Biotechnology and Bioprocess Engineering

, Volume 13, Issue 5, pp 533–539

Purification and characterization of extracellular inulinase from a marine yeast Pichia guilliermondii and inulin hydrolysis by the purified inulinase

Authors

  • Fang Gong
    • Unesco Chinese Center of Marine BiotechnologyOcean University of China
  • Tong Zhang
    • Unesco Chinese Center of Marine BiotechnologyOcean University of China
    • Unesco Chinese Center of Marine BiotechnologyOcean University of China
  • Jun Sheng
    • Unesco Chinese Center of Marine BiotechnologyOcean University of China
  • Jing Li
    • Unesco Chinese Center of Marine BiotechnologyOcean University of China
  • Xianghong Wang
    • Unesco Chinese Center of Marine BiotechnologyOcean University of China
Article

DOI: 10.1007/s12257-007-0177-7

Cite this article as:
Gong, F., Zhang, T., Chi, Z. et al. Biotechnol Bioproc E (2008) 13: 533. doi:10.1007/s12257-007-0177-7

Abstract

The extracellular inulinase of the marine yeast Pichia guilliermondii strain 1 was purified to homogeneity resulting in a 7.2-fold increase in specific inulinase activity. The molecular mass of the purified enzyme was estimated to be 50.0 kDa. The optimal pH and temperature for the purified enzyme were 6.0 and 60°C, respectively. The enzyme was activated by Mn2+, Ca2+, K+, Li+, Na+, Fe3+, Fe2+, Cu2+, and Co2+, but Mg2+, Hg2+, and Ag+ inhibited activity. The enzyme was strongly inhibited by phenylmethanesulphonyl fluoride (PMSF), iodoacetic acid, EDTA, and 1, 10-phenanthroline. The Km and Vmax values of the purified inulinase for inulin were 21.1 mg/mL and 0.08 mg/min, respectively. A large number of monosaccharides were detected after the hydrolysis of inulin. The deduced protein sequence from the cloned P. guilliermondii strain 1 inulinase gene contained the consensus motifs R-D-P-K-V-F-W-H and W-M-N-D-P-N-G, which are conserved among the inulinases from other microorganisms.

Keywords

inulinaseinulinase genemarine yeastspurificationPichia guilliermondii

Copyright information

© The Korean Society for Biotechnology and Bioengineering and Springer-Verlag Berlin Heidelberg GmbH 2008