Tyrosine Phosphorylation of β3 Integrin Provides a Binding Site for Pyk2
| Autor: | Scott D. Blystone, Boyd Butler |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Cytoplasm
Time Factors Immunoblotting Integrin Biology Transfection Biochemistry chemistry.chemical_compound Cell Adhesion Humans Immunoprecipitation Phosphorylation Cell adhesion Cytoskeleton Beta (finance) Molecular Biology Glutathione Transferase Integrin alphaVbeta3 Binding Sites Integrin beta3 Tyrosine phosphorylation Cell Biology Protein-Tyrosine Kinases Actin cytoskeleton Actins Extracellular Matrix Cell biology Focal Adhesion Kinase 2 chemistry biology.protein Tyrosine K562 Cells Peptides Protein Binding Signal Transduction |
| Zdroj: | Journal of Biological Chemistry. 280:14556-14562 |
| ISSN: | 0021-9258 |
| DOI: | 10.1074/jbc.m411765200 |
| Popis: | Integrins expressed on leukocytes possess the ability to maintain themselves in a non-adhesive state, thus preventing unwarranted adhesion and uncontrolled inflammation. Leukocyte adhesion is regulated through the modulation of integrin receptors such as alpha(V)beta(3). Firm adhesion to the extracellular matrix and directed cellular motility requires the reorganization of the actin cytoskeleton. The ability of beta(3) to recruit signaling and scaffolding molecules to propagate alpha(V)beta(3) -mediated signals is regulated in part by the phosphorylation of the beta(3) cytoplasmic tail. The identities of integrin-associated signaling molecules within alpha(V)beta(3) podosomes and in particular the proximal binding partners of the beta(3) cytoplasmic tail are not completely known. Here we show that alpha(V)beta(3) ligation induces Pyk2-Tyr-402 phosphorylation and its association with the beta(3) cytoplasmic tail in a beta(3)-Tyr-747 phosphorylation-dependent manner. Pyk2 binding to the beta(3) cytoplasmic tail is direct and dependent upon Pyk2-Tyr-402 and beta(3) -Tyr-747 phosphorylations. These data identify Pyk2 as a phosphorylated beta(3) binding partner, providing a potential structural and signaling platform to achieve alpha(V)beta(3) -mediated remodeling of the actin cytoskeleton. |
| Databáze: | OpenAIRE |
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