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Exploration of multiple Sortase A protein conformations in virtual screening
Chunxia Gao1, Ivana Uzelac1, Johan Gottfries1
1Department of Chemistry and Molecular Biology, University of Gothenburg, 405 30 Göteborg, Sweden.
Scientific Reports
|February 6, 2016
Summary
New research explores inhibiting Methicillin-resistant Staphylococcus aureus (MRSA) by targeting the S. aureus Sortase A (SrtA) enzyme. Understanding protein flexibility and binding modes is key to developing effective antivirulence agents against resistant bacterial strains.
Area of Science:
- Microbiology
- Biochemistry
- Computational Chemistry
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant global health challenge, necessitating novel therapeutic strategies.
- The bacterial enzyme S. aureus Sortase A (SrtA) is crucial for bacterial adherence, making it a promising target for antivirulence therapies, including against resistant strains.
Purpose of the Study:
- To investigate the impact of protein structural flexibility on virtual screening performance for SrtA inhibitors.
- To explore the binding modes of small molecules to SrtA using diverse receptor structures.
Main Methods:
- Employed molecular dynamics simulations (regular and steered) to generate 100 SrtA structures from four distinct crystal/NMR templates.
- Performed virtual screening using 10 known binders and 500 decoys against the generated SrtA structures.
Main Results:
- Identified a correlation between SrtA protein structural flexibility and virtual screening success.
- Confirmed the immobilization of the β6/β7 loop upon substrate binding.
- Observed that NMR-derived SrtA structures showed slightly better screening performance than X-ray crystal structures.
Conclusions:
- Protein structural flexibility significantly influences the efficacy of virtual screening for SrtA inhibitors.
- Binding modes of inhibitors are highly dynamic and may not always involve the catalytic site, suggesting alternative binding pockets.
- Further research is needed to fully elucidate the complex binding interactions of SrtA inhibitors.
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