Physiology and Genetics of C4-Dicarboxylate Transport in Rhodobacter capsulatus
Of those carbon sources traditionally used in studies on purple non-sulphur bacteria, the C4-dicarboxylic acids malate and succinate have long been known to be particularly effective in promoting fast growth rates and producing high cell yields under both photo- and chemoheterotrophic growth conditions (Stahl and Sojka, 1973). In Rhodobacter capsulatus, the iron-sulphur centre associated with succinate dehydrogenase is in redox equilibrium with the quinone pool (Zanonni and Ingledew, 1983), so that in addition to providing cell carbon, succinate can also act as a direct electron donor. Alternatively, under different circumstances, the reduction of fumarate to succinate may act as a redox poising mechanism for the removal of excess reducing equivalents (McEwan et al., 1985).
KeywordsRhodobacter Capsulatus Malate Transport Minus Malate Dicarboxylate Transport Malate Uptake
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