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CoMFA and CoMSIA Analysis on the Fungicidal Activity against Damping-off (Pythium ultimum) with N-phenylbenzenesulfonamide Analogues  

Jang, Seok-Chan (Division of Applied Biology and Chemistry, College of Agriculture and Life Sciences, Chungnam National University)
Kang, Kyu-Young (Division of Applied Life Science, Gyeongsang National University)
Sung, Nack-Do (Division of Applied Biology and Chemistry, College of Agriculture and Life Sciences, Chungnam National University)
Publication Information
The Korean Journal of Pesticide Science / v.11, no.1, 2007 , pp. 8-17 More about this Journal
Abstract
Three-dimensional quantitative structure-activity relationships (3D-QSARs) on the fungicidal activity against damping-off (Pythium ultimum) with N-phenylbenzenesulfonamide and N-phenyl-2-thienylsulfonamide analogues (1-34) were studied quantitatively using CoMFA (comparative molecular field analysis) and CoMSIA (comparative molecular similarity indeces analysis) methodologies. On the whole, the statistical qualities of CoMSIA models with field fit alignment (FF1-FF5) were slightly higher than that of atom based fit alignment (AF1-AF5) but, the deviations of statistical quality between two alignments in case of CoMFA models were slightly lower. The statistical results of CoMFA and CoMSIA model showed that the optimized CoMSIA model (FF1: $r_{cv.}^2\;(q^2)=0.674$ & $r_{ncv.}^2=0.964$) for damping-off is better predictability and fitness for fungicidal activities than CoMFA model (AF5: $r_{cv.}^2\;(q^2)=0.616$ & $r_{ncv.}^2=0.930$). The fungicidal activities according to the information of the CoMSIA (FF1) model were dependence upon the electrostatic and hydrophobic field of the N-phenylbenzene sulfonamide analogues. Therefore, from the results of graphical analyses on the contour maps with CoMSIA (FF3) model, it is expected that the characters of R4-substituent on the N-phenyl ring as hydrophobic and hydrogen bond acceptor will be contributed to the fungicidal activity against damping-off.
Keywords
CoMFA; CoMSIA; fungicidal activity; N-phenylbenzenesulfonamides; N-phenyl-2-thienylsulfonamides; damping-off (Pythium ultimum);
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