mcm5/cdc46-bob1 bypasses the requirement for the S phase activator Cdc7p.
Cdc7p is a protein kinase that is required for 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 here 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.
Hardy
C F
CF
Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110, USA. chardy@cellbio.wustl.edu
Dryga
O
O
Seematter
S
S
Pahl
P M
PM
Sclafani
R A
RA
D000595:Amino Acid Sequence; D018797:Cell Cycle Proteins / Q000235:genetics*; D005434:Flow Cytometry; D008969:Molecular Sequence Data; D009154:Mutation; D011494:Protein Kinases / Q000378:metabolism*; D017346:Protein Serine-Threonine Kinases; D016196:S Phase; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D015534:Trans-Activators / Q000235:genetics*
D018797:Cell Cycle Proteins; C069200:MCM5 protein, S cerevisiae; C489423:MCM5 protein, human; D029701:Saccharomyces cerevisiae Proteins; D015534:Trans-Activators; D011494:Protein Kinases; C489404:CDC7 protein, S cerevisiae; D017346:Protein Serine-Threonine Kinases