5T70

KIR3DL1 in complex with HLA-B*57:01 presenting TSNLQEQIGW


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

MHC-I peptides get out of the groove and enable a novel mechanism of HIV-1 escape.

Pymm, 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.

(2017) Nat Struct Mol Biol 24: 387-394

  • DOI: https://doi.org/10.1038/nsmb.3381
  • Primary Citation of Related Structures:  
    5T6W, 5T6X, 5T6Y, 5T6Z, 5T70

  • 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.


  • Organizational Affiliation

    Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, B-57 alpha chain276Homo sapiensMutation(s): 0 
Gene Names: HLA-BHLAB
UniProt & NIH Common Fund Data Resources
Find proteins for P01889 (Homo sapiens)
Explore P01889 
Go to UniProtKB:  P01889
PHAROS:  P01889
GTEx:  ENSG00000234745 
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UniProt GroupP01889
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-2-microglobulin99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
GTEx:  ENSG00000166710 
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UniProt GroupP61769
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Killer cell immunoglobulin-like receptor 3DL1C [auth G]299Homo sapiensMutation(s): 0 
Gene Names: KIR3DL1CD158ENKAT3NKB1
UniProt & NIH Common Fund Data Resources
Find proteins for P43629 (Homo sapiens)
Explore P43629 
Go to UniProtKB:  P43629
PHAROS:  P43629
GTEx:  ENSG00000167633 
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UniProt GroupP43629
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  • Reference Sequence

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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Decapeptide: THR-SER-ASN-LEU-GLN-GLU-GLN-ILE-GLY-TRPD [auth C]10synthetic constructMutation(s): 0 
UniProt
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B (isolate BH10))
Explore P03366 
Go to UniProtKB:  P03366
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UniProt GroupP03366
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.177 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.726α = 96.04
b = 61.209β = 97.46
c = 65.186γ = 108.72
Software Package:
Software NamePurpose
BUSTERrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-03-01
    Type: Initial release
  • Version 1.1: 2017-04-19
    Changes: Database references
  • Version 1.2: 2017-08-09
    Changes: Data collection, Structure summary
  • Version 1.3: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.4: 2023-10-04
    Changes: Data collection, Database references, Refinement description, Structure summary