Biophysical mechanism of T-cell receptor triggering in a reconstituted system.
Biophysical mechanism of T-cell receptor triggering in a reconstituted system.
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DOI:
10.1038/nature11220
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发表时间:
2012-07-05
期刊:
影响因子:
64.8
通讯作者:
Vale, Ronald D.
中科院分区:
文献类型:
--
作者:
James, John R.;Vale, Ronald D.
A T cell-mediated immune response is initiated by the T cell receptor (TCR) interacting with peptide-bound MHC (pMHC) on an infected cell. The mechanism by which this interaction triggers intracellular phosphorylation of the TCR, which lacks a kinase domain, remains poorly understood. Here, we have introduced the TCR and associated signalling molecules into a nonimmune cell and reconstituted ligand-specific signalling when these cells are conjugated with antigen presenting cells. We show that signalling requires the differential segregation of a phosphatase and kinase in the plasma membrane. An artificial, chemically-controlled receptor system generates the same effect as TCR-pMHC, demonstrating that the binding energy of an extracellular protein-protein interaction can drive the spatial segregation of membrane proteins without a transmembrane conformational change. This general mechanism may extend to other receptors that rely on extrinsic kinases, including, as we demonstrate, chimaeric antigen receptors being developed for cancer immunotherapy.
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