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Volume 272, Number 1, Issue of January 3, 1997 pp. 228-232
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

The Related Adhesion Focal Tyrosine Kinase Is Tyrosine-phosphorylated after beta 1-Integrin Stimulation in B Cells and Binds to p130cas

(Received for publication, April 27, 1996, and in revised form, October 15, 1996)

Anne Astier Dagger , Hava Avraham § , Serge N. Manie Dagger , Jerome Groopman § , Timothy Canty Dagger , Shalom Avraham § and Arnold S. Freedman Dagger

From the Dagger  Division of Hematologic Malignancies, Dana-Farber Cancer Institute, and § Division of Hematology and Oncology, Deaconess Hospital, Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115

Integrin ligation initiates intracellular signaling events, among which are the activation of protein tyrosine kinases. The related adhesion focal tyrosine kinase (RAFTK), also known as PYK2 and CAKbeta , is a tyrosine kinase that is homologous to the focal adhesion kinase (FAK) p125FAK. The structure of RAFTK is similar to p125FAK in that it lacks a transmembrane region, does not contain Src homology 2 or 3 domains, and has a proline-rich region in its C terminus. Here we report that RAFTK is a target for beta 1-integrin-mediated tyrosine phosphorylation in both transformed and normal human B cells. Ligation of the B cell antigen receptor also induced tyrosine phosphorylation of RAFTK. Phosphorylation of RAFTK following integrin- or B cell antigen receptor-mediated stimulation was decreased by prior treatment of cells with cytochalasin B, indicating that this process was at least partially cytoskeleton-dependent. One of the tyrosine-phosphorylated substrates after integrin stimulation in fibroblasts is p130cas, which can associate with p125FAK. RAFTK also interacted constitutively with p130cas in B cells, since p130cas was detected in RAFTK immunoprecipitates. Although the function of RAFTK remains unknown, these data suggest that RAFTK may have a significant function in integrin-mediated signaling pathways in B cells.


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