5F7D
Structure of HLA-A2:01 with peptide G11N
Summary for 5F7D
Entry DOI | 10.2210/pdb5f7d/pdb |
Descriptor | HLA class I histocompatibility antigen, A-2 alpha chain, Beta-2-microglobulin, Peptide G11N, ... (5 entities in total) |
Functional Keywords | peptide complex, mhc, immune system |
Biological source | Homo sapiens (Human) More |
Cellular location | Membrane; Single-pass type I membrane protein: P01892 Secreted . Note=(Microbial infection) In the presence of M: P61769 |
Total number of polymer chains | 3 |
Total formula weight | 44613.55 |
Authors | Zajonc, D.M.,Remesh, S.G. (deposition date: 2015-12-07, release date: 2016-12-21, Last modification date: 2024-10-16) |
Primary citation | Remesh, S.G.,Andreatta, M.,Ying, G.,Kaever, T.,Nielsen, M.,McMurtrey, C.,Hildebrand, W.,Peters, B.,Zajonc, D.M. Unconventional Peptide Presentation by Major Histocompatibility Complex (MHC) Class I Allele HLA-A*02:01: BREAKING CONFINEMENT. J. Biol. Chem., 292:5262-5270, 2017 Cited by PubMed Abstract: Peptide antigen presentation by major histocompatibility complex (MHC) class I proteins initiates CD8 T cell-mediated immunity against pathogens and cancers. MHC I molecules typically bind peptides with 9 amino acids in length with both ends tucked inside the major A and F binding pockets. It has been known for a while that longer peptides can also bind by either bulging out of the groove in the middle of the peptide or by binding in a zigzag fashion inside the groove. In a recent study, we identified an alternative binding conformation of naturally occurring peptides from bound by HLA-A*02:01. These peptides were extended at the C terminus (PΩ) and contained charged amino acids not more than 3 residues after the anchor amino acid at PΩ, which enabled them to open the F pocket and expose their C-terminal extension into the solvent. Here, we show that the mechanism of F pocket opening is dictated by the charge of the first charged amino acid found within the extension. Although positively charged amino acids result in the Tyr-84 swing, amino acids that are negatively charged induce a not previously described Lys-146 lift. Furthermore, we demonstrate that the peptides with alternative binding modes have properties that fit very poorly to the conventional MHC class I pathway and suggest they are presented via alternative means, potentially including cross-presentation via the MHC class II pathway. PubMed: 28179428DOI: 10.1074/jbc.M117.776542 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (2.3 Å) |
Structure validation
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