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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Ligand-induced association between the T-cell antigen receptor and two glycoproteins.

We have identified two cell surface glycoproteins of 34 and 38 kDa (gp34 and gp38) that associate with the T-cell antigen receptor (TCR). The coimmunoprecipitation of these proteins with the TCR is increased by treatment with monoclonal antibodies (mAbs) directed against the TCR prior to cell solubilization and immunoprecipitation. Treatment of T cells with mAbs directed against other cell surface molecules, CD2 or HLA, does not induce the association of these proteins with the TCR. The coimmunoprecipitation of gp34 and gp38 with the TCR requires solubilization in the presence of an alkylating agent, suggesting that subunit alkylation stabilizes the interaction. J.CaM1 and J.CaM2 are signal-transduction mutant cell lines derived from Jurkat. These cell lines fail to activate the inositol phospholipid second messenger pathway in response to anti-TCR mAbs. Treatment with mAb C305 (anti-TCR) induces the association of gp34 and gp38 with the TCR in J.CaM2 cells but not in J.CaM1. J.CaM1 modulates the TCR normally in response to anti-TCR antibody treatment. This observation suggests that gp34 and gp38 are involved in the signal-transduction pathway of the TCR complex rather than receptor internalization. Furthermore, since these proteins do associate with the TCR of J.CaM2, the induced association with the TCR is not a consequence of signal transduction.[1]

References

  1. Ligand-induced association between the T-cell antigen receptor and two glycoproteins. Fraser, J.D., Goldsmith, M.A., Weiss, A. Proc. Natl. Acad. Sci. U.S.A. (1989) [Pubmed]
 
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