title: Dse1 may control cross talk between the pheromone and filamentation pathways in yeast.
abstract: The filamentous/invasive growth pathway is activated by nutrient limitation in the haploid form of the yeast Saccharomyces cerevisiae, whereas exposure to mating-pheromone causes cells to differentiate into gametes. Although these two pathways respond to very different stimuli and generate very different responses, they utilize many of the same signaling components. This implies the need for robust mechanisms to maintain signal fidelity. Dse1 was identified in an allele-specific suppressor screen for proteins that interact with the pheromone-responsive Gbetagamma, and found to bind both to a Gbetagamma-affinity column, and to the shared MEKK, Ste11. Although overexpression of Dse1 stimulated invasive growth and transcription of both filamentation and mating-specific transcriptional reporters, deletion of DSE1 had no effect on these outputs. In contrast, pheromone hyper-induced transcription of the filamentation reporter in cells lacking Dse1 and in cells expressing a mutant form of Gbeta that exhibits diminished interaction with Dse1. Thus, the interaction of Dse1 with both Gbeta and Ste11 may be designed to control cross talk between the pheromone and filamentation pathways.
authors.affiliation: Laboratory for Molecular Biology (M/C 567), Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL 60607, USA.
authors.forename: Edward
authors.initials: E
authors.lastname: Draper
authors.forename: Oleksii
authors.initials: O
authors.lastname: Dubrovskyi
authors.forename: Eli E
authors.initials: EE
authors.lastname: Bar
authors.forename: David E
authors.initials: DE
authors.lastname: Stone
mesh_terms: D001665:Binding Sites; D002352:Carrier Proteins / Q000235:genetics / Q000502:physiology*; D002453:Cell Cycle / Q000187:drug effects; D002846:Chromatography, Affinity; D044387:GTP-Binding Protein beta Subunits / Q000235:genetics / Q000502:physiology*; D055785:Gene Knockdown Techniques; D017930:Genes, Reporter; D006238:Haploidy; D020930:MAP Kinase Kinase Kinases / Q000235:genetics / Q000502:physiology*; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D025941:Protein Interaction Mapping; D011498:Protein Precursors / Q000494:pharmacology*; D011993:Recombinant Fusion Proteins / Q000502:physiology; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000235:genetics / Q000254:growth & development / Q000502:physiology*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000494:pharmacology / Q000502:physiology*; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D020798:Two-Hybrid System Techniques
chemical_list: D002352:Carrier Proteins; C548301:DSE1 protein, S cerevisiae; D044387:GTP-Binding Protein beta Subunits; C048632:MF(ALPHA)1 protein, S cerevisiae; D011498:Protein Precursors; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; C067576:Ste4 protein, S cerevisiae; D020930:MAP Kinase Kinase Kinases; C067018:Ste11 protein, S cerevisiae