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Int. J. Environ. Res. Public Health 2017, 14(10), 1187;

A Novel and Native Microcystin-Degrading Bacterium of Sphingopyxis sp. Isolated from Lake Taihu

Key Laboratory of Environmental Medicine Engineering of Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China
Authors to whom correspondence should be addressed.
Received: 22 August 2017 / Revised: 28 September 2017 / Accepted: 30 September 2017 / Published: 6 October 2017
(This article belongs to the Special Issue Microbiological Evaluation of Wastewater Treatment)
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A native, highly efficient microcystin-LR (MC-LR)-degrading bacterium named a7 was isolated from Lake Taihu and identified as Sphingopyxis sp. by 16S rDNA sequence analysis. The strain a7 could totally degrade MC-LR at a rate of 3.33 mg/(L•h), as detected by high-performance liquid chromatography (HPLC). The mlrA, mlrC, and mlrD genes were detected in the strain a7 by sequence analysis. Tetrapeptide and Adda—which are the middle metabolites of MC-LR—were analyzed via liquid chromatography time-of-flight mass spectrometry (LC-TOF-MS) during degradation. These metabolites were degraded completely, which suggested that the native Sphingopyxis sp. a7 was highly efficient in MC-LR degradation under bench conditions. Thus, strain a7 exhibited a significant potential application for bioremediation in water bodies contaminated by MC-LR produced by harmful cyanobacterial blooms. View Full-Text
Keywords: microcystin; biodegradation; Sphingopyxis sp.; Lake Taihu microcystin; biodegradation; Sphingopyxis sp.; Lake Taihu

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Zhang, J.; Lu, Q.; Ding, Q.; Yin, L.; Pu, Y. A Novel and Native Microcystin-Degrading Bacterium of Sphingopyxis sp. Isolated from Lake Taihu. Int. J. Environ. Res. Public Health 2017, 14, 1187.

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