Yeast peptide pheromones, a-factor and alpha-factor, activate a common response mechanism in their target cells.
We show that in yeast the cell type specificity of pheromone response is determined solely by the species of receptor that a cell synthesizes. The two receptor-pheromone interactions are functionally interchangeable and involve the creation of a common intracellular signal. In particular, we find that provision of a-factor receptor or alpha-factor receptor in mat alpha 1 mutants, which normally do not express either receptor or any other a- or alpha-specific products, allows response to the appropriate pheromone. Moreover, provision of a-factor receptor in a cells lacking alpha-factor receptor restores mating competence to those cells. Finally, an aspect of pheromone response that is normally unique to a-factor action on alpha cells--increased transcription from the alpha-specific STE3 gene--can also be observed following alpha-factor treatment of pseudo-a cells (mat alpha 2 ste3 ste13), special mutants that respond to alpha-factor and also have an active STE3 promoter.
D005800:Genes, Fungal; D007399:Interphase; D000072235:Mating Factor; D010455:Peptides / Q000378:metabolism* / Q000494:pharmacology; D010675:Pheromones / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000235:genetics / Q000378:metabolism*; D051964:Receptors, Mating Factor; D018000:Receptors, Peptide; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D014157:Transcription Factors; D014158:Transcription, Genetic
D010455:Peptides; D010675:Pheromones; D011956:Receptors, Cell Surface; D051964:Receptors, Mating Factor; D018000:Receptors, Peptide; D014157:Transcription Factors; D000072235:Mating Factor