Autotrophic CO2 fixation in Acetobacterium woodii |
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Authors: | Gerolf Eden Georg Fuchs |
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Affiliation: | (1) Fachbereich Biologie-Mikrobiologie, Philipps-Universität Marburg, Lahnberge, D-3550 Marburg, Federal Republic of Germany;(2) Present address: Angewandte Mikrobiologie, Universität Ulm, Oberer Eselsberg M23, D-7900 Ulm, Federal Republic of Germany |
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Abstract: | Earlier labeling experiments have shown that autotrophically grown Acetobacterium woodii assimilates cell carbon via direct acetyl CoA formation from 2 CO2, rather than via the Calvin cycle. Cell extracts contained the enzymes required for biosynthesis starting from acetyl CoA and CO2. Notably, pyruvate synthase, pyruvate phosphate dikinase, and phosphoenolpyruvate carboxytransphosphorylase were present in sufficiently high activities. Ribulose-1,5-bisphosphate carboxylase activity could not be detected. The observed enzyme pattern was consistent with the postulated biosynthetic pathway as deduced from 14C-labeling experiments. |
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Keywords: | Acetobacterium woodii Autotrophic CO2 fixation Pyruvate synthase Pyruvate phosphate dikinase Phosphoenolpyruvate carboxytransphosphorylase |
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