Marine Drugs (2019-11-01)

Quantitative Structure-Activity Relationship Model to Predict Antioxidant Effects of the Peptide Fraction Extracted from a Co-Culture System of Chlorella pyrenoidosa and Yarrowia lipolytica

  • Huifan Liu,
  • Sufen Li,
  • Yuming Zhong,
  • Jianliang Liu,
  • Hui Liu,
  • Jian Cheng,
  • Lukai Ma,
  • Yuqing Huang,
  • Xuanyi Cai,
  • Haijun Liu,
  • Jiantong Zheng,
  • Zhongai Su,
  • Qin Wang

DOI
https://doi.org/10.3390/md17110633
Journal volume & issue
Vol. 17, no. 11
p. 633

Abstract

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In this study, the antioxidant components in co-culture of Chlorella pyrenoidosa and Yarrowia lipolytica (3:1 ratio) were confirmed as trypsin-hydrolyzed peptides (EHPs). The EHPs were composed of 836 different peptides with molecular weights ranging from 639 to 3531 Da and were mainly composed of hydrophobic amino acids (48.1%). These peptides showed remarkable protective effects against oxidative stress in HepG2, which may be attributed to their structures. Furthermore, the mRNA and protein levels of nuclear factor erythroid 2-related factor 2 (Nrf2) were significantly lower in the peptide-treated group than in the control group, suggesting that the antioxidant enzyme-coding genes were not activated. The EC50 value of three peptides in the EHPs were in the order of AGYSPIGFVR (0.04 ± 0.002 mg/mL) > VLDELTLAR (0.09 ± 0.001 mg/mL) > LFDPVYLFDQG (0.41 ± 0.03 mg/mL); these results agreed with the prediction of the model (R2 > 0.9, Q2 > 0.5). Thus, EHPs show potential as potent new antioxidant agents.

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