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Related Experiment Videos

Purification of cytosolic beta-glucosidase from pig liver and its reactivity towards flavonoid glycosides.

N Lambert1, P A Kroon, C B Faulds

  • 1Cellular Metabolism Section, Diet, Health and Consumer Sciences Division, Institute of Food Research, Norwich Research Park, Colney, Norwich, UK.

Biochimica Et Biophysica Acta
|November 24, 1999
PubMed
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Mammalian cytosolic beta-glucosidase can deglycosylate some dietary flavonoid glycosides, impacting their health benefits. This enzyme

Area of Science:

  • Biochemistry
  • Nutrition
  • Enzymology

Background:

  • Flavonoid glycosides are dietary compounds with potential health benefits.
  • Their metabolism influences bioactivity and intestinal uptake.
  • Cytosolic beta-glucosidase is a potential enzyme for flavonoid deglycosylation.

Purpose of the Study:

  • To purify pig liver cytosolic beta-glucosidase.
  • To test its ability to deglycosylate various flavonoid glycosides.
  • To understand the enzyme's role in flavonoid metabolism.

Main Methods:

  • Purification of cytosolic beta-glucosidase from pig liver to homogeneity.
  • Enzyme characterization (molecular weight, specific activity).
  • Substrate specificity testing with various flavonoid glycosides and p-nitrophenol glucoside.

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Main Results:

  • Pig liver cytosolic beta-glucosidase was purified and characterized.
  • The enzyme deglycosylated genistein 7-glucoside, daidzein 7-glucoside, apigenin 7-glucoside, naringenin 7-glucoside, and quercetin 4'-glucoside.
  • Activity was not detected for naringenin 7-rhamnoglucoside and certain quercetin glycosides. Kinetic parameters (Km, Vmax) were determined.
  • Quercetin 3-glucoside inhibited deglycosylation of quercetin 4'-glucoside.

Conclusions:

  • Mammalian cytosolic beta-glucosidase can deglycosylate specific dietary flavonoid glycosides.
  • This enzymatic activity is likely important for flavonoid metabolism and bioavailability.
  • The enzyme's substrate specificity influences which flavonoids are affected.