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J Bacteriol. 1967 May; 93(5): 1565-1570
Copyright © 1967 American Society for Microbiology. All Rights Reserved.

D-Arabinose Countertransport in Bakers' Yeast

Department of Microbiology, New Jersey College of Medicine and Dentistry, Jersey City, New Jersey 07304

ABSTRACT

The initial rate of the glucose-induced countertransport of D-arabinose was measured at several concentrations of extracellular glucose. These data permit the calculation of the intracellular concentration of free glucose, and, if the rate of glucose metabolism is known, the maximal rate of glucose transport can be estimated. Since the maximal transport rate remained essentially constant when the extracellular glucose concentration was increased from 2 to 100 mM, the results are consistent with the hypothesis that, during glucose metabolism, glucose is transported across the yeast cell membrane by a symmetrical carrier system which functions independently of metabolism.