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Tri carboxylic acid transport systems in proteus mirabilis


, : Tri carboxylic acid transport systems in proteus mirabilis. Journal of General and Applied Microbiology 24(5): 279-286

Tricarboxylic acid transport systems in P. mirabilis IFO 3849, which utilized citric, isocitric and cis-aconitic acids, were characterized. The results show that P. mirabilis possesses 3 inducible transport systems for the tricarboxylic acids. The 1st system is induced by citrate, isocitrate, or cis-aconitate and transports citric and isocitric acids. The affinity of isocitric acid for this system is lower than that of citric acid. The 2nd system, induced by the same acids as in the 1st system, transports cis-aconitic acid, requires Mg2+, and is stable at pH 8.6 but unstable at pH 7. The 3rd system is induced by citrate and carries citric acid.

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