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. 1987 Mar;84(6):1659–1663. doi: 10.1073/pnas.84.6.1659

Identification of a peptide binding protein that plays a role in antigen presentation.

E K Lakey, E Margoliash, S K Pierce
PMCID: PMC304496  PMID: 3031645

Abstract

The helper T-cell response to globular proteins appears, in general, to require intracellular processing of the antigen, such that a peptide fragment containing the T-cell antigenic determinant is released and transported to and held on the surface of an Ia-expressing, antigen-presenting cell. However, the molecular details underlying these phenomena are largely unknown. The means by which antigenic peptides are anchored on the antigen-presenting cell surface was investigated. A cell surface protein is identified that was isolated by its ability to bind to a 24-amino acid peptide fragment of pigeon cytochrome c, residues 81-104, containing the major antigenic determinant for B10.A mouse T cells. This peptide binding protein, purified from [35S]methionine-labeled cells, appears as two discrete bands of approximately equal to 72 and 74 kDa after NaDodSO4/PAGE. The protein can be eluted from the peptide affinity column with equivalent concentrations of either the antigenic pigeon cytochrome c peptide or the corresponding nonantigenic peptide of mouse cytochrome c. However, it does not bind to the native cytochromes c, either of pigeon or mouse, and thus the protein appears to recognize some structure available only in the free peptides. This protein plays a role in antigen presentation as evidenced by the ability of rabbit antibodies raised against it to block the activation of an antigen-specific T-cell hybrid by antigen-presenting cells and pigeon cytochrome c. Its expression is not major histocompatibility complex-restricted in that the blocking activity of the antisera can be absorbed on spleen cells from mice of different haplotypes. This peptide binding protein can be isolated from a variety of cell types, including B cells, T cells, and fibroblasts. The anchoring of processed peptides on the cell surface by such a protein may play a role in antigen presentation--facilitating the interaction of antigenic peptides with Ia and/or the T-cell receptor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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