T cell receptor signaling is limited by docking geometry to peptide-major histocompatibility complex.

T cell receptor signaling is limited by docking geometry to peptide-major histocompatibility complex.
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DOI:
10.1016/j.immuni.2011.09.013
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发表时间:
2011-11-23
期刊:
影响因子:
32.4
通讯作者:
Garcia KC
Garcia KC
中科院分区:
医学1区
文献类型:
--
作者:
Adams JJ;Narayanan S;Liu B;Birnbaum ME;Kruse AC;Bowerman NA;Chen W;Levin AM;Connolly JM;Zhu C;Kranz DM;Garcia KC

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T cell receptor (TCR) engagement of peptide-major histocompatibility complex (MHC) is essential to adaptive immunity, but it is unknown if TCR signaling responses are influenced by the binding topology of the TCR-peptide-MHC complex. We developed yeast-displayed peptide-MHC libraries that enabled us to identify new peptide sequences reactive with a single TCR. Structural analysis showed that four peptides bound to the TCR with distinct 3-dimensional (3D) and 2D affinities, using entirely different binding chemistries. Three of the peptides that shared a common docking mode, where key TCR-MHC germline interactions are preserved, induced TCR signaling. The fourth peptide failed to induce signaling, and was recognized in a substantially different TCR-MHC binding mode that apparently exceeded geometric tolerances compatible with signaling. We suggest that the ‘stereotypical’ TCR-MHC docking paradigm evolved from productive signaling geometries, and that TCR signaling can be modulated by peptides that are recognized in alternative TCR-pMHC binding orientations.
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