Energy conservation in the decarboxylation of dicarboxylic acids by fermenting bacteria
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Decarboxylation of dicarboxylic acids (oxalate, malonate, succinate, glutarate, and malate) can serve as the sole energy source for the growth of fermenting bacteria. Since the free energy change of a decarboxylation reaction is small (around 20 kJ per mol) and equivalent to only approximately one-third of the energy required for ATP synthesis from ADP and phosphate under physiological conditions, the decarboxylation energy cannot be conserved by substrate-level phosphorylation. It is either converted (in malonate, succinate, and glutarate fermentation) by membrane-bound primary decarboxylase sodium ion pumps into an electrochemical gradient of sodium ions across the membrane; or, alternatively, an electrochemical proton gradient can be established by the combined action of a soluble decarboxylase with a dicarboxylate/monocarboxylate antiporter (in oxalate and malate fermentation). The thus generated electrochemical Na+ or H+ gradients are then exploited for ATP synthesis by Na+- or H+-coupled F1F0 ATP synthases. This new type of energy conservation has been termed decarboxylation phosphorylation and is responsible entirely for ATP synthesis in several anaerobic bacteria.
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DIMROTH, Peter, Bernhard SCHINK, 1998. Energy conservation in the decarboxylation of dicarboxylic acids by fermenting bacteria. In: Archives of microbiology. 1998, 170(2), pp. 69-77. ISSN 0302-8933. eISSN 1432-072X. Available under: doi: 10.1007/s002030050616BibTex
@article{Dimroth1998Energ-8202, year={1998}, doi={10.1007/s002030050616}, title={Energy conservation in the decarboxylation of dicarboxylic acids by fermenting bacteria}, number={2}, volume={170}, issn={0302-8933}, journal={Archives of microbiology}, pages={69--77}, author={Dimroth, Peter and Schink, Bernhard} }
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