title: Special type of pheromone-induced invasive growth in Saccharomyces cerevisiae.
abstract: The ability to invade a solid substrate is an important phenomenon due to its connection with pathogenic activity of fungi. We report here on invasion displayed by MATalpha cells of Saccharomyces cerevisiae lacking Isw2p, a subunit of the ISW2 chromatin remodelling complex. We found that on minimal medium, where the isw2Delta MATalpha mutant is not invasive, additional absence of another ISW2 complex subunit, Dls1p or Dpb4p, promoted invasion. Our microarray data showed that derepression of MAT a-specific genes caused by absence of Isw2p is very low. Their expression is increased only by the autocrine activation of the mating pathway. Invasion of isw2Delta MATalpha cells thus resembles the pheromone-induced invasion, including dependence on Fig2p. We show here that another pheromone-induced protein, mating agglutinin Aga1p, can play a role in the agar adhesion necessary for invasion. In contrast with MAT a-cells invading agar under low alpha-pheromone concentration, the invasive growth of isw2Delta cells specifically requires Fus3 kinase. Its function in the invasion of isw2Delta MATalpha cells cannot be completely substituted by Kss1 kinase, which plays a basic role in invasive growth signalling. We suggest that partial dependence of the isw2Delta MATalpha invasion on Fus3p and Aga1p corresponds to a weaker pheromone response of this mutant.
authors.affiliation: Institute of Microbiology of AS CR, v.v.i, Vídenská 1083, 142 20 Prague 4, Czech Republic.
authors.forename: Ivana
authors.initials: I
authors.lastname: Frýdlová
authors.forename: Marek
authors.initials: M
authors.lastname: Basler
authors.forename: Pavla
authors.initials: P
authors.lastname: Vasicová
authors.forename: Ivana
authors.initials: I
authors.lastname: Malcová
authors.forename: Jirí
authors.initials: J
authors.lastname: Hasek
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism; D015815:Cell Adhesion Molecules / Q000235:genetics / Q000378:metabolism; D017353:Gene Deletion; D005800:Genes, Fungal; D020935:MAP Kinase Signaling System; D020928:Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism; D008954:Models, Biological; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D011498:Protein Precursors / Q000235:genetics / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation
chemical_list: C543384:AGA1 protein, S cerevisiae; D015815:Cell Adhesion Molecules; C484870:DLS1 protein, S cerevisiae; C470565:Fig2 protein, S cerevisiae; C086468:ISWI protein; C048632:MF(ALPHA)1 protein, S cerevisiae; D009687:Nuclear Proteins; D011498:Protein Precursors; C489241:STE12 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; C069939:a-agglutinin protein, S cerevisiae; C075580:FUS3 protein, S cerevisiae; C541984:KSS1 protein, S cerevisiae; D020928:Mitogen-Activated Protein Kinases; D000251:Adenosine Triphosphatases