Fermentation of Acetylene by an Obligate Anaerobe, Pelobacter Acetylenicus Sp
Archives of Arch Microbiol (1985) 142: 295- 301 Microbiology Springer-Verlag 1985 Fermentation of acetylene by an obligate anaerobe, Pelobacter acetylenicus sp. nov. * Bernhard Schink Fakult/it ffir Biologie, Universit/it Konstanz, Postfach 5560, D-7750 Konstanz, Federal Republic of Germany Abstract. Four strains of strictly anaerobic Gram-negative tion reactions (Schink 1985a). No significant anaerobic rod-shaped non-sporeforming bacteria were enriched and degradation could be observed with ethylene (ethene), the isolated from marine and freshwater sediments with acety- most simple unsaturated hydrocarbon (Schink 1985 a, b). lene (ethine) as sole source of carbon and energy. Acetylene, It was reported recently that also acetylene can be metab- acetoin, ethanolamine, choline, 1,2-propanediol, and glyc- olized in the absence of molecular oxygen (Watanabe and erol were the only substrates utilized for growth, the latter de Guzman 1980). Enrichment cultures with acetylene as two only in the presence of small amounts of acetate. Sub- sole carbon source were obtained in mineral media with strates were fermented by disproportionation to acetate and sulfate as electron acceptor, and acetate could be identified ethanol or the respective higher acids and alcohols. No as an intermediary metabolite (Culbertson et al. 1981). How- cytochromes were detectable; the guanine plus cytosine ever, these enrichment cultures were difficult to maintain, content of the DNA was 57.1 _+ 0.2 tool%. Alcohol dehy- and the acetylene-degrading bacteria could not be identified drogenase, aldehyde dehydrogenase, phosphate acetyl- (C. W. Culbertson and R. S. Oremland, Abstr. 3rd Int. transferase, and acetate kinase were found in high activities Syrup.
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