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With the help of 16 chimaeras between human epidermal growth factor (hEGF) and human transforming growth factor alpha (hTGF alpha), a detailed analysis was performed on the epitope recognized by two polyclonal antibodies raised against hEGF, and one polyclonal antibody raised against hTGF alpha. All three antibodies recognized essentially the same antigenic site, a non-linear and conformation-dependent sequence that is located near the second and fourth disulphide-bonded cysteines and that includes the start of the B-loop beta-sheet. The epitope recognized by the anti-hEGF antibodies was further characterized using 8 chimaeras between hEGF and an EGF-repeat from Drosophila Notch and was found to include Met(21), Ala(30) and Asn(32). All three polyclonal antibodies were able to neutralize the biological activity of the respective growth factor when tested on 32D murine haematopoietic progenitor cells transfected with ErbB-1, indicating that the receptor binding domain is shielded upon binding of the antibody.

Non-linear antigenic regions in epidermal growth factor (EGF) and transforming growth factor α (TGFα) studied by EGF‒TGFα chimaeras