Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Characterization and Phylogenetic Analysis of Chitin Synthase Genes from the Genera Sporobolomyces and Bensingtonia subrorea

  • Nam, Jin-Sik (Department of Food & Nutrition, Faculty of Food Science, Suwon Women's College)
  • Published : 2005.12.01
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Abstract

We cloned seven genes encoding chitin synthases (CHSs) by PCR amplification from genomic DNAs of four strains of the genus Sporobolomyces and of Bensingtonia subrosea using degenerated primers based on conserved regions of the CHS genes. Though amino acid sequences of these genes were shown similar as 176 to 189 amino acids except SgCHS2, DNA sequences were different in size, which was due to various introns present in seven fragments. Alignment and phylogenetic analysis of their deduced amino acid sequences together with the reported CHS genes of basidiomycetes separated the sequences into classes I, II and III. This analysis also permitted the classification of isolated CHSs; SgCHS1 belongs to class I, BsCHS1, SaCHS1, SgCHS2, SpgCHS1, and SsCHS1 belong to class II, and BsCHS2 belongs to class III. The deduced amino acid sequences involving in class II that were discovered from five strains were also compared with those of other basidiomycetes by CLUSTAL X program. The bootstrap analysis and phylogenetic tree by neighbor-joining method revealed the taxonomic and evolutionary position for four strains of the genus Sporobolomyces and for Bensingtonia subrosea which agreed with the previous classification. The results clearly showed that CHS fragments could be used as a valuable key for the molecular taxonomic and phylogenetic studies of basidiomycetes.

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