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Thermostability of Bacillus subtilis neutral protease
V G Eijsink1, B van den Burg, G Vriend
1Department of Genetics, Centre of Biological Sciences, Haren, The Netherlands.
Biochemistry International
|June 1, 1991
Summary
The thermostability of Bacillus subtilis neutral protease was investigated. Thermal inactivation is primarily driven by local unfolding preceding autolysis, not autodigestion rates.
Area of Science:
- Biochemistry
- Enzymology
- Protein Chemistry
Background:
- Bacillus subtilis neutral protease is a key industrial enzyme.
- Understanding enzyme stability is crucial for optimizing industrial processes.
- Autolysis is a common mechanism for enzyme inactivation at high temperatures.
Purpose of the Study:
- To investigate the thermostability of B. subtilis neutral protease.
- To elucidate the mechanism of thermal inactivation.
- To identify factors influencing enzyme stability.
Main Methods:
- Enzyme activity assays under varying temperatures and pH.
- Monitoring enzyme inactivation rates.
- Investigating the role of enzyme concentration and presence of other proteases.
Main Results:
- The enzyme undergoes autolysis at elevated temperatures, leading to inactivation.
- Enzyme inactivation rate is independent of enzyme concentration.
- Optimal stability is observed near the enzyme's pH optimum.
- A second protease did not affect the inactivation rate at high temperatures.
Conclusions:
- Thermal inactivation of B. subtilis neutral protease is governed by the kinetics of local unfolding preceding autolysis.
- The rate-limiting step is not the catalytic rate of autodigestion or irreversible unfolding.
- These findings provide insights into enzyme stabilization strategies.