Mercury-resistant bacteria from permafrost sediments and prospects for their use in comparative studies of mercury resistance determinants |
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Authors: | Petrova M A Mindlin S Z Gorlenko Zh M Kaliaeva E S Soina V S Bogdanova E S |
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Affiliation: | Institute of Molecular Genetics, Russian Academy of Sciences, Moscow, 123182 Russia. petrova@img.ras.ru |
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Abstract: | Mercury-resistant bacteria were isolated from permafrost sediments of Kolyma lowland and Canada existing over five thousand to two million years. Their content was shown to vary within the range 0.001-2.9% and to depend on the amount of mercury in sampling sites (coefficient of correlation 0.75). A collection of mercury-resistant bacterial strains was created. In this collection, various representatives of both Gram-positive bacteria (Bacillus, Exiguobacterium, Micrococcus, Arthrobacter) and Gram-negative bacteria (Pseudomonas, Acinetobacter, Plesiomonas, Myxobacteriales) were identified. Most resistant bacteria were found to contain determinants homologous to mer-operons of contemporary bacteria. The isolated strains of paleobacteria are proposed to be used for a comparative structural study of contemporary and ancient plasmids and transposons carrying mercury resistance determinants. |
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