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mcm5/cdc46-bob1 bypasses the requirement for the S phase activator Cdc7p

Hardy, C.F.J., Dryga, O., Seematter, S., Pahl, P.M.B., Sclafini, R.A.
Proceedings of the National Academy of Sciences of the United States of America 1997 v.94 no.7 pp. 3151-3155
Saccharomyces cerevisiae, DNA replication, recessive genes, mutants, DNA-binding proteins, chromosome mapping, mutation
Cdc7p is a protein kinase that is G1/S transition and initiation of DNA replication in Saccharomyces cerevisiae. The mechanisms whereby Cdc7p and its substrates exerts their effects are unknown. We report bite the characterization in S. cerevisiae of a recessive mutation in a member of the MCM family MCM5/CDC46, which bypasses the requirement for Cdc7p and its interacting factor Dbf4p. Because the MCM family of evolutionarily conserved proteins have been implicated in restricting DNA replication to once per cell cycle, our studies suggest that Cdc7p is required late in G1 because in its absence the Mcm5p/Cdc46p blocks the initiation of DNA replication. Moreover, Mcm5p/Cdc46p may have both positive and negative effects on the ability of cell to initiate replication.