CHARACTERIZATION OF MONOHEADED TRYPSIN INHIBITORS FROM THE SEEDS OF ABELMOSCHUS MOSCHATUS L.
DOI:
https://doi.org/10.22159/ajpcr.2018.v11i12.28735Keywords:
Trypsin inhibitors, Abelmoschus moschatus, Serpins, Non-competitive, Monoheaded inhibitorsAbstract
Objective: The objective of the present study was to characterize the monoheaded trypsin inhibitors, Abelmoschus moschatus trypsin inhibitor-I (AMTI-I) and AMTI-II from the seeds of A. moschatus with respect to their specificity, mode of action, and active site residues.
Methods: Standard methods were followed in determining inhibitory activities of monoheaded inhibitors. IC50 values and inhibitory constants (Ki) of AMTI-I and AMTI-II were determined. Studies on complex formation and chemical modification of inhibitors were performed.
Results: AMTI-I and AMTI-II were found to be serpins, strongly active against trypsin, moderately active against porcine elastase, Staphylococcus aureus protease, and Aspergillus oryzae protease. AMTI-I and AMTI-II have shown non-competitive type of inhibition toward bovine trypsin with Ki values of inhibitors for trypsin found to be 0.25±0.02 nM and 0.22±0.06 nM, respectively. Complex studies revealed the formation of stable 1:1 complex of trypsin with both AMTI-I and AMTI-II. Chemical modification of the functional groups of the inhibitors by selective reagents indicated that arginine residues are essential for their trypsin inhibitory activities.
Conclusion: Investigations on the specificity of protease inhibitors are important for understanding their physiological role, control mechanisms involved in the regulation of proteolysis in biological systems and mode of action.
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