Journal
PHYTOCHEMISTRY
Volume 55, Issue 5, Pages 383-387Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0031-9422(00)00335-6
Keywords
microcystin; hepatotoxin; Microcystis; cyanobacteria
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[D-Leu(1)]Microcystin-LR was identified as the most abundant microcystin from a laboratory strain of the cyanobacterium Microcystis sp. isolated from a hepatotoxic Microcystis bloom from brackish waters in the Patos Lagoon estuary, southern Brazil. Toxicity of [D-Leu(1)]microcystin-LR, according to bioassay and protein phosphatase inhibition assay, was similar to that of the commonly-occurring microcystin-LR, which was not detectable in the Patos Lagoon laboratory isolate. This is the first report of a microcystin containing [D-Leu(1)] in the cyclic heptapeptide structure of these potent cyanobacterial toxins. (C) 2000 Elsevier Science Ltd. All rights reserved.
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