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Appl. Environ. Microbiol., 02 1997, 543-546, Vol 63, No. 2
Copyright © 1997, American Society for Microbiology

Listeria monocytogenes Scott A transports glucose by high-affinity and low-affinity glucose transport systems

C Parker and RW Hutkins
Department of Food Science and Technology, University of Nebraska- Lincoln 68583-0919, USA.

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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