Cell Signaling Technology

Product Pathways - Translational Control

4EHP (D54C2) Rabbit mAb #6916

Applications Reactivity Sensitivity MW (kDa) Isotype
W H Endogenous 28 Rabbit IgG

Applications Key:  W=Western Blotting
Reactivity Key:  H=Human
Species cross-reactivity is determined by western blot. Species enclosed in parentheses are predicted to react based on 100% sequence homology.

Protocols

Specificity / Sensitivity

4EHP (D54C2) Rabbit mAb recognizes endogenous levels of total 4EHP protein.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the amino terminus of human 4EHP protein.

Western Blotting

Western Blotting

Western blot analysis of extracts from 293 and RD cells using 4EHP (D54C2) Rabbit mAb.

Background

Eukaryotic initiation factor 4E (eIF4E) binds to the mRNA cap structure to mediate the initiation of translation (1,2). eIF4E interacts with eIF4G, a scaffold protein that promotes assembly of eIF4E and eIF4A into the eIF4F complex (2). eIF4B is thought to assist the eIF4F complex in translation initiation. Upon activation by mitogenic and/or stress stimuli mediated by Erk and p38 MAPK, Mnk1 phosphorylates eIF4E at Ser209 in vivo (3,4). Two Erk and p38 MAPK phosphorylation sites in mouse Mnk1 (Thr197 and Thr202) are essential for Mnk1 kinase activity (3). The carboxy-terminal region of eIF4G also contains serum-stimulated phosphorylation sites, including Ser1108, Ser1148, and Ser1192 (5). Phosphorylation at these sites is blocked by the PI3 kinase inhibitor LY294002 and by the FRAP/mTOR inhibitor rapamycin.

A mammalian cap-binding protein related to eIF4E, 4E Homologous Protein (4EHP), was later identified (6). 4EHP does not interact with eIF4G and therefore cannot activate translation (7). Instead, it inhibits the translation of a subset of mRNAs (7).

  1. Sonenberg, N. et al. (1978) Proc. Natl. Acad. Sci. USA 75, 4843-4847.
  2. Gingras, A.C. et al. (1999) Annu. Rev. Biochem. 68, 913-963.
  3. Waskiewicz, A. et al. (1999) Mol. Cell. Biol. 19, 1871-1880.
  4. Pyronnet, S. et al. (1999) EMBO J. 18, 270-279.
  5. Raught, B. et al. (2000) EMBO J. 19, 434-444.
  6. Rom, E. et al. (1998) J Biol Chem 273, 13104-9.
  7. Zuberek, J. et al. (2007) RNA 13, 691-7.

Application References

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Companion Products

For Research Use Only. Not For Use In Diagnostic Procedures.

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