Influence of transition metals on Streptomyces coelicolor and S. sioyaensis and generation of chromate-reducing mutants
Language English Country United States Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Drug Resistance, Bacterial * MeSH
- Biotransformation MeSH
- Chromates metabolism toxicity MeSH
- Hydrogen-Ion Concentration MeSH
- Metals metabolism toxicity MeSH
- Culture Media chemistry MeSH
- Environmental Pollutants metabolism toxicity MeSH
- Microbial Viability drug effects MeSH
- Mutation * MeSH
- Oxidation-Reduction MeSH
- Streptomyces drug effects growth & development metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Chromates MeSH
- Metals MeSH
- Culture Media MeSH
- Environmental Pollutants MeSH
Bacteria-assisted bioremediation is widely recognized as a low-cost method to minimize the consequences of soil pollution with toxic metals originating from industrial sites. Strains used in bioremediation have to deal with high metal load via biosorption, reduction, bioprecipitation, metal sequestration, and/or chelation. Actinobacteria, and streptomycetes in particular, are considered a perspective group for bioremediation as natural soil inhabitants with extensive secondary metabolism. Nevertheless, there is no reference information on survival of the model streptomycetes in the presence of the most abundant metal pollutants. Also, there are no reports describing the selection approaches towards improvement of bioremediation properties. In this work, the resistance of Streptomyces coelicolor M145 and Streptomyces sioyaensis Lv81 to certain transition metals and their growth under different pH values are described for the first time. Spontaneous chromate-resistant S. sioyaensis Lv81-138 strain was selected in the course of this work. Strain Lv81-138 is the most efficient actinobacterial Cr(VI) reducer reported so far, capable of converting 12 mmol/L of Cr(VI) into Cr(III) in a medium supplemented with 50 mmol/L K2CrO4.
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