Computational Analysis on Molecular Stability and Binding Affinity of 3-(Aminothiazolyl)Quinolone Derivative as Multitargeting Antibacterial Agents through Ab Initio Methods and Molecular Docking

The present study deals with the application of ab initio method using density functional theory (DFT) at M06-2X/6-311++G(d,p) to characterize the considered molecule completely. Though the anti-bacterial activity of the 3-(amino thiazolyl)quinolone derivatives was studied, the effects of intermolecular hydrogen bonding on chemical and biological processes remain unexplored or have not been thoroughly investigated so far. Investigations into non-covalent interactions were carried out using the reduced density gradient methodology and the quantum theory of atoms in molecules. An electron localization function was used to investigate the electronic vicinity of each atom in a molecule. Natural bond orbital analysis was used to determine the correlated stabilization energies for the intermolecular hydrogen bonds (H-bonds) that are responsible for the molecular stability of the dimer structure. The electrophilic and nucleophilic sites were predicted using the molecular electrostatic potential. The density of states and partial density of states were also used to represent the frontier molecular orbitals. The inhibitory activities of the compound with different classes of bacteria were also investigated using molecular docking simulation.