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Updated: Aug 7, 2026
Characterization at the Molecular Level using Robust Biochemical Approaches of a New Kinase Protein
Published on: June 30, 2019
Purification and assay of kinase-active EGF receptor from mammalian cells by immunoaffinity chromatography
Gregory J Wiepz1, Arturo G Guadaramma, David L Fulgham
1Department of Biomolecular Chemistry, University of Wisconsin, USA.
Abstract:
The epidermal growth factor (EGF) receptor possesses intrinsic protein-tyrosine kinase activity, and both overexpressed wild-type and mutated forms have been associated with many types of cancers. Therefore, understanding the mechanisms that modulate receptor activity and function is essential to the development of treatments for many of these cancers. However, to address this issue by either conventional or high-throughput screening methods requires the availability of large amounts of highly purified and active EGF receptor. The technique described in this chapter utilizes immunoaffinity chromatography, which allows for the isolation of highly purified and active preparations of EGF receptor. By immobilizing an antibody that recognizes the ligand-binding domain of the receptor to Sepharose beads, the receptor can be eluted specifically from the antibody by the addition of EGF. This association establishes a unique interaction that ensures the isolation of a highly enriched preparation of EGF receptor. This protocol allows for the purification of large or small batches of receptor that retain their kinase activity. Additionally, this chapter reports on the subsequent steps necessary to characterize the receptor: kinase activity, mass, purity, and the ability of the receptor to undergo autophosphorylation.
Insights
Purifying active epidermal growth factor (EGF) receptor is crucial for cancer research. Immunoaffinity chromatography provides a method to isolate highly pure, active EGF receptor for further study.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Epidermal growth factor (EGF) receptor is a protein-tyrosine kinase implicated in various cancers.
- Understanding EGF receptor regulation is vital for developing targeted cancer therapies.
- High-throughput screening requires substantial amounts of purified, active EGF receptor.
Purpose of the Study:
- To describe a method for purifying active EGF receptor.
- To enable the isolation of large or small batches of EGF receptor that retain kinase activity.
- To detail subsequent characterization steps for the purified receptor.
Main Methods:
- Immunoaffinity chromatography using Sepharose beads immobilized with an antibody against the EGF receptor ligand-binding domain.
- Specific elution of the receptor using epidermal growth factor (EGF).
- Characterization of purified receptor for kinase activity, mass, purity, and autophosphorylation.
Main Results:
- Successful isolation of highly purified and active EGF receptor preparations.
- The protocol yields receptor that retains its intrinsic kinase activity.
- Demonstrated ability to purify both large and small batches of EGF receptor.
Conclusions:
- Immunoaffinity chromatography is an effective method for obtaining highly pure, active EGF receptor.
- This purification technique supports cancer research and drug development efforts.
- The protocol facilitates comprehensive characterization of EGF receptor function.
