Related Experiment Video
Updated: Sep 23, 2025
Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis
Published on: June 20, 2025
Methicillin-Resistant Staphylococcus aureus: Docking-Based Virtual Screening and Molecular Dynamics Simulations to
Motahareh Masumi1, Fatemeh Noormohammadi1, Fatemeh Kianisaba1
1Students Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran.
Abstract:
Staphylococcus aureus (S. aureus) is responsible for several disorders including skin and soft tissue infections, bacteremia, pulmonary infections, septic arthritis, osteomyelitis, meningitis, gastroenteritis, toxic-shock syndrome, and urinary tract infections. Methicillin-resistant S. aureus (MRSA) contains penicillin-binding protein 2a (SauPBP2a) responsible for catalyzing the peptidoglycan production within the bacterial cell wall. The binding affinity of SauPBP2a to beta-lactam antibiotics is low, and thus, it is necessary to discover new effective SauPBP2a inhibitors to combat mortality and morbidity in patients affected by MRSA. The binding affinity of 46 natural flavonoids to the SauPBP2a active site was examined via molecular docking analysis. The stability of docked poses associated with the top-ranked flavonoids was tested by performing molecular dynamics (MD) in 10 nanoseconds (ns) computer simulations. Kaempferol 3-rutinoside-7-sophoroside and rutin demonstrated a considerable binding affinity to the SauPBP2a active site (ΔG binding < -11 kcal/mol). Their docked poses were found to be stable for 10 ns MD simulations. Kaempferol 3-rutinoside-7-sophoroside and rutin also exhibited salient binding affinity to the enzyme's allosteric site. This study suggests that kaempferol 3-rutinoside-7-sophoroside and rutin may be considered as drug candidates for therapeutic aims in several human infections associated with MRSA. Nevertheless, in vitro and in vivo confirmations are warranted.
Insights
New natural compounds, kaempferol 3-rutinoside-7-sophoroside and rutin, show promise as inhibitors for Methicillin-resistant Staphylococcus aureus (MRSA). These compounds bind effectively to the SauPBP2a enzyme, offering potential new treatments for MRSA infections.
Area of Science:
- Biochemistry
- Pharmacology
- Computational Chemistry
Background:
- Staphylococcus aureus (S. aureus) causes numerous human infections.
- Methicillin-resistant S. aureus (MRSA) poses a significant health threat due to antibiotic resistance.
- The enzyme SauPBP2a is crucial for MRSA cell wall synthesis and a target for new antibiotics.
Purpose of the Study:
- To identify natural compounds that can inhibit the MRSA enzyme SauPBP2a.
- To evaluate the binding affinity and stability of natural flavonoids against SauPBP2a.
Main Methods:
- Molecular docking analysis of 46 natural flavonoids against the SauPBP2a active site.
- Molecular dynamics (MD) simulations of 10 nanoseconds (ns) to assess the stability of docked poses.
- Evaluation of binding affinity to both active and allosteric sites of SauPBP2a.
Main Results:
- Kaempferol 3-rutinoside-7-sophoroside and rutin exhibited strong binding affinity to the SauPBP2a active site (ΔGbinding < -11 kcal/mol).
- The docked poses of these two flavonoids remained stable during 10 ns MD simulations.
- Both compounds also showed significant binding affinity to the enzyme's allosteric site.
Conclusions:
- Kaempferol 3-rutinoside-7-sophoroside and rutin are potential drug candidates for treating MRSA infections.
- Further in vitro and in vivo studies are necessary to validate their therapeutic efficacy.
