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Multiple glucose transport systems were distinguished in Rhizobium leguminosarum. We found nonlinear Lineweaver-Burk plots for the uptake of glucose, 2-deoxy-D-glucose, and alpha-methyl-D-glucoside, and this implied the existence of at least two uptake mechanisms. Different patterns of inhibition of 2-deoxy-D-glucose uptake and alpha-methyl-D-glucoside uptake at 0.1 mM by various carbohydrates revealed differences in the stereospecificities of the transport systems. Osmotic shock treatment abolished transport activities, and two independent glucose-binding activities were detected in the supernatants. Induction of glucose transport was repressed strongly by L-malate, even in the presence of excess D-glucose. Rhizobium bacteroids showed no significant glucose uptake activity at different oxygen concentrations. These results suggested that glucose transport is repressed by dicarboxylic acids during R. leguminosarum symbiosis.

Mechanism of regulation of glucose transport in Rhizobium leguminosarum