Journal article

The structural basis for autonomous dimerization of the pre-T-cell antigen receptor

Siew Siew Pang, Richard Berry, Zhenjun Chen, Lars Kjer-Nielsen, Matthew A Perugini, Glenn F King, Christina Wang, Sock Hui Chew, Nicole L La Gruta, Neal K Williams, Travis Beddoe, Tony Tiganis, Nathan P Cowieson, Dale I Godfrey, Anthony W Purcell, Matthew CJ Wilce, James McCluskey, Jamie Rossjohn



The pre-T-cell antigen receptor (pre-TCR), expressed by immature thymocytes, has a pivotal role in early T-cell development, including TCR β-selection, survival and proliferation of CD4(-)CD8(-) double-negative thymocytes, and subsequent αβ T-cell lineage differentiation. Whereas αβTCR ligation by the peptide-loaded major histocompatibility complex initiates T-cell signalling, pre-TCR-induced signalling occurs by means of a ligand-independent dimerization event. The pre-TCR comprises an invariant α-chain (pre-Tα) that pairs with any TCR β-chain (TCRβ) following successful TCR β-gene rearrangement. Here we provide the basis of pre-Tα-TCRβ assembly and pre-TCR dimerization. The pre-Tα chain co..

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Funding Acknowledgements

We thank S. Turner for discussions; S. Ramarathinam for technical assistance; the staff at the Australian synchrotron (MX and SAXS/WAXS beamlines) and Berkeley Advanced Light Source (SIBYLS beamline) for assistance with data collection; and T. Caradoc-Davies for advice on processing of merohedral twinned X-ray data. This research was supported by grants from the Australian Research Council and the National Health and Medical Research Council of Australia. A.W.P., T.T. and M.C.J.W. are supported by NHMRC Senior Research Fellowships, and D.I.G. is supported by an NHMRC Principal Research Fellowship. M.A.P. is supported by an ARC Future Fellowship and J.R. is supported by an ARC Federation Fellowship.