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. 1995 May 23;92(11):5174–5178. doi: 10.1073/pnas.92.11.5174

A kinase-deficient transcription factor TFIIH is functional in basal and activated transcription.

T P Mäkelä 1, J D Parvin 1, J Kim 1, L J Huber 1, P A Sharp 1, R A Weinberg 1
PMCID: PMC41871  PMID: 7761469

Abstract

Phosphorylation of the carboxyl-terminal domain (CTD) of the large subunit of RNA polymerase II has been suggested to be critical for transcription initiation, activation, or elongation. A kinase activity specific for CTD is a component of the general transcription factor TFIIH. Recently, a cyclin-dependent kinase-activator kinase (MO15 and cyclin H) was found to be associated with TFIIH preparations and was suggested to be the CTD kinase. TFIIH preparations containing mutant, kinase-deficient MO15 lack CTD kinase activity, indicating that MO15 is critical for polymerase phosphorylation. Nonetheless, these mutant TFIIH preparations were fully functional (in vitro) in both basal and activated transcription. These results indicate that CTD phosphorylation is not required for transcription with a highly purified system.

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