Food Science and Technology Department

 

Department of Food Science and Technology: Faculty Publications

Document Type

Article

Date of this Version

February 1997

Comments

Published in APPLIED AND ENVIRONMENTAL MICROBIOLOGY, Feb. 1997, p. 543–546 Vol. 63, No. 2. Copyright 1997, American Society for Microbiology. Used by permission.

Abstract

Listeria monocytogenes transported glucose by a high-affinity phosphoenolpyruvate-dependent phosphotransferase system and a low-affinity proton motive force-mediated system. The low-affinity system (Km = 2.9 mM) was inhibited by 2-deoxyglucose and 6-deoxyglucose, whereas the high-affinity system (Km= 0.11 mM) was inhibited by 2-deoxyglucose and mannose but not 6-deoxyglucose. Cells and vesicles artificially energized with valinomycin transported glucose or 2-deoxyglucose at rates greater than those of de-energized cells, indicating that a membrane potential could drive uptake by the low-affinity system.

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