Abstract
Angiotensin-I converting enzyme (ACE) inhibitors are widely used to control hypertension. In this study, protein hydrolysates from shiitake mushroom were hydrolyzed to prepare ACE-inhibitory peptides. Optimum process conditions for the hydrolysis of shiitake mushrooms using Alcalase were optimized using response surface methodology. Monitoring was conducted to check the degree of hydrolysis (DH) and ACE inhibitory activity. In the results, the optimum condition with the highest DH value of 28.88% was 50.2 °C, 3-h hydrolysis time, and 1.16 enzyme/substrate ratios. The highest ACE inhibitory activity (IC50 of 0.33 μg/mL) was under 47 °C, 3 h 28 min hydrolysis time, and 0.59 enzyme/substrate ratios. The highest activity was fractionated into 5 ranges of molecular weight, and the fraction below 0.65 kDa showed the highest activity with IC50 of 0.23 μg/mL. This fraction underwent purification using RP-HPLC, meanwhile the peak which offered a retention time of about 37 min showed high ACE inhibitory activity. Mass spectrometry identified the amino acid sequence of this peak as Lys-Ile-Gly-Ser-Arg-Ser-Arg-Phe-Asp-Val-Thr (KIGSRSRFDVT), with a molecular weight of 1265.43 Da. The synthesized variant of this peptide produced an ACE inhibitory activity (IC50) of 37.14 μM. The peptide KIGSRSRFDVT was shown to serve as a non-competitive inhibitor according to the Lineweaver–Burk plot findings. A molecular docking study was performed, which showed that the peptide binding occurred at an ACE non-active site. The findings suggest that peptides derived from shiitake mushrooms could serve either as useful components in pharmaceutical products, or in functional foods for the purpose of treating hypertension.
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Acknowledgements
The authors would like to thank the Institute of Biotechnology and Genetic Engineering, Chulalongkorn University, for their support and providing access to their facilities. We acknowledge the financial support from the Grant for Research: The Research Assistantship Fund, Faculty of Science, Chulalongkorn University (RAF_2561_009), and The Ratchadapisek Sompoch Endowment Fund (2019), Chulalongkorn University (762008) for providing the financial support for this research.
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Paisansak, S., Sangtanoo, P., Srimongkol, P. et al. Angiotensin-I converting enzyme inhibitory peptide derived from the shiitake mushroom (Lentinula edodes). J Food Sci Technol 58, 85–97 (2021). https://doi.org/10.1007/s13197-020-04517-z
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DOI: https://doi.org/10.1007/s13197-020-04517-z