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Protein AG-gold complex: an alternative probe in immunocytochemistry
L Ghitescu1, Z Galis, M Bendayan
1Département d'Anatomie, Université de Montréal, Québec, Canada.
Summary
Protein AG-gold conjugates offer a versatile tool for immunocytochemical and immunoblot assays. This reagent effectively detects various antibodies, providing a reliable alternative for scientific research.
Area of Science:
- Biochemistry
- Immunology
- Cell Biology
Background:
- Protein A and Protein G are commonly used reagents in immunochemical techniques.
- A novel recombinant protein, Protein AG, combines the binding properties of both Protein A and Protein G.
- Protein AG exhibits immunoglobulin Fc binding sites, making it suitable for antibody detection.
Purpose of the Study:
- To assess the efficacy of Protein AG conjugated with colloidal gold as an immunocytochemical reagent.
- To evaluate the reliability and versatility of Protein AG-gold conjugates in various immunoassays.
Main Methods:
- Protein AG was adsorbed onto 10-nm colloidal gold particles.
- The resulting Protein AG-gold conjugates were used as secondary reagents in post-embedding immunocytochemical assays.
- The reagent's performance was also tested in immunoblot analysis for detecting nitrocellulose-immobilized IgGs.
Main Results:
- Protein AG-gold conjugates produced positive signals in immunocytochemical assays with diverse polyclonal and monoclonal antibodies.
- The reagent demonstrated effectiveness in immunoblot analysis, binding various immobilized IgGs.
- The binding affinity of Protein AG to gold particles was found to be saturable, with up to 12 molecules per particle.
Conclusions:
- Protein AG-gold conjugates serve as a versatile and convenient probe for both immunochemical and immunocytochemical studies.
- The combined specificity of Protein A and Protein G in Protein AG broadens its application range.
- This reagent represents a valuable alternative for antibody detection and analysis in scientific research.