Cell Signaling Technology

Product Pathways - PathScan ELISA

PathScan® Phospho-4E-BP1 (Thr37/Thr46) Sandwich ELISA Antibody Pair #7854

Kit Includes Volume Cap Color
4E-BP1 (Thr37/46) Rabbit Capture Antibody (100X) 0.4 milliliters Pink
4E-BP1 Mouse Detection Antibody (100X) 0.4 milliliters Blue
Anti-Mouse IgG, HRP-Linked Antibody (1000X) 0.04 milliliters Yellow

Capture and Detection Antibodies are stored at 4°C. HRP-Linked Secondary Antibody is stored at -20°C.

Species Cross-Reactivity

H M R Mk

Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey

Description

CST's PathScan® Phospho-4E-BP1 (Thr37/Thr46) Sandwich ELISA Antibody Pair is being offered as an economical alternative to our PathScan® Phospho-4E-BP1 (Thr37/Thr46) Sandwich ELISA Kit #7216. Capture and Detection antibodies (100X stocks) and HRP-conjugated secondary antibody (1000X stock) are supplied. Sufficient reagents are supplied for 4 x 96 well ELISAs. The Phospho-4E-BP1 (Thr37/Thr46) Capture Antibody is coated in PBS overnight in a 96 well microplate. After blocking, cell lysates are added followed by a 4E-BP1 Detection Antibody and anti-Mouse IgG, HRP conjugated antibody. HRP substrate, TMB, is added for color development. The magnitude of the absorbance for this developed color is proportional to the quantity of Phospho-4E-BP1 (Thr37/Thr46) protein.*Antibodies in this kit are custom formulations specific to the kit.

Sandwich ELISA

Sandwich ELISA

The relationship between the protein concentration of lysate from amino acid (AA)/untreated and AA/insulin-treated HEK- 293T cells and the absorbance at 450 nM using PathScan® Phospho-4E-BP1 (Thr37/Thr46) Sandwich ELISA Antibody Pair #7854 is shown. HEK-293T cells were serum-starved overnight and deprived of amino acids for 1 hour. The amino acids were replenished for 1 hour. Cells were either untreated or stimulated with 100 nM insulin for 30 minutes at 37°C.

Background

Translation repressor protein 4E-BP1 (also known as PHAS-1) inhibits cap-dependent translation by binding to the eIF4E translation initiation factor. 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 on 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).

  1. Pause, A. et al. (1994) Nature 371, 762-767.
  2. Brunn, G.J. et al. (1997) Science 277, 99-101.
  3. Gingras, A.C. et al. (1998) Genes Dev. 12, 502-513.
  4. Fadden, P. et al. (1997) J. Biol. Chem. 272, 10240-10247.
  5. Gingras, A.C. et al. (1999) Genes Dev. 13, 1422-1437.

Application References

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This product is for in vitro research use only and is not intended for use in humans or animals. This product is not intended for use as therapeutic or in diagnostic procedures.

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