Abstract
Rhodobacter capsulatus grew by using either L- or D-malate as carbon sources under light/anaerobic conditions. The cellular yields were the same with D- or L-malate. Both L-malate dehydrogenase and L-malic enzyme activities were detected in cell-free extracts from cells grown in both isomers. By contrast, a racemase activity converting D-malate into L-malate was induced only when D-malate was present in the culture medium. This racemase activity was Mn2+-dependent and was measured by coupling it either to the malate dehydrogenase or to the fumarase activities. The racemase activity was partially purified by anion-exchange chromatography.
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Received: 30 November 2000/Accepted: 10 January 2001
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Martínez-Luque, M., Castillo, F. & Blasco, R. Assimilation of D-Malate by Rhodobacter capsulatus E1F1. Curr Microbiol 43, 154–157 (2001). https://doi.org/10.1007/s002840010279
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DOI: https://doi.org/10.1007/s002840010279