Abstract
DNA replication in the budding yeast Saccharomyces cerevisiae initiates from origins of specific DNA sequences during S phase. A screen based on two- and one-hybrid approaches demonstrates that the product of the DBF4 gene interacts with yeast replication origins in vivo. The Dbf4 protein interacts with and positively regulates the activity of the Cdc7 protein kinase, which is required for entry into S phase in the yeast mitotic cell cycle. The analysis described here suggests a model in which one function of Dbf4 may be to recruit the Cdc7 protein kinase to initiation complexes.
MeSH terms
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Base Sequence
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Cell Cycle Proteins*
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DNA Replication*
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DNA, Fungal / biosynthesis
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Enzyme Activation
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Fungal Proteins / genetics
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Fungal Proteins / metabolism*
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Models, Biological
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Molecular Sequence Data
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Point 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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Replicon
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S Phase
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Saccharomyces cerevisiae / cytology
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Saccharomyces cerevisiae / enzymology
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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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Cell Cycle Proteins
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DNA, Fungal
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Dbf4 protein, S cerevisiae
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Fungal Proteins
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Saccharomyces cerevisiae Proteins
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Protein Kinases
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CDC7 protein, S cerevisiae
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Protein Serine-Threonine Kinases