Effects of cell-bound microcystins on survival and feeding of Daphnia spp

Article Abstract:

The toxic effects of microcystins on Daphnia spp. depends on the ingestion rate rather than a difference in susceptibility to the toxins. The microcystins are usually ingested in cell-bound form, and Daphnia apparently cannot distinguish between microcystin-producing cells and cells that do not contain microcystins.

Bacterial toxins, Marine invertebrates

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Inactivation of an ABC transporter gene, mcyH, results in loss of microcystin production in the cyanobacterium microcystis aeruginosa PCC 7806

Article Abstract:

The bioinformatic and mutational analyses of McyH is discussed and functional predictions for the hypothetical protein are offered. It is predicted that McyH functions as a microcystin exporter and is intimately associated with the microcystin biosynthesis pathway.

Science & research, Genetics, Bacterial proteins, Amino acids, Properties

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Role of microcystins in poisoning and food ingestion inhibition of Daphnia galeata caused by the cyanobacterium Microcystis aeruginosa

Article Abstract:

Research was conducted to examine the role of microcystins on Daphnia galeata. A comparison of the microcystin-producing wild-type strain Microcystic aeruginosa PCC7806 with a mcy- PCC7806 mutant, which had no ability to synthesize any variant of microcystin due to mutation of a microcystin synthetase gene, was performed. Results indicate that daphnid poisoning in animals fed with wild-type strain PCC7806 may possibly be caused by microcystins.

Food poisoning, Ingestion disorders

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