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Antimicrobial activity against Microcystis aeruginosa and degradation of microcystin-LR by bacteria isolated from Antarctica

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Abstract

Cyanobacteria massive proliferations are common in freshwater bodies worldwide, causing adverse effects on aquatic ecosystems and public health. Numerous species develop blooms. Most of them correspond to the toxic microcystin-producing cyanobacterium Microcystis aeruginosa. Microorganisms recovered from Antarctic environment can be considered an unexploited source of antimicrobial compounds. Data about their activity against cyanobacteria are scant or inexistent. This study aimed to evaluate the capacity of Antarctic bacteria to inhibit the proliferation of M. aeruginosa BCPUSP232 and to degrade microcystin-LR (MC-LR). Cell-free extracts of seventy-six bacterial strains were initially tested for antimicrobial activity. Unidentified (UN) strains 62 and ES7 and Psychromonas arctica were able to effectively lyse M. aeruginosa. Eight strains showed MIC ranging from 0.55 to 3.00 mg mL−1, with ES7 showing the best antimicrobial activity. Arthrobacter sp. 443 and UN 383 were the most efficient in degrading MC-LR, with 24.87 and 23.85% degradation, respectively. To our knowledge, this is the first report of antimicrobial and MC-LR degradation activities by Antarctic bacteria, opening up perspectives for their future application as an alternative or supporting approach to help mitigate cyanobacterial blooms.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank Ana Carolina Gossen from the Reservoir Division of Itaipu Binacional – Paraguay, for the support during the laboratory experiments; Maria do Carmo Bittencourt-Oliveira from the University of São Paulo, for kindly providing the BCP USP232 strain; to Luiz Henrique Rosa (UFMG-Brazil) for performing the sampling; São Paulo State Research Support Foundation (FAPESP) - Process: 2016/05640-6 and Research Productivity Grant from CNPq (Valéria Maia de Oliveira) – Process: 308955/2016-1)

Funding

This research was supported by Universidade Federal da Integração Latino-Americana – UNILA.

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GRSB analyzed data, designed research, conducted experiments, and wrote the manuscript. SPFB conducted experiments. VMO analyzed data, designed research, and wrote the manuscript. MRZP analyzed data, designed research, and wrote the manuscript.

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Correspondence to Michel Rodrigo Zambrano Passarini.

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The authors declare no competing interests.

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Responsible Editor: Vitor Vasconcelos

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Benegas, G.R.S., Bernal, S.P.F., de Oliveira, V.M. et al. Antimicrobial activity against Microcystis aeruginosa and degradation of microcystin-LR by bacteria isolated from Antarctica. Environ Sci Pollut Res 28, 52381–52391 (2021). https://doi.org/10.1007/s11356-021-14458-5

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  • DOI: https://doi.org/10.1007/s11356-021-14458-5

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