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. 1991 Sep;57(9):2534–2539. doi: 10.1128/aem.57.9.2534-2539.1991

Properties of the glucose phosphotransferase system of Clostridium acetobutylicum NCIB 8052.

W J Mitchell 1, J E Shaw 1, L Andrews 1
PMCID: PMC183615  PMID: 1768126

Abstract

The glucose phosphotransferase system (PTS) of Clostridium acetobutylicum was studied by using cell extracts. The system exhibited a Km for glucose of 34 microM, and glucose phosphorylation was inhibited competitively by mannose and 2-deoxyglucose. The analogs 3-O-methylglucoside and methyl alpha-glucoside did not inhibit glucose phosphorylation significantly. Activity showed no dependence on Mg2+ ions or on pH in the range 6.0 to 8.0. The PTS comprised both soluble and membrane-bound proteins, which interacted functionally with the PTSs of Clostridium pasteurianum, Bacillus subtilis, and Escherichia coli. In addition to a membrane-bound enzyme IIGlc, sugar phosphorylation assays in heterologous systems incorporating extracts of pts mutants of other organisms provided evidence for enzyme I, HPr, and IIIGlc components. The HPr was found in the soluble fraction of C. acetobutylicum extracts, whereas enzyme I, and probably also IIIGlc, was present in both the soluble and membrane fractions, suggesting a membrane location in the intact cell.

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Selected References

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