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Impact of lead (Pb2+) on the growth and biological activity of Serratia marcescens selected for wastewater treatment and identification of its zntR gene—a metal efflux regulator

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Abstract

Microorganisms isolated from contaminated areas play an important role in bioremediation processes. They promote heavy metal removal from the environment by adsorbing ions onto the cell wall surface, accumulating them inside the cells, or reducing, complexing, or precipitating these substances in the environment. Microorganism-based bioremediation processes can be highly efficient, low-cost and have low environmental impact. Thus, the present study aimed to select Pb2+-resistant bacteria and evaluate the growth rate, biological activity, and the presence of genes associated with metal resistance. Serratia marcescens CCMA 1010, that was previously isolated from coffee processing wastewater, was selected since was able to growth in Pb2+ concentrations of up to 4.0 mM. The growth rate and generation time did not differ from those of the control (without Pb2+), although biological activity decreased in the first hour of exposure to these ions and stabilized after this period. The presence of the zntR, zntA and pbrA genes was analysed, and only zntR was detected. The zntR gene encodes a protein responsible for regulating the production of ZntA, a transmembrane protein that facilitates Pb2+ extrusion out of the cell. S. marcescens CCMA 1010 demonstrated a potential for use as bioindicator that has potential to be used in bioremediation processes due to its resistance to high concentrations of Pb2+, ability to grow until 24 h of exposure, and possession of a gene that indicates the existence of mechanisms associated with resistance to lead (Pb2+).

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Acknowledgements

The authors thank Brazilian agencies Conselho Nacional de Desenvolvimento Científico e Tecnológico do Brasil (CNPQ), Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for scholarship, as well as Centro de Ciências do Mar (CCMAR) through projects UIDB/04326/2020), (UIDP/04326/2020) and (LA/P/0101/2020) and FCT co-financed by the Algarve´s Regional Operational Program (CRESC Algarve 2020) through Portugal 2020 and European Regional Development Fund (FEDER), under the project METALCHEMBIO (no. 29251).

Funding

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Centro de Ciências do Mar (CCMAR) (UIDB/04326/2020), (UIDP/04326/2020) and (LA/P/0101/2020). Funds from FCT co-financed by the Algarve´s Regional Operational Program (CRESC Algarve 2020) through Portugal 2020 and European Regional Development Fund (FEDER), under the project METALCHEMBIO (no. 29251).

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All authors contributed to the study conception and design. The first draft of the manuscript was written, reviewed, and edited by GMRF that was also responsible for material preparation, methodology development, data collection, validation data and formal data evaluation. All authors commented on previous versions of the manuscript. JFP was responsible for material preparation, methodology development, data collection, validation data and formal data evaluation. All authors commented on previous versions of the manuscript. LSR made critical, specific comments, reviewed the presentation of the data, and edited the manuscript. JDC supervised Gustavo Ferreira in the search for gene sequences in world databases, the design of primers, the optimization of PCR conditions, the analysis and selective trimming of DNA sequences and their alignment and contigs construction, as well as in the search of Open Reading Frames (ORFs). MCC supervised Gustavo Ferreira and made critical, specific comments, reviewed the presentation of the data, and edited the manuscript. RFS made critical, specific comments, reviewed the presentation of the data, and edited the manuscript. CFS supervised Gustavo Ferreira in whole experiments period in Brazil, also performed the original writing of the manuscript, supervision, and project administration. All authors read and approved the final manuscript.

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Correspondence to Cristina Ferreira Silva.

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dos Reis Ferreira, G.M., Pires, J.F., Ribeiro, L.S. et al. Impact of lead (Pb2+) on the growth and biological activity of Serratia marcescens selected for wastewater treatment and identification of its zntR gene—a metal efflux regulator. World J Microbiol Biotechnol 39, 91 (2023). https://doi.org/10.1007/s11274-023-03535-1

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  • DOI: https://doi.org/10.1007/s11274-023-03535-1

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