CDK12 and Integrator-PP2A complex modulates LEO1 phosphorylation for processive transcription elongation.
CDK12 and Integrator-PP2A complex modulates LEO1 phosphorylation for processive transcription elongation.
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DOI:
10.1126/sciadv.adf8698
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发表时间:
2023-05-19
期刊:
影响因子:
13.6
通讯作者:
Liang K
中科院分区:
文献类型:
--
作者:
Qiu M;Yin Z;Wang H;Lei L;Li C;Cui Y;Dai R;Yang P;Xiang Y;Li Q;Lv J;Hu Z;Chen M;Zhou HB;Fang P;Xiao R;Liang K
Cyclin-dependent kinase 12 (CDK12) interacts with cyclin K to form a functional nuclear kinase that promotes processive transcription elongation through phosphorylation of the C-terminal domain of RNA polymerase II (Pol II). To gain a comprehensive understanding of CDK12's cellular function, we used chemical genetic and phosphoproteomic screening to identify a landscape of nuclear human CDK12 substrates, including regulators of transcription, chromatin organization, and RNA splicing. We further validated LEO1, a subunit of the polymerase-associated factor 1 complex (PAF1C), as a bona fide cellular substrate of CDK12. Acute depletion of LEO1, or substituting LEO1 phosphorylation sites with alanine, attenuated PAF1C association with elongating Pol II and impaired processive transcription elongation. Moreover, we discovered that LEO1 interacts with and is dephosphorylated by the Integrator-PP2A complex (INTAC) and that INTAC depletion promotes the association of PAF1C with Pol II. Together, this study reveals an uncharacterized role for CDK12 and INTAC in regulating LEO1 phosphorylation, providing important insights into gene transcription and its regulation. CDK12 phosphorylates the LEO1 subunit of PAF1 complex to promote transcription elongation.
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