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. 1990 Oct;172(10):5714–5723. doi: 10.1128/jb.172.10.5714-5723.1990

Regulation of fructose metabolism and polymer synthesis by Fusobacterium nucleatum ATCC 10953.

S A Robrish 1, J Thompson 1
PMCID: PMC526887  PMID: 2211506

Abstract

Energy for the anaerobic growth of Fusobacterium nucleatum ATCC 10953 can be derived from the fermentation of sugar (fructose) or amino acid (glutamate). During growth on fructose, the cells formed large intracellular granules which after extraction yielded glucose by either acid or enzymatic hydrolysis. The endogenous polymer was subsequently metabolized, and after overnight incubation of the cells in buffer, the glucan granules were no longer detectable by electron microscopy. Anaerobically, washed cells grown previously on fructose fermented this sugar to a mixture of lactic, acetic, and butyric acids, and little intracellular glucan was formed. Aerobically, the cells slowly metabolized fructose to acetate. Provision of glutamic acid as an additional energy (ATP) source elicited rapid synthesis of polymer by glycolyzing cells. Intracellular granules were not present in glutamate-grown cells, and under anaerobic conditions, the resting cells failed to metabolize [14C] fructose. However, the addition of glutamic acid to the suspension resulted in the rapid accumulation of sugar by the cells. Approximately 15% of the 14C-labeled material was extractable with boiling water, and by 31P nuclear magnetic resonance spectroscopy, this phosphorylated derivative was identified as [14C]fructose-1-phosphate. The nonextractable material represented [14C]glucan polymer. Fructose-1-phosphate kinase activity in fructose-grown cells was fivefold greater than that in glutamate-grown cells. We suggest that the activity of fructose-1-phosphate kinase and the availability of ATP regulate the flow of fructose into either the glycolytic or polymer-synthesizing pathway in F. nucleatum.

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