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Interaction between the CD8 coreceptor and major histocompatibility complex class I stabilizes T cell receptor-antigen complexes at the cell surface

Wooldridge, Linda, Berg, Hugo A. van den, Glick, Meir, Gostick, Emma, Laugel, Bruno Frederic, Hutchinson, Sarah L., Milicic, Anita, Brenchley, Jason M., Douek, Daniel C., Price, David and Sewell, Andrew 2005. Interaction between the CD8 coreceptor and major histocompatibility complex class I stabilizes T cell receptor-antigen complexes at the cell surface. The Journal of Biological Chemistry 280 (30) , pp. 27491-27501. 10.1074/jbc.M500555200

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Abstract

The off-rate (koff) of the T cell receptor (TCR)/peptide-major histocompatibility complex class I (pMHCI) interaction, and hence its half-life, is the principal kinetic feature that determines the biological outcome of TCR ligation. However, it is unclear whether the CD8 coreceptor, which binds pMHCI at a distinct site, influences this parameter. Although biophysical studies with soluble proteins show that TCR and CD8 do not bind cooperatively to pMHCI, accumulating evidence suggests that TCR associates with CD8 on the T cell surface. Here, we titrated and quantified the contribution of CD8 to TCR/pMHCI dissociation in membrane-constrained interactions using a panel of engineered pMHCI mutants that retain faithful TCR interactions but exhibit a spectrum of affinities for CD8 of >1,000-fold. Data modeling generates a “stabilization factor” that preferentially increases the predicted TCR triggering rate for low affinity pMHCI ligands, thereby suggesting an important role for CD8 in the phenomenon of T cell cross-reactivity.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Systems Immunity Research Institute (SIURI)
Subjects: R Medicine > R Medicine (General)
Publisher: American Society for Biochemistry and Molecular Biology
ISSN: 1083-351X
Last Modified: 04 Jun 2017 01:31
URI: http://orca.cf.ac.uk/id/eprint/344

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