title: Antibacterial activity of a disaccharide isolated from Streptomyces sp. strain JJ45 against Xanthomonas sp.
abstract: Of the 316 actinomycetes strains isolated from various habitats, Streptomyces sp. strain JJ45 showed the strongest antibiotic activity against the plant pathogenic bacteria Xanthomonas campestris pv. campestris and was thus chosen for further study. The 16S rRNA gene sequence (1500 bp) and rpoB gene partial sequence (306 bp) of Streptomyces strains JJ45A and JJ45B were determined. The respective strain JJ45B sequences exhibited 96.8% identity with the Streptococcus gelaticus 16S rRNA gene sequence and 98.4% identity with the Streptococcus vinaceus ATCC 27478 rpoB partial sequence. The fermentation broth of the JJ45B strain was extracted to find an inhibitor of bacterial growth. The distilled water extract showed the highest activity against pathogenic bacteria. The active molecule was isolated by column chromatography on polyacrylamide or silica gel, thin-layer chromatography, and HPLC. It showed growth inhibition activity only toward phytopathogenic Xanthomonas sp. The structure of the compound was identified as alpha-l-sorbofuranose (3-->2)-beta-D-altrofuranose based on the interpretation of the nuclear magnetic resonance spectra.
authors.affiliation: Department of Biochemistry, Cheju National University, Jeju, Korea.
authors.forename: Yoon-Suk
authors.initials: YS
authors.lastname: Kang
authors.forename: Yukyung
authors.initials: Y
authors.lastname: Lee
authors.forename: Somi K
authors.initials: SK
authors.lastname: Cho
authors.forename: Keun-Hwa
authors.initials: KH
authors.lastname: Lee
authors.forename: Bum-Joon
authors.initials: BJ
authors.lastname: Kim
authors.forename: Minkyun
authors.initials: M
authors.lastname: Kim
authors.forename: Yoongho
authors.initials: Y
authors.lastname: Lim
authors.forename: Moonjae
authors.initials: M
authors.lastname: Cho
mesh_terms: D000900:Anti-Bacterial Agents / Q000302:isolation & purification / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D004187:Disaccharides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013302:Streptomyces / Q000737:chemistry* / Q000145:classification / Q000235:genetics; D016959:Xanthomonas campestris / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D004187:Disaccharides; D012336:RNA, Ribosomal, 16S; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit