Glycogen Synthase Kinase 3 alpha, phosphorylated (Ser21), Blocking Peptide (GSK3a)

This peptide is used to block Phospho-GSK-3a (Ser21) Rabbit mAb #G8170-40D5 reactivity.||Glycogen synthase kinase-3 (GSK-3) was initially identified as an enzyme that regulated glycogen synthesis in response to insulin (1). GSK-3 is a ubiquitously expressed serine/threonine protein kinase that phosphorylates and inactivates glycogen synthase. GSK-3 is a critical downstream element of the PI3 kinase/Akt cell survival pathway, and its activity can be inhibited by Akt-mediated phosphorylation at Ser21 of GSK-3a and Ser9 of GSK-3b (2,3). GSK-3 has been implicated in the regulation of cell fate in Dictyostelium, and is a component of the Wnt signaling pathway required for Drosophila, Xenopus and mammalian development (4). GSK-3 has been shown to regulate cyclin D1 proteolysis and subcellular localization (5).||Quality Control:|The quality of the peptide was evaluated by reversed-phase HPLC and by mass spectrometry. The peptide blocks Phospho-GSK-3a (Ser21) Rabbit mAb #G8170-40D5 by immunohistochemistry.||Applications:|Use as a blocking reagent to evaluate the specificity of antibody reactivity in immunohistochemistry protocols. Other applications not tested.||Directions for Use:|For immunohistochemistry, add twice the volume of peptide as volume of antibody used in 100ul total volume. Incubate for a minimum of 30 minutes prior to adding the entire volume to the slide. Recommended antibody dilutions can be found on the product data sheet.||Storage and Stability:|May be stored at 4°C for short-term only. For long-term storage, store at -20°C. Aliquots are stable for at least 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.