Journal of Microbiology

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The β‑Lactamase Activity at the Community Level Confers β‑Lactam Resistance to Bloom‑Forming Microcystis aeruginosa Ce: Yerim Park , Wonjae Kim , Minkyung Kim , Woojun Park; J. Microbiol. 2023;61(9):807-820. Published online October 18, 2023; DOI: https://doi.org/10.1007/s12275-023-00082-0

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Many freshwater cyanobacteria, including Microcystis aeruginosa, lack several known antibiotic resistance genes; however, both axenic and xenic M. aeruginosa strains exhibited high antibiotic resistance against many antibiotics under our tested concentrations, including colistin, trimethoprim, and kanamycin. Interestingly, axenic PCC7806, although not the xenic NIBR18 and NIBR452 strains, displayed susceptibility to ampicillin and amoxicillin, indicating that the associated bacteria in the phycosphere could confer such antibiotic resistance to xenic strains. Fluorescence and scanning electron microscopic observations revealed their tight association, leading to possible community-level β-lactamase activity. Combinatory treatment of ampicillin with a β-lactamase inhibitor, sulbactam, abolished the ampicillin resistance in the xenic stains. The nitrocefin-based assay confirmed the presence of significant community-level β-lactamase activity. Our tested low ampicillin concentration and high β-lactamase activity could potentially balance the competitive advantage of these dominant species and provide opportunities for the less competitive species, thereby resulting in higher bacterial diversity under ampicillin treatment conditions. Non-PCR-based metagenome data from xenic NIBR18 cultures revealed the dominance of blaOXArelated antibiotic resistance genes followed by other class A β-lactamase genes (AST-1 and FAR-1). Alleviation of ampicillin toxicity could be observed only in axenic PCC7806, which had been cocultured with β-lactamase from other freshwater bacteria. Our study suggested M. aeruginosa develops resistance to old-class β-lactam antibiotics through altruism, where associated bacteria protect axenic M. aeruginosa cells.

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Sustainable control of Microcystis aeruginosa, a harmful cyanobacterium, using Selaginella tamariscina extracts
Wonjae Kim, Yerim Park, Minkyung Kim, Yeji Cha, Jaejoon Jung, Che Ok Jeon, Woojun Park
Ecotoxicology and Environmental Safety.2024; 277: 116375. CrossRef
Microcystis abundance is predictable through ambient bacterial communities: A data-oriented approach
Mingyeong Kang, Dong-Kyun Kim, Ve Van Le, So-Ra Ko, Jay Jung Lee, In-Chan Choi, Yuna Shin, Kyunghyun Kim, Chi-Yong Ahn
Journal of Environmental Management.2024; 368: 122128. CrossRef
Enhanced mechanical properties of living and regenerative building materials by filamentous Leptolyngbya boryana
Yongjun Son, Jihyeon Min, Indong Jang, Jiyoon Park, Chongku Yi, Woojun Park
Cell Reports Physical Science.2024; 5(8): 102098. CrossRef
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Microorganisms.2024; 12(11): 2121. CrossRef
Extensive Genomic Rearrangement of Catalase-Less Cyanobloom-Forming Microcystis aeruginosa in Freshwater Ecosystems
Minkyung Kim, Jaejoon Jung, Wonjae Kim, Yerim Park, Che Ok Jeon, Woojun Park
Journal of Microbiology.2024; 62(11): 933. CrossRef
Biological and Chemical Approaches for Controlling Harmful Microcystis Blooms
Wonjae Kim, Yerim Park, Jaejoon Jung, Che Ok Jeon, Masanori Toyofuku, Jiyoung Lee, Woojun Park
Journal of Microbiology.2024; 62(3): 249. CrossRef
Alleviation of H2O2 toxicity by extracellular catalases in the phycosphere of Microcystis aeruginosa
Yerim Park, Wonjae Kim, Yeji Cha, Minkyung Kim, Woojun Park
Harmful Algae.2024; 137: 102680. CrossRef

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