title: Partial structural determination of hepatotoxic peptides from Microcystis aeruginosa (cyanobacterium) collected in ponds of central China.
abstract: Waterbloom samples of the colonial cyanobacterium Microcystis aeruginosa, collected in fish ponds at the Hydrobiological Institute, Wuhan, People's Republic of China, were hepatotoxic to mice. Lyophilized cells had an LD50 (i.p. mouse; 40 mg/kg) and signs of poisoning similar to that reported for other cyanobacterial hepatotoxic peptides. Two toxins, with an LD50 (i.p. mouse) of 40 and 150 micrograms/kg, were isolated using gel filtration and high performance liquid chromatography. The amino acid composition and mol. wt (994) of the 40 micrograms/kg toxin was the same as that for microcystin-LR, while the 150 micrograms/kg toxin had an amino acid composition and mol. wt (1048) different from any of the reported cyanobacteria heptapeptide toxins reported to date.
authors.affiliation: Department of Biological Sciences, Wright State University, Dayton, OH 45435.
authors.forename: W W
authors.initials: WW
authors.lastname: Carmichael
authors.forename: J W
authors.initials: JW
authors.lastname: He
authors.forename: J
authors.initials: J
authors.lastname: Eschedor
authors.forename: Z R
authors.initials: ZR
authors.lastname: He
authors.forename: Y M
authors.initials: YM
authors.lastname: Juan
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001427:Bacterial Toxins; D002681:China; D002851:Chromatography, High Pressure Liquid; D000087522:Cyanobacteria Toxins; D007928:Lethal Dose 50; D008387:Marine Toxins / Q000032:analysis / Q000633:toxicity*; D013058:Mass Spectrometry; D051379:Mice; D052998:Microcystins; D046931:Microcystis / Q000032:analysis*; D010455:Peptides / Q000032:analysis / Q000633:toxicity*
chemical_list: D000596:Amino Acids; D001427:Bacterial Toxins; D000087522:Cyanobacteria Toxins; D008387:Marine Toxins; D052998:Microcystins; D010455:Peptides