Mutations in GSF1 and GSF2 alter glucose signaling in Saccharomyces cerevisiae.
One function of the Saccharomyces cerevisiae Snf1 protein kinase is to relieve glucose repression of SUC, GAL, and other genes in response to glucose depletion. To identify genes that regulate Snf1 kinase activity, we have selected mutants that inappropriately express a SUC2promoter::HIS3 gene fusion when grown in glucose and that require Snf1 function for this phenotype. Mutations representing two new complementation groups (gsf1 and gsf2) were isolated. gsf1 mutations affect two distinct responses to glucose: the Snf1-regulated glucose repression of SUC2 and GAL10 transcription and the Snf1-independent induction by glucose of HXT1 transcription. gsf2 mutations relieve glucose repression of SUC2 and GAL10 transcription and, in combination with snf1 delta, cause an extreme slow growth phenotype. The GSF2 gene was cloned by complementation of the gsf2-1 snf1 delta slow growth phenotype and encodes a previously uncharacterized 46kD protein.
Sherwood
P W
PW
Department of Genetics and Development, Columbia University, New York, New York 10032, USA. pws7@columbia.edu
Carlson
M
M
D000483:Alleles; D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000235:genetics*; D005816:Genetic Complementation Test; D005947:Glucose / Q000378:metabolism*; D008565:Membrane Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D012097:Repressor Proteins / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D015398:Signal Transduction; D014158:Transcription, Genetic
D005656:Fungal Proteins; C120037:Gsf2 protein, S cerevisiae; D008565:Membrane Proteins; D012097:Repressor Proteins; D029701:Saccharomyces cerevisiae Proteins; D005947:Glucose