کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
3356206 | 1217243 | 2008 | 8 صفحه PDF | دانلود رایگان |
The T cell antigen receptor (TCR-CD3) consists of the pMHC-binding TCRαβ heterodimer and the signalling dimers CD3δɛ, CD3γɛ and ζζ. The very short length of the extracellular domain (EC) of the ζ chain is preserved through evolution, however a rational explanation for this observation has not been elucidated. Here, we show that TCR-CD3 assembly is clearly defective when the murine ζ EC domain is artificially enlarged. Under these conditions, the TCR-CD3 complex is super-competent in transducing activation signals upon engagement. Furthermore, the TCR-CD3 complexes containing enlarged ζ EC domains underwent ligand-induced conformation changes with higher efficiency than TCR-CD3 complexes with an unmodified ζ EC domain. Together these data suggest that a short ζ EC domain is needed to correctly assemble the TCR-CD3 complex. When this domain is enlarged, the resulting TCR-CD3 complex is distorted leading to a hyperactive phenotype and enhanced T cell activation.
Journal: Immunology Letters - Volume 116, Issue 2, 15 March 2008, Pages 195–202