Functional interaction of Isr1, a predicted protein kinase, with the Pkc1 pathway in Saccharomyces cerevisiae.
Staurosporine is a potent inhibitor of protein kinase C. To identify the genes that functionally interact with the Pkc1 pathway of the yeast Saccharomyces cerevisiae, we screened for the genes that cause induced staurosporine sensitivity when overexpressed from a galactose-inducible promoter. The novel gene ISR1 encodes a predicted protein kinase with the highest sequence similarity to mammalian Raf in the kinase domain. Drug sensitivity induced by ISR1 overexpression is specific to staurosporine. Although ISR1 disruption causes no obvious phenotype, it does exacerbate the phenotypes of a temperature-sensitive allele (stt1-1) of PKC1, but not of the mpk1 and bck1 mutants of the Mpk1 MAP kinase pathway. These results suggest that Isr1 functions in an event important for growth in a manner redundant with a Mpk1-independent branch of the Pkc1 signalling pathways.
Department of Molecular Biotechnology, Faculty of Engineering, Hiroshima University, Japan.
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Miyahara
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Hirata
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Miyakawa
D003470:Culture Media; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics*; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D005800:Genes, Fungal; D020928:Mitogen-Activated Protein Kinases; D010641:Phenotype; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D015398:Signal Transduction; D019311:Staurosporine / Q000494:pharmacology
D003470:Culture Media; D004791:Enzyme Inhibitors; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; C097993:Pkc1 protein, Trichoderma reesei; D011493:Protein Kinase C; D020928:Mitogen-Activated Protein Kinases; C072724:SLT2 protein, S cerevisiae; D019311:Staurosporine