A cancer-derived mutation in the PSTAIRE helix of cyclin-dependent kinase 2 alters the stability of cyclin binding.

A cancer-derived mutation in the PSTAIRE helix of cyclin-dependent kinase 2 alters the stability of cyclin binding.
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细胞周期蛋白依赖性激酶 2 的 PSTAIRE 螺旋上的癌症突变改变了细胞周期蛋白结合的稳定性。

DOI:
10.1016/j.bbamcr.2010.04.004
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发表时间:
2010-07
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Mann DJ
Mann DJ
中科院分区:
其他
文献类型:
--
作者:
Child ES;Hendrychová T;McCague K;Futreal A;Otyepka M;Mann DJ

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细胞周期蛋白依赖性激酶2(cdk2)是哺乳动物细胞周期的重要调节因子。在这里,我们描述了一个突变形式的cdk2的性质,在大规模测序的蛋白激酶从癌组织中确定。该突变取代了PSTAIRE螺旋中的脯氨酸,这是cdk与其调节性细胞周期蛋白亚基相互作用的中心基序。我们证明,虽然突变cdk2在稳定的细胞周期蛋白协会是相当大的损害,它仍然能够产生一个活跃的激酶,可以在功能上弥补缺陷cdks在体内。分子动力学模拟和生物物理测量表明,所观察到的生化特性可能源于细胞周期蛋白结合螺旋内的灵活性增加。
Cyclin-dependent kinase 2 (cdk2) is a central regulator of the mammalian cell cycle. Here we describe the properties of a mutant form of cdk2 identified during large-scale sequencing of protein kinases from cancerous tissue. The mutation substituted a leucine for a proline in the PSTAIRE helix, the central motif in the interaction of the cdk with its regulatory cyclin subunit. We demonstrate that whilst the mutant cdk2 is considerably impaired in stable cyclin association, it is still able to generate an active kinase that can functionally complement defective cdks in vivo. Molecular dynamic simulations and biophysical measurements indicate that the observed biochemical properties likely stem from increased flexibility within the cyclin-binding helix.
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