title: Recruitment of tyrosine phosphatase HCP by the killer cell inhibitor receptor.
abstract: Cytolysis of target cells by natural killer (NK) cells and by some cytotoxic T cells occurs unless prevented by inhibitory receptors that recognize MHC class I on target cells. Human NK cells express a p58 inhibitory receptor specific for HLA-C. We report association of the tyrosine phosphatase HCP with the p58 receptor in NK cells. HCP association was dependent on tyrosine phosphorylation of p58. Phosphotyrosyl peptides corresponding to the p58 tail bound and activated HCP in vitro. Furthermore, introduction of an inactive mutant HCP into an NK cell line prevented the p58-mediated inhibition of target cell lysis. These data imply that the inhibitory function of p58 is dependent on its tyrosine phosphorylation and on recruitment and activation of HCP.
authors.affiliation: Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, Maryland 20852, USA.
authors.forename: D N
authors.initials: DN
authors.lastname: Burshtyn
authors.forename: A M
authors.initials: AM
authors.lastname: Scharenberg
authors.forename: N
authors.initials: N
authors.lastname: Wagtmann
authors.forename: S
authors.initials: S
authors.lastname: Rajagopalan
authors.forename: K
authors.initials: K
authors.lastname: Berrada
authors.forename: T
authors.initials: T
authors.lastname: Yi
authors.forename: J P
authors.initials: JP
authors.lastname: Kinet
authors.forename: E O
authors.initials: EO
authors.lastname: Long
mesh_terms: D000595:Amino Acid Sequence; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D015236:HLA-C Antigens / Q000276:immunology / Q000378:metabolism*; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology* / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000276:immunology*; D018160:Receptors, Cytoplasmic and Nuclear / Q000276:immunology*; D011971:Receptors, Immunologic / Q000276:immunology*; D000097682:Lamin B Receptor
chemical_list: D015236:HLA-C Antigens; D017027:Protein Tyrosine Phosphatases; D018160:Receptors, Cytoplasmic and Nuclear; D011971:Receptors, Immunologic; D000097682:Lamin B Receptor