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Activity-based protein profiling of serine hydrolases and penicillin-binding proteins in Enterococcus faecium.
Grunnvåg, Jeanette S; Hegstad, Kristin; Lentz, Christian S.
Afiliação
  • Grunnvåg JS; Research Group for Host-Microbe Interactions, Department of Medical Biology, UiT - The Arctic University of Norway, Postboks 6050 Langnes, 9037 Tromsø, Norway.
  • Hegstad K; Centre for New Antibacterial Strategies (CANS), UiT - The Arctic University of Norway, Postboks 6050 Langnes, 9037 Tromsø, Norway.
  • Lentz CS; Research Group for Host-Microbe Interactions, Department of Medical Biology, UiT - The Arctic University of Norway, Postboks 6050 Langnes, 9037 Tromsø, Norway.
FEMS Microbes ; 5: xtae015, 2024.
Article em En | MEDLINE | ID: mdl-38813097
ABSTRACT
Enterococcus faecium is a gut commensal bacterium which is gaining increasing relevance as an opportunistic, nosocomial pathogen. Its high level of intrinsic and acquired antimicrobial resistance is causing a lack of treatment options, particularly for infections with vancomycin-resistant strains, and prioritizes the identification and functional validation of novel druggable targets. Here, we use activity-based protein profiling (ABPP), a chemoproteomics approach using functionalized covalent inhibitors, to detect active serine hydrolases across 11 E. faecium and Enterococcus lactis strains. Serine hydrolases are a big and diverse enzyme family, that includes known drug targets such as penicillin-binding proteins (PBPs), whereas other subfamilies are underexplored. Comparative gel-based ABPP using Bocillin-FL revealed strain- and growth condition-dependent variations in PBP activities. Profiling with the broadly serine hydrolase-reactive fluorescent probe fluorophosphonate-TMR showed a high similarity across E. faecium clade A1 strains, but higher variation across A2 and E. lactis strains. To identify these serine hydrolases, we used a biotinylated probe analog allowing for enrichment and identification via liquid chromatography-mass spectrometry. We identified 11 largely uncharacterized targets (α,ß-hydrolases, SGNH-hydrolases, phospholipases, and amidases, peptidases) that are druggable and accessible in live vancomycin-resistant E. faecium E745 and may possess vital functions that are to be characterized in future studies.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2024 Tipo de documento: Article