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Ligand binding assays with recombinant proteins refolded on an affinity matrix
1Department of Biochemistry, Temple University School of Medicine, Philadelphia, PA 19140.
Biotechniques
|September 1, 1994
Summary
This study presents a novel method for ligand binding assays using recombinant proteins. The technique immobilizes proteins on an affinity matrix, enabling functional studies in physiological conditions.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Chemistry
Context:
- Recombinant proteins often require denaturing agents for solubility but need physiological conditions for functional assays.
- Traditional ligand binding assays can be challenging with proteins that aggregate or precipitate in buffer.
- Affinity matrices are commonly used for protein purification and immobilization.
Purpose:
- To develop a robust procedure for ligand binding assays with difficult-to-handle recombinant proteins.
- To enable the study of protein-ligand interactions under near-native conditions.
- To provide a stable and accessible source of recombinant protein for functional characterization.
Summary:
- A method is described for coupling recombinant proteins, soluble only in denaturing agents, to an affinity matrix.
- The denaturing agent is replaced with a physiological buffer, immobilizing the protein while maintaining its structure.
- The immobilized protein is then used to quantify ligand binding using radiolabeled ligands and measuring bound radioactivity.
Impact:
- Facilitates the study of protein-ligand interactions for proteins previously difficult to assay.
- Enables accurate determination of binding affinities and kinetics.
- Expands the scope of functional protein analysis in drug discovery and basic research.