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Candidatus Contubernalis alkalaceticum,” an Obligately Syntrophic Alkaliphilic Bacterium Capable of Anaerobic Acetate Oxidation in a Coculture with Desulfonatronum cooperativum

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Abstract

From the silty sediments of the Khadyn soda lake (Tuva), a binary sulfidogenic bacterial association capable of syntrophic acetate oxidation at pH 10.0 was isolated. An obligately syntrophic, gram-positive, spore-forming alkaliphilic rod-shaped bacterium performs acetate oxidation in a syntrophic association with a hydrogenotrophic, alkaliphilic sulfate-reducing bacterium; the latter organism was previously isolated and characterized as the new species Desulfonatronum cooperativum. Other sulfate-reducing bacteria of the genera Desulfonatronum and Desulfonatronovibrio can also act as the hydrogenotrophic partner. Apart from acetate, the syntrophic culture can oxidize ethanol, propanol, isopropanol, serine, fructose, and isobutyric acid. Selective amplification of 16S rRNA gene fragments of the acetate-utilizing syntrophic component of the binary culture was performed; it was found to cluster with clones of uncultured gram-positive bacteria within the family Syntrophomonadaceae. The acetate-oxidizing bacterium is thus the first representative of this cluster obtained in a laboratory culture. Based on its phylogenetic position, the new acetate-oxidizing syntrophic bacterium is proposed in the Candidatus status for a new genus and species: “Candidatus Contubernalis alkalaceticum.”

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Correspondence to T. N. Zhilina.

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Translated from Mikrobiologiya, Vol. 74, No. 6, 2005, pp. 800–809.

Original Russian Text Copyright © 2005 by Zhilina, Zavarzina, Kolganova, Tourova, Zavarzin.

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Zhilina, T.N., Zavarzina, D.G., Kolganova, T.V. et al.Candidatus Contubernalis alkalaceticum,” an Obligately Syntrophic Alkaliphilic Bacterium Capable of Anaerobic Acetate Oxidation in a Coculture with Desulfonatronum cooperativum . Microbiology 74, 695–703 (2005). https://doi.org/10.1007/s11021-005-0126-4

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  • DOI: https://doi.org/10.1007/s11021-005-0126-4

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