Related Experiment Video
Updated: May 23, 2026
Protein Target Prediction and Validation of Small Molecule Compound
Published on: February 23, 2024
Novel xanthine oxidase inhibitory peptides derived from Antarctic krill: Identification, molecular docking, molecular
Li Hao1, Qiaoji Tian2, Zhuqing Wang3
1State Key Laboratory of Marine Food Processing & Safety Control, College of Food Science and Engineering, Ocean University of China, No. 1299, Sansha Road, Qingdao, Shandong Province 266404, PR China; College of Life Sciences, Linyi University, Linyi 276005, China.
Abstract:
Xanthine oxidase (XO) inhibitory peptides are safe and effective candidates for alleviating hyperuricemia (HUA). In this study, two novel XO inhibitory peptides derived from Antarctic krill, Glu-Phe-Asp-Gly-Phe (EF-5) and Phe-Asp-Pro-Leu-Ile-Gln (FQ-6), were identified, with IC50 values of 0.68 and 0.79 mM, respectively. Molecular docking results demonstrated that hydrogen bonding and hydrophobic interactions were important in docking process and Lys771, Leu648, Leu1014, and Pro1076 were the main binding sites. Moreover, the XO + EF-5 and XO + FQ-6 complexes showed good stability during the molecular dynamics simulation process. EF-5 showed gastric stability and partial intestinal degradation with retained bioactivity, outperforming unstable FQ-6. In the HK-2 cell model, 1 mM EF-5 and FQ-6 reduced UA levels by 26.04% and 19.59%, respectively, possibly by regulating UA transporters (GLUT9, ABCG2, and MRP4) and alleviating HUA-related inflammation. The discovery of novel XO inhibitory peptides provides the research foundation for the development of nutritional supplements.
