4p23

J809.B5 TCR bound to IAb/3K

spinqualitylabelsall models 4p23, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4p23 is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 3rdt, 4p46 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The mature T cell repertoire has the ability to orchestrate immunity to a wide range of potential pathogen challenges. This ability stems from thymic development producing individual T cell clonotypes that express TCRs with unique patterns of Ag reactivity. The Ag specificity of TCRs is created from the combinatorial pairing of one of a set of germline encoded TCR Valpha and Vbeta gene segments with randomly created CDR3 sequences. How the amalgamation of germline encoded and randomly created TCR sequences results in Ag receptors with unique patterns of ligand specificity is not fully understood. Using cellular, biophysical, and structural analyses, we show that CDR3alpha residues can modulate the geometry in which TCRs bind peptide-MHC (pMHC), governing whether and how germline encoded TCR Valpha and Vbeta residues interact with MHC. In addition, a CDR1alpha residue that is positioned distal to the TCR-pMHC binding interface is shown to contribute to the peptide specificity of T cells. These findings demonstrate that the specificity of individual T cell clonotypes arises not only from TCR residues that create direct contacts with the pMHC, but also from a collection of indirect effects that modulate how TCR residues are used to bind pMHC. Effect of CDR3 Sequences and Distal V Gene Residues in Regulating TCR-MHC Contacts and Ligand Specificity.,Stadinski BD, Trenh P, Duke B, Huseby PG, Li G, Stern LJ, Huseby ES J Immunol. 2014 May 9. PMID:24813203 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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