Mpk1 MAPK association with the Paf1 complex blocks Sen1-mediated premature transcription termination.

Mpk1 MAPK association with the Paf1 complex blocks Sen1-mediated premature transcription termination.
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DOI:
10.1016/j.cell.2011.01.034
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发表时间:
2011-03-04
期刊:
影响因子:
64.5
通讯作者:
Levin DE
Levin DE
中科院分区:
生物学1区
文献类型:
--
作者:
Kim KY;Levin DE

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酵母细胞壁完整性途径的 Mpk1 MAPK 使用非催化机制,通过向目标启动子募集起始因子来激活应激诱导基因的转录。我们在此表明​​,Mpk1 在转录延伸中还具有功能,该功能也与其催化活性无关。该功能是通过 Mpk1 的对接位点与 Paf1C 延伸复合物的 Paf1 亚基中的 D 基序之间的相互作用介导的。 Paf1 中阻止这种相互作用的突变会导致 Mpk1 诱导基因的转录延伸出现特定缺陷,这是由于 Sen1 依赖性通过基因启动子近端区域内的 Nab3 结合位点提前终止所致。我们的研究结果揭示了一种调节机制,其中 Mpk1 通过阻止 Sen1-Nrd1-Nab3 终止复合物向延伸聚合酶的募集来克服转录衰减。最后,我们证明这种机制在人类 ERK5 MAPK 和人类 Paf1 之间的相互作用中是保守的。
The Mpk1 MAPK of the yeast cell wall integrity pathway uses a non-catalytic mechanism to activate transcription of stress-induced genes by recruitment of initiation factors to target promoters. We show here that Mpk1 additionally serves a function in transcription elongation that is also independent of its catalytic activity. This function is mediated by an interaction between the docking site of Mpk1 and a D motif in the Paf1 subunit of the Paf1C elongation complex. A mutation in Paf1 that blocks this interaction causes a specific defect in transcription elongation of an Mpk1-induced gene, which results from Sen1-dependent premature termination through a Nab3-binding site within the promoter-proximal region of the gene. Our findings reveal a regulatory mechanism in which Mpk1 overcomes transcriptional attenuation by blocking recruitment of the Sen1-Nrd1-Nab3 termination complex to the elongating polymerase. Finally, we demonstrate that this mechanism is conserved in an interaction between the human ERK5 MAPK and human Paf1.
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