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Evidence for Vectorial Phosphorylation of D-Fructose by Intact Cells of Aerobacter aerogenes

^a Department of Biochemistry, Michigan State University, East Lansing, Michigan 48823

ABSTRACT

Extracellular D-fructose was metabolized preferentially over intracellular D-fructose in growing cells of a D-fructokinaseless mutant of Aerobacter aerogenes. This finding is interpreted to indicate that phosphorylation of D-fructose by the membrane-bound phosphoenolpyruvate: D-fructose 1-phosphotransferase system in intact cells is coupled to unidirectional transport.

¹ Present address: Department of Microbiology, New York University School of Medicine, New York, N.Y. 10016.

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