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Peptide Scanning-assisted Identification of a Monoclonal Antibody-recognized Linear B-cell Epitope

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Enterotoxin residues determining T-cell receptor V beta binding specificity.

M J Irwin¹, K R Hudson, J D Fraser

¹Department of Immunology, Scripps Research Institute, La Jolla, California 92037.

|October 29, 1992

Summary

Staphylococcal enterotoxins bind to MHC class II and activate T cells. Two key amino acid residues in enterotoxins determine specific T-cell receptor interactions, differentiating between enterotoxin A and E binding to V beta 3 and V beta 11.

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Area of Science:

Immunology
Molecular Biology
Structural Biology

Background:

Superantigens, like staphylococcal enterotoxins, engage T cells via interactions with major histocompatibility complex (MHC) class II molecules and the T-cell receptor (TCR).
The TCR beta-chain is crucial for this interaction, but pinpointing specific enterotoxin regions responsible for TCR binding has been challenging due to confounding MHC interactions.

Purpose of the Study:

To identify the specific amino acid residues in staphylococcal enterotoxins responsible for differential binding to distinct T-cell receptor (TCR) V beta elements.
To elucidate the structural basis for the distinct T-cell activation profiles of staphylococcal enterotoxins A and E.

Main Methods:

Assaying the binding of staphylococcal enterotoxins A and E to soluble TCR beta-chain proteins (V beta 3 and V beta 11).
Constructing and analyzing hybrid enterotoxins to map critical residues involved in TCR binding specificity.
Utilizing truncated enterotoxins to investigate structure-function relationships in T-cell stimulation.

Main Results:

Staphylococcal enterotoxin A binds to V beta 3, while enterotoxin E binds to V beta 11, despite high sequence identity.
The study identified two specific amino acid residues near the carboxy terminus of the enterotoxins as critical determinants for V beta 3 and V beta 11 binding specificity.
These two residues are responsible for discriminating between enterotoxin A and E recognition by specific TCR V beta chains.

Conclusions:

A minimal set of two amino acid residues dictates the differential binding of staphylococcal enterotoxins A and E to distinct TCR V beta elements.
This finding provides crucial insights into the molecular mechanisms underlying superantigen-mediated T-cell activation and specificity.
Understanding these interactions can inform the development of targeted immunotherapies and diagnostics.