Abstract
Cyclin-dependent kinase (Cdk) mutations that prevent entry into the mitotic cell cycle of budding yeast fail to block meiotic DNA replication, suggesting there may be fundamental differences between these pathways. However, S phase in meiosis was found to depend on the same B-type cyclins (Clb5 and Clb6) as it does in mitosis. Meiosis differs instead in the mechanism that controls removal of the Cdk inhibitor Sic1. Destruction of Sic1 and activation of a Clb5-dependent kinase in meiotic cells required the action of the meiosis-specific protein kinase Ime2, thereby coupling early meiotic gene expression to control of DNA replication for meiosis.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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CDC28 Protein Kinase, S cerevisiae / metabolism
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Cell Cycle Proteins*
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Cyclin B*
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Cyclin-Dependent Kinase Inhibitor Proteins
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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 Replication
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Enzyme Inhibitors / metabolism
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Fungal Proteins / genetics
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Fungal Proteins / metabolism*
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Genes, Fungal
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Intracellular Signaling Peptides and Proteins
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Meiosis*
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Mutation
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Protein Kinases / genetics
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Protein Kinases / metabolism*
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Protein Serine-Threonine Kinases
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S Phase*
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Saccharomyces cerevisiae / cytology*
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Saccharomyces cerevisiae / genetics
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Saccharomyces cerevisiae / metabolism
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Saccharomyces cerevisiae Proteins*
Substances
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CLB5 protein, S cerevisiae
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CLB6 protein, S cerevisiae
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Cell Cycle Proteins
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Cyclin B
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Cyclin-Dependent Kinase Inhibitor Proteins
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Cyclins
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Enzyme Inhibitors
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Fungal Proteins
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Intracellular Signaling Peptides and Proteins
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SIC1 protein, S cerevisiae
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Saccharomyces cerevisiae Proteins
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Protein Kinases
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IME2 protein, S cerevisiae
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Protein Serine-Threonine Kinases
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CDC28 Protein Kinase, S cerevisiae
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Cyclin-Dependent Kinases