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Nat Immunol. 2016 May;17(5):574-82. doi: 10.1038/ni.3392. Epub 2016 Mar 21.

Initiation of T cell signaling by CD45 segregation at 'close contacts'.

Author information

1
Radcliffe Department of Medicine and MRC Human Immunology Unit, John Radcliffe Hospital, University of Oxford, Oxford, UK.
2
Department of Chemistry, University of Cambridge, Cambridge, UK.
3
Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, UK.

Abstract

It has been proposed that the local segregation of kinases and the tyrosine phosphatase CD45 underpins T cell antigen receptor (TCR) triggering, but how such segregation occurs and whether it can initiate signaling is unclear. Using structural and biophysical analysis, we show that the extracellular region of CD45 is rigid and extends beyond the distance spanned by TCR-ligand complexes, implying that sites of TCR-ligand engagement would sterically exclude CD45. We also show that the formation of 'close contacts', new structures characterized by spontaneous CD45 and kinase segregation at the submicron-scale, initiates signaling even when TCR ligands are absent. Our work reveals the structural basis for, and the potent signaling effects of, local CD45 and kinase segregation. TCR ligands have the potential to heighten signaling simply by holding receptors in close contacts.

PMID:
26998761
PMCID:
PMC4839504
DOI:
10.1038/ni.3392
[Indexed for MEDLINE]
Free PMC Article

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