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Fluorescein labeling of Fab' while preserving single thiol
G P Der-Balian1, N Kameda, G L Rowley
1Sclavo Inc. West Coast, Sunnyvale, California 94089.
Analytical Biochemistry
|August 15, 1988
Summary
Researchers optimized fluorescein isothiocyanate labeling of rabbit Fab' fragments. This method achieves high fluorescence intensity while preserving thiol integrity for antibody research.
Area of Science:
- Biochemistry
- Immunology
- Protein Chemistry
Background:
- Antibody fragments like Fab' are crucial in diagnostics and therapeutics.
- Efficient labeling of Fab' with fluorescent tags is essential for various biological assays.
- Maintaining the structural integrity of the Fab' thiol residue during labeling is critical for its function.
Purpose of the Study:
- To establish optimal conditions for fluorescein isothiocyanate (FITC) labeling of rabbit Fab eparations.
- To maximize fluorescence intensity of labeled Fab eparations.
- To ensure the preservation of the integrity of the single thiol residue in rabbit Fab eparations.
Main Methods:
- Incubation of rabbit Fab eparations with fluorescein isothiocyanate (FITC).
- Optimization of reaction parameters including time, temperature, and pH.
- Assessment of fluorescence intensity and thiol residue integrity using spectrophotometric and chemical methods.
Main Results:
- Reproducible labeling of rabbit Fab eparations with two fluorescein moieties was achieved within 30 minutes at room temperature and pH 8.9.
- High fluorescence intensity was obtained.
- The integrity of more than half of the existing thiol residues was preserved.
Conclusions:
- Optimal conditions for FITC labeling of rabbit Fab eparations were determined.
- The developed method provides a balance between high fluorescence signal and Fab eparation integrity.
- This optimized labeling protocol is suitable for applications requiring sensitive detection while maintaining antibody functionality.