Characterization of two novel saccharolytic, anaerobic thermophiles, Thermoanaerobacterium polysaccharolyticum sp. nov. and Thermoanaerobacterium zeae sp. nov., and emendation of the genus Thermoanaerobacterium

International Journal of Systematic and Evolutionary Microbiology
Isaac K O CannRoderick I Mackie

Abstract

Two anaerobic, thermophilic, Gram-positive, non-spore forming bacteria with an array of polysaccharide-degrading enzymes were isolated from the leachate of a waste pile from a canning factory in Hoopeston, East Central Illinois, USA. The results of 16S rDNA sequence homology indicated that their closest relatives belong to the saccharolytic, thermophilic and anaerobic genera of Thermoanaerobacterium and Thermoanaerobacter. Although, the evolutionary distances between these bacteria and their closest relatives are greater than 11%, there is no defining phenotypic characteristic for the creation of a new genus. It is proposed that these bacteria should be placed in the genus Thermoanaerobacterium, which requires emendment of the genus description with regard to the reduction of thiosulfate to sulfur, because neither isolate is capable of this reduction. Thermoanaerobacterium polysaccharolyticum reduces thiosulfate to sulfide, whereas Thermoanaerobacterium zeae is unable to reduce thiosulfate. The cells of both isolates are rod-shaped and exist as single cells or sometimes in pairs. Cells are motile by means of flagella. Growth occurs between 45 and 72 degrees C, with optimum temperature of 65-68 degrees C at pH 6.8. The pH range ...Continue Reading

Citations

Apr 2, 2008·Annals of the New York Academy of Sciences·Isaac D Wagner, Juergen Wiegel
May 27, 2008·Biotechnology and Bioengineering·Perttu E P KoskinenJaakko A Puhakka
Jun 23, 2009·International Journal of Systematic and Evolutionary Microbiology·David M NelsonRoderick I Mackie
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