Distinct activation pathways confer cyclin-binding specificity on Cdk1 and Cdk2 in human cells Journal Article
| Authors: | Merrick, K. A.; Larochelle, S.; Zhang, C.; Allen, J. J.; Shokat, K. M.; Fisher, R. P. |
| Article Title: | Distinct activation pathways confer cyclin-binding specificity on Cdk1 and Cdk2 in human cells |
| Abstract: | In metazoans, different cyclin-dependent kinases (CDKs) bind preferred cyclin partners to coordinate cell division. Here, we investigate these preferences in human cells and show that cyclin A assembles with Cdk1 only after complex formation with Cdk2 reaches a plateau during late S and G2 phases. To understand the basis for Cdk2's competitive advantage, despite Cdk1's greater abundance, we dissect their activation pathways by chemical genetics. Cdk1 and Cdk2 are activated by kinetically distinct mechanisms, even though they share the same CDK-activating kinase (CAK), Cdk7. We recapitulate cyclin A's selectivity for Cdk2 in extracts and override it with a yeast CAK that phosphorylates monomeric Cdk1, redirecting Cdk1 into a pathway normally restricted to Cdk2. Conversely, upon Cdk7 inhibition in vivo, cyclin B, which normally binds Cdk1 nearly exclusively, is diverted to Cdk2. Therefore, differential ordering of common activation steps promotes CDK-cyclin specificity, with Cdk7 acting catalytically to enforce fidelity. © 2008 Elsevier Inc. All rights reserved. |
| Keywords: | human cell; nonhuman; animals; cell cycle; cell cycle s phase; complex formation; enzyme inhibition; models, biological; protein assembly; hct116 cells; enzyme activation; phosphorylation; molecular mechanics; enzyme phosphorylation; saccharomyces cerevisiae; substrate specificity; cellcycle; cell cycle g2 phase; catalysis; enzyme specificity; cyclin-dependent kinases; cyclins; enzyme binding; phosphates; phosphothreonine; cell extracts; cyclin dependent kinase 1; metazoa; cyclin dependent kinase 2; cyclin-dependent kinase 2; enzyme stability; cdc2 protein kinase |
| Journal Title: | Molecular Cell |
| Volume: | 32 |
| Issue: | 5 |
| ISSN: | 1097-2765 |
| Publisher: | Cell Press |
| Date Published: | 2008-12-05 |
| Start Page: | 662 |
| End Page: | 672 |
| Language: | English |
| DOI: | 10.1016/j.molcel.2008.10.022 |
| PUBMED: | 19061641 |
| PROVIDER: | scopus |
| PMCID: | PMC2643088 |
| DOI/URL: | |
| Notes: | --- - "Cited By (since 1996): 11" - "Export Date: 17 November 2011" - "CODEN: MOCEF" - "Source: Scopus" |
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