title: Mcs4, a two-component system response regulator homologue, regulates the Schizosaccharomyces pombe cell cycle control.
abstract: The Schizosaccharomyces pombe cdc2-3w wee1-50 double mutant displays a temperature-sensitive lethal phenotype termed mitotic catastrophe. Six mitotic catastrophe suppressor (mcs1-6) genes were identified in a genetic screen designed to identify regulators of cdc2. Mutations in mcs1-6 suppress the cdc2-3w wee1-50 temperature-sensitive growth defect. Here, the cloning of mcs4 is described. The mcs4 gene product displays significant sequence homology to members of the two-component system response regulator protein family. Strains carrying the mcs4 and cdc25 mutations display a synthetic osmotic lethal phenotype along with an inability to grow on minimal synthetic medium. These phenotypes are suppressed by a mutation in wee1. In addition, the wis1 gene, encoding a stress-activated mitogen-activated protein kinase kinase, was identified as a dosage suppressor in this screen. These findings link the two-component signal transduction system to stress response and cell cycle control in S. pombe.
authors.affiliation: Mitotix, Cambridge, Massachusetts 02139, USA. cottarel@mitotix.com
authors.forename: G
authors.initials: G
authors.lastname: Cottarel
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002455:Cell Division; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D020929:Mitogen-Activated Protein Kinase Kinases; D008969:Molecular Sequence Data; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D012568:Schizosaccharomyces / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D029702:Schizosaccharomyces pombe Proteins; D017386:Sequence Homology, Amino Acid; D020666:ras-GRF1
chemical_list: D018797:Cell Cycle Proteins; D005656:Fungal Proteins; C105788:Mcs4 protein, S pombe; D029702:Schizosaccharomyces pombe Proteins; C080926:cdc22 protein, S pombe; D020666:ras-GRF1; D017346:Protein Serine-Threonine Kinases; D020929:Mitogen-Activated Protein Kinase Kinases; C072068:wis1 protein, S pombe