title: The A alpha mating-type locus of Schizophyllum commune: structure and function of gene X.
abstract: Gene X maps immediately right of gene Y at the A alpha mating-type locus in Schizophyllum commune. Alleles X1, X3 and X4 were isolated, subcloned, and sequenced. The structure of the alleles and their relationship to the A alpha locus is described. The deduced X isoforms possess no recognized motifs common to other polypeptides and no significant similarity to any sequences in the protein data-bases. X alleles do not activate A-regulated development when transformed into recipient strains possessing different A alpha mating types or when these transformants are mated with tester strains. An X1-disrupted construction yielded a high frequency (33%) of homologous gene replacements. X-disrupted mutants have wild-type phenotypes and mate normally. Both the functional analyses and sequence data for X1, X3, and X4 suggest that the right boundary of the A alpha mating-type locus falls between A alpha Y and X. We propose that the Z and Y genes constitute the A alpha locus in its entirety.
authors.affiliation: Department of Botany, University of Vermont, Burlington 05405, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Marion
authors.forename: K A
authors.initials: KA
authors.lastname: Bartholomew
authors.forename: J
authors.initials: J
authors.lastname: Wu
authors.forename: H
authors.initials: H
authors.lastname: Yang
authors.forename: C P
authors.initials: CP
authors.lastname: Novotny
authors.forename: R C
authors.initials: RC
authors.lastname: Ullrich
mesh_terms: D000483:Alleles; D001483:Base Sequence; D015139:Blotting, Southern; D018390:Gene Targeting; D005800:Genes, Fungal; D049770:Genes, Mating Type, Fungal; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D014176:Protein Biosynthesis; D012567:Schizophyllum / Q000235:genetics*; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D014170:Transformation, Genetic