Kinetic studies on the broad-specificity β-D-glucosidase from pig kidney

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Abstract

A broad-specificity β-D-glucosidase from pig kidney cortex was isolated and purified to homogeneity by a rapid purification procedure. The pI (5.14 ± 0.05), M(r) (59000 ± 2000) and specific activities with several p-nitrophenyl glycosides (galactopyranoside, glucopyranoside, arabinopyranoside, xylopyranoside) were comparable with those published previously for cytoplasmic β-D-glucosidase from other sources and organs. Mixed-substrate experiments and inhibition studies with glucono-(1 → 5)-lactone revealed that a single active centre, containing one catalytic site and one saccharide-binding site, was responsible for the splitting of all four synthetic substrates. Inhibition experiments with substrate analogues demonstrated that (i) the major binding determinant of the glycosides was the aglycone moiety, (ii) an anionic side chain of the enzyme (probably a carboxy group) interacted with the glycosidic linkages and (iii) the properties of the aglycone significantly influenced the binding of the carbohydrate moiety. The inhibition constants of the p-nitrothiophenyl derivatives were in good agreement with the K(m) values of the corresponding substrates. Therefore the Michaelis constants could be regarded as true equilibrium constants (K(s)). The 'three-point-attachment model' of the substrate splitting, proposed by Daniels [(1983) Ph.D. Dissertation, University of Pittsburgh] for the analogous liver enzyme, was applicable for β-D-glucosidase from pig kidney too. The possible nature of the 'attachments' is discussed.

Original languageEnglish
Pages (from-to)139-146
Number of pages8
JournalBiochemical Journal
Volume256
Issue number1
Publication statusPublished - 1988

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Glucosidases
Swine
Glycosides
Kidney
Kinetics
Substrates
Kidney Cortex
Lactones
Enzymes
Galactose
Catalytic Domain
Binding Sites
Carbohydrates
Equilibrium constants
Liver
Purification
Experiments
Derivatives

ASJC Scopus subject areas

  • Biochemistry

Cite this

Kinetic studies on the broad-specificity β-D-glucosidase from pig kidney. / Pócsi, I.; Kiss, L.

In: Biochemical Journal, Vol. 256, No. 1, 1988, p. 139-146.

Research output: Contribution to journalArticle

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