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Conformational Restraints and Flexibility of 14-Meric Peptides in Complex with HLA-B*3501¹

Michael Probst-Kepper^2,3,*,, Hans-Jürgen Hecht^2,3,, Hanne Herrmann, Viktoria Janke^*, Frank Ocklenburg^*, Jürgen Klempnauer^*, Benoit J. van den Eynde and Siegfried Weiss

^* Department of Visceral and Transplant Surgery, Hannover Medical School, Hannover, Germany; Departments of Cell Biology and Immunology, and Structural Biology, German Research Centre for Biotechnology, Braunschweig, Germany; and Ludwig Institute for Cancer Research, Brussels, Belgium

Human HLA-B*3501 binds an antigenic peptide of 14-aa length derived from an alternative reading frame of M-CSF with high affinity. Due to its extraordinary length, the exact HLA binding mode was unpredictable. The crystal structure of HLA-B*3501 at 1.5 Å shows that the N and C termini of the peptide are embedded in the A and F pockets, respectively, similar to a peptide of normal length. The central part of the 14-meric peptide bulges flexibly out of the groove. Two variants of the alternative reading frame of M-CSF peptide substituted at P2 or P2 and P9 with Ala display weak or no T cell activation. Their structure differs mainly in flexibility and conformation from the agonistic peptide. Moreover, the variants induce subtle changes of MHC -helical regions implicated as critical for TCR contact. The TCR specifically recognizing this peptide/MHC complex exhibits CDR3 length within the normal range, suggesting major conformational adaptations of this receptor upon peptide/MHC binding. Thus, the potential antigenic repertoire recognizable by CTLs is larger than currently thought.

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The JI 2004 173: 5331-5332. [Full Text]  

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