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Purification and characterization of alkaline phosphatase from the gut of sea cucumber Stichopus japonicus.
- Source :
- Fisheries Science; May2013, Vol. 79 Issue 3, p477-485, 9p, 1 Diagram, 1 Chart, 4 Graphs
- Publication Year :
- 2013
-
Abstract
- An alkaline phosphatase was purified from the gut of sea cucumber Stichopus japonicus by n-butyl alcohol extract, ammonium sulfate precipitation, ion exchange chromatography with diethylaminoethyl cellulose, gel filtration chromatography with Sephacryl S-200 and preparative electrophoresis with polyacrylamide gel electrophoresis. The native enzyme was estimated to be 166 ± 9 kDa and produced a single predominant band corresponding to active enzyme on nondenaturing electrophoresis, but showed 2 bands of 97 and 35 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, suggesting that the native enzyme is composed of two dissimilar subunits. The enzyme displayed maximum activity at pH 11 and 40 °C, showing narrow pH stability (pH 10-12) and thermal instability at temperature higher than 30 °C. The activity of the purified alkaline phosphatase was enhanced by Mg, whereas inhibited by Zn, Ca and EDTA at 1 and 10 mM, suggesting its activity is in a magnesium ion-dependent manner. The product-analog WO and product HPO showed strong inhibitory effects on the enzyme activity. Using p-nitrophenyl phosphate as substrate, the V and K values were 24.45 μmol/L min and 5.76 mM, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09199268
- Volume :
- 79
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Fisheries Science
- Publication Type :
- Academic Journal
- Accession number :
- 87516700
- Full Text :
- https://doi.org/10.1007/s12562-013-0613-x