Recognition of the Major Histocompatibility Complex (MHC) class Ib molecule H2-Q10 by the natural killer cell receptor Ly49C
| Autor: | Lucy C. Sullivan, Michiko Mirams, Gautham R. Balaji, Joseph A. Trapani, Jacqueline M.L. Widjaja, Felix A. Deuss, Jamie Rossjohn, Daniel M. Andrews, Nicole L. LaGruta, Natasha Sosnin, Richard Berry, Andrew G. Brooks |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Stereochemistry Antigen presentation Immunology Peptide binding Major histocompatibility complex Crystallography X-Ray Biochemistry Natural killer cell 03 medical and health sciences Mice 0302 clinical medicine Protein Domains MHC class I medicine Animals Receptor Histocompatibility Antigen H-2D Protein Structure Quaternary Molecular Biology Mice Knockout biology H-2 Antigens Cell Biology MHC restriction R1 Cell biology Killer Cells Natural 030104 developmental biology medicine.anatomical_structure Docking (molecular) biology.protein NK Cell Lectin-Like Receptor Subfamily A 030215 immunology |
| ISSN: | 0021-9258 |
| Popis: | Murine natural killer (NK) cells are regulated by the interaction of Ly49 receptors with major histocompatibility complex class I molecules (MHC-I). Although the ligands for inhibitory Ly49 were considered to be restricted to classical MHC (MHC-Ia), we have shown that the non-classical MHC molecule (MHC-Ib) H2-M3 was a ligand for the inhibitory Ly49A. Here we establish that another MHC-Ib, H2-Q10, is a bona fide ligand for the inhibitory Ly49C receptor. H2-Q10 bound to Ly49C with a marginally lower affinity (∼5 μm) than that observed between Ly49C and MHC-Ia (H-2K(b)/H-2D(d), both ∼1 μm), and this recognition could be prevented by cis interactions with H-2K in situ To understand the molecular details underpinning Ly49·MHC-Ib recognition, we determined the crystal structures of H2-Q10 and Ly49C bound H2-Q10. Unliganded H2-Q10 adopted a classical MHC-I fold and possessed a peptide-binding groove that exhibited features similar to those found in MHC-Ia, explaining the diverse peptide binding repertoire of H2-Q10. Ly49C bound to H2-Q10 underneath the peptide binding platform to a region that encompassed residues from the α1, α2, and α3 domains, as well as the associated β2-microglobulin subunit. This docking mode was conserved with that previously observed for Ly49C·H-2K(b) Indeed, structure-guided mutation of Ly49C indicated that Ly49C·H2-Q10 and Ly49C·H-2K(b) possess similar energetic footprints focused around residues located within the Ly49C β4-stand and L5 loop, which contact the underside of the peptide-binding platform floor. Our data provide a structural basis for Ly49·MHC-Ib recognition and demonstrate that MHC-Ib represent an extended family of ligands for Ly49 molecules. |
| Databáze: | OpenAIRE |
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