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A ligand-receptor binding assay by receptor immobilization
1Division of Biochemical Genetics, Meiji Institute of Health Science, Kanagawa, Japan.
Analytical Biochemistry
|April 1, 1988
Summary
Researchers developed a simple assay for solubilized transferrin receptor (TfR) using immobilized TfR on beads. This method accurately measures transferrin binding, offering a new tool for receptor studies.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Ligand-receptor interactions are fundamental in cellular processes.
- Studying solubilized receptors presents challenges for binding assays.
- Transferrin receptor (TfR) plays a crucial role in iron uptake.
Purpose of the Study:
- To develop a novel and straightforward binding assay for solubilized transferrin receptor.
- To validate the assay's ability to quantify transferrin binding to its receptor.
Main Methods:
- Immobilization of solubilized membrane proteins containing TfR onto epoxide-functionalized beads.
- Covalent attachment of the receptor to the solid support.
- Quantification of 125I-labeled transferrin binding to immobilized TfR.
Main Results:
- Demonstrated dose-dependent, ligand-specific, and saturable binding of transferrin to immobilized TfR.
- Obtained a high affinity constant (Kd = 1.8 X 10(-9) M) via Scatchard analysis.
- Confirmed the reliability of the developed binding assay.
Conclusions:
- Immobilization of receptors onto beads provides a robust platform for binding assays.
- This method simplifies the study of solubilized transferrin receptor interactions.
- The assay is suitable for determining ligand-receptor binding affinities.