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α-glucosidase from grape berries: Partial purification and characterization
A D Peruffo1, F Renosto, C Pallavicini
1Istituto di Chimica Agraria, Via Gradenigo, 6, I-35100, Padova, Italy.
Planta
|January 11, 2014
Summary
Grape berry α-glucosidase was purified and characterized. This enzyme, important for carbohydrate breakdown, shows stability and specific inhibition patterns, suggesting potential applications.
Area of Science:
- Biochemistry
- Enzymology
Background:
- α-Glucosidase (EC 3.2.1.20) plays a key role in carbohydrate metabolism.
- Understanding grape berry enzymes is crucial for food science and biotechnology.
Purpose of the Study:
- To purify and characterize α-glucosidase from Vitis vinifera var. Riesling.
- To investigate the enzyme's substrate specificity, kinetics, and inhibition patterns.
Main Methods:
- Enzyme purification using chromatography.
- Enzyme activity assays at varying pH.
- Kinetic analysis and inhibition studies.
Main Results:
- α-Glucosidase purified ~30-fold from grape berries.
- Optimal activity at pH 5.1, molecular weight ~100,000 Da.
- Inhibition studies suggest a Ping-Pong kinetic mechanism, treatable as a Uni Bi system.
Conclusions:
- The purified grape berry α-glucosidase is stable and exhibits specific kinetic properties.
- The enzyme may exist in multiple forms (pI 7.2, 8.2) and does not require ions.
- Findings provide insights into grape berry carbohydrate processing and enzyme behavior.
