Abstract
Effects of starvation and glucose preincubation on membrane potential, ATPase-mediated acidification and glutamic acid transport were studied in yeast speciesSaccharomyces cerevisiae, Schizosaccharomyces pombe, Dipodascus magnusii, Lodderomyces elongisporus andRhodotorula gracilis. Themembrane potential was highest after preincubation with glucose in all species butL. elongisporus andR. gracilis. In all cases the membranes were depolarized in the presence of 20 mmol/L KCl and hyperpolarized with 50 μmol/L diethylstilbestrol (DES). Theextracellular acidification caused by addition of glucose was highest after preincubation with glucose in all cases except inR. gracilis where there was none. In all cases except inR. gracilis addition of KCl caused a marked increase in the acidification rate. Addition of DES with glucose caused a large decrease in rate inS. cerevisiae but had much less effect on the other species.Transport of glutamic acid was clearly increased after pretreatment with glucose inS. cerevisiae, S. pombe andD. magnusii (mainly due to enhanced synthesis of the carrier) but actually decreased inR. gracilis andL. elongisporus. Addition of DES had an inhibitory effect in all species but much more pronounced inS. cerevisiae andS. pombe than in others. In general, both the acidification and the transport of glutamate were enhanced after preincubation with glucose but much more so in the semianaerobic species, such asS. cerevisiae, than in the strict aerobes (R. gracilis) where the effect was occasionally negative. There was no relationship between the ATPase-mediated acidification and the membrane potential.
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Kotyk, A., Georghiou, G. Effects of the physiological state of five yeast species on H+-ATPase-related processes. Folia Microbiol 38, 467–472 (1993). https://doi.org/10.1007/BF02814397
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DOI: https://doi.org/10.1007/BF02814397