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Reference: Garcia A, et al. (2010) Sub1 Globally Regulates RNA Polymerase II C-Terminal Domain Phosphorylation. Mol Cell Biol 30(21):5180-93

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Abstract

The transcriptional coactivator Sub1 has been implicated in several aspects of mRNA metabolism in yeast, such as activation of transcription, termination and 3' end formation. Here we present evidence that Sub1 plays a significant role in controlling phosphorylation of the RNA polymerase II large subunit C-terminal domain (CTD). We show that SUB1 genetically interacts with the genes encoding all four known CTD kinases: SRB10, KIN28, BUR1 and CTK1, suggesting that Sub1 acts to influence CTD phosphorylation at more than one step of the transcription cycle. To address this directly, we first used in vitro kinase assays and show that SUB1 deletion on the one hand increased CTD phosphorylation by Kin28, Bur1 and Ctk1, but on the other decreased CTD phosphorylation by Srb10. Second, chromatin immunoprecipitation assays revealed that SUB1 deletion decreased Srb10 chromatin association on the inducible GAL1 gene, but increased Kin28 and Ctk1 chromatin association on actively transcribed genes. Taken together, our data point to multiple roles for Sub1 in regulation of CTD phosphorylation throughout the transcription cycle.

Reference Type
Journal Article
Authors
Garcia A, Rosonina E, Manley JL, Calvo O
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