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CUTTING EDGE |
*
Department of Immunobiology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA; and
Center for Medical Genetics, Department of Cytogenetics and Molecular Genetics, Women’s and Children’s Hospital, Adelaide, Australia
The genetic defect in X-linked lymphoproliferative syndrome (XLP) is the Src homology 2 domain-containing protein SAP. SAP constitutively associates with the cell surface molecule, signaling lymphocytic activation molecule (SLAM), and competes with SH2-domain containing protein tyrosine phosphatase-2 (SHP-2) for recruitment to SLAM. SLAM exhibits homology with the mouse cell surface receptor 2B4. The human homologue of 2B4 has now been identified. It is recognized by the c1.7 mAb, a mAb capable of activating human NK cells. Human 2B4 became tyrosine phosphorylated following pervanadate-treatment of transfected cells and recruited SHP-2. SAP was also recruited to 2B4 in activated cells. Importantly, the 2B4-SAP interaction prevented the association between 2B4 and SHP-2. These results suggest that the phenotype of XLP may result from perturbed signaling not only through SLAM, but also other cell surface molecules that utilize SAP as a signaling adaptor protein.
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