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Journal of Bacteriology, August 1999, p. 4673-4675, Vol. 181, No. 15
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Growth and Glucose Repression Are Controlled by Glucose Transport in Saccharomyces cerevisiae Cells Containing Only One Glucose Transporter

Ling Ye, Arthur L. Kruckeberg, Jan A. Berden, and Karel van Dam*

E. C. Slater Institute/BioCentrum Amsterdam, The University of Amsterdam, 1018 TV Amsterdam, The Netherlands

Received 16 February 1999/Accepted 20 May 1999

A set of Saccharomyces cerevisiae strains with variable expression of only the high-affinity Hxt7 glucose transporter was constructed by partial deletion of the HXT7 promoter in vitro and integration of the gene at various copy numbers into the genome of an hxt1-7 gal2 deletion strain. The glucose transport capacity increased in strains with higher levels of HXT7 expression. The consequences for various physiological properties of varying the glucose transport capacity were examined. The control coefficient of glucose transport with respect to growth rate was 0.54. At high extracellular glucose concentrations, both invertase activity and the rate of oxidative glucose metabolism increased manyfold with decreasing glucose transport capacity, which is indicative of release from glucose repression. These results suggest that the intracellular glucose concentration produces the signal for glucose repression.

* Corresponding author. Mailing address: E. C. Slater Institute/BioCentrum Amsterdam, The University of Amsterdam, Plantage Muidergracht 12, 1018 TV Amsterdam, The Netherlands. Phone: 31 20 525 5125. Fax: 31 20 525 5124. E-mail: k.van.dam{at}chem.uva.nl.

Journal of Bacteriology, August 1999, p. 4673-4675, Vol. 181, No. 15
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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