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J Bacteriol. 2000 Oct;182(19):5624-7.

Purification and characterization of glpX-encoded fructose 1, 6-bisphosphatase, a new enzyme of the glycerol 3-phosphate regulon of Escherichia coli.

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  • 1Department of Biochemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.


In Escherichia coli, gene products of the glp regulon mediate utilization of glycerol and sn-glycerol 3-phosphate. The glpFKX operon encodes glycerol diffusion facilitator, glycerol kinase, and as shown here, a fructose 1,6-bisphosphatase that is distinct from the previously described fbp-encoded enzyme. The purified enzyme was dimeric, dependent on Mn(2+) for activity, and exhibited an apparent K(m) of 35 microM for fructose 1,6-bisphosphate. The enzyme was inhibited by ADP and phosphate and activated by phosphoenolpyruvate.

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