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. 1996 Apr 15;15(8):1877–1884.

MAT1, cdk7 and cyclin H form a kinase complex which is UV light-sensitive upon association with TFIIH.

J P Adamczewski 1, M Rossignol 1, J P Tassan 1, E A Nigg 1, V Moncollin 1, J M Egly 1
PMCID: PMC450106  PMID: 8617234

Abstract

MAT1, cyclin H and cdk7 are part of TFIIH, a class II transcription factor which possesses numerous subunits of which several have been shown to be involved in processes other than transcription. Two of them, XPD (ERCC2) and XPB (ERCC3), are helicases involved in nucleotide excision repair (NER), whereas cdk7, cyclin H and MAT1 are thought to participate in cell cycle regulation. MAT1, cyclin H and cdk7 exist as a ternary complex either free or associated with TFIIH from which the latter can be dissociated at high salt concentration. MAT1 is strongly associated with cdk7 and cyclin H. Although not strictly required for the formation and activity of the complex, it stimulates its kinase activity. The kinase activity of TFIIH, which is constant during the cell cycle, is reduced after UV light irradiation.

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