Thy-1 associated pp85--90 is a potential docking site for SH2 domain-containing signal transduction molecules |
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Authors: | Durrheim G A Garnett D Dennehy K M Beyers A D |
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Institution: | Department of Medical Physiology and Biochemistry, University of Stellenbosch Medical School, Tygerberg, South Africa. gad@gerga.sun.ac.za |
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Abstract: | Thy-1, a glycosylphosphatidylinositol (GPI)-anchored glycoprotein expressed at high levels on thymocytes, has been implicated in positive and negative signal transduction. We show that Thy-1 associates with a protein of 85--90 kDa, which is prominently phosphorylated in vitro as well as in vivo following the stimulation of thymocytes with pervanadate. pp85--90 is not identical to known proteins that are phosphorylated following T cell activation. The SH2 domains of fyn, csk, phosphatidylinositol 3'-kinase, rasGAP, vav and lck bind to pp85--90 with varying affinities. The SH2 domains of ZAP70, SHP-1 and PLC gamma 1 and the SH3 domains of lck, vav and HS1 did not bind to pp85--90. The molecular weight, iso-electric point, efficient phosphorylation by fyn and lck and preferential binding to the SH2 domain of fyn compared to that of lck indicate that Thy-1-associated pp85-90 may be identical to a recently cloned, fyn-associated transmembrane adaptor protein, PAG-85. |
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Keywords: | Thy‐1 glycosphingolipid‐enriched membrane domains (GEMs) PAG‐85 SH2 domains tyrosine kinase |
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