Rabbit Anti-4E Binding Protein 1 (Protein Synthesis Initiation Factor 4E Binding Protein, eIF-4EBP1, PHAS-1, PHAS-I, Eukaryotic Translation Initiation Factor BP)
4E-BP1 (also known as PHAS-1) normally binds eIF4E, inhibiting cap-dependent translation. Hyperphosphorylation of 4E-BP1 disrupts this binding, activating cap-dependent translation (1). The PI3 kinase/Akt pathway and FRAP/mTOR kinase regulate 4E-BP1 (2,3). 4E-BP1 is phosphorylated in vivo on multiple residues (4); phosphorylation by FRAP/mTOR on Thr37 and Thr46 of human 4E-BP1 may prime it for subsequent phosphorylation at sites including Ser65 and Thr70 (5).
Applications
Suitable for use in Immunoprecipitation and Western Blot. Other applications not tested.
Recommended Dilution
Western Blot: 1:1000 Immunoprecipitation: 1:50 Optimal dilutions to be determined by the researcher.
Storage and Stability
May be stored at 4°C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20°C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
Immunogen
Synthetic peptide corresponding to residues surrounding Ser112 of human 4E-BP1. MW of Antigen: 15-20kD.
Form
Supplied as a liquid in 10mM sodium HEPES, pH 7.5, 150mM sodium chloride, 0.1mg/ml BSA, 50% glycerol.
Purity
Purified by protein A and peptide affinity chromatography.
Specificity
Recognizes endogenous levels of total human 4E-BP1 independent of phosphorylation. Species Crossreactivity: mouse, rat and monkey.
