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|51367S||100 µl (10 western blots)||$112.00.0|
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4E-BP1 Control Cell Extracts #51367
As controls, CST recommends using 10 µl of nonphosphorylated and phosphorylated 4E-BP1 cell extracts. Boil for 2 minutes in the original tube, then load 10 μl per mini-gel lane.
Nonphosphorylated 4E-BP1 Control Cell Extracts: Total cell extracts from MCF7 cells, prepared by starving the cells of amino acids for 1 hour, serve as a negative control.
Phosphorylated 4E-BP1 Control Cell Extracts: Total cell extracts from MCF7 cells, prepared by starving the cells of amino acids for 1 hour and then adding back amino acids for 1 hour and treating with insulin for 30 min, serve as a positive control.
Translation repressor protein 4E-BP1 (also known as PHAS-1) inhibits cap-dependent translation by binding to the translation initiation factor eIF4E. Hyperphosphorylation of 4E-BP1 disrupts this interaction and results in activation of cap-dependent translation (1). Both the PI3 kinase/Akt pathway and FRAP/mTOR kinase regulate 4E-BP1 activity (2,3). Multiple 4E-BP1 residues are phosphorylated in vivo (4). While phosphorylation by FRAP/mTOR at Thr37 and Thr46 does not prevent the binding of 4E-BP1 to eIF4E, it is thought to prime 4E-BP1 for subsequent phosphorylation at Ser65 and Thr70 (5).
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