Transport of l(-)malic acid and other dicarboxylic acids in the yeast Candida sphaerica View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1989-10

AUTHORS

Manuela Côrte-Real, C. Leão, N. van Uden

ABSTRACT

dl-Malic acid grown cells of Candida sphaerica (anamorph of Kluyveromyces marxianus) formed a saturable transport system that mediated accumulative transport of l(-)malic acid with the following kinetic parameters at pH 5.0: Vmax, 0.44 nmol l(-)malate·s-1 per milligram dry weight; Km,0.1 mMl(-)malate. Initial uptake of the acid was accompanied by disappearance of extracellular protons, the rates of which followed Michaelis-Menten kinetics as a function of the acid concentration. Variation with extracellular pH of the Kmvalues, calculated either as the concentrations of anions or of undissociated acid, pointed to anions as the transported form. Furthermore, accumulated free acid suffered rapid efflux after the addition of the protonophore carbonylcyanide-M-chlorophenyl-hydrazone (CCCP). These results suggested that the transport system was a dicarboxylate-proton symporter. The system was inducible and was subject to glucose repression. Succinic, fumaric, α-ketoglutaric, oxaloacetic and d-malic acid, but not maleic, malonic, oxalic nor l(+)-tartaric acid, apparently used the same transport system since they acted as competitive inhibitors of l(-)malic acid transport and induced proton movements that followed Michaelis-Menten kinetics. Experiments with glucose-repressed cells showed that undissociated dicarboxylic acid (measured with labelled succinic acid) entered the cells slowly by simple diffusion. The permeability of the cells for undissociated acid increased exponentially with pH, the diffusion constant increasing 100-fold between pH 3.5 and 6.0. More... »

PAGES

551-555

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00270793

DOI

http://dx.doi.org/10.1007/bf00270793

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1033864913


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