食品研究与开发:2026,47(13):206-216
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基于酪氨酸位点工程改造的核桃高抗氧化衍生肽构效关系
龙熠1,孔姝怡1,安书涵1,戚少龙1,2,侯威宇1,2,林子腾3,李康4*,赵凡睿1,2*
(1.浙江农林大学 食品与健康学院,浙江 杭州 311300;2. 浙江农林大学 森林食物资源挖掘与利用全国重点实验室,浙江 杭州 311300;3. 浙江农林大学 集贤学院,浙江 杭州 311300;4. 浙江农林大学 光机电工程学院,浙江 杭州 311300)
Research on the Structure-Activity Relationship of High Antioxidant Walnut-Derived Peptides Based on Tyrosine Site Engineering Modification
LONG Yi1, KONG Shuyi1, AN Shuhan1, QI Shaolong1,2, HOU Weiyu 1,2, LIN Ziteng3,LI Kang4*, ZHAO Fanrui1,2*
(1. College of Food and Health, Zhejiang A & F University, Hangzhou 311300, Zhejiang, China; 2. National Key Laboratory for Development and Utilization of Forest Food Resources, Zhejiang A & F University,Hangzhou 311300, Zhejiang,China; 3. Jixian Honors College, Zhejiang A & F University, Hangzhou 311300, Zhejiang, China; 4 College of Optical, Mechanical and Electrical Engineering, Zhejiang A & F University, Hangzhou 311300, Zhejiang, China)
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投稿时间:2025-08-17    
中文摘要: 核桃肽Tyr-Val-Leu-Leu-Pro-Ser-Pro-Lys(YVLLPSPK)已被证明通过降低氧化损伤改善H2O2诱导HT-22细胞神经元损伤,缓解记忆障碍小鼠的学习记忆能力,具有神经保护功能。然而,核桃肽YVLLPSPK的抗氧化构效关系仍有待进一步探索。该研究针对酪氨酸(tyrosine,用Y表示)数量及位置,设计并探讨核桃衍生肽YVYLPSPK、YVLYPSPK和YVYYPSPK的抗氧化及构效关系。研究结果表明,核桃衍生肽YVYLPSPK、YVLYPSPK和YVYYPSPK的氧自由基吸附能力(oxygen radical absorbance capacity,ORAC)、羟自由基清除活性和ABTS+自由基清除活性显著高于核桃肽YVLLPSPK(p<0.05),其中核桃衍生肽YVLYPSPK和YVYYPSPK的抗氧化活性最强。体外氧化损伤细胞模型试验结果表明,与模型损伤组细胞相比,核桃衍生肽YVYLPSPK、YVLYPSPK和YVYYPSPK显著降低H2O2诱导HT-22细胞内活性氧(oxygen species,ROS)含量(p<0.05),显著增加谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-Px)和超氧化物歧化酶(superoxide dismutase,SOD)活性(p<0.05),其中,核桃衍生肽YVYYPSPK抗氧化活性最强。分子对接结果进一步显示,核桃衍生肽YVYYPSPK与ROS的结合能最低,为-7.626 kJ/mol;氢键结合数量最多(6个);且与核桃肽YVLLPSPK和核桃衍生肽YVYLPSPK、YVLYPSPK相比,YVYYPSPK与ROS的氢键结合位点在Met2029、Glu2027、Asn2084和Asp2102。
Abstract:Walnut peptide Tyr-Val-Leu-Leu-Pro-Ser-Pro-Lys (YVLLPSPK) has been demonstrated to ameliorate neuronal damage in H2O2-induced HT-22 cells by reducing oxidative damage, improve learning and memory capabilities in memory-impaired mice, and exhibit neuroprotective functions. However, the structureactivity relationship (SAR) of walnut peptide YVLLPSPK concerning its antioxidant properties remains to be further elucidated. This study focused on the number and position of tyrosine (Tyr, denoted as Y), designing and investigating the antioxidant activity and SAR of walnut-derived peptides YVYLPSPK, YVLYPSPK, and YVYYPSPK. The results indicated that the oxygen radical absorbance capacity (ORAC), hydroxyl radical scavenging activity, and ABTS+ radical scavenging activity of the walnut-derived peptides YVYLPSPK,YVLYPSPK, and YVYYPSPK were significantly higher than those of the original peptide YVLLPSPK (p<0.05), with YVLYPSPK and YVYYPSPK exhibiting the highest antioxidant activity.In vitro oxidative damage cell model assays revealed that, compared to the model injury group, the walnut-derived peptides YVYLPSPK, YVLYPSPK, and YVYYPSPK significantly reduced intracellular reactive oxygen species(ROS) levels in H2O2-induced HT-22 cells (p<0.05) and markedly increased the contents of glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) (p<0.05). Among them, YVYYPSPK demonstrated the highest antioxidant activity.Molecular docking analysis further indicated that the walnut-derived peptide YVYYPSPK exhibited the lowest binding energy (-7.626 kJ/mol) and the highest number of hydrogen bonds(6) with ROS. Additionally, compared to the original peptide YVLLPSPK and the walnut-derived peptides YVYLPSPK and YVLYPSPK, YVYYPSPK interacted with ROS at key binding sites, including Met2029,Glu2027, Asn2084, and Asp2102.
文章编号:202613026     中图分类号:    文献标志码:
基金项目:2024年浙江省大学生科技活动计划暨新苗人才计划资助项目(2024R412A037)
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