Not1 mediates recruitment of the deadenylase Caf1 to mRNAs targeted for degradation by tristetraprolin.

Not1 mediates recruitment of the deadenylase Caf1 to mRNAs targeted for degradation by tristetraprolin.
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DOI:
10.1093/nar/gkr011
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发表时间:
2011-05
影响因子:
14.9
通讯作者:
Stoecklin G
Stoecklin G
中科院分区:
生物学2区
文献类型:
--
作者:
Sandler H;Kreth J;Timmers HT;Stoecklin G

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碳分解代谢抑制蛋白4 (Ccr4) - TATA (Not)复合体的阴性基因在两个水平上控制着基因的表达。在细胞核中,它调节基础转录机制、核受体介导的转录和组蛋白修饰。在细胞质中,该复合体是信使RNA (mRNA)通过其两个相关的死烯酶Ccr4和Caf1进行转换所必需的。Not1是Ccr4-Not复合体中最大的蛋白,并作为该复合体其他亚基的支架。在这里,我们提供的证据表明,人类细胞质中的Not1与三戊三醇(TTP)的c端结构域相关,TTP是一种RNA结合蛋白,可介导含有富au元素(AREs)的mrna的快速降解。Not1通过其中心区域与TTP表现出广泛的相互作用,而Caf1的结合仅限于Not1内较小的中心区域。重要的是,are - mrna的快速衰变需要Not1,而TTP仅在Not1存在的情况下才能招募Caf1死基化酶。因此,细胞质Not1提供了一个平台,允许特定的RNA结合蛋白募集Caf1死基化酶,从而触发其靶mrna的衰变。
The carbon catabolite repressor protein 4 (Ccr4)–Negative on TATA (Not) complex controls gene expression at two levels. In the nucleus, it regulates the basal transcription machinery, nuclear receptor-mediated transcription and histone modifications. In the cytoplasm, the complex is required for messenger RNA (mRNA) turnover through its two associated deadenylases, Ccr4 and Caf1. Not1 is the largest protein of the Ccr4–Not complex and serves as a scaffold for other subunits of the complex. Here, we provide evidence that human Not1 in the cytoplasm associates with the C-terminal domain of tristetraprolin (TTP), an RNA binding protein that mediates rapid degradation of mRNAs containing AU-rich elements (AREs). Not1 shows extensive interaction through its central region with TTP, whereas binding of Caf1 is restricted to a smaller central domain within Not1. Importantly, Not1 is required for the rapid decay of ARE-mRNAs, and TTP can recruit the Caf1 deadenylase only in presence of Not1. Thus, cytoplasmic Not1 provides a platform that allows a specific RNA binding protein to recruit the Caf1 deadenylase and thereby trigger decay of its target mRNAs.
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