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Anaerobranca zavarzinii sp. nov., an anaerobic, alkalithermophilic bacterium isolated from Kamchatka thermal fields

¹ Winogradsky Institute of Microbiology RAS, 117312 Moscow, Russia
² GE Healthcare, Piscataway, NJ 08855, USA
³ Department of Microbiology, University of Georgia, Athens, GA 30602-2605, USA

Correspondence
Juergen Wiegel
jwiegel{at}uga.edu

A novel obligately anaerobic, alkalithermophilic, chemo-organotrophic bacterium was isolated from a small and very shallow geothermally heated pool at Pushino (Kamchatka, Far East Russia). The bacterium, designated strain JW/VK-KS5Y^T, was a Gram staining negative, Gram type positive rod. The cells were sometimes branched, with a tendency to grow in long chains, and were non-sporulating and non-motile. The shortest observed doubling time was 28 min when the novel strain was grown at 54–60 °C in 120 mM sodium carbonate-containing medium at pH^25 °C 8.5–9.0. The novel bacterium grew on yeast extract and soytone as sole carbon and energy sources but could also use fumarate, thiosulfate and sulfur as electron acceptors. The DNA G+C content was 32.5 mol%. Based on phylogenetic, DNA–DNA hybridization and phenotypic data, it was concluded that isolate JW/VK-KS5Y^T (=VKM B-2436^T=DSM 18970^T) represents the type strain of a novel species, Anaerobranca zavarzinii sp. nov.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Anaerobranca zavarzinii JW/VK-KS5Y^T is EF190921.

A supplementary table showing cosubstrate and electron acceptor utilization by strain JW/VK-KS5Y^T along with appropriate product profiles is available with the online version of this paper.