Purification and characterization of a phytate-degrading enzyme from germinated faba beans (Vicia faba Var. Alameda) |
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Authors: | Greiner R Muzquiz M Burbano C Cuadrado C Pedrosa M M Goyoaga C |
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Affiliation: | Federal Research Centre for Nutrition, Centre for Molecular Biology, Haid-und-Neu-Strasse 9, D-76131 Karlsruhe, Germany. ralf.greiner@bfe.uni-karlruhe.de |
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Abstract: | A phytate-degrading enzyme was purified approximately 2190-fold from germinated 4-day-old faba bean seedlings to apparent homogeneity with a recovery of 6% referred to the phytase activity in the crude extract. It behaves as a monomeric protein of a molecular mass of approximately 65 kDa. The phytate-degrading enzyme belongs to the acidic phytases. It exhibits a single pH optimum at 5.0. Optimal temperature for the degradation of sodium phytate is 50 degrees C. Kinetic parameters for the hydrolysis of sodium phytate are K(M) = 148 micromol L(-1) and k(cat) = 704 s(-1) at 35 degrees C and pH 5.0. The faba bean phytase exhibits a broad affinity for various phosphorylated compounds and hydrolyzes phytate in a stepwise manner. The first hydrolysis product was identified as D/L-myo-inositol(1,2,3,4,5)pentakisphosphate. |
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