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Preparation of labeled staphylococcal enterotoxin A with high specific activity
Applied and Environmental Microbiology
|December 1, 1976
Summary
Labeling Staphylococcal enterotoxin A (SEA) with radioiodine can cause damage. For radioimmunoassay, the descending part of the protein peak yields the most antigenically active labeled SEA.
Area of Science:
- Immunochemistry
- Microbiology
Background:
- Staphylococcal enterotoxin A (SEA) is a potent toxin.
- Radioiodine labeling is crucial for diagnostic assays.
Purpose of the Study:
- To investigate the impact of radioiodine labeling on SEA's antigenic activity.
- To identify optimal labeling and purification methods for SEA radioimmunoassay.
Main Methods:
- Chloramine-T method for 125I and 131I labeling of SEA.
- Gel chromatography for fractionation of labeled SEA.
- Crossed immunoelectrophoresis to assess antigenic activity.
Main Results:
- Radioiodine labeling and storage caused SEA damage and aggregation.
- Ascending fractions of the labeled SEA peak contained inactive components.
- 131I-labeled SEA showed faster antigenic activity loss than 125I-labeled SEA during storage.
- Greatest radioiodine release occurred in the ascending protein peak fractions.
Conclusions:
- The descending part of the protein peak from gel chromatography provides the most suitable labeled SEA for radioimmunoassay.
- Careful fractionation is essential to preserve the antigenic integrity of labeled SEA.