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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

1,3
, 2
, 1,3
, 3,4
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, 1,3
 and 1,3,*
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 Bioinorganic Chemistry)
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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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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