Autoinducer-2 promotes microbial degradation of microcystin-LR by Leuconostoc mesenteroides BSH-02

IF 2.3 3区 生物学 Q3 MICROBIOLOGY Archives of Microbiology Pub Date : 2024-12-23 DOI:10.1007/s00203-024-04218-7
Chan-Soo Ock, Ye-Eun Oh, Suyoung Song, Sang-Gun No, Hyung-Ki Do, Cher-won Hwang
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Abstract

Microcystin-LRs (MC-LR) produced by harmful cyanobacterial blooms (HCBs) pose significant hepatotoxic risks to both the environment and public health. Despite the identification and characterization of a limited number of MC-LR degrading bacteria, the challenge of safely removing MC-LRs from freshwater systems without disrupting aquatic ecosystems remains substantial. This study focused on the isolation of lactic acid bacteria from Bapshikhe, a traditional Korean fermented food, and investigated the mechanisms underlying the degradation of MC-LRs by these bacteria. This study also tested the hypothesis that cell wall-associated proteinases in probiotic bacteria play crucial roles in the degradation process. In addition, we verified the hypothesis that the MC-LR degradation mechanism of lactic is correlated with AI-2, a QS-inducing factor. MC-LR degrading bacteria, BSH-02, were successfully isolated from Bapshike, a Korean traditional fermented food, and identified by phylogenetic analysis as Leuconostoc mesenteroides. The BSH-02 strain effectively suppressed cyanobacterial blooms and degraded MC-LR. Ethylenediaminetetraacetic Acid (EDTA), a primary proteinase inhibitor of the BSH-02 strain, reduced the rate of microcystin removal. Based on these studies, the MC-degrading mechanism of BSH-02 was found to involve a metallopeptidase, aligning with mechanisms previously described in other studies. In addition, a correlation between metallopeptidases and AI-2 was identified using RT-qPCR. To the best of our knowledge, this is the first report of Leuconostoc mesenteroides degrading MC-LR. These findings suggest that Leuconostoc mesenteroides strain BSH-02 has high potential for the bioremediation of MC LR-contaminated water bodies.

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来源期刊
Archives of Microbiology
Archives of Microbiology 生物-微生物学
CiteScore
4.90
自引率
3.60%
发文量
601
审稿时长
3 months
期刊介绍: Research papers must make a significant and original contribution to microbiology and be of interest to a broad readership. The results of any experimental approach that meets these objectives are welcome, particularly biochemical, molecular genetic, physiological, and/or physical investigations into microbial cells and their interactions with their environments, including their eukaryotic hosts. Mini-reviews in areas of special topical interest and papers on medical microbiology, ecology and systematics, including description of novel taxa, are also published. Theoretical papers and those that report on the analysis or ''mining'' of data are acceptable in principle if new information, interpretations, or hypotheses emerge.
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