Catalog # EX5445

phospho-eEF2K (Ser-398) Peptide

Blocking Peptide

Application / Dilution
ELISA50 ng/well

Size 50 μg



Eukaryotic elongation factor 2 (eEF2) catalyzes the translocation of peptidyl-tRNA from the A site to the P site on the ribosome. eEF2 kinase (eEF2K) phosphorylates and inactivates eEF2, resulting in the inhibition of peptide-chain elongation. eEF2K is normally dependent on Ca2+ ions and calmodulin, and can be activated by PKA in response to elevated cAMP levels during cell stress- or starvation-related conditions. Regulation of eEF2K occurs through phosphorylation at multiple sites. Ser-78 phosphorylation is required for calmodulin binding and eEF2K activity, while phosphorylation of Ser-500 is required for Ca2+/calmodulin-independent kinase activity. Thr-348 and Ser-445 are two of the major autophosphorylation sites required for kinase activity. Inhibitory phosphorylation may also regulate eEF2K, since phosphorylation at Ser-359 by SAPK4/p38δ causes inactivation of eEF2K. In addition, Ser-398 phosphorylation is required for eEFK2 induced autophagy. Thus, multisite phospho-regulation of eEF2K may be important for proper control of eEF2K activity and protein translation.


Cheng, Y. et al. (2013) Autophagy. 9(2):208.
Tavares, C.D. et al. (2012) Biochemistry. 51(11):2232.
Smith, E.M. & Proud, C.G. (2008) EMBO J. 27(7):1005.
Ryazanov, A.G. et al. (1997) PNAS. USA. 94:4884.

Phospho-eEF2K (Ser-398) synthetic peptide corresponds to amino acids surrounding Ser-398 in human eEF2K. This sequence is well conserved in rat and mouse eEF2K, and has low homology to other proteins.

*For more information, see UniProt Accession O00418
Blocking Peptide is supplied in 50µl phosphate-buffered saline and 0.05% sodium azide.

The products are are safely shipped at ambient temperature for both domestic and international shipments. Each product is guaranteed to match the specifications as indicated on the corresponding technical data sheet. Please store at -20C upon arrival for long term storage.

The peptide is specifically recognized by eEF2K (Ser-398) phospho-specific antibody (EP5441) in ELISA, and has been shown to block the reactivity of EP5441 in Western blot. In addition, the peptide is recommended for use in blocking EP5441 reactivity in immunocytochemistry.

*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blot mobilities of known proteins with similar MW.

This kit contains: