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J Biol Chem, Vol. 273, Issue 51, 34115-34119, December 18, 1998
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From the Natural killer cell and T cell subsets express at
their cell surface a repertoire of receptors for MHC class I molecules, the natural killer cell receptors (NKRs). NKRs are characterized by the
existence of inhibitory and activating isoforms, which are encoded by
highly homologous but separate genes present in the same locus.
Inhibitory isoforms express an intracytoplasmic immunoreceptor
tyrosine-based inhibition motif, whereas activating isoforms lack any
immunoreceptor tyrosine-based inhibition motif but harbor a charged
amino acid residue in their transmembrane domain. We previously
characterized KARAP (killer cell activating receptor-associated
protein), a novel disulfide-linked tyrosine-phosphorylated dimer that
selectively associates with the activating NKR isoforms. We report here
the identification of the mouse KARAP gene, its localization on chromosome 7 and its genomic organization in five exons. Point mutation and transfection studies revealed that KARAP is a
novel signaling transmembrane subunit whose transduction function
depends on the integrity of an intracytoplasmic immunoreceptor tyrosine-based activation motif. In contrast to previous members of the
immunoreceptor tyrosine-based activation motif polypeptide family,
KARAP is ubiquitously expressed on hematopoietic and nonhematopoietic cells, suggesting its association with a broad range of activating receptors in a variety of tissues.
Centre d'Immunologie INSERM/CNRS de
Marseille-Luminy, Case 906, 13288 Marseille cedex 09, France, the
§ IBCP, CNRS UPR 412, 69 367 Lyon cedex 07, France, the
¶ CNRS, E.P.91, 13402 Marseille cedex 20, France, the
INSERM U491, Faculté de Médecine de la Timone,
Marseille, France, and the ** Institut Universitaire de France,
Paris, 75005 France
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