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Related Experiment Videos

Processing alpha-glucosidase I is an inverting glycosidase.

M M Palcic1, C H Scaman, A Otter

  • 1Department of Chemistry, University of Alberta, Edmonton, Canada. monica.palcic@ualberta.ca

Glycoconjugate Journal
|January 5, 2000
PubMed
Summary

Alpha-glucosidase I, crucial for glycoprotein synthesis and a target for antiviral drugs, operates with inversion of anomeric configuration. This mechanism, determined via NMR, is key for designing effective enzyme inhibitors.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Glycobiology

Background:

  • Alpha-glucosidase I is essential in N-linked oligosaccharide biosynthesis.
  • It catalyzes the first processing step after oligosaccharide transfer to proteins.
  • The enzyme is a target for antiviral agents impacting glycoprotein formation.

Purpose of the Study:

  • To determine the stereochemical course of the alpha-glucosidase I reaction.
  • To understand the mechanism of oligosaccharide hydrolysis.
  • To inform the design of mechanism-based inhibitors.

Main Methods:

  • Utilized a synthetic trisaccharide substrate (Glc(alpha1-2)Glc(alpha1-3)Glc alphaO(CH2)8COOCH3).
  • Monitored the release of glucose using 1H NMR spectroscopy.
  • Analyzed products from both yeast and bovine mammary gland alpha-glucosidase I.

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Main Results:

  • Both yeast and bovine mammary gland alpha-glucosidase I released beta-glucose.
  • The reaction produced the disaccharide Glc(alpha1-3)Glc alphaO(CH2)8COOCH3.
  • Demonstrated inversion of anomeric configuration for both enzymes.

Conclusions:

  • Alpha-glucosidase I catalyzes its reaction with inversion of anomeric configuration.
  • This stereochemical outcome is conserved between yeast and mammalian enzymes.
  • Understanding this mechanism is vital for developing targeted antiviral therapies.