Purification and immobilization of the recombinant Brassica oleracea Chlorophyllase 1 (BoCLH1) on DIAION®CR11 as potential biocatalyst for the production of chlorophyllide and phytol

Molecules. 2015 Feb 24;20(3):3744-57. doi: 10.3390/molecules20033744.

Abstract

Recombinant Brassica oleracea chlorophyllase 1 (BoCLH1) with a protein molecular weight of 38.63 kDa was successfully expressed in E. coli and could catalyze chlorophyll (Chl) hydrolysis to chlorophyllide and phytol in vitro. In this study, we used DIAION®CR11, a highly porous cross-linked polystyrene divinylbenzene-based metal chelator, for purifying and immobilizing the poly (His)-tagged enzyme. The Cu(II) showed the highest protein adsorption (9.2 ± 0.43 mg/g gel) and enzyme activity (46.3 ± 3.14 U/g gel) for the immobilization of the poly (His)-tagged recombinant BoCLH1 compared with other metal chelators. Biochemical analysis of the immobilized enzyme showed higher chlorophyllase activity for Chl a hydrolysis in a weak base environment (pH 8.0), and activity above 70% was in a high-temperature environment, compared with the free enzyme. In addition, compared with free BoCLH1, the enzyme half-life (t1/2) of the immobilized BoCLH1 increased from 25.42 to 54.35 min (approximately two-fold) at 60 °C. The immobilized enzyme retained a residual activity of approximately 60% after 17 cycles in a repeated-batch operation. Therefore, DIAION®CR11Cu(II)-immobilized recombinant BoCLH1 can be repeatedly used to lower the cost and is potentially useful for the industrial production of chlorophyllide and phytol.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Brassica / enzymology*
  • Carboxylic Ester Hydrolases / genetics
  • Carboxylic Ester Hydrolases / isolation & purification*
  • Carboxylic Ester Hydrolases / metabolism*
  • Catalysis
  • Chelating Agents / chemistry
  • Chelating Agents / metabolism
  • Chlorophyll / metabolism*
  • Chlorophyll A
  • Chlorophyllides / metabolism*
  • Cross-Linking Reagents / chemistry
  • Enzymes, Immobilized / genetics
  • Enzymes, Immobilized / metabolism*
  • Escherichia coli / genetics
  • Escherichia coli / metabolism
  • Half-Life
  • Hydrogen-Ion Concentration
  • Hydrolysis
  • Kinetics
  • Phytol / metabolism*
  • Polystyrenes / chemistry
  • Polystyrenes / metabolism
  • Recombinant Proteins / genetics
  • Recombinant Proteins / metabolism*
  • Vinyl Compounds / chemistry
  • Vinyl Compounds / metabolism

Substances

  • Chelating Agents
  • Chlorophyllides
  • Cross-Linking Reagents
  • Enzymes, Immobilized
  • Polystyrenes
  • Recombinant Proteins
  • Vinyl Compounds
  • Chlorophyll
  • Phytol
  • Carboxylic Ester Hydrolases
  • chlorophyllase
  • divinyl benzene
  • Chlorophyll A