Cdk9 regulates a promoter-proximal checkpoint to modulate RNA polymerase II elongation rate in fission yeast.

Cdk9 regulates a promoter-proximal checkpoint to modulate RNA polymerase II elongation rate in fission yeast.
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DOI:
10.1038/s41467-018-03006-4
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发表时间:
2018-02-07
影响因子:
16.6
通讯作者:
Lis JT
Lis JT
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Booth GT;Parua PK;Sansó M;Fisher RP;Lis JT

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Post-translational modifications of the transcription elongation complex provide mechanisms to fine-tune gene expression, yet their specific impacts on RNA polymerase II regulation remain difficult to ascertain. Here, in Schizosaccharomyces pombe, we examine the role of Cdk9, and related Mcs6/Cdk7 and Lsk1/Cdk12 kinases, on transcription at base-pair resolution with Precision Run-On sequencing (PRO-seq). Within a minute of Cdk9 inhibition, phosphorylation of Pol II-associated factor, Spt5 is undetectable. The effects of Cdk9 inhibition are more severe than inhibition of Cdk7 and Cdk12, resulting in a shift of Pol II toward the transcription start site (TSS). A time course of Cdk9 inhibition reveals that early transcribing Pol II can escape promoter-proximal regions, but with a severely reduced elongation rate of only ~400 bp/min. Our results in fission yeast suggest the existence of a conserved global regulatory checkpoint that requires Cdk9 kinase activity. While post-translational modifications of the RNA polymerase II complex regulate gene expression, the exact mechanism remains unknown. Here, the authors use altered-specificity kinase mutations to examine the role of Cdk9, Mcs6/Cdk7, and Lsk1/Cdk12 on transcription at base-pair resolution in yeast.
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