Azu-1及PinX1蛋白质在细胞有丝分裂中的功能解析
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摘要
在动物细胞中,中心体是主要的微管组织中心,它在细胞极性的产生,胞间运输以及细胞分裂过程中发挥着重要作用。细胞通过调控中心体的正常复制与分离,可以防止细胞分裂时染色体的异常分离。当中心体功能出现障碍时,往往伴随染色体分离异常,从而导致癌症的发生。
     作为Aurora serine/threonine蛋白激酶家族的成员之一,Aurora A定位于中心体,在细胞有丝分裂过程中,调节中心体的成熟和双极纺锤体的组装。Aurora A的缺失会导致中心粒的分离出现问题,或者令染色体不能正确的排列到赤道板上。最近的研究的发现,在果蝇和爪蟾系统中,Aurora A能够磷酸化TACC(Transforming acidic coiled coil)蛋白,并招募TACC蛋白到中心体上,与微管结合蛋白一起参与调控中心体微管的稳定性。人类存在三种TACC蛋白(TACC1、TACC2和TACC3),其中TACC3已经被证明能够被Aurora A磷酸化,而有关于TACC2的报道却很少。在这里,我们主要研究了人类TACC家族中的Azu-1(anti-zuai-1),它是TACC2蛋白的异构体。我们的研究结果表明Azu-1通过其N端与Aurora A相互作用,Azu-1与Aurora A在有丝分裂期的HeLa细胞中共定位于中心体,并且Azu-1能够被Aurora A磷酸化,这个磷酸酸化事件对于Azu-1定位到中心体上是相当重要的。
     另一方面,在细胞分裂过程中,从DNA的复制到染色体的配对,以及与微管相互作用,到最后正确分离到子代细胞,这一系列重要事件都受到细胞周期检验点的精密监视及调控。而当染色体出现错误时或者动点没有完全被微管捕获时,纺锤体装配检验点(Spindle assembly checkpoint)被激活。随后一系列信号转导事件将修正染色体动点与微管之间不正确的连接,最后动点完全正确的排列在赤道板上,细胞周期得以从中期进入后期。纺锤体装配检验点可以保证染色体正确分离。从最简单的单细胞真核生物酵母,到复杂的后生生物,例如我们人类自己,这些进行调控的分子事件都是高度保守的。
     PinX1是一个潜在的间期端粒酶抑制因子,它在细胞有丝分裂期中的报道很少。在这里我们证明了PinX1在染色体的正常分离过程中起着很重要的作用。去卷积显微镜观察结果显示PinX1在间期时定位于核仁和端粒,在有丝分裂期时定位于染色体周边以及动点上。我们设计的缺失突变体实验证明了PinX1的动点定位依赖于它的中间区域,而染色体周边的定位依赖于它的C端。有趣的是,PinX1的动点定位依赖于Hec1和CENP-E,同时我们的生化数据显示PinX1是一个重要的微管结合蛋白。我们的实时图像分析表明在抑制了PinX1的表达后,染色体不能正常的排列到赤道板上,导致有丝分裂期染色体桥以及间期小核的发生,意味着PinX1在染色体稳定性方面所起的作用。另外,我们还找到了PinX1的结合蛋白Nucleolin,它是一个染色体周边蛋白,通过PinX1的C端与PinX1相互作用。去卷积显微镜结果显示在前中期时,PinX1主要与Nucleolin共定位于染色体周边。更进一步的研究发现,Nucleolin的缺失会破坏PinX1的染色体周边定位,暗示着PinX1与Nucleolin在功能上的相互关系。实时图像数据表明,当PinX1和Nucleolin的表达同时被抑制时,染色体的分离不能正常进行。我们认为PinX1能够被Nucleolin招募到染色体周边,而PinX1和Nucleolin复合物对于染色体正常排列到赤道板这个过程中起着重要作用。
In animal cells, centrosome, also called microtubule organization center (MTOC), plays an important part in plasticity of cell polarity, assists with introcellular transporting and participates in the management of mitotic behaviors. Accurate replication and segregation of centrosomes are the premises of daughter cell division, avoiding false separation of chromosomes. Thus, centrosome abnormalities can lead to chromosome instability and cancer.
     As a member of Aurora serine/threonine kinase family, Aurora A plays a significant role in maturation of centrosomes and assembly of bipolar spindles related to its centrosome localization during mitosis. Suppression of Aurora A causes errors when centriole pairs separate, or chromosomes congress to the spindle equator. Recently, Xenopus and Drosophila transforming acidic coiled coil (TACC) proteins have been found to be the substrates of Aurora A. After phosphorylation by Aurora A, TACC proteins are recruited to centrosomes, and then contribute to modulating centrosomal microtubule stability with microtubule associated proteins. Three TACC proteins (TACC1, TACC2, TACC3) exist in human, and TACC3 has been proved to be phosphorylated by Aurora A. However little is known about TACC2. In this study, we focus on anti-zuai-1 (Azu-1), which is identified as an isoform of TACC2. We have demonstrated that Azu-1 interacts with Aurora A through its N-terminal region and co-localizes with Aurora A at centrosomes in mitotic HeLa cells. Moreover, Azu-1 can be phosphorylated by Aurora A kinase and the phosphorylation is essential for centrosomal localization of Azu-1.
     On the other hand, most of the important things, comprising DNA’s replication, interaction of chromosomes with microtubules and accurate segregation to the daughter cells, are monitored by the cell cycle checkpoint in the procession of cell division. When error occurs, spindle assembly checkpoint will be activated, which assures that kinetochore could align precisely on the equatorial plate and cell cycle continues from metaphase to anaphase. Spindle assembly checkpoint warrants the exact separation of chromosomes. Mechanisms concerning these cell cycle events are conserved from the simple mono-cell eukaryote to the complicated metazoan.
     PinX1 is a potent telomerase inhibitor in interphase; however, its function in mitosis is not well documented. Here we show that PinX1 is essential for faithful chromosome segregation. Deconvolution microscopic analyses show that PinX1 localizes to nucleoli and telomeres in interphase and relocates to the periphery of chromosomes and outer plate of the kinetochores in mitosis. Our deletion analyses mapped PinX1’s kinetochore localization domain to the central region and its chromosome periphery localization domain to the C terminus. Interestingly, the kinetochore localization of PinX1 is dependent on Hec1 and CENP-E. Our biochemical characterization revealed that PinX1 is a novel microtubule-binding protein. Our real-time imaging analyses show that suppression of PinX1 by small interference RNA abrogates faithful chromosome segregation and results in anaphase chromatid bridges in mitosis and micronuclei in interphase, suggesting an essential role of PinX1 in chromosome stability. Furthermore we report that PinX1 interacts with Nucleolin, a chromosome periphery protein, through its C-termini. Deconvolution microscopic analyses show PinX1 mainly co-localizes with Nucleolin at chromosome periphery in prometaphase. Moreover, depletion of Nucleolin abolishes chromosome periphery localizations of PinX1, suggesting a functional interrelationship between PinX1 and Nucleolin. Importantly, repression of PinX1 and Nucleolin abrogates chromosome segregation in real-time mitosis, validating the functional importance of PinX1-Nucleolin interaction. We propose PinX1 is recruited to chromosome periphery by Nucleolin and a complex of PinX1 and Nucleolin is essential for faithful chromosome congression.
引文
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