期刊
JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH-PART A-CURRENT ISSUES
卷 82, 期 21, 页码 1120-1128出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/15287394.2019.1699345
关键词
Microcystin-LR; biodegradation; anaerobic; Enterobacter
资金
- National Natural Science Foundation [81773393, 81502787]
- Central South University Innovation Driven Project [20170027010004]
- Key Research and Development Projects in Hunan Province [2019SK2041, 2018WK2013]
- Fundamental Research Funds for the Central Universities of Central South University [2018zzts858, CX20190241]
- Ministry of Science and Technology of China [2015FY111100, 2016YFC0900802]
Microcystin-LR (MC-LR), a known hepatotoxin present in drinking water, and contaminated food and algal dietary supplements poses a threat to environmental and public health and thus needs to be removed. Previously microbial aerobic degradation was considered the predominant catabolic process for MC-LR inactivation, but the potential role of anaerobic microbes still needs to be determined. In our study an anaerobic MC-degrading bacterium Enterobacter sp. YF3 was isolated and identified that was capable of degrading MC-LR. Under optimal conditions the anaerobic Enterobacter sp. YF3 displayed a MC-degrading rate of 0.34 mu g/ml/day. This process was dependent on temperature, pH and MC-LR concentration. Further the extracellular secretion of metabolites of anaerobic bacterium degraded MC-LR at 0.22 mu g/ml/day. The parent MC-LR as well as two MC-degrading products was identified by high performance liquid chromatography (HPLC). The anaerobic MC-degrading Enterobacter sp. bacterium metabolized MC-LR independent of MC-degrading genes mlrABCD. Data indicate that anaerobic Enterobacter sp. YF3 produces MC-degrading products via a pathway that acts independently of mlrABCD genes which may add to the arsenal of bacteria to degrade microcystins.
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