Identification and characterization of leukocyte-associated Ig-like receptor-1 as a major anchor protein of tyrosine phosphatase SHP-1 in hematopoietic cells.
SHP-1, an SH2 domain-containing tyrosine phosphatase, has a crucial role in hematopoiesis. Here we report that SHP-1 is associated with two major tyrosine-phosphorylated proteins in hematopoietic cells treated with the tyrosine phosphatase inhibitor, pervanadate. One of the proteins corresponds to leukocyte-associated Ig-like receptor-1 (LAIR-1), a recently cloned transmembrane protein. Molecular ... cloning revealed four isoforms of the protein. LAIR-1 is hyper-phosphorylated on tyrosyl residues in cells overexpressing a catalytically inactive mutant form of SHP-1 as well as in pervanadate-treated cells. An antibody against the extracellular domain of the protein also induced its tyrosine phosphorylation. Tyrosine-phosphorylated LAIR-1 specifically interacts with SHP-1 but not with SHP-2, a structurally related tyrosine phosphatase. Using site-specific mutagenesis, we demonstrated that Tyr(233) and Tyr(263), each embedded in an immunoreceptor tyrosine-based inhibitory motif, are responsible for tyrosine phosphorylation of LAIR-1 and recruitment of SHP-1. Both tyrosyl residues are required for SHP-1 binding. Protein kinases responsible for tyrosine phosphorylation of LAIR-1 may belong to the Src family since PP1, a Src family kinase inhibitor, significantly inhibited its phosphorylation. As a major binding protein of SHP-1 on the plasma membrane, LAIR-1 may play an important role in hematopoietic cell signaling.
Mesh Terms:
Amino Acid Sequence, Amino Acid Substitution, Binding Sites, Cell Line, Cloning, Molecular, HL-60 Cells, Hematopoiesis, Humans, Intracellular Signaling Peptides and Proteins, Jurkat Cells, Kidney, Molecular Sequence Data, Mutagenesis, Site-Directed, Protein Tyrosine Phosphatase, Non-Receptor Type 11, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatases, Receptors, Immunologic, Recombinant Proteins, SH2 Domain-Containing Protein Tyrosine Phosphatases, Transfection, Tyrosine, src Homology Domains
Amino Acid Sequence, Amino Acid Substitution, Binding Sites, Cell Line, Cloning, Molecular, HL-60 Cells, Hematopoiesis, Humans, Intracellular Signaling Peptides and Proteins, Jurkat Cells, Kidney, Molecular Sequence Data, Mutagenesis, Site-Directed, Protein Tyrosine Phosphatase, Non-Receptor Type 11, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatases, Receptors, Immunologic, Recombinant Proteins, SH2 Domain-Containing Protein Tyrosine Phosphatases, Transfection, Tyrosine, src Homology Domains
J. Biol. Chem.
Date: Jun. 09, 2000
PubMed ID: 10764762
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