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Microcystins are a group of cyclic heptapeptide hepatotoxins produced by the cyanobacteria. Two microcystin-degrading strains of bacteria (MG‒ and MG‒ ) were isolated from a monoxenic culture of Monas guttula preying on Microcystis viridis. Both strains were related to Sphingopyxis and Novosphingobium groups based on phylogenetic analysis of S rDNA. Degradation of microcystin by these strains was tested under the following conditions: temperature from to °C, pH from . to . , three diff erent microcystin analogs and initial microcystin concentrations from to μg・l . The rate of microcystin RR degradation by strain MG‒ signifi cantly increased at °C, whereas the eff ect of temperature on the degradation rate by strain MG‒ was small. Both strains could degrade microcystin under alkaline pH. Both strains could degrade microcystin RR, YR and LR. The degradation rate of microcystin RR by the two strains was faster than the degradation rates of microcystin YR and LR. Both strains could degrade microcystin LR at all initial concentrations.

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Degradation of the Cyanobacterial Hepatotoxin Microcystin by Bacteria Isolated from a Monoxenic Culture of the Flagellate &lt;i&gt;Monas guttula&lt;/i&gt;