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An Electronic‐structure Informatics Study on the Toxicity of Alkylphenols to Tetrahymena pyriformis
Author(s) -
Sugimoto Manabu,
Manggara Algafari Bakti,
Yoshida Kazuki,
Inoue Takafumi,
Ideo Toshihiro
Publication year - 2020
Publication title -
molecular informatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.481
H-Index - 68
eISSN - 1868-1751
pISSN - 1868-1743
DOI - 10.1002/minf.201900121
Subject(s) - tetrahymena pyriformis , quantitative structure–activity relationship , molecule , linear regression , chemistry , biological system , regression analysis , molecular descriptor , computational chemistry , mathematics , stereochemistry , tetrahymena , statistics , biology , organic chemistry , biochemistry
Alkylphenols (APs) dissolved in water are known to be toxic to animals including humans. In this study, regression models describing the toxicity of the 33 AP molecules were investigated for reproducing and thereby making it possible to predict a quantitative structure‐activity relationship (QSAR). For this purpose, we tried to derive regression models for the experimental IGC 50 (growth inhibition concentration at 50 %) to Tetrahymena pyriformis by using various descriptor sets consisting of electronic and shape descriptors. By applying the multiple linear regression (MLR) analysis, it was successful to derive a quantitative regression model for the IGC 50 values. In this analysis, the size parameters of the molecules were found important, suggesting that bulky molecules should be less toxic. We could also obtain, when the size descriptors were excluded, an MLR model indicating that the electron affinity (EA) should be important, which is consistent with the previous QSAR studies. Through the correlation analysis among the descriptors, it was shown that, in the present set of molecules, EA and a size parameter are highly correlated. Since EA was calculated to be negative, indicating that the related process would be energetically unfavourable, it was concluded that the size of the molecules should be a dominant factor determining IGC 50 . This implies that a molecular recognition process would play a critical role in the mode of action for the toxicity.