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DNA复制起始蛋白ORC1和CDC6在细胞周期蛋白E基因转录调控中的相反作用。

Opposing roles for DNA replication initiator proteins ORC1 and CDC6 in control of Cyclin E gene transcription.

作者信息

Hossain Manzar, Stillman Bruce

机构信息

Cold Spring Harbor Laboratory, Cold Spring Harbor, United States.

出版信息

Elife. 2016 Jul 26;5:e12785. doi: 10.7554/eLife.12785.

Abstract

Newly born cells either continue to proliferate or exit the cell division cycle. This decision involves delaying expression of Cyclin E that promotes DNA replication. ORC1, the Origin Recognition Complex (ORC) large subunit, is inherited into newly born cells after it binds to condensing chromosomes during the preceding mitosis. We demonstrate that ORC1 represses Cyclin E gene (CCNE1) transcription, an E2F1 activated gene that is also repressed by the Retinoblastoma (RB) protein. ORC1 binds to RB, the histone methyltransferase SUV39H1 and to its repressive histone H3K9me3 mark. ORC1 cooperates with SUV39H1 and RB protein to repress E2F1-dependent CCNE1 transcription. In contrast, the ORC1-related replication protein CDC6 binds Cyclin E-CDK2 kinase and in a feedback loop removes RB from ORC1, thereby hyper-activating CCNE1 transcription. The opposing effects of ORC1 and CDC6 in controlling the level of Cyclin E ensures genome stability and a mechanism for linking directly DNA replication and cell division commitment.

摘要

新生成的细胞要么继续增殖,要么退出细胞分裂周期。这一决定涉及延迟促进DNA复制的细胞周期蛋白E的表达。ORC1,即起始识别复合物(ORC)的大亚基,在前一个有丝分裂过程中与浓缩染色体结合后,会遗传到新生成的细胞中。我们证明,ORC1抑制细胞周期蛋白E基因(CCNE1)的转录,CCNE1是一个E2F1激活的基因,也受到视网膜母细胞瘤(RB)蛋白的抑制。ORC1与RB、组蛋白甲基转移酶SUV39H1及其抑制性组蛋白H3K9me3标记结合。ORC1与SUV39H1和RB蛋白协同抑制E2F1依赖的CCNE1转录。相反,与ORC1相关的复制蛋白CDC6结合细胞周期蛋白E-CDK2激酶,并通过一个反馈环将RB从ORC1上移除,从而过度激活CCNE1转录。ORC1和CDC6在控制细胞周期蛋白E水平上的相反作用确保了基因组稳定性,以及一种直接连接DNA复制和细胞分裂承诺的机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a6a9/4987141/0cf968f7d088/elife-12785-fig1.jpg

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