Summary: In sugar-grown cells of cowpea strain NGR234 activities for enzymes of the Entner-Doudoroff and pentose phosphate pathways were present while the virtual absence of phospho-fructokinase and fructose-bisphosphate aldolase indicated that the Embden–Meyerhof–Parnas pathway was unlikely to be significant. Invertase, fructokinase, glucose-6-phosphate dehydrogenase and the Entner–Doudoroff enzymes were present at only low activities in succinate grown cells, but were induced in sugar-grown cells. Isolated snakebean bacteroids contained very low activities of these four enzymes. Although C-dicarboxylic acids exerted some repressive effect on induction of these enzymes, there was substantial enzyme activity induced in cells grown on sucrose plus a C dicarboxylic acid. The data suggest that the peribacteroid membrane may be relatively impermeable to sugars and so dictate the carbon source(s) available to the bacteroids.


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