Phospho-eIF2α (S51)

Cat Number: ABP-0745
Conjugate: Unconjugated
Size: 100 ug
Clone: Poly
Concentration: 1mg/ml
Host: Rb
Isotype: IgG
Reactivity: Hu, Ms, Rt

Western blotting 1:500-1000 Immunoprecipitation: 1:50-1:100 Immunofluorescence: 1:50-1:200

Molecular: 38 kDa
Purification: Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding Ser51 of human eIF2alpha. Antibodies are purified by protein A and peptide affinity chromatography.

Phosphorylation of the eukaryotic initiation factor 2 (eIF2) a subunit is a well-documented mechanism to downregulate protein synthesis under a variety of stress conditions. Eukaryotic initiation factor 2 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 a subunit of eIF2 (3,4). This phosphorylation stabilizes the eIF2-GDP-eIF2B complex and inhibits the turnover of eIF2B. Induction of PKR by IFN-y and TNF-a induces potent phosphorylation of eIF2a at Ser51 (5,6).: Phospho-eIF2alpha (Ser51) Anti¬body detects endogenous eIF2alpha only when phosphory¬lated at Ser51. The antibody does not recognize elF2alpha phosphorylated at other sites.

Form: liquid
Buffer: Liquid in PBS containing 50% glycerol, 0.5% BSA and 0.02% sodium azide.
Storage: Store at –20°C. Avoid freeze / thaw cycles.

Western blot analysys of 293 cells Using Phospho-EIF2 (S51) Alpha Polyclonal antibody diluted at 1:1000


Western Blot analysys of lysates from K562 cells treated in IFN- alpha 1000ul/ml 18h, using EIF2 alpha (Phospho Ser51) Antibody. The lane on the right is blocked with the Phospho peptide.


1. Dilution of primary antibody: 1:1,000 2. Dilution of primary antibody: 1:500 Short Protocol: Phospho-EIF2a, cell lysis was loaded at 30ug/lane. Dilution at 1:500 and incubated at 4°C overnight. The secondary antibody was diluted at 1:10,000 and incubated at 37°C 1hour. Detection used: ECL West Pico Plus cat. ECL-2001. With other systems the researcher must optimize dilutions


Immunofluorescence analysis of rat-heart tissue. 1,eIF2α (phospho Ser51) Polyclonal Antibody(red) was diluted at 1 :200 (4°C,overnight). 2, Cy3 labled Secondary antibody was diluted at 1:300 (room temperature, 50min). 3. Picture B: DAPI(blue) 10min. Picture A:Target. Picture B: DAPI. Picture C: merge of A+B


Immunofluorescence analysis of HeLa cell 1,Eif2Alpha (phospho Ser51) Polyclonal Antibody (red) was diluted at 1:200 (4°C overnight. P53 monoclonal antibody (6C4) (green) was diluted at 1:200 (4°C overnight). 2, Goat Anti- Rabbit Alexa Fluor 594 diluted at 1:1000 room temperature, 50 min. Goat anti mouse Alexa Fluor 488 diluted at 1:1000 room temperature, 50 min.