Energy landscape of the domain movement in Staphylococcus aureus UDP-N-acetylglucosamine 2-epimerase

Autor(es)

de Azevedo, Erika Chang ^[1] ; Nascimento, Alessandro S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, Av Trabalhador Saocarlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Structural Biology; v. 207, n. 2, p. 158-168, AUG 1 2019.
• Citações Web of Science: 0

Resumo

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. (AU)

• Processo FAPESP: 15/13684-0 - Estudos estruturais e funcionais de enzimas que participam na síntese e degradação de carboidratos complexos
• Beneficiário: Igor Polikarpov
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/18173-0 - Mecanismos envolvidos em resistência a antibióticos: parede de ácidos teicóicos e biofilmes como alvos moleculares
• Beneficiário: Alessandro Silva Nascimento
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/26722-8 - Drug discovery contra doenças infecciosas humanos
• Beneficiário: Carsten Wrenger
• Linha de fomento: Auxílio à Pesquisa - Temático