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Signaling Complex in Human
Natural Killer (NK) Cells
By


From the * Departments of Structural Biology and Microbiology & Immunology, Stanford University
Medical School, Stanford, California 94305; and the The killer cell inhibitory receptors (KIR) of human natural killer (NK) cells recognize human
leukocyte antigen class I molecules and inhibit NK cell cytotoxicity through their interaction
with protein tyrosine phosphatases (PTP). Here, we report that KIR recognition of class I
ligands inhibits distal signaling events and ultimately NK cell cytotoxicity by blocking the association of an adaptor protein (pp36) with phospholipase C-
Department of Human Immunology, DNAX
Research Institute for Molecular and Cellular Biology, Palo Alto, California 94304
in NK cells. In addition, we demonstrate that pp36 can serve as a substrate in vitro for the KIR-associated PTP, PTP-1C (also
called SHP-1), and that recognition of class I partially disrupts tyrosine phosphorylation of NK
cell proteins, providing evidence for KIR-induced phosphatase activity.
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