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Syk-dependent Phosphorylation of CLEC-2: A Novel Mechanism of Hem-Immunoreceptor Tyrosine-Based Activation Motif Signaling

Severin, S. and Pollitt, A. Y. and Navarro-Nunez, L. and Nash, C. A. and Mourao-Sa, D. and Eble, J. A. and Senis, Y. A. and Watson, Steve P (2011) Syk-dependent Phosphorylation of CLEC-2: A Novel Mechanism of Hem-Immunoreceptor Tyrosine-Based Activation Motif Signaling. Journal of Biological Chemistry, 286 (6). p. 4107. ISSN 0021-9258

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URL of Published Version: http://dx.doi.org/10.1074/jbc.M110.167502

Identification Number/DOI: doi:10.1074/jbc.M110.167502

The C-type lectin-like receptor CLEC-2 signals via phosphorylation of a single cytoplasmic YXXL sequence known as a hem-immunoreceptor tyrosine-based activation motif (hemITAM). In this study, we show that phosphorylation of CLEC-2 by the snake toxin rhodocytin is abolished in the absence of the tyrosine kinase Syk but is not altered in the absence of the major platelet Src family kinases, Fyn, Lyn, and Src, or the tyrosine phosphatase CD148, which regulates the basal activity of Src family kinases. Further, phosphorylation of CLEC-2 by rhodocytin is not altered in the presence of the Src family kinase inhibitor PP2, even though PLCγ2 phosphorylation and platelet activation are abolished. A similar dependence of phosphorylation of CLEC-2 on Syk is also seen in response to stimulation by an IgG mAb to CLEC-2, although interestingly CLEC-2 phosphorylation is also reduced in the absence of Lyn. These results provide the first definitive evidence that Syk mediates phosphorylation of the CLEC-2 hemITAM receptor with Src family kinases playing a critical role further downstream through the regulation of Syk and other effector proteins, providing a new paradigm in signaling by YXXL-containing receptors.

Type of Work:Article
Date:2011 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Medical & Dental Sciences
Department:Centre for Cardiovascular Sciences, Institute of Biomedical Research
Subjects:R Medicine (General)
QP Physiology
Institution:University of Birmingham
Copyright Holders:Journal of Biological Chemistry
ID Code:581
Refereed:YES
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