title: Evidence for interaction of Schizophyllum commune Y mating-type proteins in vivo.
abstract: The Aalpha mating-type locus of Schizophyllum commune regulates sexual development and contains the code for two proteins, Y and Z, which are thought to form a complex and function as a transcription factor. Import of these proteins into the nucleus may be an essential step in Aalpha-regulated sexual development. The Y proteins contain a bipartite basic sequence, which is an excellent candidate for a nuclear localization sequence (NLS), while Z proteins contain no such sequence. Here we describe experiments in which deletions were made in the putative NLS sequence of Y4. We show that this putative NLS is essential to the function of the Y protein and capable of mislocalizing green fluorescent protein (GFP) to the nucleus in Saccharomyces cerevisiae. Further, we describe genetic experiments that demonstrate the first Y-Y protein interactions in vivo. These results are consistent with our previously postulated hypothesis that the Y-Z complex is likely to be of a higher order than dimer.
authors.affiliation: Cell and Molecular Biology Program, University of Vermont, Burlington, Vermont 05405, USA.
authors.forename: C Ian
authors.initials: CI
authors.lastname: Robertson
authors.forename: Alexander
authors.initials: A
authors.lastname: McMahon Kende
authors.forename: Kurt
authors.initials: K
authors.lastname: Toenjes
authors.forename: Charles P
authors.initials: CP
authors.lastname: Novotny
authors.forename: Robert C
authors.initials: RC
authors.lastname: Ullrich
mesh_terms: D000595:Amino Acid Sequence; D005656:Fungal Proteins / Q000502:physiology*; D005800:Genes, Fungal; D049770:Genes, Mating Type, Fungal; D049452:Green Fluorescent Proteins; D018398:Homeodomain Proteins / Q000235:genetics / Q000502:physiology*; D008164:Luminescent Proteins / Q000378:metabolism; D008969:Molecular Sequence Data; D019913:Nuclear Localization Signals / Q000235:genetics / Q000378:metabolism; D012567:Schizophyllum / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D017384:Sequence Deletion; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*
chemical_list: D005656:Fungal Proteins; D018398:Homeodomain Proteins; D008164:Luminescent Proteins; D019913:Nuclear Localization Signals; D014157:Transcription Factors; D049452:Green Fluorescent Proteins; C075905:homeodomain protein, Schizophyllum commune