title: The effects of characteristics of substituents on toxicity of the nitroaromatics: HiT QSAR study.
abstract: The present study applies the Hierarchical Technology for Quantitative Structure-Activity Relationships (HiT QSAR) for (i) evaluation of the influence of the characteristics of 28 nitroaromatic compounds (some of which belong to a widely known class of explosives) as to their toxicity; (ii) prediction of toxicity for new nitroaromatic derivatives; (iii) analysis of the effects of substituents in nitroaromatic compounds on their toxicity in vivo. The 50% lethal dose concentration for rats (LD50) was used to develop the QSAR models based on simplex representation of molecular structure. The preliminary 1D QSAR results show that even the information on the composition of molecules reveals the main tendencies of changes in toxicity. The statistic characteristics for partial least squares 2D QSAR models are quite satisfactory (R2 = 0.96-0.98; Q2 = 0.91-0.93; R2 (test) = 0.89-0.92), which allows us to carry out the prediction of activity for 41 novel compounds designed by the application of new combinations of substituents represented in the training set. The comprehensive analysis of toxicity changes as a function of substituent position and nature was carried out. Molecular fragments that promote and interfere with toxicity were defined on the basis of the obtained models. It was shown that the mutual influence of substituents in the benzene ring plays a crucial role regarding toxicity. The influence of different substituents on toxicity can be mediated via different C-H fragments of the aromatic ring.
authors.affiliation: Department of Chemistry, Computational Center for Molecular Structure and Interactions, Jackson State University, 1400 J.R. Lynch St, Jackson, MS 39217, USA.
authors.forename: Victor E
authors.initials: VE
authors.lastname: Kuz'min
authors.forename: Eugene N
authors.initials: EN
authors.lastname: Muratov
authors.forename: Anatoly G
authors.initials: AG
authors.lastname: Artemenko
authors.forename: Leonid
authors.initials: L
authors.lastname: Gorb
authors.forename: Mohammad
authors.initials: M
authors.lastname: Qasim
authors.forename: Jerzy
authors.initials: J
authors.lastname: Leszczynski
mesh_terms: D000818:Animals; D057927:Hydrophobic and Hydrophilic Interactions; D007536:Isomerism; D016018:Least-Squares Analysis; D007928:Lethal Dose 50; D008958:Models, Molecular; D015394:Molecular Structure; D009578:Nitrobenzenes / Q000737:chemistry* / Q000633:toxicity*; D021281:Quantitative Structure-Activity Relationship; D051381:Rats; D011919:Rats, Inbred Strains; D055672:Static Electricity
chemical_list: D009578:Nitrobenzenes