QSAR Studies on the Bioactivity of Plasmodium falciparum Glucose-6- Phosphate Dehydrogenase Inhibitors

Abstract

Plasmodium falciparum glucose-6-phosphate dehydrogenase (PfG6PD) has been taken as a promising target for developing anti-malarial drugs. In this work, four quantitative models were generated to predict the bioactivity of 262 Pf G6PD inhibitors. Each molecule was represented by ADRIANA. Code descriptors. The whole dataset was divided into a training set and a test set randomly or by a Kohonen’s self-organizing map (SOM). Afterwards, the bioactivities of Pf G6PD inhibitors were predicted with Multiple Linear Regression (MLR) and Support Vector Machine (SVM) method, respectively. All the four models gave a correlation coefficient (r) over 0.82 and a RMSE under 0.18 on test set. By analyzing the descriptors in these models, it was observed that number of hydrogen bonding acceptors, ring complexity, σ atom charges, total atom charges and effective atom polarizabilitly properties are important for the bioactivity of Pf G6PD inhibitors. Keywords: Plasmodium falciparum glucose-6-phosphate dehydrogenase (PfG6PD) inhibitor, kohonen’s self-organizing map (SOM), multiple linear regression (MLR), support vector machine (SVM), quantitative structure-activity relationship (QSAR).