1887

Abstract

DSM 792 accumulates and phosphorylates mannitol via a phosphoenolpyruvate (PEP)-dependent phosphotransferase system (PTS). PEP-dependent mannitol phosphorylation by extracts of cells grown on mannitol required both soluble and membrane fractions. Neither the soluble nor the membrane fraction could be complemented by the opposite fraction prepared from glucose-grown cells, indicating that the mannitol-specific PTS consists of both a soluble (IIA) and a membrane-bound (IICB) component. The mannitol () operon of DSM 792 comprises four genes in the order . Sequence analysis of deduced protein products indicated that the and genes respectively encode the IICB and IIA components of the mannitol PTS, which is a member of the fructose-mannitol (Fru) family. The gene product is a mannitol-1-phosphate dehydrogenase, while encodes a putative transcriptional regulator. MtlR contains two PTS regulatory domains (PRDs), which have been found in a number of DNA-binding transcriptional regulators and in transcriptional antiterminators of the BglG family. Also, near the C-terminus is a well-conserved signature motif characteristic of members of the IIA/IIA/IIA PTS protein family. These regions are probably the sites of PTS-dependent phosphorylation to regulate the activity of the protein. A helix–turn–helix DNA-binding motif was not found in MtlR. Transcriptional analysis of the genes by Northern blotting indicated that the genes were transcribed as a polycistronic operon, expression of which was induced by mannitol and repressed by glucose. Primer extension experiments identified a transcriptional start point 42 bp upstream of the start codon. Two catabolite-responsive elements (CREs), one of which overlapped the putative −35 region of the promoter, were located within the 100 bp upstream of the start codon. These sequences may be involved in regulation of expression of the operon.

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2001-01-01
2019-12-15
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