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In silico assessment and structural characterization of antioxidant peptides from major yolk protein of sea urchin Strongylocentrotus nudus

Abstract

Sea urchin gonads have been demonstrated to contain major yolk protein (MYP), which can be hydrolyzed by enzymes to release biologically active peptides. In silico analysis of the MYP sequence in the BIOPEP database showed the presence of fragments with antioxidant activity. The sequence was hydrolyzed by 21 kinds of proteases and 23 antioxidant peptides were obtained. Eight peptides, including Leu-Trp (LW), Arg-Trp (RW), Ala-Trp (AW), Thr-Trp (TW), Ala-Asp-Phe (ADF), Leu-Trp-Lys (LWK), Ser-Asp-Phe (SDF) and Leu-Tyr (LY) were screened and obtained a score over 0.5 by PeptideRanker. The peptides LW, TW and LWK showed stronger antioxidant capacity with IC50 values of 8.85, 9.59 and 9.62 mmol/L, respectively, compared to that of glutathione (10.81 mmol/L). Furthermore, AW, LW and LY showed Trolox equivalent antioxidant capacity (TEAC) values of 3.07, 1.87 and 1.52 mmoL TE/mmoL peptide, respectively. These results suggest MYP from sea urchin (S. nudus) gonads is a good source of antioxidant peptides with abundant tryptophan.

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Publication details

The article was received on 23 Aug 2018, accepted on 25 Oct 2018 and first published on 25 Oct 2018


Article type: Paper
DOI: 10.1039/C8FO01668B
Citation: Food Funct., 2018, Accepted Manuscript
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    In silico assessment and structural characterization of antioxidant peptides from major yolk protein of sea urchin Strongylocentrotus nudus

    W. Shang, Y. Tang, S. Su, J. Han, J. Yan, H. Wu and B. Zhu, Food Funct., 2018, Accepted Manuscript , DOI: 10.1039/C8FO01668B

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