HIV-1 Tat impairs cell cycle control by targeting the Tip60, Plk1 and cyclin B1 ternary complex

HIV-1 Tat impairs cell cycle control by targeting the Tip60, Plk1 and cyclin B1 ternary complex
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HIV-1 Tat 通过靶向 Tip60、Plk1 和细胞周期蛋白 B1 三元复合物损害细胞周期控制

DOI:
10.4161/cc.11.6.19664
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发表时间:
2012-03
期刊:
影响因子:
4.3
通讯作者:
Zhou Ping-Kun
Zhou Ping-Kun
中科院分区:
生物学3区
文献类型:
--
作者:
Shi-Meng Zhang;Maoyong Song;Tian-Yi Yang;Rong Fan;Xiao-Dan Liu;Zhou Ping-Kun

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HIV-1达特在感染和未感染细胞中触发内源性和外源性凋亡途径,在艾滋病的发病机制中起重要作用。Tip 60是达特的一种相互作用蛋白,敲低Tip 60可导致细胞周期进程受损,表明Tip 60在细胞周期调控中起关键作用。我们发现Tip 60通过其ZnFMYST结构域与Plk 1相互作用,并且这种相互作用在G2/M期增强。此外,细胞周期蛋白B1被证实与Tip 60的ZnF结构域相互作用。免疫荧光成像显示,Tip 60共定位与Plk 1和细胞周期蛋白B1在中心体在有丝分裂期和中间体在胞质分裂。进一步的实验表明,Tip 60与Plk 1和细胞周期蛋白B1形成三元复合物,乙酰化Plk 1,但不乙酰化细胞周期蛋白B1。HIV-1达特可能与Tip 60、细胞周期蛋白B1和Plk 1形成四元复合物。荧光显微镜观察显示,达特引起细胞周期蛋白B1和Plk 1的非程序性核转位,导致它们与Tip 60在细胞核中共定位。达特、Tip 60、细胞周期蛋白B1和Plk 1相互作用为Tat介导的细胞周期失调和细胞凋亡提供了新的机制解释。
HIV-1 Tat triggers intrinsic and extrinsic apoptosis pathways in both infected and uninfected cells and plays an important role in the pathogenesis of AIDS. Knocking down Tip60, an interactive protein of Tat, leads to the impairment of cell cycle progression, indicating a key role of Tip60 in cell cycle control. We found that Tip60 interacts with Plk1 through its ZnFMYST domain, and that this interaction is enhanced in the G2/M phase. In addition, cyclin B1 was confirmed to interact with the ZnF domain of Tip60. Immunofluorescence imaging showed that Tip60 co-localizes with both Plk1 and cyclin B1 at the centrosome during the mitotic phase and to the mid-body during cytokinesis. Further experiments revealed that Tip60 forms a ternary complex with Plk1 and cyclin B1 and acetylates Plk1 but not cyclin B1. HIV-1 Tat likely forms a quaternary complex with Tip60, cyclin B1 and Plk1. Fluorescent microscopy showed that Tat causes an unscheduled nuclear translocation of both cyclin B1 and Plk1, causing their co-localization with Tip60 in the nucleus. Tat, Tip60, cyclin B1 and Plk1 interactions provide new a mechanistic explanation for Tat-mediated cell cycle dysregulation and apoptosis.
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发表时间: 1997-01-21
影响因子: 11.1
作者:
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