Characterization of Desulfomicrobium escambium sp. nov. and proposal to assign Desulfovibrio desulfuricans strain Norway 4 to the genus Desulfomicrobium |
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| Authors: | Barbara R Sharak Genthner Gary Mundfrom Richard Devereux |
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| Institution: | (1) U.S. Environmental Protection Agency, Environmental Research Laboratory, Technical Resources, Inc., 32561 Gulf Breeze, FL, USA;(2) Microbial Ecology and Biotechnology Branch, Environmental Research Laboratory, U.S. Environmental Protection Agency, 32561 Gulf Breeze, FL, USA;(3) Department of Civil and Mineral Engineering, University of Minnesota, 55455 Minneapolis, MN, USA;(4) c/o U.S. EPA Environmental Research Laboratory, Avanti Corporation, 1 Sabine Island Drive, 32561 Gulf Breeze, FL, USA |
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| Abstract: | A sulfate-reducing bacterium, designated strain ESC1, was isolated and found to be a new species. Strain ESC1 is a strictly anaerobic, gram-negative, non-sporeforming, motile, short, round-ended rod often occurring in pairs. Of 31 fermentative substrates tested, only pyruvate was utilized. Sulfate enhanced growth with pyruvate and allowed growth with ethanol, lactate, formate and hydrogen. Both sulfate and thiosulfate were reduced. Lactate was incompletely oxidized to acetate and CO2. The strain was desulfoviridin negative. The G+C content is 59.9%. These data suggested placement of strain ESC1 in the genus Desulfomicrobium. Comparative 16S rRNA analysis showed that strain ESC1 shares 98% rRNA sequence similarity with Desulfomicrobium baculatum and Desulfovibrio desulfuricans strain Norway 4. The latter two strains shared greater than 99% 16S rRNA sequence similarity. Strain ESC1 has been designated as the new species Desulfomicrobium escambium. We also recommend that D. desulfuricans strain Norway 4 be considered for reclassification as a Desulfomicrobium species. |
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| Keywords: | Desulfomicrobium escambium New bacterial species Sulfate-reducing bacteria 16S rRNA analysis |
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