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  • Original Paper
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Human cyclin C protein is stabilized by its associated kinase cdk8, independently of its catalytic activity

Abstract

Cyclin C belongs to the cyclin family of proteins that control cell cycle transitions through activation of specific catalytic subunits, the cyclin-dependent kinases (CDKs). However, there is as yet no evidence for any role of cyclin C and its partner, cdk8, in cell cycle regulation. Rather, the cyclin C-cdk8 complex was found associated with the RNA polymerase II transcription machinery. The periodic degradation of bona fide cyclins is crucial for cell-cycle progression and depends on the catalytic activity of the associated CDK. Here we show that endogenous cyclin C protein is quite stable with a half-life of 4 h. In contrast, exogenously expressed cyclin C is very unstable (half-life 15 min) and degraded by the ubiquitin-proteasome pathway. Co-expression with its associated cdk, however, strongly stabilizes cyclin C and results in a protein half-life near that of endogenous cyclin C. In stark contrast to data reported for other members of the cyclin family, both catalytically active and inactive cdk8 induce cyclin C stabilization. Moreover, this stabilization is accompanied in both cases by phosphorylation of the cyclin, which is not detectable when unstable. Our results indicate that cyclin C has apparently diverged from other cyclins in the regulation of its stability by its CDK partner.

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Acknowledgements

We thank H Bujard, R Dynan, P Hinds, C Sardet and M Trier for providing plasmids and P Dariavach for the anti-HA 12CA5 antibody. We are grateful to V Dulic for the gift of anti-cyclin D1 antibody, help with making anti-cyclin C antibody and discussions. We also thank P Bello and D Fesquet for a critical review of the manuscript. This work was supported by the Centre National de la Recherche Scientifique, the Association pour la Recherche sur le Cancer and the Ligue Nationale Contre Le Cancer. C.B. was supported by a grant from the French Ministère de la Recherche and the Association pour la Recherche sur le Cancer.

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Barette, C., Jariel-Encontre, I., Piechaczyk, M. et al. Human cyclin C protein is stabilized by its associated kinase cdk8, independently of its catalytic activity. Oncogene 20, 551–562 (2001). https://doi.org/10.1038/sj.onc.1204129

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