Prioritization of compounds using inverse docking approach is limited owing to potential drawbacks in its scoring functions. Classically, molecules ranked by best or lowest binding energies and clustering methods have been considered as probable hits. Mining probable hits from an inverse docking approach is very complicated given the closely related protein targets and the chemically similar ligand data set. To overcome this problem, we present here a computational approach using receptor-centric and ligand-centric methods to infer the reliability of the inverse docking approach and to recognize probable hits. This knowledge-driven approach takes advantage of experimentally identified inhibitors against a particular protein target of interest to delineate shape and molecular field properties and use a multilayer perceptron model to predict the biological activity of the test molecules. The approach was validated using flavone derivatives possessing inhibitory activities against principal antimalarial molecular targets of fatty acid biosynthetic pathway, FabG, FabI and FabZ, respectively. We propose that probable hits can be retrieved by comparing the rank list of docking, quantitative-structure activity relationship and multilayer perceptron models.
Inhibitor design associated with the dynamics of dengue envelope protein at pre-fusion stage is a prominent strategy to interfere fusion transition of dengue virus with the host cell membrane. Receptor-guided de novo inhibitors were designed based on the knowledge of co-crystallized detergent, β-octyl glucoside. Pharmacophore features distribution showed the preference of aromatic groups with H bonding features connected to aliphatic bulky group as the skeleton for inhibitor design. Molecular dynamic simulations revealed (2R)-2-[(6-amino-1-oxohexan-2-yl)amino]-4-[6-(4-phenylpiperidine-1-yl)-1,2-benzoxazol-3-yl]butanoate as the probable binder which developed extensive conservative interactions despite the local pocket residues movements especially from kl β-hairpin, the key structural unit for initiating conformational changes required for fusion transition. The electronic and hydrophobic potentials also indicated that butanoate molecule as the initial lead for envelope protein inhibitors.
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