Energy landscape of the domain movement in Staphylococcus aureus UDP-Nacetylglucosamine 2-epimerase
| Autor: | Alessandro S. Nascimento, Erika Chang de Azevedo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Staphylococcus aureus
Protein Conformation BACTÉRIAS Molecular Dynamics Simulation Ligands medicine.disease_cause Uridine Diphosphate 03 medical and health sciences Molecular dynamics chemistry.chemical_compound Protein Domains Biosynthesis Cell Wall Structural Biology Catalytic Domain Drug Resistance Bacterial medicine Humans Amino Acid Sequence Amino Acids 030304 developmental biology chemistry.chemical_classification Glucosamine 0303 health sciences Teichoic acid biology 030302 biochemistry & molecular biology Active site Energy landscape Staphylococcal Infections Amino acid Teichoic Acids carbohydrates (lipids) Enzyme Biochemistry chemistry biology.protein Carbohydrate Epimerases Energy Metabolism |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP |
| Popis: | Staphylococcus aureus is an important cause of resistant healthcare-associated infections. It has been shown that the Wall Teichoic Acid (WTA) may be an important drug target acting on antibiotic-resistant cells. The UDP-N-Acetylglucosamine 2-epimerase, MnaA, is one of the first enzymes on the pathway for the biosynthesis of the WTA. Here, detailed molecular dynamics simulations of S. aureus MnaA were used to characterize the conformational changes that occur in the presence of UDP and UDP-GlcNac and also the energetic landscape associated with these changes. Using different simulation techniques, such as ABMD and GAMD, it was possible to assess the energetic profile for the protein with and without ligands in its active site. We found that there is a dynamic energy landscape that has its minimum changed by the presence of the ligands, with a closed structure of the enzyme being more frequently observed for the bound state while the unbound enzyme favors an opened conformation. Further structural analysis indicated that positively charged amino acids associated with UDP and UDP-GlcNac interactions play a major role in the enzyme opening movement. Finally, the energy landscape profiled in this work provides important conclusions for the design of inhibitor candidates targeting S. aureus MnaA. |
| Databáze: | OpenAIRE |
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