The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1997/4/1523/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 8, April 21, 1997 1523-1528


Brief Definitive Reports

The Direct Binding of a p58 Killer Cell Inhibitory Receptor to Human Histocompatibility Leukocyte Antigen (HLA)-Cw4 Exhibits Peptide Selectivity

Sumati Rajagopalan and Eric O. Long

From the Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852

Natural killer (NK) cells in mice and humans express a number of structurally diverse receptors that inhibit target cell lysis upon recognition of major histocompatibility complex (MHC) class I molecules expressed on targets. The contribution of peptide to the structural features of class I required for NK cell inhibition appears to vary depending on the type of receptor engaged. Thus, while there is no peptide specificity in NK inhibition mediated by Ly-49A in the mouse, human histocompatibility antigen (HLA)-B*2705–specific NK clones displayed selectivity for peptides. In this report, we examine the role of peptide in the recognition of HLA-C by the defined killer cell inhibitory receptor (KIR) cl42 with established specificity for HLA-Cw4. Binding of soluble KIR cl42 molecules to HLA-Cw4 expressed on transporter associated with antigen presentation (TAP)-deficient RMA-S cells occurred only upon exogenous peptide loading. Moreover, there was peptide selectivity in that certain substitutions at positions 7 and 8 of the nonamer peptide QYDDAVYKL abolished Cw4 interaction with KIR cl42 despite similar surface expression of HLA-C. The specificity of this direct interaction between peptideloaded HLA-Cw4 on RMA-S cells and soluble KIR cl42 correlated with recognition by NK clones in that they were inhibited only by HLA-Cw4 loaded with the appropriate peptides.


Address correspondence to Eric O. Long, LIG NIAID NIH Twinbrook II, 12441 Parklawn Drive, Rockville, MD 20852-1727.


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