Switching Cdk2 on or off with small molecules to reveal requirements in human cell proliferation.

Switching Cdk2 on or off with small molecules to reveal requirements in human cell proliferation.
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DOI:
10.1016/j.molcel.2011.03.031
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发表时间:
2011-06-10
期刊:
影响因子:
16
通讯作者:
Fisher RP
Fisher RP
中科院分区:
生物学1区
文献类型:
--
作者:
Merrick KA;Wohlbold L;Zhang C;Allen JJ;Horiuchi D;Huskey NE;Goga A;Shokat KM;Fisher RP

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多种细胞周期蛋白依赖性激酶(CDKs)控制真核细胞分裂,但分配特定的功能,个别CDKs仍然是一个挑战。在哺乳动物细胞周期中,Cdk2在Cdk1之前形成活性复合物,但Cdk2蛋白的缺乏不会阻止细胞周期进程。为了检测正常表达水平被保留时人类细胞中Cdk2活性的要求和定义功能,并且防止其他CDK的非生理补偿,我们用对大体积腺嘌呤类似物的特异性抑制敏感的版本替换了野生型激酶。敏化突变也损害了Cdk2的非催化功能,限制组装的细胞周期蛋白A与Cdk1,但这种缺陷可以纠正抑制性和非抑制性类似物。这允许化学救援或选择性拮抗体内Cdk2活性,以揭示细胞增殖的要求,以及限制点通道和S期进入中的非冗余、限速作用。
Multiple cyclin-dependent kinases (CDKs) control eukaryotic cell division, but assigning specific functions to individual CDKs remains a challenge. During the mammalian cell cycle, Cdk2 forms active complexes before Cdk1, but lack of Cdk2 protein does not block cell-cycle progression. To detect requirements and define functions for Cdk2 activity in human cells when normal expression levels are preserved, and non-physiologic compensation by other CDKs is prevented, we replaced the wild-type kinase with a version sensitized to specific inhibition by bulky adenine analogs. The sensitizing mutation also impaired a non-catalytic function of Cdk2 in restricting assembly of cyclin A with Cdk1, but this defect could be corrected by both inhibitory and non-inhibitory analogs. This allowed either chemical rescue or selective antagonism of Cdk2 activity in vivo, to uncover a requirement in cell proliferation, and non-redundant, rate-limiting roles in restriction point passage and S-phase entry.
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