Co‐production of microcystins and aeruginopeptins by natural cyanobacterial bloom

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Abstract

<jats:title>Abstract</jats:title><jats:p>The relationship between <jats:italic>Microcystis</jats:italic> composition and the production of microcystins and nontoxic peptides in bloom cells, which was regularly collected in Lake Suwa, Japan, in the summer season from 1991 to 1994, was investigated. In order to determine the structures of the nontoxic peptides, we collected large amounts of bloom materials from the same lake on July 23, 1991, and isolated three nontoxic peptides. They were named as aeruginopeptins 917S‐A, ‐B, and ‐C, and their structures were mainly determined by a mass spectrometry/mass spectrometry (MS/MS) technique as 19‐membered cyclic depsipeptides possessing the Ahp (3‐amino‐6‐hydroxy‐2‐piperidone) moiety. An analysis of the microcystins and aeruginopeptins in the collected bloom cells and their <jats:italic>Microcystis</jats:italic> composition suggested that the <jats:italic>M. aeruginosa</jats:italic> large cell size produces both microcystins and aeruginopeptins, and the production of both compounds is genetically closely related. © 2001 John Wiley & Sons, Inc. Environ Toxicol 16: 298–305, 2001</jats:p>

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