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Int J Syst Evol Microbiol 56 (2006), 2349-2351; DOI  10.1099/ijs.0.64503-0
© 2006 International Union of Microbiological Societies

Reclassification of Thermoterrabacterium ferrireducens as Carboxydothermus ferrireducens comb. nov., and emended description of the genus Carboxydothermus

A. I. Slobodkin1, T. G. Sokolova1, A. M. Lysenko1 and J. Wiegel2

1 Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, 117 312 Moscow, Russia
2 Department of Microbiology, University of Georgia, Athens, GA 30602, USA

Correspondence
A. I. Slobodkin
aslobodkin{at}hotmail.com

Similarities in phylogeny and metabolic properties between the type species of two monospecific genera of thermophilic anaerobic bacteria, Carboxydothermus hydrogenoformans and Thermoterrabacterium ferrireducens, and analysis of their recently available 16S rRNA gene sequences warranted clarification of their taxonomic positions. We have determined that the value of DNA–DNA hybridization between the type strains is 53 %. Additional physiological studies revealed that C. hydrogenoformans Z-2901T is capable of Fe(III) reduction with H2 as an electron donor and ferrihydrite as an electron acceptor. T. ferrireducens JW/AS-Y7T is able to grow and utilize CO with ferrihydrite as an electron acceptor without hydrogen or acetate production. We therefore reclassify Thermoterrabacterium ferrireducens as Carboxydothermus ferrireducens comb. nov. (type strain JW/AS-Y7T=DSM 11255T=VKM B-2392T). The description of the genus Carboxydothermus is emended to include such important physiological properties as growth on organic compounds and capacity for Fe(III) reduction.






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