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Salt effects on beta-glucosidase: pH-profile narrowing.

Erin M Bowers¹, Lindsey O Ragland, Larry D Byers

¹Department of Chemistry, Tulane University, New Orleans, LA 70118, USA.

Biochimica Et Biophysica Acta

|November 14, 2007

Summary

Salts inhibit sweet almond beta-glucosidase activity primarily by shifting the enzyme's pK(a) values, not by affecting its intrinsic catalytic rate. This salt-induced pK(a) shift influences the enzyme's pH profile and catalytic efficiency.

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Area of Science:

Biochemistry
Enzymology

Background:

Sweet almond beta-glucosidase activity is modulated by salt concentrations.
Enzyme activity is dependent on the protonation states of catalytic residues.

Purpose of the Study:

To investigate the inhibitory effects of various salts on sweet almond beta-glucosidase.
To elucidate the mechanism by which salts affect enzyme activity, specifically focusing on pK(a) shifts and reverse protonation.

Main Methods:

Assessed inhibition of beta-glucosidase by different cations and anions.
Analyzed the pH-dependence of kinetic parameters (k(cat)/K(m)) in the presence of varying salt concentrations.
Determined the impact of salt on apparent pK(a) values and the pH-independent catalytic rate constant.

Main Results:

Salts inhibit beta-glucosidase, with effectiveness varying by cation and anion type.
Inhibition is mainly due to salt-induced shifts in the enzyme's pK(a) values, altering the pH-activity profile.
The intrinsic catalytic rate constant ((k(cat)/K(m))(lim)) remains largely unaffected by salt concentration, ruling out significant reverse protonation contributions.

Conclusions:

Salt-induced pK(a) shifts are the primary mechanism of beta-glucosidase inhibition.
The study provides a method to assess the role of reverse protonation in other enzymes exhibiting salt-induced pK(a) shifts.