3cii: Difference between revisions

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{{STRUCTURE_3cii|  PDB=3cii  |  SCENE=  }}  
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'''Structure of NKG2A/CD94 bound to HLA-E'''
===Structure of NKG2A/CD94 bound to HLA-E===




==Overview==
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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.
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==About this Structure==
==About this Structure==
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[[Category: Signal-anchor]]
[[Category: Signal-anchor]]
[[Category: Transmembrane]]
[[Category: Transmembrane]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed May 14 11:33:45 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 15:11:28 2008''

Revision as of 12:11, 28 July 2008

File:3cii.png

Template:STRUCTURE 3cii

Structure of NKG2A/CD94 bound to HLA-E

Template:ABSTRACT PUBMED 18448674

About this Structure

3CII is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for NKG2A/CD94 recognition of HLA-E., Kaiser BK, Pizarro JC, Kerns J, Strong RK, Proc Natl Acad Sci U S A. 2008 May 6;105(18):6696-701. Epub 2008 Apr 30. PMID:18448674

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