A single-stranded DNA aptamer that selectively binds to Staphylococcus aureus enterotoxin B.

Area of Science:

• Microbiology
• Biotechnology
• Food Science

Background:

• Staphylococcus aureus is a foodborne pathogen producing staphylococcal enterotoxins (SEs) that cause food poisoning.
• Current immuno-affinity assays for SE detection are limited, costly, and do not cover all toxin types.
• Antibody development for these assays is complex and expensive.

Purpose of the Study:

• To develop a novel aptamer for detecting staphylococcal enterotoxin B (SEB).
• To establish a cost-effective and broadly applicable alternative to antibody-based SE detection methods.
• To lay the groundwork for comprehensive aptamer-based detection of all SEs.

Main Methods:

• In vitro selection of aptamers against SEB.
• Testing the aptamer's specificity and affinity for SEB in complex mixtures.
• Evaluating the aptamer as a tool for SE detection assays.

Main Results:

• A novel aptamer, APT(SEB1), was successfully selected for high-affinity binding to SEB.
• APT(SEB1) demonstrated high specificity, isolating SEB from a mixture of other SEs.
• The aptamer shows potential for replacing antibodies in SE detection.

Conclusions:

• Aptamers offer a promising, cost-effective alternative to antibodies for detecting staphylococcal enterotoxins.
• This study provides a foundation for developing comprehensive aptamer-based assays for all SEs.
• The developed aptamer is crucial for enhancing food safety and epidemiological surveillance of S. aureus contamination.