1lk2
From Proteopedia
1.35A crystal structure of H-2Kb complexed with the GNYSFYAL peptide
Overview
We identify and consider some characteristics of a peptide antagonist for the Ag-specific receptor on 2C cells (the 2C TCR). The peptide, GNYSFYAL (called GNY), binds to H-2K(b), and a very high-resolution crystal structure of the GNY-K(b) complex at 1.35 A is described. Although the GNY peptide does not bind to L(d), the potency of GNY-K(b) as an antagonist is evident from its ability to specifically inhibit 2C TCR-mediated reactions to an allogenic agonist complex (QLSPFPFDL-L(d)), as well as to a syngeneic agonist complex (SIYRYYGL-K(b)). The crystal structure and the activities of alanine-substituted peptide variants point to the properties of the peptide P4 side chain and the conformation of the Tyr-P6 side chain as the structural determinants of GNYSFYAL antagonist activity.
About this Structure
1LK2 is a Protein complex structure of sequences from Mus musculus. Full crystallographic information is available from OCA.
Reference
A peptide that antagonizes TCR-mediated reactions with both syngeneic and allogeneic agonists: functional and structural aspects., Rudolph MG, Shen LQ, Lamontagne SA, Luz JG, Delaney JR, Ge Q, Cho BK, Palliser D, McKinley CA, Chen J, Wilson IA, Eisen HN, J Immunol. 2004 Mar 1;172(5):2994-3002. PMID:14978103 Page seeded by OCA on Fri May 2 23:59:38 2008
