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Cloning, sequencing, overexpression and characterization of l-rhamnose isomerase from Bacillus pallidus Y25 for rare sugar production

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Abstract

The l-rhamnose isomerase gene (L-rhi) encoding for l-rhamnose isomerase (l-RhI) from Bacillus pallidus Y25, a facultative thermophilic bacterium, was cloned and overexpressed in Escherichia coli with a cooperation of the 6×His sequence at a C-terminal of the protein. The open reading frame of L-rhi consisted of 1,236 nucleotides encoding 412 amino acid residues with a calculated molecular mass of 47,636 Da, showing a good agreement with the native enzyme. Mass-produced l-RhI was achieved in a large quantity (470 mg/l broth) as a soluble protein. The recombinant enzyme was purified to homogeneity by a single step purification using a Ni-NTA affinity column chromatography. The purified recombinant l-RhI exhibited maximum activity at 65°C (pH 7.0) under assay conditions, while 90% of the initial enzyme activity could be retained after incubation at 60°C for 60 min. The apparent affinity (K m) and catalytic efficiency (k cat/K m) for l-rhamnose (at 65°C) were 4.89 mM and 8.36 × 105 M−1 min−1, respectively. The enzyme demonstrated relatively low levels of amino acid sequence similarity (42 and 12%), higher thermostability, and different substrate specificity to those of E. coli and Pseudomonas stutzeri, respectively. The enzyme has a good catalyzing activity at 50°C, for d-allose, l-mannose, d-ribulose, and l-talose from d-psicose, l-fructose, d-ribose and l-tagatose with a conversion yield of 35, 25, 16 and 10%, respectively, without a contamination of by-products. These findings indicated that the recombinant l-RhI from B. pallidus is appropriate for use as a new source of rare sugar producing enzyme on a mass scale production.

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Correspondence to Goro Takata.

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Poonperm, W., Takata, G., Okada, H. et al. Cloning, sequencing, overexpression and characterization of l-rhamnose isomerase from Bacillus pallidus Y25 for rare sugar production. Appl Microbiol Biotechnol 76, 1297–1307 (2007). https://doi.org/10.1007/s00253-007-1109-3

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Keywords

  • l-Rhamnose isomerase
  • Bacillus pallidus
  • Rare sugar