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A spectrophotometric assay for glucosidase I
I Neverova1, C H Scaman, O P Srivastava
1Department of Chemistry, University of Alberta, Edmonton, Canada.
Analytical Biochemistry
|October 1, 1994
Summary
A new spectrophotometric assay quantifies glucosidase I activity using a specific synthetic trisaccharide substrate. This method enables accurate enzyme monitoring and kinetic studies.
Area of Science:
- Biochemistry
- Enzymology
Background:
- Glucosidase I is a key enzyme in glycoprotein processing.
- Accurate assays are crucial for studying enzyme kinetics and inhibition.
Purpose of the Study:
- To develop and validate a novel spectrophotometric assay for glucosidase I.
- To demonstrate the assay's utility in enzyme isolation and kinetic studies.
Main Methods:
- Utilized a synthetic trisaccharide substrate (alpha-D-Glc 1-->2 alpha-D-Glc 1-->3 alpha-D-Glc-O(CH2)8COOCH3).
- Quantified released terminal glucose using a glucose oxidase-peroxidase-o-dianisidine system.
- Tested the assay with 1-deoxynorjirimycin for inhibition studies.
Main Results:
- The assay demonstrated specificity for glucosidase I.
- The assay successfully monitored enzyme activity during isolation.
- Kinetic and inhibition studies were effectively performed using the assay.
Conclusions:
- A reliable spectrophotometric assay for glucosidase I has been established.
- The assay is suitable for enzyme purification, kinetic analysis, and inhibitor screening.