3CII

Structure of NKG2A/CD94 bound to HLA-E


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.41 Å
  • R-Value Free: 0.355 
  • R-Value Work: 0.321 

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This is version 1.1 of the entry. See complete history


Literature

Structural basis for NKG2A/CD94 recognition of HLA-E.

Kaiser, B.K.Pizarro, J.C.Kerns, J.Strong, R.K.

(2008) Proc Natl Acad Sci U S A 105: 6696-6701

  • DOI: 10.1073/pnas.0802736105
  • Primary Citation of Related Structures:  
    3CII

  • PubMed Abstract: 
  • The NKG2x/CD94 (x = A, C, E) natural killer-cell receptors perform an important role in immunosurveillance by binding to HLA-E complexes that exclusively present peptides derived from MHC class I leader sequences, thereby monitoring MHC class I expre ...

    The NKG2x/CD94 (x = A, C, E) natural killer-cell receptors perform an important role in immunosurveillance by binding to HLA-E complexes that exclusively present peptides derived from MHC class I leader sequences, thereby monitoring MHC class I expression. We have determined the crystal structure of the NKG2A/CD94/HLA-E complex at 4.4-A resolution, revealing two critical aspects of this interaction. First, the C-terminal region of the peptide, which displays the most variability among class I leader sequences, interacts entirely with CD94, the invariant component of these receptors. Second, residues 167-170 of NKG2A/C account for the approximately 6-fold-higher affinity of the inhibitory NKG2A/CD94 receptor compared to its activating NKG2C/CD94 counterpart. These residues do not contact HLA-E or peptide directly but instead form part of the heterodimer interface with CD94. An evolutionary analysis across primates reveals that whereas CD94 is evolving under purifying selection, both NKG2A and NKG2C are evolving under positive selection. Specifically, residues at the CD94 interface have evolved under positive selection, suggesting that the evolution of these genes is driven by an interaction with pathogen-derived ligands. Consistent with this possibility, we show that NKG2C/CD94, but not NKG2A/CD94, weakly but specifically binds to the CMV MHC-homologue UL18. Thus, the evolution of the NKG2x/CD94 family of receptors has likely been shaped both by the need to bind the invariant HLA-E ligand and the need to avoid subversion by pathogen-derived decoys.


    Organizational Affiliation

    Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, alpha chain EAD273Homo sapiensMutation(s): 0 
Gene Names: HLA-EHLA-6.2HLAE
Find proteins for P13747 (Homo sapiens)
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PHAROS  P13747
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinBE100Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
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PHAROS  P61769
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen peptideCF9N/AMutation(s): 0 
Find proteins for P17693 (Homo sapiens)
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PHAROS  P17693
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Natural killer cells antigen CD94GI121Homo sapiensMutation(s): 0 
Gene Names: KLRD1CD94
Find proteins for Q13241 (Homo sapiens)
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PHAROS  Q13241
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
NKG2-A/NKG2-B type II integral membrane proteinHJ120Homo sapiensMutation(s): 0 
Gene Names: KLRC1NKG2A
Find proteins for P26715 (Homo sapiens)
Explore P26715 
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PHAROS  P26715
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.41 Å
  • R-Value Free: 0.355 
  • R-Value Work: 0.321 
  • Space Group: I 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 345.983α = 90
b = 345.983β = 90
c = 345.983γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-05-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance