title: A novel bacteriocin-like substance (BLIS) from a pathogenic strain of Vibrio harveyi.
abstract: Inter-strain and inter-species inhibition mediated by a bacteriocin-like inhibitory substance (BLIS) from a pathogenic Vibrio harveyi strain VIB 571 was demonstrated against four isolates of the same species, and one culture each of a Vibrio sp., Vibrio fischeri, Vibrio gazogenes and Vibrio parahaemolyticus. The crude BLIS, which was obtained by ammonium-sulphate precipitation of the cell-free supernatant of a 72 h broth culture of strain VIB 571, was inactivated by lipase, proteinase K, pepsin, trypsin, pronase E, SDS and incubation at > or =60 degrees C for 10 min. The activity was stable between pH 2-11 for at least 5 h. Anion-exchange chromatography, gel filtration, SDS-PAGE and two-dimensional gel electrophoresis revealed the presence of a single major peak, comprising a protein with a pI of approximately 5.4 and a molecular mass of approximately 32 kDa. The N-terminal amino acid sequence of the protein comprised Asp-Glu-Tyr-Ile-Ser-X-Asn-Lys-X-Ser-Ser-Ala-Asp-Ile (with X representing cysteine or modified amino acid residues). A similarity search based on the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) generated peptide masses and the N-terminal sequence did not yield any significant matches.
authors.affiliation: School of Life Sciences, John Muir Building, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
authors.forename: Sathish
authors.initials: S
authors.lastname: Prasad
authors.affiliation: School of Life Sciences, John Muir Building, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
authors.forename: Peter C
authors.initials: PC
authors.lastname: Morris
authors.affiliation: School of Life Sciences, John Muir Building, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
authors.forename: Rasmus
authors.initials: R
authors.lastname: Hansen
authors.affiliation: School of Life Sciences, John Muir Building, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
authors.forename: Philip G
authors.initials: PG
authors.lastname: Meaden
authors.affiliation: School of Life Sciences, John Muir Building, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK.
authors.forename: Brian
authors.initials: B
authors.lastname: Austin
mesh_terms: D001430:Bacteriocins / Q000032:analysis* / Q000737:chemistry; D004591:Electrophoresis, Polyacrylamide Gel; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014733:Vibrio / Q000737:chemistry* / Q000472:pathogenicity
chemical_list: D001430:Bacteriocins; C506115:bacteriocin-like inhibitory substance, Vibrio harveyi