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Cloning and Molecular Analysis of a Mannitol Operon of Phosphoenolpyruvate-dependent Phosphotransferase (PTS) Type from Vibrio Cholerae O395

Overview
Journal Arch Microbiol
Specialty Microbiology
Date 2010 Dec 25
PMID 21184218
Citations 17
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Abstract

A putative mannitol operon of the phosphoenolpyruvate phosphotransferase (PTS) type was cloned from Vibrio cholerae O395, and its activity was studied in Escherichia coli. The 3.9-kb operon comprising three genes is organized as mtlADR. Based on the sequence analysis, these were identified as genes encoding a putative mannitol-specific enzyme IICBA (EII(Mtl)) component (MtlA), a mannitol-1-phosphate dehydrogenase (MtlD), and a mannitol operon repressor (MtlR). The transport of [(3)H]mannitol by the cloned mannitol operon in E. coli was 13.8 ± 1.4 nmol/min/mg protein. The insertional inactivation of EII(Mtl) abolished mannitol and sorbitol transport in V. cholerae O395. Comparison of the mannitol utilization apparatus of V. cholerae with those of Gram-negative and Gram-positive bacteria suggests highly conserved nature of the system. MtlA and MtlD exhibit 75% similarity with corresponding sequences of E. coli mannitol operon genes, while MtlR has 63% similarity with MtlR of E. coli. The cloning of V. cholerae mannitol utilization system in an E. coli background will help in elucidating the functional properties of this operon.

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