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Int. J. Environ. Res. Public Health 2017, 14(10), 1187; doi:10.3390/ijerph14101187

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
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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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Abstract

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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