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QESAR study tripeptide analogues as antioxidation agents

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A database consisting of 23 tripeptides was used to study the quantitative relationships between electric surface potential descriptors and antioxidant activity QESARs. The important structural descriptors SaaNH_acnt, SsOH_acnt, SaaN, SaaN_acnt, SsssCH, SaaaC, SsNH3p, SdO, SdO_acnt were selected for constructing the linear models QESARs with genetic algorithm. The best 4-variable linear model QESARlinear including the structural descriptors SaaN, SdO, SdO_acnt and SsOH_acnt was constructed. The quality QESARlinear was exhibited in statistical values R2 fitness of 97.5660, standard error of estimation SE of 0.0378, F-stat of 130.2731, R2 test of 93.3851. The non-linear model as neural network model QESARneural I(4)-HL(3)-O(1) with R2 fitness of 98.2296 was built by using structural descriptors in QESARlinear model. The antioxidation activities of tripeptides resulting from QESARlinear and QESARneural model were pointed out in values MARE, % of 27.4282 and 20.0672, respectively. | QESAR study tripeptide analogues as antioxidation agents Tạp chí Đại học Thủ Dầu Một, số 3(5) – 2012 QESAR STUDY OF TRIPEPTIDE ANALOGUES AS ANTIOXIDATION AGENTS Nong Thi Hong Duyen(1) – Pham Van Tat(2) (1) Hue University of Science; (2) Thu Dau Mot University ABSTRACT A database consisting of 23 tripeptides was used to study the quantitative relationships between electric surface potential descriptors and antioxidant activity QESARs. The important structural descriptors SaaNH_acnt, SsOH_acnt, SaaN, SaaN_acnt, SsssCH, SaaaC, SsNH3p, SdO, SdO_acnt were selected for constructing the linear models QESARs with genetic algorithm. The best 4-variable linear model QESARlinear including the structural descriptors SaaN, SdO, SdO_acnt and SsOH_acnt was constructed. The quality QESARlinear was exhibited in statistical values R2fitness of 97.5660, standard error of estimation SE of 0.0378, F-stat of 130.2731, R2test of 93.3851. The non-linear model as neural network model QESARneural I(4)-HL(3)-O(1) with R2fitness of 98.2296 was built by using structural descriptors in QESARlinear model. The antioxidation activities of tripeptides resulting from QESARlinear and QESARneural model were pointed out in values MARE, % of 27.4282 and 20.0672, respectively. Keywords: QESARs model, multiple regression, neural network and antioxidation tripeptides * 1. Introduction xidation activities QESAR may indicate The antioxidation compounds prevent quantitatively change of biological activity the biological and chemical substances from or physicochemical properties corres- radical-induced oxidation damage [4]. The ponding to composition of amino acids in hydrolysis from various proteins, such as peptide chain [2], [3]. soybean, casein, bullfrog, royal jelly, venison, This work reports the use of r-lactalbumin, myofibrillar, rice endosperm, multivariate regression and neuro-fuzzy have been shown to have antioxidant technique with genetic .