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. 1975 Nov;124(2):613–622. doi: 10.1128/jb.124.2.613-622.1975

Dicarboxylic acid transport in membrane vesicles from Bacillus subtilis.

A Bisschop, H Doddema, W N Konings
PMCID: PMC235947  PMID: 171251

Abstract

Membrane vesicles isolated from Bacillus subtilis W23 catalyze active transport of the C4 dicarboxylic acids L-malate, fumarate, and succinate under aerobic conditions in the presence of the electron donor reduced beta-nicotinamide adenine dinucleotide or the non-physiological electron donor system ascorbate-phenazine methosulfate. The dicarboxylic acids are accumulated in unmodified form. Inhibitors of the respiratory chain, sulfhydryl reagents, and uncoupling agents inhibit the accumulation of the dicarboxylic acids. The affinity constants for transport of L-malate, fumarate, and succinate are 13.5, 7.5, and 4.3 muM, respectively; these values are severalfold lower than those reported previously for whole cells. Active transport of these dicarboxylic acids occurs via one highly specific transport system as is indicated by the following observations. (i) Each dicarboxylic acid inhibits the transport of the other two dicarboxylic acids competitively. (ii) The affinity constants determined for the inhibitory action are very similar to those determined for the transport process. (iii) Each dicarboxylic acid exchanges rapidly with a previously accumulated dicarboxylic acid. (iv) Other metabolically and structurally related compounds do not inhibit transport of these dicarboxylic acids significantly, except for L-aspartate and L-glutamate. However, transport of these dicarboxylic amino acids is mediated by independent system because membrane vesicles from B. subtilis 60346, lacking functional dicarboxylic amino acid transport activity, accumulate the C4 dicarboxylic acids at even higher rates than vesicles from B. subtilis W 23. (v) A constant ratio exists between the initial rates of transport of L-malate, fumarate, and succinate in all membrane vesicle preparations isolated from cells grown on various media. This high-affinity dicarboxylic acid transport system seems to be present constitutively in B. subtilis W23.

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Selected References

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