PMID: 39601Aug 23, 1979

The effect of intracellular pH on the rate of hexose uptake in Chlorella

Biochimica Et Biophysica Acta
E KomorW Tanner

Abstract

The rate of hexose uptake by Chlorella is reduced by uncouplers such as carbonyl cyanide p-trifluoromethoxyphenyl hydrazone or dinitrophenol even before concentration equilibrium is reached. The addition of uncouplers changes the membrane potential and the intracellular pH. The membrane potential does not influence the initial velocity of net sugar uptake, whereas manipulation of the cell pH by means of dimethyloxazolidinedione or by butyric acid uncovered a dramatic influence of cell pH on the rate of hexose uptake: at pH values of 7.5--6.8 maximal rate of uptake is observed but at more acid pH a strong inhibition takes place with virtually total blockage of uptake at pH 6.1. The decrease of cell pH to 6.1 in the presence of carbonyl cyanide p-trifluoromethoxyphenyl hydrazone could therefore account for the decrease in hexose transport rate. It was shown that the intracellular pH as such determines the rate of uptake and not the pH difference between inside and outside; the transport rate did not correlate with delta pH.

References

Feb 1, 1985·Journal of Bioenergetics and Biomembranes·E Marrè, A Ballarin-Denti
Jan 1, 1984·Planta·C I Ullrich-EberiusA J van Bel
Apr 1, 1981·Plant Physiology·F T Lichtner, R M Spanswick
Sep 1, 1981·Plant Physiology·F T Lichtner, R M Spanswick
Aug 1, 1989·Plant Physiology·A Sanz, C I Ullrich
Oct 26, 2010·Water Research·Octavio Perez-GarciaYoav Bashan
May 5, 1983·Biochimica Et Biophysica Acta·E P Bakker, W E Mangerich
Nov 21, 1984·Biochimica Et Biophysica Acta·A Ballarin-DentiC L Slayman
Apr 5, 2000·Biochimica Et Biophysica Acta·S DelrotL Maurousset
May 27, 1980·Biochimica Et Biophysica Acta·I C West

Citations

Apr 20, 1978·Biochimica Et Biophysica Acta·D M Regen, H L Tarpley
Jun 20, 1972·Biochimica Et Biophysica Acta·E KomorW Tanner
Dec 1, 1971·The Journal of Membrane Biology·A Kepes

Related Concepts

Dinitrophenols
Hexose Transport
Butyric Acid
Uncoupling Agents
Hexoses
Protoplasm
Resting Potentials
Uptake
Deoxy Sugars
Chlorella <Chlorellales>

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