Selenomonas acidaminovorans sp. nov., a versatile thermophilic proton-reducing anaerobe able to grow by decarboxylation of succinate to propionate |
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| Authors: | Cheng Guangsheng Caroline M Plugge Wim Roelofsen Frans P Houwen Alfons J M Stams |
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| Institution: | (1) Department of Microbiology, Wageningen Agricultural University, Hess. v. Suchtelenweg 4, 6703 CT Wageningen, The Netherlands;(2) Present address: Institute of Microbiology, Academic Sinica, 100080 Beijing, P.R. China;(3) Present address: Department of Microbiology, Swedish University of Agricultural Sciences, P. O. Box 7025, S-750 07 Uppsala, Sweden |
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| Abstract: | A moderately thermophilic anaerobic bacterium (strain Su883), which decarboxylated succinate to propionate, was isolated from granular methanogenic sludge. The bacterium appeared to ferment a number of amino acids including glutamate, histidine, arginine, ornithine, citrulline, and threonine to propionate, acetate and hydrogen. Propionate was formed via the oxidative decarboxylation of  -ketoglutarate to succinyl-CoA. In addition, the strain degraded glucose, fructose, glycerol, pyruvate, serine, alanine, citrate and malate to acetate, carbon dioxide and hydrogen, and branched-chain amino acids to branched-chain fatty acids. With all single substrates solely hydrogen was formed as reduced fermentation product. Mixed cultures of strain Su883 and Methanobacterium thermoautotrophicum  H showed a more rapid conversion of substrates and with some substrates a shift from acetate to propionate formation.Strain Su883 is a motile, gram-negative, non-sporeforming, slightly curved rod with a DNA base ratio of 56.5 mol% guanine-plus-cytosine. Selenomonas acidaminovorans Su883 is proposed as type strain for the new species within the genus Selenomonas. |
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| Keywords: | Fermentation of amino acids Interspecies hydrogen transfer Propionic acid fermentation Selenomonas acidaminovorans Succinate decarboxylation Syntrophic degradation |
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