Abstract
Cyclin-dependent kinase (cdk) complexes are essential activators of cell cycle progression in all eukaryotes. In contrast to mammalian cells, in which multiple cdk's contribute to cell cycle regulation, the yeast cell cycle is largely controlled by the activity of a single cdk, CDC28. Analysis of the putative G1 cyclin PCL2 (ORFD) identified a second cyclin-cdk complex that contributes to cell cycle progression in yeast. PCL2 interacted with the cdk PHO85 in vivo and in vitro and formed a kinase complex that had G1-periodic activity. Under genetic conditions in which the Start transition was compromised, PHO85 and its associated cyclin subunits were essential for cell cycle commitment. Because PHO85 and another cyclin-like molecule, PHO80, also take part in inorganic phosphate metabolism, this cdk enzyme may integrate responses to nutritional conditions with the cell cycle.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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CDC28 Protein Kinase, S cerevisiae / metabolism
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Cyclin-Dependent Kinases / metabolism*
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Cyclins / genetics
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Cyclins / metabolism*
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DNA-Binding Proteins*
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Fungal Proteins / genetics
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Fungal Proteins / metabolism*
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G1 Phase*
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Models, Biological
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Phosphorylation
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Recombinant Fusion Proteins / metabolism
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Saccharomyces cerevisiae / cytology*
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Saccharomyces cerevisiae / growth & development
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Saccharomyces cerevisiae / metabolism
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Saccharomyces cerevisiae Proteins*
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Temperature
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Transcription Factors / metabolism
Substances
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CLN1 protein, S cerevisiae
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CLN2 protein, S cerevisiae
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Cyclins
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DNA-Binding Proteins
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Fungal Proteins
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PCL2 protein, S cerevisiae
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PHO4 protein, S cerevisiae
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Recombinant Fusion Proteins
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Saccharomyces cerevisiae Proteins
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Transcription Factors
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PCL1 protein, S cerevisiae
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CDC28 Protein Kinase, S cerevisiae
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Cyclin-Dependent Kinases
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PHO85 protein, S cerevisiae