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Updated: Jun 8, 2025
Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
Published on: October 25, 2013
Discovery of potential natural therapeutics targeting cell wall biosynthesis in multidrug-resistant Enterococcus
Km Rakhi1, Monika Jain1, Amit Kumar Singh1
1Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, Greater Noida, India.
Background:
Identifying therapeutic inhibitors of crucial enzymes involved in the peptidoglycan biosynthesis pathway is pivotal for developing new treatments against multidrug-resistant Enterococcus faecalis V583. MurM, an essential enzyme in this pathway, plays a significant role in the bacterium's cell wall synthesis, making it an attractive druggable target for novel antimicrobial strategies. This study explored the potential of natural compounds as inhibitors of MurM, aiming to discover promising drug candidates that could serve as the foundation for future therapeutic development.
Methods:
The three-dimensional structure of MurM was predicted, optimized, and its binding pocket was analyzed by comparing it with related structures. Over 4,70,000 natural compounds from the COCONUT database were subjected to virtual high-throughput screening (vHTS). The top lead candidates were selected based on their Lipinski's profile, ADME profile, toxicity profile, estimated binding free energy (ΔG) and estimated inhibition constant (Ki). Interaction pattern analysis was used to evaluate the non-covalent interactions between the inhibitors and key residues in MurM's binding pocket. Molecular dynamics simulations were performed over 300 ns to assess the structural stability and impact of these inhibitors on MurM's enzyme.
Results:
Three lead compounds-CNP0056520, CNP0126952, and CNP0248480-were identified and prioritized with estimated ΔG ranging from - 9.35 to -7.9 kcal/mol. Molecular dynamics simulations revealed minimal impact on MurM's overall structure and dynamics, with the candidate inhibitors forming stable protein-ligand complexes. These interactions were supported by several non-covalent interactions between the candidate inhibitors and key residues within MurM's binding pocket.
Conclusion:
These findings suggest that the identified natural product candidates could serve as promising inhibitors of MurM, potentially leading to novel therapeutics targeting cell wall biosynthesis in multidrug-resistant E. faecalis.
Insights
Natural compounds were screened to find inhibitors of MurM, an enzyme crucial for bacterial cell wall synthesis. Three promising candidates were identified, offering potential new treatments for multidrug-resistant Enterococcus faecalis.
Area of Science:
- Microbiology
- Medicinal Chemistry
- Computational Biology
Background:
- Multidrug-resistant Enterococcus faecalis poses a significant threat, necessitating novel therapeutic strategies.
- The peptidoglycan biosynthesis pathway is essential for bacterial survival and a key target for antimicrobial development.
- MurM, an enzyme in this pathway, is a druggable target for combating resistant bacterial infections.
Purpose of the Study:
- To identify natural compounds that inhibit MurM, a critical enzyme in E. faecalis cell wall synthesis.
- To discover potential drug candidates for developing new treatments against multidrug-resistant strains.
- To explore natural products as a source for novel antimicrobial agents.
Main Methods:
- 3D structure prediction and binding pocket analysis of MurM.
- Virtual high-throughput screening of over 470,000 natural compounds from the COCONUT database.
- Selection of lead candidates based on ADMET properties, binding energy (ΔG), and inhibition constant (Ki).
- Molecular dynamics simulations to assess inhibitor-enzyme complex stability and interactions.
Main Results:
- Three lead natural compounds (CNP0056520, CNP0126952, CNP0248480) were identified with strong binding affinities (ΔG: -7.9 to -9.35 kcal/mol).
- Molecular dynamics simulations confirmed stable protein-ligand complexes with minimal impact on MurM's overall structure.
- Key non-covalent interactions between inhibitors and MurM's active site residues were elucidated.
Conclusions:
- The identified natural compounds show promise as MurM inhibitors.
- These compounds could form the basis for novel therapeutics targeting E. faecalis cell wall biosynthesis.
- This study highlights the potential of natural products in combating multidrug-resistant bacterial infections.
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