title: Purification and structure of mutacin B-Ny266: a new lantibiotic produced by Streptococcus mutans.
abstract: Mutacins are bactericidal substances of proteinaceous nature produced by Streptococcus mutans. Lantibiotics are antibacterial substances containing post-translationally modified amino acids such as lanthionine. Mutacin B-Ny266 was purified from the cell pellet of S. mutans strain Ny266 by ethanol extraction at pH 2.0 followed by reversed-phase chromatography (Sep-Pak cartridge) and by HPLC on a C18 column. The mean purification factor was 3240 +/- 81 and the mean yield was 1.0 +/- 0.1%. Molecular mass of mutacin B-Ny266 as determined by mass spectroscopy is 2270.29 +/- 0.21 Da. The amino acid sequence of the purified active fraction was obtained by Edman degradation after treatment with alkaline ethanethiol. Twenty-one amino acids were detected in this analysis. Mutacin B-Ny266 belongs to the type A lantibiotics. The proposed sequence is: F-K-A-W-U-F-A-Abu-P-G-A-A-K-O-G-A-F-N-U-Y-A. The molecule differs from that of epidermin/staphylococcin 1580 and gallidermin at positions 1, 2, 4, 5 and 6.
authors.affiliation: Centre de Recherche en Sciences et Technologie du Lait (STELA), Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, Québec, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Mota-Meira
authors.forename: C
authors.initials: C
authors.lastname: Lacroix
authors.forename: G
authors.initials: G
authors.lastname: LaPointe
authors.forename: M C
authors.initials: MC
authors.lastname: Lavoie
mesh_terms: D000595:Amino Acid Sequence; D001430:Bacteriocins / Q000737:chemistry* / Q000302:isolation & purification; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009943:Organophosphorus Compounds / Q000494:pharmacology; D017386:Sequence Homology, Amino Acid; D013295:Streptococcus mutans / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000494:pharmacology
chemical_list: C043517:2-(4-isothiocyanatophenoxy)-1,3,2-dioxaphosphinene 2-oxide; D001430:Bacteriocins; D009943:Organophosphorus Compounds; D013438:Sulfhydryl Compounds; C107503:mutacin B-Ny266; C007638:ethanethiol