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The novel Mannich base benzimidazole derivative ( CB-1 ), 1-((1H-benzo[d]imidazol-1-yl)(3-chlorophenyl)methyl)-3-phenylurea) has been designed and synthesized by reacting benzimidazole, 3-chloro benzaldehyde, and N-Phenyl urea.  CB-1  has been characterized by UV- Visible, FTIR, and  1 H NMR.  CB-1  was explored to study the interaction with the most abundant blood protein which involved in the role of transport of molecules (drugs), human serum albumin (HSA). Fluorescence results are evident for the presence of both dynamic and static quenching mechanisms in the binding of  CB-1  to HSA. Antimicrobial screening were carried out against three bacteria and three fungi pathogens employing disc diffusion method. Molecular docking using AutoDock Vina tool further confirms the experimental binding interactions obtained from fluorescence. Density functional theory (DFT) with B3LYP/6-311G++ basis set was used for correlating theoretical data and obtaining optimized structures of  CB-1  along with reactants with molecular electrostatic potential (MEP) map and HOMO→LUMO energy gap calculation.HIGHLIGHTSThe novel Mannich base benzimidazole derivative ( CB-1 ) has been designed and synthesized by Mannich reaction.CB-1  has been characterized by UV- Visible, FTIR, and  1 H NMR.Fluorescence quenching reveals that HSA binds to CB-1 via aromatic residues, which is corroborated by molecular docking.Antifungal and antibacterial activity was evaluated in comparison to Nystatin and Gentamicin standard drugs, respectively.DFT calculations support experimental data and provide HOMO-LUMO energy gap. The novel Mannich base benzimidazole derivative ( CB-1 ) has been designed and synthesized by Mannich reaction. CB-1  has been characterized by UV- Visible, FTIR, and  1 H NMR. Fluorescence quenching reveals that HSA binds to CB-1 via aromatic residues, which is corroborated by molecular docking. Antifungal and antibacterial activity was evaluated in comparison to Nystatin and Gentamicin standard drugs, respectively. DFT calculations support experimental data and provide HOMO-LUMO energy gap. Communicated by Ramaswamy H. Sarma

journal of biomolecular structure and dynamics

Synthesis and characterization of a novel Mannich base benzimidazole derivative to explore interaction with human serum albumin and antimicrobial property: experimental and theoretical approach