A comparative analysis of tellurite detoxification by members of the genus Shewanella
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ORIGINAL PAPER
A comparative analysis of tellurite detoxification by members of the genus Shewanella M. A. Valdivia‑González1,2 · W. A. Díaz‑Vásquez3 · D. Ruiz‑León4 · A. A. Becerra5 · D. R. Aguayo6 · J. M. Pérez‑Donoso7 · C. C. Vásquez1
Received: 28 July 2017 / Revised: 25 September 2017 / Accepted: 5 October 2017 © Springer-Verlag GmbH Germany 2017
Abstract The increasing industrial utilization of tellurium has resulted in an important environmental pollution with the soluble, extremely toxic oxyanion tellurite. In this context, the use of microorganisms for detoxifying tellurite or tellurium biorecovery has gained great interest. The ability of different Shewanella strains to reduce tellurite to elemental tellurium was assessed; the results showed that the reduction process is dependent on electron transport and the ∆pH gradient. While S. baltica OS155 showed the highest tellurite resistance, S. putrefaciens was the most efficient in reducing tellurite. Moreover, pH-dependent tellurite Communicated by Jorge Membrillo-Hernández. Electronic supplementary material The online version of this article (doi:10.1007/s00203-017-1438-2) contains supplementary material, which is available to authorized users. * C. C. Vásquez [email protected] 1
Laboratorio de Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Avenida Libertador Bernardo O’Higgins #3363. Estación Central, Santiago, Chile
2
Facultad de Ciencias de la Educación, Universidad Central de Chile, Santiago, Chile
3
Facultad de Ciencias de la Salud, Universidad San Sebastián, Providencia, Chile
4
Departamento de Química de los Materiales, Universidad de Santiago de Chile, Santiago, Chile
5
Facultad de Salud, Deporte y Recreación, Universidad Bernardo O’Higgins, Santiago, Chile
6
Molecular Biophysics and Bionformatics Group, Universidad Andrés Bello, Santiago, Chile
7
BioNanotechnology and Microbiology Laboratory, Universidad Andrés Bello, Santiago, Chile
transformation was associated with tellurium precipitation as tellurium dioxide. In summary, this work highlights the high tellurite reduction/detoxification ability exhibited by a number of Shewanella species, which could represent the starting point to develop friendly methods for the recovery of elemental tellurium (or tellurium dioxide). Keywords Shewanella · Tellurium · Tellurite · Antarctic · Heavy metals
Introduction Tellurium and its derivatives have been widely used in the oil-refining, electronic, optics, and sensor-generating industries (Sen et al. 2009; Tang et al. 2006; Turner et al. 2012; Wang et al. 2011). Elemental tellurium (Te0) is a relatively stable, water insoluble metalloid that displays low bioavailability and toxicity. Conversely, the tellurium oxyanion, tellurite (TeO32−), is water soluble and extremely harmful to most microorganisms, mainly Gram-negative bacteria. For instance, concentrations as low as 4 µM inhibit Escherichia coli growth (Taylor 1999; Chasteen et al. 2009). However, th
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