The x-ray structures of a murine MHC class I molecule (H-2Kb) were determined in complex with two different viral peptides, derived from the vesicular stomatitis virus nucleoprotein (52-59), VSV-8, and the Sendai virus nucleoprotein (324-332), SEV-9. ...
The x-ray structures of a murine MHC class I molecule (H-2Kb) were determined in complex with two different viral peptides, derived from the vesicular stomatitis virus nucleoprotein (52-59), VSV-8, and the Sendai virus nucleoprotein (324-332), SEV-9. The H-2Kb complexes were refined at 2.3 A for VSV-8 and 2.5 A for SEV-9. The structure of H-2Kb exhibits a high degree of similarity with human HLA class I, although the individual domains can have slightly altered dispositions. Both peptides bind in extended conformations with most of their surfaces buried in the H-2Kb binding groove. The nonamer peptide maintains the same amino- and carboxyl-terminal interactions as the octamer primarily by the insertion of a bulge in the center of an otherwise beta conformation. Most of the specific interactions are between side-chain atoms of H-2Kb and main-chain atoms of peptide. This binding scheme accounts in large part for the enormous diversity of peptide sequences that bind with high affinity to class I molecules. Small but significant conformational changes in H-2Kb are associated with peptide binding, and these synergistic movements may be an integral part of the T cell receptor recognition process.
Related Citations:
Crystallization of Murine Major Histocompatibility Complex Class I H-2Kb with Single Peptides Stura, E.A.,Matsumura, M.,Fremont, D.H.,Saito, Y.,Peterson, P.A.,Wilson, I.A. (1992) J.Mol.Biol. 228: 975
Crystal Structure of an H-2Kb-Ovalbumin Peptide Complex Reveals the Interplay of Primary and Secondary Anchor Positions in the Major Histocompatibility Complex Binding Groove Fremont, D.H.,Stura, E.A.,Matsumura, M.,Peterson, P.A.,Wilson, I.A. (1995) Proc.Natl.Acad.Sci.USA 92: 2479
Emerging Principles for the Recognition of Peptide Antigens by Mhc Class I Molecules Matsumura, M.,Fremont, D.H.,Peterson, P.A.,Wilson, I.A. (1992) Science 257: 927
Organizational Affiliation:
Department of Molecular Biology, Scripps Research Institute, La Jolla, CA 92037.
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