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. 1991 Jun;173(12):3709–3715. doi: 10.1128/jb.173.12.3709-3715.1991

Mannitol-specific phosphoenolpyruvate-dependent phosphotransferase system of Enterococcus faecalis: molecular cloning and nucleotide sequences of the enzyme IIIMtl gene and the mannitol-1-phosphate dehydrogenase gene, expression in Escherichia coli, and comparison of the gene products with similar enzymes.

R Fischer 1, R P von Strandmann 1, W Hengstenberg 1
PMCID: PMC207999  PMID: 1904856

Abstract

Enzyme IIIMtl is part of the mannitol phosphotransferase system of Enterococcus faecalis. It is phosphorylated in a reaction sequence requiring enzyme I and heat-stable phosphocarrier protein (HPr). The phospho group is transferred from enzyme IIIMtl to enzyme IIMtl, which then catalyzes the uptake and concomitant phosphorylation of mannitol. The internalized mannitol-1-phosphate is oxidized to fructose-6-phosphate by mannitol-1-phosphate dehydrogenase. In this report we describe the cloning of the mtlF and mtlD genes, encoding enzyme IIIMtl and mannitol-1-phosphate dehydrogenase of E. faecalis, by a complementation system designed for cloning of gram-positive phosphotransferase system genes. The complete nucleotide sequences of mtlF, mtlD, and flanking regions were determined. From the gene sequences, the primary translation products are deduced to consist of 145 amino acids (enzyme IIIMtl) and 374 amino acids (mannitol-1-phosphate dehydrogenase). Amino acid sequence comparison confirmed a 41% similarity of E. faecalis enzyme IIIMtl to the hydrophilic enzyme IIIMtl-like portion of enzyme IIMtl of Escherichia coli and 45% similarity to enzyme IIIMtl of Staphylococcus carnosus. The putative N-terminal NAD+ binding domain of mannitol-1-phosphate dehydrogenase of E. faecalis shows a high degree of similarity with the N terminus of E. coli mannitol-1-phosphate dehydrogenase (T. Davis, M. Yamada, M. Elgort, and M. H. Saier, Jr., Mol. Microbiol. 2:405-412, 1988) and the N-terminal part of the translation product of S. carnosus mtlD, which was also determined in this study. There is 40% similarity between the dehydrogenases of E. faecalis and E. coli over the whole length of the enzymes. The organization of mannitol-specific genes in E. faecalis seems to be similar to the organization in S. carnosus. The open reading frame for enzyme IIIMtl E. faecalis is followed by a stem-loop structure, analogous to a typical Rho-independent terminator. We conclude that the mannitol-specific genes are organized in an operon and that the gene order is mtlA orfX mtlF mtlD.

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Selected References

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