Regulation of mouse PECAM-1 tyrosine phosphorylation by the Src and Csk families of protein-tyrosine kinases.
PECAM-1 is an adhesion molecule expressed on hemopoietic and endothelial cells. Recently, it was observed that PECAM-1 becomes tyrosine-phosphorylated in response to a variety of physiological stimuli. Furthermore, tyrosine-phosphorylated PECAM-1 was shown to associate with SHP-2, a Src homology 2 (SH2) domain-containing protein-tyrosine phosphatase expressed ubiquitously. In light of the ... significance of tyrosine protein phosphorylation as a regulatory mechanism, we wished to understand better the nature and impact of the protein-tyrosine kinases (PTKs) mediating PECAM-1 tyrosine phosphorylation. Through reconstitution experiments in COS-1 cells, we determined that mouse PECAM-1 could be tyrosine-phosphorylated by Src-related PTKs and Csk-related PTKs, but not by other kinases such as Syk, Itk, and Pyk2. Using site-directed mutagenesis and peptide phosphorylation studies, we found that these PTKs were efficient at phosphorylating Tyr-686, but not Tyr-663, of PECAM-1. Src-related enzymes also phosphorylated mouse PECAM-1 at one or more yet to be identified sites. In other studies, we demonstrated that phosphorylation of PECAM-1 by Src or Csk family kinases was sufficient to trigger its association with SHP-2. Moreover, it was able to promote binding of PECAM-1 to SHP-1, a SHP-2-related protein-tyrosine phosphatase expressed in hemopoietic cells. Taken together, these findings indicated that the Src and Csk families of kinases are strong candidates for mediating tyrosine phosphorylation of PECAM-1 and triggering its association with SH2 domain-containing phosphatases under physiological circumstances.
Mesh Terms:
Amino Acid Sequence, Animals, Antigens, CD31, COS Cells, Intracellular Signaling Peptides and Proteins, Mice, Molecular Sequence Data, Phosphorylation, Protein Tyrosine Phosphatase, Non-Receptor Type 11, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatases, Protein-Tyrosine Kinases, Proto-Oncogene Proteins pp60(c-src), SH2 Domain-Containing Protein Tyrosine Phosphatases, Tyrosine, src-Family Kinases
Amino Acid Sequence, Animals, Antigens, CD31, COS Cells, Intracellular Signaling Peptides and Proteins, Mice, Molecular Sequence Data, Phosphorylation, Protein Tyrosine Phosphatase, Non-Receptor Type 11, Protein Tyrosine Phosphatase, Non-Receptor Type 6, Protein Tyrosine Phosphatases, Protein-Tyrosine Kinases, Proto-Oncogene Proteins pp60(c-src), SH2 Domain-Containing Protein Tyrosine Phosphatases, Tyrosine, src-Family Kinases
J. Biol. Chem.
Date: Jun. 19, 1998
PubMed ID: 9624175
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