title: BF3-catalysed methanolysis combined with fast atom bombardment tandem mass spectrometry as a new tool for the preparation and analysis of linear secocyclosporins.
abstract: BF3-catalysed methanolysis is presented for cyclic peptide cleavage using cyclosporins as model compounds. The reaction conditions for BF3-catalysed methanolysis of cyclosporins were optimized to favour the formation of linear undecapeptides. The resulting secocyclosporins were analysed by fast atom bombardment tandem mass spectrometry. Only one dominant and two side mechanisms of the ring opening are operating so that the complete sequence determination of all prepared oligopeptides was achieved.
authors.affiliation: Institute of Microbiology, Academy of Sciences of the Czech Republic, Prague 4, Czech Republic.
authors.forename: V
authors.initials: V
authors.lastname: Havlícek
authors.forename: A
authors.initials: A
authors.lastname: Jegorov
authors.forename: P
authors.initials: P
authors.lastname: Sedmera
authors.forename: M
authors.initials: M
authors.lastname: Ryska
mesh_terms: D000595:Amino Acid Sequence; D001880:Boranes / Q000737:chemistry*; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D003524:Cyclosporins / Q000032:analysis / Q000138:chemical synthesis / Q000737:chemistry*; D006868:Hydrolysis; D000432:Methanol; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D001880:Boranes; D003524:Cyclosporins; D009842:Oligopeptides; C021274:boron trifluoride; D000432:Methanol