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Updated: Feb 2, 2026
Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
Published on: January 17, 2025
Combining molecular docking and molecular dynamics studies for modelling Staphylococcus aureus MurD inhibitory
1a Department of Pharmaceutical Chemistry , JSS College of Pharmacy, Tamil Nadu (A Constituent College of JSS Academy of Higher Education and Research, Mysuru) , India.
Abstract:
The ATP-dependent bacterial MurD enzyme catalyses the formation of the peptide bond between cytoplasmic intermediate UDP-N-acetylmuramoyl-L-alanine and D-glutamic acid. This is essential for bacterial cell wall peptidoglycan synthesis in both Gram-positive and Gram-negative bacteria. MurD is recognized as an important target for the development of new antibacterial agents. In the present study we prepared the 3D-stucture of the catalytic pocket of the Staphylococcus aureus MurD enzyme by homology modelling. Extra-precision docking, binding free energy calculation by the MM-GBSA approach and a 40 ns molecular dynamics (MD) simulation of 2-thioxothiazolidin-4-one based inhibitor $1 was carried out to elucidate its inhibition potential for the S. aureus MurD enzyme. Molecular docking results showed that Lys19, Gly147, Tyr148, Lys328, Thr330 and Phe431 residues are responsible for the inhibitor-protein complex stabilization. Binding free energy calculation revealed electrostatic solvation and van der Waals energy components as major contributors for the inhibitor binding. The inhibitor-modelled S. aureus protein complex had a stable conformation in response to the atomic flexibility and interaction, when subjected to MD simulation at 40 ns in aqueous solution. We designed some molecules as potent inhibitors of S. aureus MurD, and to validate the stability of the designed molecule D1-modelled protein complex we performed a 20 ns MD simulation. Results obtained from this study can be utilized for the design of potent S. aureus MurD inhibitors.
Insights
Researchers explored the Staphylococcus aureus MurD enzyme, a target for new antibiotics. Molecular modeling and simulations identified key interactions for designing effective MurD inhibitors to combat bacterial infections.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- The bacterial MurD enzyme is crucial for peptidoglycan synthesis, making it a vital target for novel antibacterial agents.
- Staphylococcus aureus MurD is essential for cell wall formation in both Gram-positive and Gram-negative bacteria.
Purpose of the Study:
- To investigate the inhibition potential of a 2-thioxothiazolidin-4-one based inhibitor against Staphylococcus aureus MurD.
- To elucidate the molecular interactions and stability of inhibitor-protein complexes using computational methods.
Main Methods:
- Homology modeling was used to generate the 3D structure of the S. aureus MurD catalytic pocket.
- Extra-precision molecular docking, MM-GBSA binding free energy calculations, and molecular dynamics (MD) simulations (40 ns and 20 ns) were performed.
- Key amino acid residues (Lys19, Gly147, Tyr148, Lys328, Thr330, Phe431) involved in inhibitor binding were identified.
Main Results:
- Molecular docking revealed specific residues crucial for stabilizing the inhibitor-protein complex.
- Binding free energy calculations indicated that electrostatic solvation and van der Waals forces are major contributors to inhibitor binding.
- Molecular dynamics simulations confirmed the stable conformation of the inhibitor-S. aureus MurD complex.
Conclusions:
- The study provides insights into the binding mechanism of 2-thioxothiazolidin-4-one based inhibitors with S. aureus MurD.
- Computational approaches successfully validated the stability of designed inhibitors.
- These findings can guide the rational design of potent S. aureus MurD inhibitors for developing new antibacterial therapies.
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