A gene encoding mannitol-2-dehydrogenase (E.C. 1.1.1.138) (MDH) was cloned from Lactobacillus reuteri and expressed in Escherichia coli. The 1,008-bp gene encodes a protein consisting of 336 amino acids, with a predicted molecular mass of 35,920 Da. The deduced amino acid sequence of L. reuteri MDH (LRMDH) is 77% and 76% similar to the MDHs from Leuconostoc mesenteroides and Leuconostoc pseudomesenteroides, respectively. The purified recombinant enzyme appears as a single band of 40 kDa in sodium dodecyl sulfate-polyacrylamide gel electrophoresis, but gel filtration indicates that the native enzyme is a dimer. The optimum temperature for the recombinant enzyme is 37 degrees C, the pH optima for D-fructose reduction and D-mannitol oxidation are 5.4 and 6.2, respectively. The K(m) values for NAD (9 mM) and NADH (0.24 mM) are significantly higher than those for NADP (0.35 mM) and NADPH (0.04 mM). The K(m) values of LRMDH for D-fructose and D-mannitol are 34 mM and 54 mM, respectively. Contrary to what the enzyme sequence suggests, recombinant LRMDH contains a single catalytic zinc per subunit.
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