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International Journal of Systematic and Evolutionary Microbiology, Vol 51, 141-149, Copyright © 2001 by Society for General Microbiology
TG Sokolova, JM Gonzalez, NA Kostrikina, NA Chernyh, TP Tourova, C Kato, EA Bonch-Osmolovskaya and FT Robb
Institute of Microbiology, Russian Academy of Sciences, Prospekt 60 Let Oktyabrya, 7/2, Moscow, 117811, Russia
A new anaerobic, thermophilic, CO-utilizing marine bacterium, strain JM(T), was isolated from a submarine hot vent in Okinawa Trough. Cells of strain JM(T) were non-motile thin straight rods, sometimes branching, with a cell wall of the Gram-positive type, surrounded with an S-layer. Chains of three to five cells were often observed. The isolate grew chemolithotrophically on CO, producing equimolar quantities of H(2) and CO(2) (according to the equation CO+H(2)O -> CO(2)+H(2)) and organotrophically on peptone, yeast extract, starch, cellobiose, glucose, galactose, fructose and pyruvate, producing H(2), acetate and CO(2). Growth was observed from 50 to 80 degrees C with an optimum at 70 degrees C. The optimum pH was 6.8--7.1. The optimum concentration of sea salts in the medium was 20.5--25.5 g l(-1). The generation time under optimal conditions was 7.1 h. The DNA G+C content was 33 mol%. Growth of isolate JM(T) was not inhibited by penicillin, but ampicillin, streptomycin, kanamycin and neomycin completely inhibited growth. The results of 16S rDNA sequence analysis revealed that strain JM(T) belongs to the Thermoanaerobacter phylogenetic group within the Bacillus--Clostridium subphylum of Gram-positive bacteria but represents a separate branch of this group. On the basis of morphological and physiological features and phylogenetic data, this isolate should be assigned to a new genus, for which the name Carboxydobrachium is proposed. The type species is Carboxydobrachium pacificum; the type strain is JM(T) (=DSM 12653(T)).
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