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Glucose uptake by whole-cell suspensions of the obligate anaerobeBacteroides thetaiotaomicron was two- to fourfold higher under aerobic conditions than during incubation under atmospheres of N2 or H2 gas. The O2 -stimulated uptake activity was lost rapidly (&gt;70% in 5 h) when cell suspensions were incubated aerobically, but this loss was prevented by the addition of crude catalase. Catalase had no apparent effect on cell viability during these incubations. Glucose uptake activity was strongly inhibited by a 10-fold excess of mannose or galactose but not by methyl-α-d -glucoside, fructose, or lactose. Both glucose and mannose were rapidly incorporated into polyglucose after uptake. The O2 -stimulated glucose uptake was not inhibited by cyanide, azide, 2,4-dinitrophenol, or 2-N -heptyl-4-hydroxyquinoline-N -oxide. However,p -chloromercuribenzoate, menadione, and sodium fluoride inhibited uptake by 88, 67, and 55%, respectively. All attempts to detect phosphoenolpyruvate-phosphotransferase activity for glucose, methyl-α-d -glucoside, and 2-deoxyglucose were negative. The bacteria contained hexokinase activity and a complete glycolytic Embden-Meyerhof pathway.

Uptake and Incorporation of Glucose and Mannose by Whole Cells of Bacteroides thetaiotaomicron