%0 Journal Article %A Slepova, Tatiana V. %A Sokolova, Tatyana G. %A Kolganova, Tatyana V. %A Tourova, Tatyana P. %A Bonch-Osmolovskaya, Elizaveta A. %T Carboxydothermus siderophilus sp. nov., a thermophilic, hydrogenogenic, carboxydotrophic, dissimilatory Fe(III)-reducing bacterium from a Kamchatka hot spring %D 2009 %J International Journal of Systematic and Evolutionary Microbiology, %V 59 %N 2 %P 213-217 %@ 1466-5034 %R https://doi.org/10.1099/ijs.0.000620-0 %K AQDS, 9,10-anthraquinone 2,6-disulfonate %I Microbiology Society, %X A novel anaerobic, thermophilic, Fe(III)-reducing, CO-utilizing bacterium, strain 1315T, was isolated from a hot spring of Geyser Valley on the Kamchatka Peninsula. Cells of the new isolate were Gram-positive, short rods. Growth was observed at 52–70 °C, with an optimum at 65 °C, and at pH 5.5–8.5, with an optimum at pH 6.5–7.2. In the presence of Fe(III) or 9,10-anthraquinone 2,6-disulfonate (AQDS), the bacterium was capable of growth with CO and yeast extract (0.2 g l−1); during growth under these conditions, strain 1315T produced H2 and CO2 and Fe(II) or AQDSH2, respectively. Strain 1315T also grew by oxidation of yeast extract, glucose, xylose or lactate under a N2 atmosphere, reducing Fe(III) or AQDS. Yeast extract (0.2 g l−1) was required for growth. Isolate 1315T grew exclusively with Fe(III) or AQDS as an electron acceptor. The generation time under optimal conditions with CO as growth substrate was 9.3 h. The G+C content of the DNA was 41.5±0.5 mol%. 16S rRNA gene sequence analysis placed the organism in the genus Carboxydothermus (97.8 % similarity with the closest relative). On the basis of physiological features and phylogenetic analysis, it is proposed that strain 1315T should be assigned to a novel species, Carboxydothermus siderophilus sp. nov., with the type strain 1315T (=VKPM 9905BT =VKM B-2474T =DSM 21278T). %U https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijs.0.000620-0