Nitration of PECAM-1 ITIM tyrosines abrogates phosphorylation and SHP-2 binding |
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Authors: | Newman Debra K Hoffman Sara Kotamraju Srigiridhar Zhao Tieming Wakim Bassam Kalyanaraman Balaraman Newman Peter J |
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Institution: | Blood Research Institute, The Blood Center of Southeastern Wisconsin, 53226, Milwaukee, WI, USA. dknewman@bcsew.edu |
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Abstract: | Platelet-endothelial cell adhesion molecule-1 (PECAM-1) is a cell adhesion molecule with a cytoplasmic immunoreceptor tyrosine-based inhibitory motif (ITIM) that, when phosphorylated, binds Src homology 2 domain-containing protein-tyrosine phosphatase (SHP-2). PECAM-1 is expressed at endothelial cell junctions where exposure to inflammatory intermediates may result in post-translational amino acid modifications that affect protein structure and function. Reactive nitrogen species (RNS), which are produced at sites of inflammation, nitrate tyrosine residues, and several proteins modified by tyrosine nitration have been found in diseased tissue. We show here that the RNS, peroxynitrite, induced nitration of both full-length cellular PECAM-1 and a purified recombinant PECAM-1 cytoplasmic domain. Mass spectrometric analysis of tryptic fragments revealed quantitative nitration of ITIM tyrosine 686. A synthetic peptide containing 3-nitrotyrosine at position 686 could not be phosphorylated nor bind SHP-2. These data suggest that ITIM tyrosine nitration may represent a mechanism for modulating phosphotyrosine-dependent signal transduction pathways. |
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Keywords: | Antigens/CD31 Nitric acid/metabolism Peroxynitrous acid/metabolism Phosphorylation Phosphotyrosine Protein binding Protein-tyrosine phosphatase/antagonists and inhibitors Reactive nitrogen species Signal transduction Tyrosine/analogs and derivatives |
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