3cdg: Difference between revisions

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{{STRUCTURE_3cdg|  PDB=3cdg  |  SCENE=  }}  
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'''Human CD94/NKG2A in complex with HLA-E'''
===Human CD94/NKG2A in complex with HLA-E===




==Overview==
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The recognition of human leukocyte antigen (HLA)-E by the heterodimeric CD94-NKG2 natural killer (NK) receptor family is a central innate mechanism by which NK cells monitor the expression of other HLA molecules, yet the structural basis of this highly specific interaction is unclear. Here, we describe the crystal structure of CD94-NKG2A in complex with HLA-E bound to a peptide derived from the leader sequence of HLA-G. The CD94 subunit dominated the interaction with HLA-E, whereas the NKG2A subunit was more peripheral to the interface. Moreover, the invariant CD94 subunit dominated the peptide-mediated contacts, albeit with poor surface and chemical complementarity. This unusual binding mode was consistent with mutagenesis data at the CD94-NKG2A-HLA-E interface. There were few conformational changes in either CD94-NKG2A or HLA-E upon ligation, and such a "lock and key" interaction is typical of innate receptor-ligand interactions. Nevertheless, the structure also provided insight into how this interaction can be modulated by subtle changes in the peptide ligand or by the pairing of CD94 with other members of the NKG2 family. Differences in the docking strategies used by the NKG2D and CD94-NKG2A receptors provided a basis for understanding the promiscuous nature of ligand recognition by NKG2D compared with the fidelity of the CD94-NKG2 receptors.
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==Disease==
==Disease==
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[[Category: Signal-anchor]]
[[Category: Signal-anchor]]
[[Category: Transmembrane]]
[[Category: Transmembrane]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 06:48:10 2008''

Revision as of 03:48, 28 July 2008

File:3cdg.png

Template:STRUCTURE 3cdg

Human CD94/NKG2A in complex with HLA-E

Template:ABSTRACT PUBMED 18332182

Disease

Known disease associated with this structure: Hypoproteinemia, hypercatabolic OMIM:[109700]

About this Structure

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

Reference

CD94-NKG2A recognition of human leukocyte antigen (HLA)-E bound to an HLA class I leader sequence., Petrie EJ, Clements CS, Lin J, Sullivan LC, Johnson D, Huyton T, Heroux A, Hoare HL, Beddoe T, Reid HH, Wilce MC, Brooks AG, Rossjohn J, J Exp Med. 2008 Mar 17;205(3):725-35. Epub 2008 Mar 10. PMID:18332182

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