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• W1971725412 abstract "Elongation of transcription by mammalian RNA polymerase II (RNAPII) is regulated by specific factors, including transcription factor IIS (TFIIS) and positive transcription elongation factor b (P-TEFb). We show that the E3 ubiquitin ligase UBR5 associates with the CDK9 subunit of positive transcription elongation factor b to mediate its polyubiquitination in human cells. TFIIS also binds UBR5 to stimulate CDK9 polyubiquitination. Co-localization of UBR5, CDK9, and TFIIS along specific regions of the γ fibrinogen (γFBG) gene indicates that a ternary complex involving these factors participates in the transcriptional regulation of this gene. In support of this notion, overexpression of TFIIS not only modifies the ubiquitination pattern of CDK9 in vivo but also increases the association of CDK9 with various regions of the γFBG gene. Notably, the TFIIS-mediated increase in CDK9 loading is obtained during both basal and activated transcription of the γFBG gene. This increased CDK9 binding is paralleled by an increase in the recruitment of RNAPII along the γFBG gene and the phosphorylation of the C-terminal domain of the RNAPII largest subunit RPB1 on Ser-2, a known target of CDK9. Together, these results identify UBR5 as a novel E3 ligase that regulates transcription and define an additional function of TFIIS in the regulation of CDK9." @default.
• W1971725412 created "2016-06-24" @default.
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• W1971725412 date "2011-02-01" @default.
• W1971725412 modified "2023-09-26" @default.
• W1971725412 title "Transcription Factor IIS Cooperates with the E3 Ligase UBR5 to Ubiquitinate the CDK9 Subunit of the Positive Transcription Elongation Factor B" @default.
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• W1971725412 doi "https://doi.org/10.1074/jbc.m110.176628" @default.
• W1971725412 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3037613" @default.
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