The PEP: Fructose Phosphotransferase System in Salmonella Typhimurium: FPr Combines Enzyme IIIFru and Pseudo-HPr Activities

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1989 Apr 1

PMID 2546043

Citations 35

Authors

R H Geerse

F Izzo

P W Postma

Affiliations

Soon will be listed here.

Abstract

We have cloned the fru operon of Salmonella typhimurium, coding for the enzymes of the phosphoenolpyruvate: fructose phosphotransferase system (Fructose PTS). The fruFKA operon consists of three genes: fruF coding for FPr, fruK for fructose 1-phosphate kinase and fruA for Enzyme IIFru. Insertions of Tn5 in the different genes were isolated and the activities of the gene products were measured. Expression of the plasmid-encoded fru operon in the maxicell system resulted in the synthesis of three proteins with molecular weights of 47 kDa (fruA), 39 kDa (fruF) and 32 kDa (fruK). We have sequenced the fruF gene and the regulatory region of the fru operon. In contrast to previously published results, we have found that the fruF gene codes for a 39 kDa protein, FPr, that combines Enzyme IIIFru and pseudo-HPr activities. The N-terminal part of FPr is homologous to the cytoplasmic domain of the Escherichia coli Enzyme IIMtl, as well as several Enzymes IIIMtl from gram-positive bacteria. The C-terminal domain shows homology to HPr of E. coli and several gram-positive organisms. The fru operon is regulated by a repressor, FruR. We have constructed an operon fusion between fru and the galK gene and shown that regulation of the fru operon by FruR takes place at the level of transcription.

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