Abstract
A multivariate QSAR study of thirty-three 4,5-dihydroxypyrimidine carboxamides as HIV-1 integrase (HIV-1 IN) inhibitors was performed employing Ordered Predictors Selection (OPS) algorithm and PLS regression for variable selection and model construction, respectively. Four descriptors were chosen and a reasonable model ( n = 30; R 2 = 0.68; SEC = 0.57; PRESS cal = 8.72; F (2,27) = 28.97; Q 2 LOO = 0.58; SEV = 0.62; PRESS val = 11.62; R 2 pred = 0.87; SEP = 0.29; ARE pred = 4.37%; k = 0.99; k′ = 1.01; | r 2 0 − r 2 0′| = −0.18) was built with two latent variables (59.54% of the information). Leave- N-out (LNO) and Y-randomization methods confirmed the model robustness. The descriptors indicated that the HIV-1 IN inhibition depends on the electronic distribution of the investigated compounds. The interpretation of the model is related to the most accepted mechanism of action.
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