title: Isolation and characterization of Saccharomyces cerevisiae mutants supersensitive to G1 arrest by the mating hormone a-factor.
abstract: Nine independent mutants which are supersensitive (ssl-) to G1 arrest by the mating hormone a-factor were isolated by screening mutagenized Saccharomyces cerevisiae MAT alpha cells on solid medium for increased growth inhibition with a-factor. These mutants carried lesions in two complementation groups, ssl1 and ssl2. Mutations at the ssl1 locus were mating type specific: MAT alpha ssl1- cells were supersensitive to a-factor but MATa ssl1- were not supersensitive to alpha-factor. In contrast, mutations at the ssl2 locus conferred supersensitivity to the mating hormone of the opposite mating type on both MAT alpha and MATa cells. The alpha-cell specific capacity to inactivate externally added a-factor was shown to be lacking in MAT alpha ssl1- mutants whereas MAT alpha ssl2- cells were able to inactivate a-factor. Complementation analysis showed that ssl2 and sst2, a mutation originally isolated as conferring supersensitivity to alpha-factor to MATa cells, are lesions in the same gene. The ssl1 gene was mapped 30.5 centiMorgans distal to ilv5 on chromosome XII.
authors.affiliation: Institut für Physiologische Chemie, Ruhr-Universität Bochum, Federal Republic of Germany.
authors.forename: M
authors.initials: M
authors.lastname: Steden
authors.forename: R
authors.initials: R
authors.lastname: Betz
authors.forename: W
authors.initials: W
authors.lastname: Duntze
mesh_terms: D000483:Alleles; D002874:Chromosome Mapping; D005800:Genes, Fungal; D049770:Genes, Mating Type, Fungal; D005816:Genetic Complementation Test; D007399:Interphase; D000072235:Mating Factor; D009154:Mutation; D010455:Peptides / Q000235:genetics*; D010641:Phenotype; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000254:growth & development
chemical_list: D010455:Peptides; D000072235:Mating Factor