The wis1 protein kinase is a dosage-dependent regulator of mitosis in Schizosaccharomyces pombe.
The wis1+ gene encodes a newly identified mitotic control element in Schizosaccharomyces pombe. It was isolated by virtue of its interaction with the mitotic control genes cdc25, wee1 and win1. The wis1+ gene potentially encodes a 66 kDa protein with homology to the serine/threonine family of protein kinases. wis1+ plays an important role in the regulation of entry into mitosis, as it shares with cdc25+ and nim1+/cdr1+ the property of inducing mitosis in a dosage-dependent manner. Increased levels of wis1+ expression cause mitotic initiation to occur at a reduced cell size. Loss of wis1+ function does not prevent vegetative growth and division, though wis1- cells show an elongated morphology, indicating that their entry into mitosis and cell division is delayed relative to wild type cells. wis1- cells undergo a rapid reduction of viability upon entry into stationary phase, suggesting a role for wis1+ in the integration of nutritional sensing with the control over entry into mitosis.
Warbrick
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Institute of Cell and Molecular Biology, University of Edinburgh, UK.
Fantes
P A
PA
D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D020929:Mitogen-Activated Protein Kinase Kinases; D008938:Mitosis / Q000235:genetics; D008969:Molecular Sequence Data; D011494:Protein Kinases / Q000235:genetics* / Q000378:metabolism; D012331:RNA, Fungal / Q000235:genetics; D015183:Restriction Mapping; D012568:Schizosaccharomyces / Q000166:cytology* / Q000201:enzymology / Q000235:genetics; D029702:Schizosaccharomyces pombe Proteins; D012689:Sequence Homology, Nucleic Acid; D013489:Suppression, Genetic
D004271:DNA, Fungal; D005656:Fungal Proteins; D012331:RNA, Fungal; D029702:Schizosaccharomyces pombe Proteins; D011494:Protein Kinases; D020929:Mitogen-Activated Protein Kinase Kinases; C072068:wis1 protein, S pombe