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Cell-cycle inhibition by independent CDK and PCNA binding domains in p21Cip1.

机译:p21Cip1中独立的CDK和PCNA结合域对细胞周期的抑制作用。

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摘要

Mammalian cell-cycle control by antimitogenic signals involves p21Cip1/WAF1 (refs 1-4), p27Kip1 (refs 5, 6) and p57Kip2 (refs 7, 8), a family of proteins that bind to and inhibit cyclin-dependent kinases (CDKs) required for initiation of S phase. The protein p21 also binds to the DNA polymerase delta processivity factor, proliferating-cell nuclear antigen (PCNA), and inhibits in vitro PCNA-dependent DNA replication. The CDK and PCNA inhibitory activities of p21 are shown here to be functionally independent and to reside in separate protein domains. The PCNA binding and inhibitory activities, which are not observed with p27 or p57, reside in the C-terminal domain of p21, whereas the CDK inhibitory activity resides in the conserved N-terminal domains of these proteins. When separately overexpressed in mammalian cells, the CDK and PCNA inhibitory domains prevent DNA replication, demonstrating a dual function of p21 as a cell-cycle inhibitor in vivo.
机译:通过抗有丝分裂原信号控制哺乳动物细胞周期涉及p21Cip1 / WAF1(参考1-4),p27Kip1(参考5、6)和p57Kip2(参考7、8),这是一种结合并抑制细胞周期蛋白依赖性激酶(CDKs)的蛋白质家族),以启动S相。蛋白p21还与DNA聚合酶δ增生因子,增殖细胞核抗原(PCNA)结合,并抑制体外PCNA依赖性DNA复制。 p21的CDK和PCNA抑制活性在功能上独立且位于单独的蛋白质结构域中。在p27或p57中未观察到的PCNA结合和抑制活性位于p21的C端结构域,而CDK抑制活性位于这些蛋白的保守N端结构域。当在哺乳动物细胞中分别过表达时,CDK和PCNA抑制域会阻止DNA复制,从而证明p21在体内具有细胞周期抑制剂的双重功能。

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