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Highly Stoichiometric, Stable, and Specific Association of Integrin alpha 3beta 1 with CD151 Provides a Major Link to Phosphatidylinositol 4-Kinase, and May Regulate Cell Migration

Robert L. Yauch,*dagger Fedor Berditchevski,dagger Dagger Mary Beth Harler,§ Jonathan Reichner,§ and Martin E. Hemler*parallel

 *Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute and Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115;  Dagger The University of Birmingham, CRC Institute for Cancer Studies, Birmingham, United Kingdom B15 2TA; and  §Department of Surgical Research, Rhode Island Hospital, Providence, Rhode Island 02903

Here we describe an association between alpha 3beta 1 integrin and transmembrane-4 superfamily (TM4SF) protein CD151. This association is maintained in relatively stringent detergents and thus is remarkably stable in comparison with previously reported integrin-TM4SF protein associations. Also, the association is highly specific (i.e., observed in vitro in absence of any other cell surface proteins), and highly stoichiometric (nearly 90% of alpha 3beta 1 associated with CD151). In addition, alpha 3beta 1 and CD151 appeared in parallel on many cell lines and showed nearly identical skin staining patterns. Compared with other integrins, alpha 3beta 1 exhibited a considerably higher level of associated phosphatidylinositol-4-kinase (PtdIns 4-kinase) activity, most of which was removed upon immunodepletion of CD151. Specificity for CD151 and PtdIns 4-kinase association resided in the extracellular domain of alpha 3beta 1, thus establishing a novel paradigm for the specific recruitment of an intracellular signaling molecule. Finally, antibodies to either CD151 or alpha 3beta 1 caused a ~88-92% reduction in neutrophil motility in response to f-Met-Leu-Phe on fibronectin, suggesting an functionally important role of these complexes in cell migration.


dagger    These authors contributed equally to this work.
parallel    Corresponding author.



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