Characterization of a Single-chain Antibody to the β-Chain of the T Cell Receptor (∗)

• Published in: The Journal of biological chemistry Vol. 270; no. 43; pp. 25819 - 25826
• Main Authors: Cho, Bryan K., Schodin, Beth A., Kranz, David M.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 27-10-1995
• Subjects: Amino Acid Sequence; Animals; Antibody Specificity; Base Sequence; Cloning, Molecular; Cytotoxicity, Immunologic; Enterotoxins - immunology; Escherichia coli; Histocompatibility Antigens - immunology; Immunoglobulin Fab Fragments - genetics; Immunoglobulin Fab Fragments - immunology; Immunoglobulin Heavy Chains - genetics; Immunoglobulin Heavy Chains - immunology; Immunoglobulin Light Chains - genetics; Immunoglobulin Light Chains - immunology; Immunoglobulin Variable Region - genetics; Immunoglobulin Variable Region - immunology; Mice; Molecular Probes; Molecular Sequence Data; Peptides - immunology; Receptors, Antigen, T-Cell, alpha-beta - immunology; Recombinant Proteins - immunology; Sequence Analysis, DNA; Staphylococcus; Superantigens - immunology; T-Lymphocytes - immunology
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.270.43.25819

In this report the VH and VL genes of the anti-T cell receptor (TCR) antibody KJ16, which recognizes the TCR Vβ8.1 and Vβ8.2 regions in mice, were cloned and expressed as a single-chain antibody (scFv) in Escherichia coli. A 29-kDa protein was obtained after renaturation from inclusion bodies. The KJ16 scFv had a relative affinity for the native TCR that was slightly higher than KJ16 Fab fragments. The scFv and Fab fragments of the KJ16 antibody, together with monovalent forms of two other anti-TCR antibodies, were evaluated as antagonists of the T cell-mediated recognition of a peptide-class I complex or of a superantigen, Staphylococcus enterotoxin B (SEB) bound to a class II product. Each of the anti-TCR antibodies was efficient at inhibiting the recognition of the SEB-class II complex. In contrast, only the clonotypic antibody, which binds to epitopes on both the Vβ and Vα regions, inhibited the recognition of peptide-class I complex. We conclude that the TCR binding site for the SEB-class II ligand encompasses a larger surface area than the TCR binding site for the peptide-class I ligand.