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Quantitative analysis of the relationship between structure and antioxidant activity of tripeptides.
Journal of Peptide Science ( IF 1.8 ) Pub Date : 2020-01-12 , DOI: 10.1002/psc.3238
Shinya Uno 1 , Daisuke Kodama 1 , Hiroko Yukawa 1 , Hiroyuki Shidara 1 , Miki Akamatsu 2
Affiliation  

Peptides from enzymatic hydrolysates of food proteins exhibit significant antioxidant activity. Several studies have attempted to determine the factors contributing to the antioxidant activity of peptides; however, the physicochemical properties and factors essential for the antioxidant activity of peptides are still unclear. In this study, in order to clarify the factors important for peptide antioxidant activity based on the properties of component amino acids, 55 tripeptides were synthesized from 20 natural amino acids and their antioxidant activity was measured using the Trolox equivalent antioxidant capacity (TEAC) assay system. The tripeptides were divided into two data sets: a training set comprising 50 compounds and a validated set comprising five compounds. The structure‐activity relationship of the training set was then analyzed using classical quantitative structure‐activity relationship (QSAR) analysis. The study findings demonstrate that the presence of a cysteine residue at any position, an aromatic amino acid at the C‐terminus, higher hydrophobicity of the N‐terminal residue, and smaller HOMO‐LUMO energy gap of the middle residue can significantly enhance the antioxidant activity. The activities of the five validated compounds were predicted using the constructed QSAR model, and a good correlation between measured and predicted activities was observed. The information obtained from the QSAR model could be useful for effective production of antioxidant peptides from food proteins such as egg white proteins.

中文翻译:

定量分析三肽的结构与抗氧化活性之间的关系。

来自食物蛋白质酶解产物的肽表现出显着的抗氧化活性。几项研究试图确定促成肽抗氧化活性的因素。然而,尚不清楚肽的抗氧化剂活性的理化性质和因素。在这项研究中,为了根据成分氨基酸的性质来阐明对肽的抗氧化活性重要的因素,由20种天然氨基酸合成了55种三肽,并使用Trolox等效抗氧化能力(TEAC)测定系统测量了它们的抗氧化活性。 。三肽被分为两个数据集:包含50种化合物的训练集和包含5种化合物的验证集。然后使用经典的定量结构-活动关系(QSAR)分析来分析训练集的结构-活动关系。研究结果表明,在任何位置均存在半胱氨酸残基,在C末端存在芳族氨基酸,N末端残基的疏水性较高,中间残基的HOMO-LUMO能隙较小,可以显着增强抗氧化性活动。使用构建的QSAR模型预测了五个经过验证的化合物的活性,并且观察到了所测活性与预测活性之间的良好相关性。从QSAR模型获得的信息可用于从食物蛋白(例如蛋清蛋白)有效生产抗氧化肽。研究结果表明,在任何位置均存在半胱氨酸残基,在C末端存在芳族氨基酸,N末端残基的疏水性较高,中间残基的HOMO-LUMO能隙较小,可以显着增强抗氧化性活动。使用构建的QSAR模型预测了五个经过验证的化合物的活性,并且观察到了所测活性与预测活性之间的良好相关性。从QSAR模型获得的信息可用于从食物蛋白(例如蛋清蛋白)有效生产抗氧化肽。研究结果表明,在任何位置均存在半胱氨酸残基,在C末端存在芳族氨基酸,N末端残基的疏水性较高,中间残基的HOMO-LUMO能隙较小,可以显着增强抗氧化性活动。使用构建的QSAR模型预测了五个经过验证的化合物的活性,并且观察到了所测活性与预测活性之间的良好相关性。从QSAR模型获得的信息可用于从食物蛋白(例如蛋清蛋白)有效生产抗氧化肽。中间残基的HOMO-LUMO能隙较小,可以显着增强抗氧化活性。使用构建的QSAR模型预测了五个经过验证的化合物的活性,并且观察到了所测活性与预测活性之间的良好相关性。从QSAR模型获得的信息可用于从食物蛋白(例如蛋清蛋白)有效生产抗氧化肽。中间残基的HOMO-LUMO能隙较小,可以显着增强抗氧化活性。使用构建的QSAR模型预测了五个经过验证的化合物的活性,并且观察到了所测活性与预测活性之间的良好相关性。从QSAR模型获得的信息可用于从食物蛋白(例如蛋清蛋白)有效生产抗氧化肽。
更新日期:2020-01-12
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