Purification and Characterization of the $Exo-{\beta}-D-Glucosaminidase$ from Aspergillus flavus IAM2044

  • Ji, Jae-Hoon (Devision of Appiied Life Science, Graduate School, Gyeongsang National University) ;
  • Yang, Ju-Seok (Devision of Appiied Life Science, Graduate School, Gyeongsang National University) ;
  • Hur, Jong-Wha (Institute of Agriculture and Science, Gyeongsang National University)
  • Published : 2003.04.01

Abstract

Chitosan-degrading activity induced by chitosan was founf in culture filtrate of Aspergillus flavus IAM2044. Aspergillus flavus IAM2044 had a higher level of chitosanolytic activity when chitosan was used as a carbon source, and yeast extract and peptone were supplemented as nitrogen sources. One of the chitosan-degrading enzymes was purified to homogeneity by ammonium sulfate precipitation followed by cation-exchange and gel filtration chromatographies. The enzyme was monomeric, and its molecular mass was 45 kDa. The optimum pH and temperature of the enzyme were 5.0 and $50^{\circ}C$, respectively. The activity was stable in the pH range of 3.5 to 7.0 and at a temperature below $50^{\circ}C$. Reaction products analyzed by the viscosimetric assay and thin layer chromatography clearly indicated that the enzyme was an exe-type chitosanase, $exo-{\beta}-D-glucosaminidase$, that released GlcN from the nonreducing ends of the oligosaccharide chains.

Keywords

References

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