title: Sumoylation of transcription factor Tec1 regulates signaling of mitogen-activated protein kinase pathways in yeast.
abstract: Tec1 is a transcription factor in the yeast mitogen-activated protein kinase (MAPK) pathway that controls invasive growth. Previously we reported that a fraction of Tec1 protein is sumoylated on residue lysine 54 in normally growing cells. Here we describe regulation and functional consequences of Tec1 sumoylation. We found that activation of Kss1, the MAPK that directly activates Tec1, results in a decrease in Tec1 sumoylation and a concurrent increase of Tec1 transcriptional activity. Consistent with a role of sumoylation in inhibiting Tec1 activity, specifically increasing sumoylation of Tec1 by fusing it to the sumoylating enzyme Ubc9 leads to a dramatic decrease of Tec1 transcriptional activity. Invasive growth is also compromised in Tec1-Ubc9. In contrast, fusing sumoylation-site mutant Tec1, i.e., Tec1(K54R), to Ubc9 did not significantly alter transcriptional activation and had a less effect on invasive growth. Taken together, these findings provide evidence for regulated sumoylation as a mechanism to modulate the activity of Tec1 and validate Ubc9 fusion-directed sumoylation as a useful approach for studying protein sumoylation.
authors.affiliation: Department of Biology, Saint Louis University, St. Louis, Missouri, United States of America. ywang8@slu.edu
authors.forename: Yuqi
authors.initials: Y
authors.lastname: Wang
authors.forename: Ameair
authors.initials: A
authors.lastname: Abu Irqeba
authors.forename: Mihretu
authors.initials: M
authors.lastname: Ayalew
authors.forename: Kristina
authors.initials: K
authors.lastname: Suntay
mesh_terms: D001681:Biological Assay; D004268:DNA-Binding Proteins / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D020935:MAP Kinase Signaling System; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D008954:Models, Biological; D009994:Osmolar Concentration; D010675:Pheromones / Q000378:metabolism; D010766:Phosphorylation; D011485:Protein Binding; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D025842:SUMO-1 Protein / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D044763:Ubiquitin-Conjugating Enzymes / Q000378:metabolism; D000098843:Ubiquitin-Conjugating Enzyme UBC9
chemical_list: D004268:DNA-Binding Proteins; D010675:Pheromones; D011993:Recombinant Fusion Proteins; D025842:SUMO-1 Protein; D029701:Saccharomyces cerevisiae Proteins; C069926:TEC1 protein, S cerevisiae; D014157:Transcription Factors; D044763:Ubiquitin-Conjugating Enzymes; C541984:KSS1 protein, S cerevisiae; D020928:Mitogen-Activated Protein Kinases; D000098843:Ubiquitin-Conjugating Enzyme UBC9