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Inhibition of P-TEFb (CDK9/Cyclin T) Kinase and RNA Polymerase II Transcription by the Coordinated Actions of HEXIM1 and 7SK snRNA

The positive transcriptional elongation factor b (P-TEFb), consisting of CDK9 and cyclin T, stimulates transcription by phosphorylating RNA polymerase II. It becomes inactivated when associated with the abundant 7SK snRNA. Here, we show that the 7SK binding alone was not sufficient to inhibit P-TEFb...

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Published in:Molecular cell 2003-10, Vol.12 (4), p.971-982
Main Authors: Yik, Jasper H.N, Chen, Ruichuan, Nishimura, Rieko, Jennings, Jennifer L, Link, Andrew J, Zhou, Qiang
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creator Yik, Jasper H.N
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Zhou, Qiang
description The positive transcriptional elongation factor b (P-TEFb), consisting of CDK9 and cyclin T, stimulates transcription by phosphorylating RNA polymerase II. It becomes inactivated when associated with the abundant 7SK snRNA. Here, we show that the 7SK binding alone was not sufficient to inhibit P-TEFb. P-TEFb was inhibited by the HEXIM1 protein in a process that specifically required 7SK for mediating the HEXIM1:P-TEFb interaction. This allowed HEXIM1 to inhibit transcription both in vivo and in vitro. P-TEFb dissociated from HEXIM1 and 7SK in cells undergoing stress response, increasing the level of active P-TEFb for stress-induced transcription. P-TEFb was the predominant HEXIM1-associated protein factor, and thus likely to be the principal target of inhibition coordinated by HEXIM1 and 7SK. Since HEXIM1 expression is induced in cells treated with hexamethylene bisacetamide, a potent inducer of cell differentiation, targeting the general transcription factor P-TEFb by HEXIM1/7SK may contribute to the global control of cell growth and differentiation.
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subjects Acetamides - pharmacology
Binding Sites - genetics
Gene Expression Regulation, Enzymologic - drug effects
Gene Expression Regulation, Enzymologic - genetics
HeLa Cells
hexamethylene bisacetamide
HEXIM1 gene
Humans
P-TEF3b protein
Positive Transcriptional Elongation Factor B - antagonists & inhibitors
Positive Transcriptional Elongation Factor B - genetics
Positive Transcriptional Elongation Factor B - metabolism
RNA Polymerase II - genetics
RNA Polymerase II - metabolism
RNA, Small Nuclear - genetics
RNA-Binding Proteins - genetics
RNA-Binding Proteins - metabolism
RNA-Binding Proteins - pharmacology
snRNA 7SK
Stress, Physiological - chemically induced
Stress, Physiological - enzymology
Stress, Physiological - genetics
Transcription, Genetic - drug effects
Transcription, Genetic - genetics
title Inhibition of P-TEFb (CDK9/Cyclin T) Kinase and RNA Polymerase II Transcription by the Coordinated Actions of HEXIM1 and 7SK snRNA
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