Non-proteolytic inactivation of geminin requires CDK-dependent ubiquitination

Li, Anatoliy and Blow, J. Julian (2004) Non-proteolytic inactivation of geminin requires CDK-dependent ubiquitination. Nature Cell Biology, 6 (3). pp. 260-267. ISSN 1465-7392

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In late mitosis and G1, a complex of the essential initiation proteins Mcm2–7 are assembled onto replication origins to 'license' them for initiation. At other times licensing is inhibited by cyclin-dependent kinases (CDKs) and geminin, thus ensuring that origins fire only once per cell cycle. Here we show that, paradoxically, CDKs are also required to inactivate geminin and activate the licensing system. On exit from metaphase in Xenopus laevis egg extracts, CDK-dependent activation of the anaphase-promoting complex (APC/C) results in the transient polyubiquitination of geminin. This ubiquitination triggers geminin inactivation without requiring ubiquitin-dependent proteolysis, and is essential for replication origins to become licensed. This reveals an unexpected role for CDKs and ubiquitination in activating chromosomal DNAreplication.

Item Type: Article
Additional Information: dc.publisher: Nature Publishing Group dc.description.sponsorship: Cancer Research UK SP2385/0101 C303/A3135
Faculty \ School:
Depositing User: LivePure Connector
Date Deposited: 10 Jun 2024 16:30
Last Modified: 10 Jun 2024 16:30
DOI: 10.1038/ncb1100

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