Mouse Anti-Phosphotyrosine-PE

The purified (UNLB) antibody is supplied as 0.5 mg of purified immunoglobulin in 1.0 mL of 100 mM borate buffered saline, pH 8.2. No preservatives or amine-containing buffer salts added. Store at 2-8 °C. <br>The fluorescein (FITC) conjugate is supplied as 0.5 mg in 1.0 mL of PBS/NaN3. Store at 2-8 °C. <br>The alkaline phosphatase (AP) conjugate is supplied as 1.0 mL of stock solution in 50mM Tris/1mM MgCl2/50% Glycerol, pH 8.0, containing 0.1% NaN3 as preservative. Store at 2-8 °C or long-term at -20 °C. <br>The horseradish peroxidase (HRP) conjugate is supplied as 1.0 mL of stock solution in 50% glycerol/50% PBS, pH 7.4. No preservative added. Store at 2-8 °C or long-term at -20 °C. <br>The biotin (BIOT) conjugate is supplied as 0.5 mg in 1.0 mL PBS/NaN3. Store at 2-8 °C. <br>The R-phycoerythrin (R-PE) conjugate is supplied as 0.1 mg in 1.0 mL of PBS/NaN3 and a stabilizing agent. Store at 2-8 °C. Do not freeze! <br>Reagents are stable for the period shown on the label if stored as directed.

Phosphorylated tyrosine and phenylphosphate<br>Protein tyrosine residues are phosphorylated as a result of intracellular protein kinase activation (e.g. via growth factors) during normal growth and development, and in oncogenesis. The most abundant population of target proteins for tyrosine phosphorylation are cell surface glycoproteins. Antibody to phosphotyrosine enables the detection, isolation and characterization of proteins containing phosphotyrosine. PY20 also prevents internalization of activated receptors, e.g. EGFr, when microinjected into cells. The affinity of PY20 for phosphotyrosine is approximately 10^-6 to 10^-7 M. PY20 binding to phosphorylated tyrosines can be inhibited by free phosphotyrosine and phenylphosphate, but not by phosphoserine, phosphothreonine or free phosphate. ^1-3