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Structure-activity relationship in buffalo spleen cathepsin B.
M Y Khan1, S K Agarwal, S Ahmad
1Department of Biochemistry, School of Life Sciences, North-Eastern Hill University, Shillong, India.
Journal of Biochemistry
|June 1, 1992
Summary
Buffalo spleen cathepsin B activity and structure were studied under varying pH and denaturant conditions. Alkaline pH caused irreversible inactivation, while acidic pH and moderate denaturants led to reversible loss of enzyme function.
Area of Science:
- Biochemistry
- Enzymology
- Protein Chemistry
Background:
- Cathepsin B is a crucial cysteine protease involved in various biological processes.
- Understanding its stability under different conditions is vital for its application and study.
Purpose of the Study:
- To investigate the effects of pH, urea, and guanidine hydrochloride on buffalo spleen cathepsin B activity and structure.
- To determine the reversibility and underlying mechanisms of enzyme inactivation.
Main Methods:
- Enzyme activity assays were performed under varying pH conditions.
- Spectroscopic techniques were used to assess structural changes induced by denaturants (urea, guanidine hydrochloride).
Main Results:
- Alkaline pH resulted in irreversible loss of both activity and structure.
- Acidic pH caused reversible inactivation with minimal secondary structure changes.
- Moderate denaturant concentrations led to reversible activity loss, attributed to active site perturbations.
- High denaturant concentrations induced irreversible inactivation linked to significant structural changes.
Conclusions:
- Buffalo spleen cathepsin B exhibits differential stability towards pH and denaturants.
- Reversible inactivation at acidic pH and moderate denaturant concentrations suggests localized structural effects.
- Irreversible inactivation at alkaline pH and high denaturant concentrations indicates significant protein unfolding.