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  • 1
    Electronic Resource
    Electronic Resource
    Studies on dissimilatory sulfate-reducing bacteria that decompose fatty acids (1981)
    Springer
    Archives of microbiology 129 (1981), S. 395-400 
    Details
    ISSN: 1432-072X
    Keywords: Anaerobic acetate oxidation ; Saline environments ; Sulfate reduction ; Sulfite ; Thiosulfate ; Growth yields ; Cytochromes ; Species description ; Desulfobacter postgatei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three strains (2ac9, 3ac10 and 4ac11) of oval to rodshaped, Gram negative, nonsporing sulfate-reducing bacteria were isolated from brackish water and marine mud samples with acetate as sole electron donor. All three strains grew in simple defined media supplemented with biotin and 4-aminobenzoic acid as growth factors. Acetate was the only electron donor utilized by strain 2ac9, while the other two strains used in addition ethanol and/or lactate. Sulfate served as electron acceptor and was reduced to H2S. Complete oxidation of acetate to CO2 was shown by stoichiometric measurements with strain 2ac9 in batch cultures using sulfate, sulfite or thiosulfate as electron acceptors. With sulfate an average growth yield of 4.8 g cell dry weight was obtained per mol of acetate oxidized; with sulfite or thiosulfate the growth yield on acetate was about twice as high. None of the strains contained desulfoviridin. In strain 2ac9 cytochromes of the b- and c-type were detected. Strain 2ac9 is described as type strain of the new species and genus, Desulfobacter postgatei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406470
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  • 2
    Electronic Resource
    Electronic Resource
    Anaerobic acetate oxidation to CO2 by Desulfobacter postgatei (1983)
    Springer
    Archives of microbiology 136 (1983), S. 222-229 
    Details
    ISSN: 1432-072X
    Keywords: Desulfobacter postgatei ; Citric acid cycle ; Anaplerotic reactions ; Citrate (si)-synthase ; 2-Oxoglutarate:ferredoxin oxidoreductase ; Succinate dehydrogenase ; Succinyl-CoA:acetate CoA transferase ; Acetyl-CoA synthetase ; Pyruvate synthase ; Phosphoenolpyruvate synthetase ; Phosphoenolpyruvate carboxylase ; Menaquinone ; Ferredoxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The strict anaerobe Desulfobacter postgatei oxidizes acetate to CO2 with sulfate as electron acceptor. During growth at 28°C with a doubling time of 16 h the oxidation and assimilation rate of acetate were 280 nmol and 20 nmol per min and mg protein, respectively. In cell extracts all the enzymes of the citric acid cycle were found (numbers in brackets=specific activities in nmol per min and mg protein at 28°C): Citrate (si)-synthase (250); aconitase (200); NADP-dependent isocitrate dehydrogenase (8500); 2-oxoglutarate: ferredoxin oxidoreductase (300); succinyl-CoA: acetate CoA transferase (160); membrane bound succinate dehydrogenase (3500); and membrane bound malate dehydrogenase with 2,3-dimethyl-1,4-naphthoquinone as artificial electron acceptor (54). The following enzymes catalyzing the synthesis of oxaloacetate from acetate and CO2 were also present: Acetyl-CoA synthetase (10); ferredoxin dependent pyruvate synthase (30); phosphoenolpyruvate synthetase (10); and phosphoenolpyruvate carboxylase (24). The key enzymes of the glyoxylate cycle were not detected. The order of magnitude of the observed enzyme activities was sufficient to account for an oxidation of acetate via the citric acid cycle and for a synthesis of oxaloacetate from acetate and CO2 as anaplerotic reaction. The membranes of D. postgatei contained menaquinone (0.35 nmol per mg cell dry weight) rather than ubiquinone or demethylmenaquinone. The cytoplasmic fraction contained ferredoxin (0.09 nmol per mg cell dry weight).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409849
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