Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/ijms23031293
Keywords
cyclin-dependent kinase; Cdk1; RNA polymerase; transcription; cell cycle
Funding
- Norwegian Health Authority South-East [2017064, 2018012, 2019096]
- Norwegian Cancer Society [182524, 208012]
- Research Council of Norway through its Centers of Excellence [262652, 261936, 294916, 301268]
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Cdk1 is a master regulator of the cell cycle, controlling progression through different phases. It also directly regulates RNA polymerase activity, which is important for protein synthesis and meeting cellular demands. This regulation promotes cell cycle entry.
The cyclin-dependent kinase Cdk1 is best known for its function as master regulator of the cell cycle. It phosphorylates several key proteins to control progression through the different phases of the cell cycle. However, studies conducted several decades ago with mammalian cells revealed that Cdk1 also directly regulates the basal transcription machinery, most notably RNA polymerase II. More recent studies in the budding yeast Saccharomyces cerevisiae have revisited this function of Cdk1 and also revealed that Cdk1 directly controls RNA polymerase III activity. These studies have also provided novel insight into the physiological relevance of this process. For instance, cell cycle-stage-dependent activity of these complexes may be important for meeting the increased demand for various proteins involved in housekeeping, metabolism, and protein synthesis. Recent work also indicates that direct regulation of the RNA polymerase II machinery promotes cell cycle entry. Here, we provide an overview of the regulation of basal transcription by Cdk1, and we hypothesize that the original function of the primordial cell-cycle CDK was to regulate RNAPII and that it later evolved into specialized kinases that govern various aspects of the transcription machinery and the cell cycle.
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