Abstract
The gene of an l-rhamnose isomerase (RhaA) from Bacillus subtilis was cloned to the pET28a(+) and then expressed in the E. coli ER2566. The expressed enzyme was purified with a specific activity of 3.58 U/mg by His-Trap affinity chromatography. The recombinant enzyme existed as a 194 kDa tetramer and the maximal activity was observed at pH 8.0 and 60°C. The RhaA displayed activity for l-rhamnose, l-lyxose, l-mannose, d-allose, d-gulose, d-ribose, and l-talose, among all aldopentoses and aldohexoses and it showed enzyme activity for l-form monosaccharides such as l-rhamnose, l-lyxose, l-mannose, and l-talose. The catalytic efficiency (k cat/K m) of the recombinant enzyme for l-rhamnose, l-lyxose, and l-mannose were 7,460, 1,013, and 258 M/sec. When l-xylulose 100 g/L and l-fructose 100 g/L were used as substrates, the optimum concentrations of RpiB were determined with 6 and 15 U/mL, respectively. The l-lyxose 40 g/L was produced from l-xylulose 100 g/L by the enzyme during 60 min, while l-mannose 25 g/L was produced from l-fructose 100 g/L for 80 min. The results suggest that RhaA from B. subtilis is a potential producer of l-form monosaccharides.
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Park, CS. Characterization of a recombinant l-rhamnose isomerase from Bacillus subtilis and its application on production of l-lyxose and l-mannose. Biotechnol Bioproc E 19, 18–25 (2014). https://doi.org/10.1007/s12257-013-0597-5
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DOI: https://doi.org/10.1007/s12257-013-0597-5