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Int. J. Mol. Sci. 2010, 11(3), 896-911; doi:10.3390/ijms11030896
Article

Degradation of Microcystin-LR and RR by a Stenotrophomonas sp. Strain EMS Isolated from Lake Taihu, China

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1 Institute of Food Safety and Quality, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China 2 School of Food, Henan Institute of Science and Technology, Xinxiang 453003, China 3 Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China 4 Institute of Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
* Author to whom correspondence should be addressed.
Received: 6 January 2010 / Revised: 20 January 2010 / Accepted: 2 February 2010 / Published: 2 March 2010
(This article belongs to the Section Biochemistry, Molecular Biology and Biophysics)
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Abstract

A bacterial strain EMS with the capability of degrading microcystins (MCs) was isolated from Lake Taihu, China. The bacterium was tentatively identified as a Stenotrophomonas sp. The bacterium could completely consume MC-LR and MC-RR within 24 hours at a concentration of 0.7 µg/mL and 1.7 µg/mL, respectively. The degradation of MC-LR and MC-RR by EMS occurred preferentially in an alkaline environment. In addition, mlrA gene involved in the degradation of MC-LR and MC-RR was detected in EMS. Due to the limited literature this gene has rare homologues. Sequencing analysis of the translated protein from mlrA suggested that MlrA might be a transmembrane protein, which suggests a possible new protease family having unique function.
Keywords: degradation; microcystin-LR; microcystin-RR; cyanobacteria; EMS; mlrA degradation; microcystin-LR; microcystin-RR; cyanobacteria; EMS; mlrA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chen, J.; Hu, L.B.; Zhou, W.; Yan, S.H.; Yang, J.D.; Xue, Y.F.; Shi, Z.Q. Degradation of Microcystin-LR and RR by a Stenotrophomonas sp. Strain EMS Isolated from Lake Taihu, China. Int. J. Mol. Sci. 2010, 11, 896-911.

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