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PathScan® Phospho-eIF2α (Ser51) Sandwich ELISA Kit

PathScan® Phospho-eIF2α (Ser51) Sandwich ELISA Kit #7948

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Figure 1. Treatment of Jurkat cells with 100 nM Calyculin A #9902 and 1 mM pervanadate increases phosphorylation of eIF2α at Ser51, detected by the PathScan® Phospho-eIF2α (Ser51) Sandwich ELISA Kit #7948, but does not affect the levels of total eIF2α detected by PathScan® Total eIF2α Sandwich ELISA Kit #7952. The absorbance readings at 450 nm are shown in the top figure, while the corresponding western blots using eIF2α (L57A5) Mouse mAb #2103 (left panel) or Phospho-eIF2α (Ser51) (119A11) Rabbit mAb #3597 (right panel) are shown in the bottom figure.

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Important Ordering Details

Custom Ordering Details: Product is assembled to order. Please allow up to three business days for your order to be processed.

Supporting Data


Application Key:

  • W-Western
  • IP-Immunoprecipitation
  • IHC-Immunohistochemistry
  • ChIP-Chromatin Immunoprecipitation
  • IF-Immunofluorescence
  • F-Flow Cytometry
  • E-P-ELISA-Peptide

Species Cross-Reactivity Key:

  • H-Human
  • M-Mouse
  • R-Rat
  • Hm-Hamster
  • Mk-Monkey
  • Mi-Mink
  • C-Chicken
  • Dm-D. melanogaster
  • X-Xenopus
  • Z-Zebrafish
  • B-Bovine
  • Dg-Dog
  • Pg-Pig
  • Sc-S. cerevisiae
  • Ce-C. elegans
  • Hr-Horse
  • All-All Species Expected

Product Description

The PathScan® Phospho-eIF2α (Ser51) Sandwich ELISA Kit is a solid phase sandwich enzyme-linked immunosorbent assay (ELISA) that detects endogenous levels of eIF2α when phosphorylated at Ser51. A eIF2α rabbit antibody has been coated onto the microwells. After incubation with cell lysates, eIF2α protein (phospho and nonphospho) is captured by the coated antibody. Following extensive washing, a biotinylated phospho-eIF2α (Ser51) detection antibody is added to detect captured eIF2α protein phosphorylated at Ser51. HRP-linked streptavidin is then used to recognize the bound detection antibody. HRP substrate (TMB) is added to develop color. The magnitude of the absorbance for this developed color is proportional to the quantity of eIF2α phosphorylated at Ser51.

Specificity / Sensitivity

Phospho-eIF2α (Ser51) Sandwich ELISA Kit #7948 detects endogenous levels of eIF2α protein only when phosphorylated at Ser51 (see Figure 1). The kit sensitivity is shown in Figure 2.

This kit detects proteins from the indicated species, as determined through in-house testing, but may also detect homologous proteins from other species.


Phosphorylation of the eukaryotic initiation factor 2 (eIF2) α subunit is a well-documented mechanism to downregulate protein synthesis under a variety of stress conditions. eIF2 binds GTP and Met-tRNAi and transfers Met-tRNA to the 40S subunit to form the 43S preinitiation complex (1,2). eIF2 promotes a new round of translation initiation by exchanging GDP for GTP, a reaction catalyzed by eIF2B (1,2). Kinases that are activated by viral infection (PKR), endoplasmic reticulum stress (PERK/PEK), amino acid deprivation (GCN2), or heme deficiency (HRI) can phosphorylate the α subunit of eIF2 (3,4). This phosphorylation stabilizes the eIF2-GDP-eIF2B complex and inhibits the turnover of eIF2B. Induction of PKR by IFN-γ and TNF-α induces potent phosphorylation of eIF2α at Ser51 (5,6).

  1. Kimball, S.R. (1999) Int J Biochem Cell Biol 31, 25-9.
  2. de Haro, C. et al. (1996) FASEB J 10, 1378-87.
  3. Kaufman, R.J. (1999) Genes Dev 13, 1211-33.
  4. Sheikh, M.S. and Fornace, A.J. (1999) Oncogene 18, 6121-8.
  5. Cheshire, J.L. et al. (1999) J Biol Chem 274, 4801-6.
  6. Zamanian-Daryoush, M. et al. (2000) Mol Cell Biol 20, 1278-90.

Pathways & Proteins

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

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
PathScan is a trademark of Cell Signaling Technology, Inc.
U.S. Patent No. 7,429,487, foreign equivalents, and child patents deriving therefrom.