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Inactivation of a subtilisin in colloidal systems
M C Maste1, H A Rinia, C M Brands
1Department of Physical and Colloid Chemistry, Wageningen Agricultural University, The Netherlands.
Biochimica Et Biophysica Acta
|October 25, 1995
Summary
Enzyme inactivation depends on surface interactions. Hydrophobic surfaces accelerate Savinase enzyme degradation, while hydrophilic surfaces offer stability, impacting autocatalytic rates.
Area of Science:
- Biochemistry
- Enzyme kinetics
- Surface chemistry
Background:
- Enzyme activity is crucial in various industrial applications.
- Understanding enzyme stability and inactivation mechanisms is vital for process optimization.
- Savinase, a proteolytic enzyme, is susceptible to inactivation.
Purpose of the Study:
- To investigate the relationship between Savinase enzyme inactivation and its adsorption onto different solid-liquid interfaces.
- To quantify the effect of various particle surfaces on the enzyme's stability and degradation rate.
Main Methods:
- Enzyme activity loss was measured in solution and with colloidal particles.
- Adsorption of Savinase onto hydrophobic (Teflon, polystyrene latex) and hydrophilic (silica) surfaces was studied.
- The impact of poly(ethylene oxide) grafted polystyrene particles on enzyme stability was assessed.
Main Results:
- Savinase undergoes autolytic degradation, reducing its biological activity.
- Hydrophobic surfaces (Teflon, polystyrene latex) significantly reduced enzyme half-life to 0.7 hours from 3.5 hours in solution.
- Hydrophilic silica particles stabilized the enzyme against autolysis.
- Steric effects from poly(ethylene oxide) chains on polystyrene particles also mitigated inactivation.
Conclusions:
- The nature of the surface critically influences how Savinase adsorbs.
- Adsorption mode dictates the enzyme's susceptibility to autocatalytic degradation.
- Surface properties can be engineered to control enzyme stability and activity.
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