Abstract
A multigene family to human Ig-SF receptors and members of the murine Ly49 C-type lectin family are involved in natural killer (NK) cell-mediated recognition of MHC class I molecules. The human CD94 glycoprotein covalently assembles with different C-type lectins of the NKG2 family. By functional criteria, the CD94/NKG2-A (kp43) receptor complex appears also involved in NK cell-mediated recognition of different HLA class I allotypes. Similarly to the other NK inhibitory receptors, NKG2-A contains cytoplasmic immunoreceptor tyrosine-based inhibitory motifs (ITIMS). By contrast, NK clones bearing different receptor complex (CD94/p39) are triggered upon ligation by CD94-specific monoclonal antibodies (MAbs); the p39 subunit is likely encoded by other member(s) of the NKG2 family. Expression of different CD94/NKG2 complexes is warranted to precisely assess their specific interaction with HLA class I molecules, and the molecular basis for their divergent functional properties.
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