Integrator Recruits Protein Phosphatase 2A to Prevent Pause Release and Facilitate Transcription Termination.

Integrator Recruits Protein Phosphatase 2A to Prevent Pause Release and Facilitate Transcription Termination.
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DOI:
10.1016/j.molcel.2020.08.016
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发表时间:
2020-10-15
期刊:
影响因子:
16
通讯作者:
Wagner EJ
Wagner EJ
中科院分区:
生物学1区
文献类型:
--
作者:
Huang KL;Jee D;Stein CB;Elrod ND;Henriques T;Mascibroda LG;Baillat D;Russell WK;Adelman K;Wagner EJ

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启动子近端暂停的Pol II的有效释放进入生产性延伸是基因表达所必需的。最近,我们报道了整合子复合体可以结合暂停的POL II并驱动提前转录终止,从而有效地减弱靶基因的活性。过早终止需要整合子核酸内切酶亚基的切割,但其他整合子亚基在基因调控中的作用尚不清楚。在这里,我们报告了整合子亚单位8(IntS8)对于转录抑制是关键的,并且是与蛋白磷酸酶2A(PP2A)结合所必需的。我们发现,整合子结合的PP2A使Pol II的C-末端结构域和Spt5去磷酸化,并阻止向生产性延伸的转变。因此,阻断PP2A与整合子的关联可以刺激暂停释放和基因激活。这些结果揭示了与整合子介导的转录终止相关的第二种催化功能,并提出了一个涉及转录激酶和磷酸酶之间的主动竞争的生产性延伸控制模型。整合子复合体结合启动子近端暂停的POL II,并驱动提前转录终止。Huang等人的研究成果。确定了整合子亚单位8(INTS8)中的一个基序,该基序将蛋白磷酸酶2A(PP2A)招募到POL II。整合蛋白PP2A然后使Spt5和POL II CTD中的残基去磷酸化,以抑制暂停释放并促进终止。
Efficient release of promoter-proximally paused Pol II into productive elongation is essential for gene expression. Recently, we reported that the Integrator complex can bind paused Pol II and drive premature transcription termination, potently attenuating the activity of target genes. Premature termination requires RNA cleavage by the endonuclease subunit of Integrator, but the roles of other Integrator subunits in gene regulation have yet to be elucidated. Here, we report that Integrator subunit 8 (IntS8) is critical for transcription repression and is required for association with Protein Phosphatase 2A (PP2A). We find that Integrator-bound PP2A dephosphorylates the Pol II C-terminal domain and Spt5 and prevents the transition to productive elongation. Blocking PP2A association with Integrator thus stimulates pause release and gene activation. These results reveal a second catalytic function associated with Integrator-mediated transcription termination and suggest a model for the control of productive elongation involving active competition between transcriptional kinases and phosphatases. The Integrator Complex binds promoter-proximally paused Pol II and drives premature transcription termination. Huang et al. identified a motif within Integrator subunit 8 (INTS8) that recruits Protein Phosphatase 2A (PP2A) to Pol II. Integrator-PP2A then dephosphorylates residues within Spt5 and the Pol II CTD to inhibit pause release and facilitate termination.
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