p53 and cell cycle dependent transcription of kinesin family member 23 (KIF23) is controlled via a CHR promoter element bound by DREAM and MMB complexes.

p53 and cell cycle dependent transcription of kinesin family member 23 (KIF23) is controlled via a CHR promoter element bound by DREAM and MMB complexes.
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DOI:
10.1371/journal.pone.0063187
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Rother K
Rother K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Fischer M;Grundke I;Sohr S;Quaas M;Hoffmann S;Knörck A;Gumhold C;Rother K

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微管依赖的分子马达KIF23 (Kinesin家族成员23)是中央纺锤体复合体在有丝分裂后期组装的两个组成部分之一。这种复合物的形成被认为是细胞质分裂的必要步骤。在这里,我们发现KIF23是肿瘤抑制蛋白p53的一个新的转录靶基因。我们发现p53降低了KIF23 mRNA的表达以及不同细胞类型的蛋白水平。启动子报告子实验显示,这种抑制是由KIF23启动子活性下调引起的。CDK抑制剂p21WAF1/CIP1被证明是介导p53依赖性抑制所必需的。此外,我们在KIF23启动子中发现了高度保守的细胞周期基因同源区(CHR),这是p53依赖性抑制和KIF23细胞周期依赖性表达所严格要求的。细胞周期和p53依赖性的KIF23调控似乎是由DREAM和MMB复合物与CHR元件的差异结合所控制的。通过这项研究,我们描述了KIF23转录调控的新机制。考虑到KIF23在细胞分裂中的强大支持功能,其p53依赖性抑制可能有助于预防不受控制的细胞生长。
The microtubule-dependent molecular motor KIF23 (Kinesin family member 23) is one of two components of the centralspindlin complex assembled during late stages of mitosis. Formation of this complex is known as an essential step for cytokinesis. Here, we identified KIF23 as a new transcriptional target gene of the tumor suppressor protein p53. We showed that p53 reduces expression of KIF23 on the mRNA as well as the protein level in different cell types. Promoter reporter assays revealed that this repression results from downregulation of KIF23 promoter activity. CDK inhibitor p21WAF1/CIP1 was shown to be necessary to mediate p53-dependent repression. Furthermore, we identified the highly conserved cell cycle genes homology region (CHR) in the KIF23 promoter to be strictly required for p53-dependent repression as well as for cell cycle-dependent expression of KIF23. Cell cycle- and p53-dependent regulation of KIF23 appeared to be controlled by differential binding of DREAM and MMB complexes to the CHR element. With this study, we describe a new mechanism for transcriptional regulation of KIF23. Considering the strongly supporting function of KIF23 in cytokinesis, its p53-dependent repression may contribute to the prevention of uncontrolled cell growth.
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