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

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Author(s): Jian Chen | Liang Bin Hu | Wei Zhou | Shao Hua Yan | Jing Dong Yang | Yan Feng Xue | Zhi Qi Shi

Journal: International Journal of Molecular Sciences
ISSN 1422-0067

Volume: 11;
Issue: 3;
Start page: 896;
Date: 2010;
Original page

Keywords: degradation | microcystin-LR | microcystin-RR | cyanobacteria | EMS | mlrA

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.
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