Science. 1996 Mar 15;271(5255):1597-601.

Rapid degradation of the G1 cyclin Cln2 induced by CDK-dependent phosphorylation.

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Department of Molecular Biology, Scripps Research Institute, La Jolla, CA 92037, USA.

Abstract

Cyclins regulate the major cell cycle transitions in eukaryotes through association with cyclin-dependent protein kinases (CDKs). In yeast, G1 cyclins are essential, rate-limiting activators of cell cycle initiation. G1-specific accumulation of one G1 cyclin, Cln2, results from periodic gene expression coupled with rapid protein turnover. Site-directed mutagenesis of CLN2 revealed that its phosphorylation provides a signal that promotes rapid degradation. Cln2 phosphorylation is dependent on the Cdc28 protein kinase, the CDK that it activates. These findings suggest that Cln2 is rendered self-limiting by virtue of its ability to activate its cognate CDK subunit.

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