3UTQ | pdb_00003utq

Structural basis for the killing of human beta cells by CD8(+) T cells in type 1 diabetes.

Bulek, A.M.,&nbspCole, D.K.,&nbspSkowera, A.,&nbspDolton, G.,&nbspGras, S.,&nbspMadura, F.,&nbspFuller, A.,&nbspMiles, J.J.,&nbspGostick, E.,&nbspPrice, D.A.,&nbspDrijfhout, J.W.,&nbspKnight, R.R.,&nbspHuang, G.C.,&nbspLissin, N.,&nbspMolloy, P.E.,&nbspWooldridge, L.,&nbspJakobsen, B.K.,&nbspRossjohn, J.,&nbspPeakman, M.,&nbspRizkallah, P.J.,&nbspSewell, A.K.

(2012) Nat Immunol&nbsp13: 283-289

• PubMed:&nbsp22245737&nbspSearch on PubMedSearch on PubMed Central
• DOI:&nbsphttps://doi.org/10.1038/ni.2206
• Primary Citation of Related Structures: &nbsp
  3UTP, 3UTQ, 3UTS, 3UTT


• PubMed Abstract:&nbsp
  

  The structural characteristics of the engagement of major histocompatibility complex (MHC) class II-restricted self antigens by autoreactive T cell antigen receptors (TCRs) is established, but how autoimmune TCRs interact with complexes of self peptide and MHC class I has been unclear. Here we examined how CD8(+) T cells kill human islet beta cells in type 1 diabetes via recognition of a human leukocyte antigen HLA-A*0201-restricted glucose-sensitive preproinsulin peptide by the autoreactive TCR 1E6. Rigid 'lock-and-key' binding underpinned the 1E6-HLA-A*0201-peptide interaction, whereby 1E6 docked similarly to most MHC class I-restricted TCRs. However, this interaction was extraordinarily weak because of limited contacts with MHC class I. TCR binding was highly peptide centric, dominated by two residues of the complementarity-determining region 3 (CDR3) loops that acted as an 'aromatic-cap' over the complex of peptide and MHC class I (pMHCI). Thus, highly focused peptide-centric interactions associated with suboptimal TCR-pMHCI binding affinities might lead to thymic escape and potential CD8(+) T cell-mediated autoreactivity.

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Organizational Affiliation:&nbsp

Institute of Infection and Immunity, Cardiff University School of Medicine, Heath Park, Cardiff, UK.