共沉淀。此外,在酵母双杂交系统中,LIS 1与达特相互作用。我们的研究结果表明,达特与LIS 1在体外和体内的相互作用,这种相互作用可能有助于达特对微管形成的影响。
HIV-1 Tat activates transcription of HIV-1 viral genes by inducing phosphorylation of the C-terminal domain (CTD) of RNA polymerase II (RNAPII). Tat can also disturb cellular metabolism by inhibiting proliferation of antigen-specific T lymphocytes and by inducing cellular apoptosis. Tat-induced apoptosis of T-cells is attributed, in part, to the distortion of microtubules polymerization. LIS1 is a microtubule-associated protein that facilitates microtubule polymerization. We identified here LIS1 as a Tat-interacting protein during extensive biochemical fractionation of T-cell extracts. We found several proteins to co-purify with a Tat-associated RNAPII CTD kinase activity including LIS1, CDK7, cyclin H, and MAT1. Tat interacted with LIS1 but not with CDK7, cyclin H or MAT1 in vitro. LIS1 also co-immunoprecipitated with Tat expressed in HeLa cells. Further, LIS1 interacted with Tat in a yeast two-hybrid system. Our results indicate that Tat interacts with LIS1 in vitro and in vivo and that this interaction might contribute to the effect of Tat on microtubule formation.
DOI: 10.1186/1742-4690-2-5
发表时间: 2005-02-03
期刊: Retrovirology
影响因子: 3.3
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发表时间: 2001-07-01
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发表时间: 1999-07-30
影响因子: 5.6
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发表时间: 1996-11-05
期刊: BIOCHEMISTRY
影响因子: 2.9
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