Synthesis and molecular docking study of α-aminophosphonates as potential multi-targeting antibacterial agents

J Hazard Mater. 2024 Mar 5:465:133203. doi: 10.1016/j.jhazmat.2023.133203. Epub 2023 Dec 12.

Abstract

Antibacterial compounds that reduce extracellular polymeric substances (EPS) are needed to avoid bacterial biofilms in water pipelines. Herein, green one-pot synthesis of α-aminophosphonates (α-Amps) [A-G] was achieved by using ionic liquid (IL) as a Lewis acid catalyst. The synthesized α-Amp analogues were tested against different bacteria such as Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa. The representative [B] analogue showed an efficient antibacterial effect with MIC values of 3.13 μg/mL for E. coli, P. aeruginosa, and 6.25 μg/mL for B. subtilis. Additionally, a strong ability to eliminate the mature bacterial biofilm, with super-MIC values of 12.5 μg/mL for E. coli, P. aeruginosa, and 25 μg/mL for B. subtilis. Moreover, bacterial cell disruption by ROS formation was also tested, and the compound [B] revealed the highest ROS level compared to other compounds and the control, and efficiently destroyed the extracellular polymeric substances (EPS). The docking study confirmed strong interactions between [B] analogue and protein structures with a binding affinity of -6.65 kCal/mol for the lyase protein of gram-positive bacteria and -6.46 kCal/mol for DNA gyrase of gram-negative bacteria. The results showed that α-Amps moiety is a promising candidate for developing novel antibacterial and anti-biofilm agents for clean water supply.

Keywords: Aminophosphonates; Anti-bacterial; Anti-biofilm; Bacteria; Docking study.

MeSH terms

  • Anti-Bacterial Agents* / chemistry
  • Bacteria
  • Biofilms
  • Escherichia coli*
  • Microbial Sensitivity Tests
  • Molecular Docking Simulation
  • Reactive Oxygen Species

Substances

  • Anti-Bacterial Agents
  • Reactive Oxygen Species