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
中科院分区:
文献类型:
--
作者:
Kim KY;Levin DE
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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