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Modeling an Enzyme Active Site using Molecular Visualization Freeware
Published on: December 25, 2021
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Dynamic Modelling Reveals 'Hotspots' on the Pathway to Enzyme-Substrate Complex Formation.
Shane E Gordon1,2, Daniel K Weber2, Matthew T Downton2
1Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia.
Plos Computational Biology
|March 12, 2016
Summary
Dihydrodipicolinate synthase (DHDPS) is a bacterial enzyme and drug target. Molecular simulations reveal a conserved binding intermediate crucial for pyruvate entry, offering new avenues for antibacterial drug design.
Area of Science:
- Biochemistry
- Molecular Biology
- Drug Discovery
Background:
- Dihydrodipicolinate synthase (DHDPS) is essential for bacterial cell wall and protein synthesis.
- DHDPS is absent in humans, making it a promising antibacterial drug target.
- Previous drug design efforts for DHDPS inhibitors have been unsuccessful.
Purpose of the Study:
- To investigate the substrate binding mechanism of DHDPS from Staphylococcus aureus using advanced computational methods.
- To elucidate the role of conserved residues, particularly Arg140, in pyruvate binding.
- To identify potential targets for developing novel DHDPS inhibitors.
Main Methods:
- Molecular dynamics simulations
- Markov state models
- Umbrella sampling
- Analysis of enzyme-substrate interactions at atomistic detail
Main Results:
- Simulations successfully reproduced the crystallographic DHDPS-pyruvate complex.
- The conserved residue Arg140 plays a critical role in pyruvate's active site entry.
- A conserved, thermodynamically metastable binding intermediate involving Arg140 was identified.
- This intermediate is a conserved feature across different binding pathways.
Conclusions:
- The study provides atomistic insights into DHDPS-pyruvate interactions.
- Identified binding intermediates offer potential for designing more effective DHDPS inhibitors.
- Understanding dynamic protein-drug interactions can advance antibacterial drug discovery.
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