title: Insertional mutagenesis and characterization of a polyketide synthase gene (PKS1) required for melanin biosynthesis in Bipolaris oryzae.
abstract: A polyketide synthase gene named PKS1, involved in the melanin biosynthesis pathway of the phytopathogenic fungus Bipolaris oryzae, was isolated using restriction enzyme-mediated integration. Sequence analysis showed that the PKS1 encodes a putative protein that has 2155 amino acids and significant similarity to other fungal polyketide synthases. Targeted disruption of the PKS1 gene showed that it is necessary for melanin biosynthesis in B. oryzae. Northern blot analysis showed that PKS1 transcripts were specifically enhanced by near-ultraviolet radiation (300-400 nm) and that its temporal transcriptional patterns were similar to those of THR1 and SCD1 genes involved in the melanin biosynthesis pathway of B. oryzae.
authors.affiliation: Faculty of Life and Environmental Science, Shimane University, Matsue, Shimane 690-8504, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Moriwaki
authors.forename: Junichi
authors.initials: J
authors.lastname: Kihara
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Toshiko
authors.initials: T
authors.lastname: Tokunaga
authors.forename: Sakae
authors.initials: S
authors.lastname: Arase
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Honda
mesh_terms: D000595:Amino Acid Sequence; D001203:Ascomycota / Q000201:enzymology* / Q000235:genetics; D017124:Conserved Sequence; D004271:DNA, Fungal / Q000737:chemistry / Q000302:isolation & purification; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D008543:Melanins / Q000096:biosynthesis*; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D016366:Open Reading Frames; D048630:Polyketide Synthases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D012331:RNA, Fungal / Q000096:biosynthesis; D012333:RNA, Messenger / Q000096:biosynthesis; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic; D014466:Ultraviolet Rays
chemical_list: D004271:DNA, Fungal; D005656:Fungal Proteins; D008543:Melanins; D012331:RNA, Fungal; D012333:RNA, Messenger; D048630:Polyketide Synthases