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Download Anti-ZAP-70 [pTyrpTyr315/319]Phosphospecific Antibody
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RESEARCH USE ONLY POLYCLONAL ANTIBODY Anti-ZAP-70 [pTyrpTyr315/319]Phosphospecific Antibody, Unconjugated Code No. AT-7091 Isotype: Rabbit IgG Quantity: 100 μL BACKGROUND: Zeta-associated protein (ZAP-70), a 70 kDa member of the Syk tyrosine kinase family, plays a central role in lymphocyte activation and development, and is implicated in several immune disorders. Upon T-cell antigen receptor (TCR) engagement, ZAP-70 is phosphorylated on tyrosines 292, 315 and 319 in the interdomain B, located between the SH2 and kinase domains. Phosphorylation of both tyrosines 315 (a Vav-binding site) and 319 (a Lck binding site) enhances ZAP-70 function in mediating lymphocyte signaling, while tyrosine 292 terminates the transient activation of ZAP-70 and attentuates lymphocyte signaling. Phosphorylation of tyrosines 315 and 319 plays an important role in mediating the positive and negative selection of T cells in thymus. PRODUCT: Rabbit polyclonal immunoglobulin in Dulbecco’s phosphate buffered saline (without Mg2+ and Ca2+), pH 7.3 (+/- 0.1), 50% glycerol, with 1.0 mg/mL BSA (IgG, protease free) as a carrier. 0.05% sodium azide. IMMUNOGEN: The antiserum was produced against a chemically synthesized phosphopeptide derived from the region of human ZAP-70 that contains tyrosines 315 and 319. The sequence is conserved in mouse PURIFICATION: Purified from rabbit serum by sequential epitope-specific chromatography. The antibody has been negatively preadsorbed using a non-phosphopeptide corresponding to the site of phosphorylation to remove antibody that is reactive with non-phosphorylated ZAP-70. The final product is generated by affinity chromatography using a ZAP-70-derived peptide that is phosphorylated at tyrosines 315 and 319. SPECIFICITY: Human ZAP-70. Mouse ZAP-70 (100% homologous) has not been tested, but is expected to react. Syk (85% homologous) may cross react in some cell systems. APPLICATIONS: The antibody has been used for Western blotting applications. For Western blotting applications, we recommend using the antibody at a 1:1000 dilution. The optimal antibody concentration should be determined empirically for each specific application. STORAGE: Store at −20oC. We recommend a brief centrifugation before opening to settle vial contents. Then, apportion into working aliquots and store at −20oC. For shipment or short-term storage (up to one week), 2-8oC is sufficient. POSITIVE CONTROL: Jurkat cells treated with H2O2. 15 B Constitution Way · Woburn, MA 01801 · Phone: 1.800.200.5459 · Fax: 781-939-6963 · www.mblintl.com RESEARCH USE ONLY REFERENCES: Orchard, J.A., et al. (2004) ZAP-70 expression and prognosis in chronic lymphocytic leukaemia. Lancet 363(9403): 105-111. Sakaguchi, N., et al. (2003) Altered thymic T-cell selection due to a mutation of the ZAP-70 gene causes autoimmune arthritis in mice Nature 426(6965): 454-460. Bottini, N., et al. (2002) Activation of ZAP-70 through specific dephosphorylation at the inhibitory Tyr-292 by the low molecular weight phosphotyrosine phosphatase (LMPTP). J. Biol. Chem. 277(27): 24220-24224. Di Bartolo, V., et al. (2002) Tyrosine 315 determines optimal recruitment of ZAP-70 to the T cell antigen receptor. Eur. J. Immunol. 32(2): 568-575. Magnan, A., et al. (2001) T cell development and T cell responses in mice with mutations affecting tyrosines 292 or 315 of the ZAP-70 protein tyrosine kinase. J. Exp. Med. 194(4): 491-505. ong, Q., et al. (2001) Requirement for tyrosine residues 315 and 319 within zeta chain-associated protein 70 for T cell development. J. Exp. Med. 194(4): 507-518. Wu, J., et al. (1997) The Vav binding site (Y315) in ZAP-70 is critical for antigen receptor-mediated signal transduction. J. Exp. Med. 185(10): 1877-1882. Kong, G., et al. (1996) Distinct tyrosine phosphorylation sites in ZAP-70 mediate activation and negative regulation of antigen receptor function. Mol. Cell. Biol. 16(9): 5026-5035. Peptide Competition and Phosphatase Treatment Lysates prepared from Jurkat cells left untreated (1) or treated with H2O2 (2-6) were resolved by SDS-PAGE on a 10% polyacrylamide gel and transferred to PVDF. Membranes were either left untreated (1-6) or treated with YOP phosphatase (7), blocked with a 5% BSA-TBST buffer for one hour at room temperature, and incubated with ZAP-70 [pTyrpTyr315/319] antibody for two hours at room temperature in a 3% BSA-TBST buffer, following prior incubation with: no peptide (1, 2, 6), the non-phosphopeptide corresponding to the immunogen (3), a generic phosphotyrosine-containing peptide (4) the phosphopeptide immunogen (5) or, the phosphopeptide corresponding to ZAP-70 [pTyr315] (6). After washing, membranes were incubated with goat F(ab’)2 anti-rabbit IgG HRP conjugate and bands were detected using the Pierce SuperSignal™ method. The data show that only the peptide corresponding to ZAP-70 [pTyrpTyr315/319] completely blocks the antibody signal. The data also show that phosphatase stripping eliminates the signal, verifying that the antibody is phospho-specific. 15 B Constitution Way · Woburn, MA 01801 · Phone: 1.800.200.5459 · Fax: 781-939-6963 · www.mblintl.com