Abstract
Despite current remediation efforts, arsenic contamination in water sources is still a major health problem, highlighting the need for new approaches. In this work, strains of the nonpathogenic and highly arsenic-resistant bacterium Corynebacterium glutamicum were used as inexpensive tools to accumulate inorganic arsenic, either as arsenate (AsV) or arsenite (AsIII) species. The assays made use of “resting cells” from these strains, which were assessed under well-established conditions and compared with C. glutamicum background controls. The two mutant AsV-accumulating strains were those used in a previously published study: (i) ArsC1/C2, in which the gene/s encoding the mycothiol-dependent arsenate reductases is/are disrupted, and (ii) MshA/C mutants unable to produce mycothiol, the low molecular weight thiol essential for arsenate reduction. The AsIII-accumulating strains were either those lacking the arsenite permease activities (Acr3-1 and Acr3-2) needed in AsIII release or recombinant strains overexpressing the aquaglyceroporin genes (glpF) from Corynebacterium diphtheriae or Streptomyces coelicolor, to improve AsIII uptake. Both genetically modified strains accumulated 30-fold more AsV and 15-fold more AsIII than the controls. The arsenic resistance of the modified strains was inversely proportional to their metal accumulation ability. Our results provide the basis for investigations into the use of these modified C. glutamicum strains as a new bio-tool in arsenic remediation efforts.
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Acknowledgements
AFV and EO were recipients of fellowships from the Junta de Castilla y León (Spain). This work was financially supported by grants from Junta de Castilla y León, Spain (ref. 2014/211330), and the HOA project of the Vrije Universiteit Brussel (Brussels). We thank Professor De Xoyse (H.P.A., London, UK), for providing C. diphtheriae DNA.
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Villadangos, A.F., Ordóñez, E., Pedre, B. et al. Engineered coryneform bacteria as a bio-tool for arsenic remediation. Appl Microbiol Biotechnol 98, 10143–10152 (2014). https://doi.org/10.1007/s00253-014-6055-2
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DOI: https://doi.org/10.1007/s00253-014-6055-2