ABSTRACT
Computational methods like neural network and genetic algorithm can be used to speed up the drug discovery process. Machine learning method like artificial neural networks is widely used in pharmaceutical industry. ANNs have some advantages over classical statistical methods because they can investigate complex, nonlinear relationships. sequence alignment, variable selection in quantitative structure activity relationship (QSAR) studies. Chemical and biological activity of a drug is closely related to its properties known as descriptors. The goal is to find a model which will correlate the inputs (properties) with a target (biological activity). The methodology is known as Quantitative Structure-Activity / Property Relationship (QSAR/QSPR). QSAR/QSPR correlates topological, electronic and quantum properties of compounds with their biological activities. Virtual Screening (VS) method “screen” compounds with known chemical motifs called “pharmacophores” amid millions of other compounds in a data base. These screened compounds are potential drugs and can be tested experimentally for their biological activities. The ANN technology is used to study interactions and dynamics between compounds and receptor proteins or nucleic acids in the area of pharmacokinetics and pharmacodynamics. Some more applications of ANN are: data analysis, comparison/ classification of drug libraries, study of HIV-1 reverse transcriptase, gene prediction and homology searches in protein. Comparative molecular surface analysis (COMSA), a 3D QSAR method uses ANN to map the mean electrostatic potential on the molecular surface. Genetic algorithms (GAs) are stochastic optimization methods. A QSAR model can be made by variable selection, PLS (partial least squares) and cross validation using GA. Pharmacophore modelling is done by comparing some important electronic and 3D structural features required for a potent group of ligands/drugs when the receptor or target is unknown. This article discusses immense application of ANNs and GAs in the drug discovery process. The future prospect of Artificial Intelligence in drug and vaccine design, COVID-19 management and prediction are also discussed.
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