The electrochemical proton potential generated by the sulphur respiration of Wolinella succinogenes |
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Authors: | Christiane Wloczyk Achim Kröger Thomas Göbel Gabriele Holdt Ralf Steudel |
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Affiliation: | (1) Institut für Mikrobiologie der J. W. Goethe-Universität Frankfurt am Main, Theodor-Stern-Kai 7, Haus 75A, D-6000 Frankfurt am Main, Germany;(2) Institut für Anorganische und Analytische Chemie, Technische Universität Berlin, D-1000 Berlin |
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Abstract: | Wolinella succinogenes grown on formate and elemental sulphur was found to use the polysulphide derivatives 2,2-tetrathiobispropionate (R2S4) or pentathionate (S5O6=) as acceptors for formate oxidation. The specific activities of formate oxidation with these acceptors were similar to those with elemental sulphur. The main reaction products of R2S4 reduction were 2,2-dithiobispropionate (R2S2) and sulphide. Pentathionate was converted to thiosulphate and some elemental sulphur. The electrochemical proton potential across the cytoplasmic membrane of the bacterium was measured in the steady state of electron transport from formate to R2S4. The electrical proportion () of the determined through the distribution of labeled tetraphenylphosphonium cation was obtained as 0.17 Volt. The was zero, when a protonophore was present. The pH-difference across the membrane was negligible. Thus the generated by sulphur respiration is close to that measured earlier with fumarate as the terminal acceptor of electron transport.Abbreviations DMO 5,5-dimethyloxazolidine-2,4-dione - R2Sn (n=2–5) 2,2-polythiobispropionate - TTFB 4,5,6,7-tetrachloro-2-trifluoromethylbenzimidazol - TPP tetraphenylphosphonium cation |
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Keywords: | Sulphur respiration Electrochemical proton potential Wolinella succinogenes |
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