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Hellmann S, García-Cancela P, Alonso-Fernández S, Corte-Rodríguez M, Bettmer J, Manteca A, Merten D, Gil-Díaz T, Schäfer T, Montes-Bayón M. Single cell ICP-MS to evaluate the interaction behaviour for Cd, Ce and U with Streptomyces coelicolor spores. Chemosphere 2024; 347:140633. [PMID: 37951404 DOI: 10.1016/j.chemosphere.2023.140633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 11/03/2023] [Accepted: 11/05/2023] [Indexed: 11/14/2023]
Abstract
Streptomyces are important soil bacteria used for bioremediation of metal-contaminated soils, however, it is still unknown how metal-selective Streptomyces are and which mechanisms are involved during their capture. In this work, we exposed S. coelicolor spores to environmentally relevant concentrations (0.1, 1, 10, 100 μM) of Ce, U and Cd in solid medium for one week to investigate the uptake behaviour of hyphae in the newly formed spores. Additionally, metal adsorption onto the spores was explored by incubating inactive, ungerminated spores for one day in aqueous metal solution. The spore-washing treatment was key to distinguishing between strongly spore-associated (e.g. incorporation; Tris-EDTA buffer) and weakly spore-associated metals (Tris buffer alone minus Tris-EDTA). Single cell (sc) ICP-MS was used to quantify metal-associated content in individual spores. Our results revealed element-specific adsorption onto inactive spores showing that out of the total metal exposure, both strongly (Ce: 58%; U: 54%; Cd: 28%) and weakly (Ce: 12%; U: 1%; Cd: 18%) adsorbed metals occur. However, scICP-MS showed that from metal-amended solid medium, only Ce and U were strongly spore-associated (averages 0.040 and 0.062 fg spore-1 for 10 μM exposures, respectively) while Cd was below the limit of detection (< 0.006 fg spore-1). We propose that hyphae only metabolically interact with Ce in a controlled manner but uncontrolled with U, as 66-73% Ce and only 2-4% U were inherited from adsorbed content. We conclude that Streptomyces spore-metal interaction starts with a relevant adsorption step of Ce, U and Cd as presented for aqueous conditions. If spores start to germinate, hyphae are capable of effectively encapsulating Ce and U, but not Cd. This study brings light into the still unknown field of metal interactions with Streptomyces and applied understanding for more efficient and metal-specific use of Streptomyces in bioremediation of metal-polluted soils.
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Affiliation(s)
- Steffen Hellmann
- Institute of Geosciences, Friedrich Schiller University Jena, Burgweg 11, 07749, Jena, Germany; International Max Planck Research School for Global Biogeochemical Cycles, Max Planck Institute for Biogeochemistry, Department of Biogeochemical Processes, Hans-Knöll-Straße 10, 07745, Jena, Germany
| | - Paula García-Cancela
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, Julian Clavería 8, 33006, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. Del Hospital Universitario s/n, 33011, Oviedo, Spain
| | - Sergio Alonso-Fernández
- Área de Microbiología, Departamento de Biología Funcional, IUOPA and ISPA, Facultad de Medicina, Universidad de Oviedo, 33006, Oviedo, Spain
| | - Mario Corte-Rodríguez
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, Julian Clavería 8, 33006, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. Del Hospital Universitario s/n, 33011, Oviedo, Spain
| | - Jörg Bettmer
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, Julian Clavería 8, 33006, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. Del Hospital Universitario s/n, 33011, Oviedo, Spain
| | - Angel Manteca
- Área de Microbiología, Departamento de Biología Funcional, IUOPA and ISPA, Facultad de Medicina, Universidad de Oviedo, 33006, Oviedo, Spain
| | - Dirk Merten
- Institute of Geosciences, Friedrich Schiller University Jena, Burgweg 11, 07749, Jena, Germany
| | - Teba Gil-Díaz
- Institute of Applied Geosciences (AGW), Karlsruhe Institute of Technology (KIT), Adenauerring 20b, 76131, Karlsruhe, Germany
| | - Thorsten Schäfer
- Institute of Geosciences, Friedrich Schiller University Jena, Burgweg 11, 07749, Jena, Germany.
| | - María Montes-Bayón
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, Julian Clavería 8, 33006, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. Del Hospital Universitario s/n, 33011, Oviedo, Spain.
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