Oficjalska-Pham D, et al. (2006) General repression of RNA polymerase III transcription is triggered by protein phosphatase type 2A-mediated dephosphorylation of Maf1. Mol Cell 22(5):623-32
Abstract: We report genome-wide analyses that establish Maf1 as a general and direct repressor of yeast RNA polymerase (Pol) III transcription. Chromatin immunoprecipitation (ChIP) coupled to microarray hybridization experiments showed an increased association of Maf1 to Pol III-transcribed genes under repressing condition (rapamycin treatment) correlated with a dissociation of Brf1 and Pol III. Maf1 can exist in various phosphorylation states and interacts with Pol III in a dephosphorylated state. The largest subunit of Pol III, C160, was identified as a target of Maf1. Under repressing conditions, Maf1 is dephosphorylated and accumulates in the nucleus, and Pol III-Maf1 interaction increases. Mutations in protein phosphatase type 2A (PP2A) catalytic subunit-encoding genes prevented rapamycin-induced Maf1 dephosphorylation, its nuclear accumulation, and repression of Pol III transcription. The results indicate that Pol III transcription can be globally and rapidly downregulated via dephosphorylation and relocation of a general negative cofactor.
|Status: Published||Type: Journal Article||PubMed ID: 16762835|
Topics addressed in this paper
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|Topics||Topics not linked to Genes||Genes linked to topics (#1 - 10 )|
|Genomic co-immunoprecipitation study|
|Protein-Nucleic Acid Interactions|
|Topics||Genes linked to topics (#11 - 15 )|
|Protein Sequence Features|