Biotechnology Letters

, Volume 32, Issue 2, pp 299–304 | Cite as

Characterization of a recombinant l-fucose isomerase from Caldicellulosiruptor saccharolyticus that isomerizes l-fucose, d-arabinose, d-altrose, and l-galactose

Original Research Paper


A recombinant l-fucose isomerase from Caldicellulosiruptor saccharolyticus was purified as a single 68 kDa band with an activity of 76 U mg−1. The molecular mass of the native enzyme was 204 kDa as a trimer. The maximum activity for l-fucose isomerization was at pH 7 and 75°C in the presence of 1 mM Mn2+. Its half-life at 70°C was 6.1 h. For aldose substrates, the enzyme displayed activity in decreasing order for l-fucose, with a k cat of 11,910 min−1 and a K m of 140 mM, d-arabinose, d-altrose, and l-galactose. These aldoses were converted to the ketoses l-fuculose, d-ribulose, d-psicose, and l-tagatose, respectively, with 24, 24, 85, 55% conversion yields after 3 h.


l-Arabinose Caldicellulosiruptor saccharolyticus l-Fucose l-Fucose isomerase Sugar isomerase Thermostable enzyme 



This study was supported by a grant (R0A-2007-000-20015-0) from the National Research Lab. Program, Ministry of Education, Science and Technology.


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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Department of Bioscience and BiotechnologyKonkuk UniversitySeoulSouth Korea

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