Discovery of monoamine oxidase A inhibitory peptides from hairtail (Trichiurus japonicus) using in vitro simulated gastrointestinal digestion and in silico studies

摘要

The aim of this study was to effectively obtain monoamine oxidase A (MAO-A) inhibitory peptides from in vitro simulated gastrointestinal digestion and to assess the correspondences between in silico prediction and in vitro confirmation. Fractions (< 3 kDa) from ultrafiltration of pepsin and simulated gastrointestinal enzymes hy-drolysates exhibited the highest MAO-A inhibitory activity with IC50 values of 0.61 and 2.54 mg/mL, respec-tively. After sequencing and then screening by HPEPDOCK, 11 high-score peptides and 2 low-score peptides were selected for further synthesis. Remarkable correlation was found between (-)docking scores and MAO-A inhibitory activity of the synthesized peptides, and among which VVFEVFW showed the highest MAO-A in-hibitory activity (IC50 = 0.405 mM). Current research suggested that in silico is an effective method to screen MAO-A inhibitory peptides from hairtail protein hydrolysates, and these peptides can be used as functional ingredients for MAO-A inhibition or potential alternatives for antidepressant.

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