Chapter Category: Cell Cycle

From the book The CDK-Activating Kinase (CAK)

Activation of CDKs by CAK: CAK in TFIIH

Anne Keriel and Jean-Marc Egly

TFIIH was originally identified as a basal transcription factor involved in protein-coding genes transcription. The systematic cloning of its nine subunits revealed however that TFIIH also participates in two other fundamental cell processes: cell cycle regulation and repair of damaged DNA. Because TFIIH is involved in more than one cellular process, mutations in some of its subunits can lead to human syndromes : Xeroderma pigmentosum, Trichothiodystrophy and Cockayne syndrome. These genetic disorders are caracterized by complex phenotypes with large ranges of pleiotropic symptoms, including UV-light sensitivity, cancer susceptibilities and developmental abnormalities. In this study, we will describe the function(s) of a ternary subcomplex of TFIIH, named « CAK » (CDK-activating kinase) because of its ability to activate CDKs by phosphorylation, keeping in mind that TFIIH possesses additional enzymatic activities involved in both RNA synthesis and DNA repair.

Taken from the book

The CDK-Activating Kinase (CAK)

Edited by: Philipp Kaldis

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