The transcriptional co-activator PCAF regulates cdk2 activity.

The transcriptional co-activator PCAF regulates cdk2 activity.
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DOI:
10.1093/nar/gkp777
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发表时间:
2009-11
影响因子:
14.9
通讯作者:
Bachs O
Bachs O
中科院分区:
生物学2区
文献类型:
--
作者:
Mateo F;Vidal-Laliena M;Canela N;Zecchin A;Martínez-Balbás M;Agell N;Giacca M;Pujol MJ;Bachs O

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细胞周期蛋白依赖性激酶(cdks)调节细胞周期进程和转录。我们在这里报告,转录辅激活因子PCAF直接与cdk 2相互作用。这种相互作用主要发生在细胞周期的S期和G2/M期。作为这种关联的结果,PCAF抑制细胞周期蛋白/cdk 2复合物的活性。这种作用是cdk 2特异性的,因为PCAF不抑制细胞周期蛋白D3/cdk 6或细胞周期蛋白B/cdk 1的活性。这种抑制作用既不与ATP竞争,也不与底物组蛋白H1竞争,这表明PCAF以某种方式干扰了细胞周期蛋白/cdk 2复合物。我们还证明,PCAF在细胞中的过表达抑制cdk 2活性,并在S和G2/M期阻滞细胞周期进程。这种阻断依赖于cdk 2,因为它是由这种激酶的同时过表达拯救的。此外,我们还观察到PCAF在赖氨酸33处乙酰化cdk 2。由于该赖氨酸对于与ATP的相互作用是必需的,因此该残基的乙酰化抑制cdk 2活性。因此,我们在这里报告,PCAF抑制细胞周期蛋白/cdk 2活性的两种不同的机制:(i)通过某种方式影响细胞周期蛋白/cdk 2的相互作用和(ii)通过乙酰化K33在cdk 2的催化口袋。这些发现确定了一种以前未知的调节cdk 2活性的机制。
Cyclin dependent kinases (cdks) regulate cell cycle progression and transcription. We report here that the transcriptional co-activator PCAF directly interacts with cdk2. This interaction is mainly produced during S and G2/M phases of the cell cycle. As a consequence of this association, PCAF inhibits the activity of cyclin/cdk2 complexes. This effect is specific for cdk2 because PCAF does not inhibit either cyclin D3/cdk6 or cyclin B/cdk1 activities. The inhibition is neither competitive with ATP, nor with the substrate histone H1 suggesting that somehow PCAF disturbs cyclin/cdk2 complexes. We also demonstrate that overexpression of PCAF in the cells inhibits cdk2 activity and arrests cell cycle progression at S and G2/M. This blockade is dependent on cdk2 because it is rescued by the simultaneous overexpression of this kinase. Moreover, we also observed that PCAF acetylates cdk2 at lysine 33. As this lysine is essential for the interaction with ATP, acetylation of this residue inhibits cdk2 activity. Thus, we report here that PCAF inhibits cyclin/cdk2 activity by two different mechanisms: (i) by somehow affecting cyclin/cdk2 interaction and (ii) by acetylating K33 at the catalytic pocket of cdk2. These findings identify a previously unknown mechanism that regulates cdk2 activity.
DOI: 10.1038/onc.2009.127
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