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Updated: Jul 6, 2025
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Development of Oxadiazolone Activity-Based Probes Targeting FphE for Specific Detection of S. aureus Infections
Jeyun Jo1, Tulsi Upadhyay1, Emily C Woods1
1Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA.
Abstract:
Staphylococcus aureus is a major human pathogen responsible for a wide range of systemic infections. Since its propensity to form biofilms in vivo poses formidable challenges for both detection and treatment, tools that can be used to specifically image S. aureus biofilms are highly valuable for clinical management. Here we describe the development of oxadiazolonebased activity-based probes to target the S. aureus-specific serine hydrolase FphE. Because this enzyme lacks homologs in other bacteria, it is an ideal target for selective imaging of S. aureus infections. Using X-ray crystallography, direct cell labeling and mouse models of infection we demonstrate that oxadiazolone-based probes enable specific labeling of S. aureus bacteria through the direct covalent modification of the FphE active site serine. These results demonstrate the utility of the oxadizolone electrophile for activity-based probes (ABPs) and validate FphE as a target for development of imaging contrast agents for the rapid detection of S. aureus infections.
Insights
Researchers developed novel oxadiazolone-based probes to specifically image Staphylococcus aureus infections. These probes target the FphE enzyme, enabling precise detection of S. aureus biofilms for improved clinical management.
Area of Science:
- Microbiology
- Biochemistry
- Medical Imaging
Background:
- Staphylococcus aureus is a significant human pathogen causing diverse systemic infections.
- The formation of Staphylococcus aureus biofilms in vivo presents major challenges for diagnosis and treatment.
- Targeted imaging tools for S. aureus biofilms are crucial for effective clinical management.
Approach:
- Development of oxadiazolone-based activity-based probes (ABPs) targeting the Staphylococcus aureus-specific serine hydrolase FphE.
- Utilizing X-ray crystallography to elucidate enzyme structure and probe interaction.
- Employing direct cell labeling and in vivo mouse models to validate probe specificity and efficacy.
Key Points:
- The FphE enzyme is unique to S. aureus, making it an ideal target for selective imaging.
- Oxadiazolone probes covalently modify the FphE active site serine, enabling specific bacterial labeling.
- Demonstrated successful labeling of S. aureus bacteria in both in vitro and in vivo settings.
Conclusions:
- Oxadiazolone-based probes are effective for the specific activity-based labeling of Staphylococcus aureus.
- The FphE enzyme is a validated target for developing novel imaging agents.
- These findings support the advancement of rapid detection methods for S. aureus infections.
