Human TFIIH Kinase CDK7 Regulates Transcription-Associated Chromatin Modifications.

Human TFIIH Kinase CDK7 Regulates Transcription-Associated Chromatin Modifications.
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人 TFIIH 激酶 CDK7 调节转录相关的染色质修饰。

DOI:
10.1016/j.celrep.2017.07.021
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发表时间:
2017-08-01
期刊:
影响因子:
8.8
通讯作者:
Taatjes DJ
Taatjes DJ
中科院分区:
生物学1区
文献类型:
--
作者:
Ebmeier CC;Erickson B;Allen BL;Allen MA;Kim H;Fong N;Jacobsen JR;Liang K;Shilatifard A;Dowell RD;Old WM;Bentley DL;Taatjes DJ

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CDK7磷酸化RNA聚合酶II (pol II) CTD并激活p - tefb相关激酶CDK9,但其调控作用尚不清楚。在这里,使用人类CDK7类似物敏感(CDK7as)细胞,我们观察到封盖酶募集减少,pol II启动子近端暂停增加,以及CDK7抑制后基因3 '端终止缺陷。我们还注意到CDK7调节转录起始位点下游的染色质修饰。在CDK7as细胞中,H3K4me3在基因5 ' -末端的扩散受到限制,H3K36me3向基因3 ' -末端转移。质谱鉴定了结合tfiih磷酸化与p - tefb磷酸化的CTD的因素(与未修饰的对照);capping酶和H3K4甲基转移酶复合物SETD1A/B选择性结合磷酸化的CTD,而H3K36甲基转移酶SETD2特异性结合p - tefb磷酸化的CTD。此外,tfiih磷酸化的CTD刺激了SETD1A/B对核小体的活性,揭示了CDK7调控H3K4me3扩散的机制基础。总的来说,这些结果暗示了一个依赖cdk7的“CTD代码”,除了RNA加工和pol II暂停外,还调节染色质标记。
CDK7 phosphorylates the RNA polymerase II (pol II) CTD and activates the P-TEFb-associated kinase, CDK9, but its regulatory roles remain obscure. Here, using human CDK7 analog-sensitive (CDK7as) cells, we observed reduced capping enzyme recruitment, increased pol II promoter-proximal pausing, and defective termination at gene 3′-ends upon CDK7 inhibition. We also noted CDK7 regulates chromatin modifications downstream of transcription start sites. H3K4me3 spreading was restricted at gene 5′-ends and H3K36me3 was displaced toward gene 3′-ends in CDK7as cells. Mass spectrometry identified factors that bound TFIIH-phosphorylated vs. P-TEFb-phosphorylated CTD (vs. unmodified); capping enzymes and H3K4 methyltransferase complexes, SETD1A/B, selectively bound phosphorylated CTD and the H3K36 methyltransferase SETD2 specifically bound P-TEFb-phosphorylated CTD. Moreover, TFIIH-phosphorylated CTD stimulated SETD1A/B activity toward nucleosomes, revealing a mechanistic basis for CDK7 regulation of H3K4me3 spreading. Collectively, these results implicate a CDK7-dependent “CTD code” that regulates chromatin marks in addition to RNA processing and pol II pausing.
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