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5T6Y

HLA-B*57:01 presenting TSTFEDVKILAF

Summary for 5T6Y
Entry DOI10.2210/pdb5t6y/pdb
Related5T6W 5T6X 5T6Z 5T70
DescriptorHLA class I histocompatibility antigen, B-57 alpha chain, Beta-2-microglobulin, Decapeptide: THR-SER-THR-PHE-GLU-ASP-VAL-LYS-ILE-LEU-ALA-PHE, ... (6 entities in total)
Functional Keywordshuman leukocyte antigen immunoglobulin domain antigen presentation, immune system
Biological sourceHomo sapiens (Human)
More
Cellular locationMembrane; Single-pass type I membrane protein: P18465
Secreted . Note=(Microbial infection) In the presence of M: P61769
Total number of polymer chains3
Total formula weight45191.21
Authors
Pymm, P.,Rossjohn, J.,Vivian, J.P. (deposition date: 2016-09-02, release date: 2017-03-01, Last modification date: 2023-10-04)
Primary citationPymm, P.,Illing, P.T.,Ramarathinam, S.H.,O'Connor, G.M.,Hughes, V.A.,Hitchen, C.,Price, D.A.,Ho, B.K.,McVicar, D.W.,Brooks, A.G.,Purcell, A.W.,Rossjohn, J.,Vivian, J.P.
MHC-I peptides get out of the groove and enable a novel mechanism of HIV-1 escape.
Nat. Struct. Mol. Biol., 24:387-394, 2017
Cited by
PubMed Abstract: Major histocompatibility complex class I (MHC-I) molecules play a crucial role in immunity by capturing peptides for presentation to T cells and natural killer (NK) cells. The peptide termini are tethered within the MHC-I antigen-binding groove, but it is unknown whether other presentation modes occur. Here we show that 20% of the HLA-B*57:01 peptide repertoire comprises N-terminally extended sets characterized by a common motif at position 1 (P1) to P2. Structures of HLA-B*57:01 presenting N-terminally extended peptides, including the immunodominant HIV-1 Gag epitope TW10 (TSTLQEQIGW), showed that the N terminus protrudes from the peptide-binding groove. The common escape mutant TSNLQEQIGW bound HLA-B*57:01 canonically, adopting a dramatically different conformation than the TW10 peptide. This affected recognition by killer cell immunoglobulin-like receptor (KIR) 3DL1 expressed on NK cells. We thus define a previously uncharacterized feature of the human leukocyte antigen class I (HLA-I) immunopeptidome that has implications for viral immune escape. We further suggest that recognition of the HLA-B*57:01-TW10 epitope is governed by a 'molecular tension' between the adaptive and innate immune systems.
PubMed: 28218747
DOI: 10.1038/nsmb.3381
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (1.76 Å)
Structure validation

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