beta-Glucosidase, exo-beta-glucanase and pyridoxine transglucosylase activities of rice BGlu1

  • Rodjana OPASSIRI
    Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
  • Yanling HUA
    Center for Scientific and Technological Equipment, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
  • Onnop WARA-ASWAPATI
    Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
  • Takashi AKIYAMA
    Department of Low Temperature Science, National Agricultural Research Center for the Hokkaido Region, Sapporo 062-8555, Japan
  • Jisnuson SVASTI
    Department of Biochemistry and Center for Protein Structure and Function, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
  • Asim ESEN
    Department of Biology, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0406, U.S.A.
  • James R. KETUDAT CAIRNS
    Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand

Abstract

<jats:p>The bglu1 cDNA for a β-glucosidase cloned from rice (Oryza sativa L.) seedlings was expressed as a soluble and active protein in Escherichia coli and designated BGlu1. This enzyme hydrolysed β-1,4-linked oligosaccharides with increasing catalytic efficiency (kcat/Km) values as the DP (degree of polymerization) increased from 2 to 6. In contrast, hydrolysis of β-1,3-linked oligosaccharides decreased from DP 2 to 3, and polymers with a DP greater than 3 were not hydrolysed. The enzyme also hydrolysed p-nitrophenyl β-d-glycosides and some natural glucosides but with lower catalytic efficiency than β-linked oligosaccharides. Pyridoxine 5´-O-β-d-glucoside was the most efficiently hydrolysed natural glycoside tested. BGlu1 also had high transglucosylation activity towards pyridoxine, producing pyridoxine 5´-O-β-d-glucopyranoside in the presence of the glucose donor p-nitrophenyl β-d-glucoside.</jats:p>

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