title: The peptide toxin of the cyanobacterium Microcystis aeruginosa PCC 7941. Isolation and analysis by nuclear magnetic resonance and fast atom bombardment mass spectroscopy.
abstract: Toxin was obtained from the cyanobacterium Microcystis aeruginosa PCC7941 by extracting freeze-dried cells with water-saturated, acidified n-butanol, diethyl ether-water distribution, reversed-phase thin-layer chromatography and silica high-performance liquid chromatography (HPLC). Two toxic peptide fractions resulted from HPLC. One of these fractions was analyzed by UV and NMR spectroscopy, amino acid analysis and fast atom bombardment mass spectroscopy. The following amino acid analysis and fast atom bombardment mass spectroscopy. The following amino acids were identified: beta-methyl-Asp, Thr, Glu, Ala, Val, Leu, Phe, Arg, N-methyldehydro-Ala and 3-amino-9-methoxy-2,6,8-trimethyl-10-phenyldeca-4,6-dienoic acid. Yet the mass spectroscopic data showed that the fraction was still composed of several, most likely cyclic peptides that did not stain with ninhydrin.
authors.affiliation: Institut für Biologie II, Mikrobiologie, der Universität, Freiburg i. Br., F.R.G.
authors.forename: I M
authors.initials: IM
authors.lastname: Birk
authors.forename: U
authors.initials: U
authors.lastname: Matern
authors.forename: I
authors.initials: I
authors.lastname: Kaiser
authors.forename: C
authors.initials: C
authors.lastname: Martin
authors.forename: J
authors.initials: J
authors.lastname: Weckesser
mesh_terms: D000596:Amino Acids / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D046931:Microcystis / Q000378:metabolism*; D010455:Peptides / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet; D014118:Toxins, Biological / Q000032:analysis*
chemical_list: D000596:Amino Acids; D010455:Peptides; D014118:Toxins, Biological