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  • Product Name
    Phospho-eIF2 alpha (Ser51)[Ser52] Antibody
  • Catalog No.
  • RRID
  • Source
  • Application
  • Reactivity
    Human, Mouse, Rat
  • Prediction
    Pig(100%), Bovine(100%), Horse(100%), Sheep(100%), Rabbit(100%), Dog(100%), Chicken(100%), Xenopus(100%)
  • UniProt
  • Mol.Wt
  • Concentration
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Product Information

Alternative Names:Expand▼

EIF 2 alpha; EIF 2; EIF 2A; EIF 2alpha; eIF-2-alpha; eIF-2A; EIF-2alpha; EIF2 alpha; EIF2; EIF2A; EIF2S1; Eukaryotic translation initiation factor 2 subunit 1 alpha 35kDa; Eukaryotic translation initiation factor 2 subunit 1 alpha; Eukaryotic translation initiation factor 2 subunit 1; Eukaryotic translation initiation factor 2 subunit alpha; IF2A_HUMAN;


WB 1:500-1:2000, IHC 1:50-1:500, IF/ICC 1:100-1:500, ELISA(peptide) 1:20000-1:40000
*The optimal dilutions should be determined by the end user.


Human, Mouse, Rat

Predicted Reactivity:

Pig(100%), Bovine(100%), Horse(100%), Sheep(100%), Rabbit(100%), Dog(100%), Chicken(100%), Xenopus(100%)






The antibody is from purified rabbit serum by affinity purification via sequential chromatography on phospho-peptide and non-phospho-peptide affinity columns.


Phospho-eIF2 alpha (Ser51) Antibody detects endogenous levels of eIF2 alpha only when phosphorylated at Ser52, which site historically referenced as Ser51.


Please cite this product as: Affinity Biosciences Cat# AF3087, RRID:AB_2834524.





Storage Condition and Buffer:

Rabbit IgG in phosphate buffered saline , pH 7.4, 150mM NaCl, 0.02% sodium azide and 50% glycerol.Store at -20 °C.Stable for 12 months from date of receipt.

Immunogen Information


A synthesized peptide derived from human eIF2 alpha around the phosphorylation site of Ser51.


>>Visit The Human Protein Atlas

Gene ID:

Gene Name:


Molecular Weight:

Observed Mol.Wt.: 38kD.
Predicted Mol.Wt.: 36kDa(Calculated)..

Subcellular Location:

Cytoplasmic granule. The cytoplasmic granules are stress granules which are a dense aggregation in the cytosol composed of proteins and RNAs that appear when the cell is under stress. Colocalizes with NANOS3 in the stress granules (By similarity).


eIF2A a translation initiation factor that functions in the early steps of protein synthesis by forming a ternary complex with GTP and initiator tRNA. This complex binds to a 40s ribosomal subunit, followed by mRNA binding to form a 43S preinitiation complex.


Research Background


Functions in the early steps of protein synthesis by forming a ternary complex with GTP and initiator tRNA. This complex binds to a 40S ribosomal subunit, followed by mRNA binding to form a 43S pre-initiation complex. Junction of the 60S ribosomal subunit to form the 80S initiation complex is preceded by hydrolysis of the GTP bound to eIF-2 and release of an eIF-2-GDP binary complex. In order for eIF-2 to recycle and catalyze another round of initiation, the GDP bound to eIF-2 must exchange with GTP by way of a reaction catalyzed by eIF-2B.

Post-translational Modifications:

Substrate for at least 4 kinases: EIF2AK1/HRI, EIF2AK2/PKR, EIF2AK3/PERK and EIF2AK4/GCN2. Phosphorylation stabilizes the eIF-2/GDP/eIF-2B complex and prevents GDP/GTP exchange reaction, thus impairing the recycling of eIF-2 between successive rounds of initiation and leading to global inhibition of translation. Phosphorylated; phosphorylation on Ser-52 by the EIF2AK4/GCN2 protein kinase occurs in response to amino acid starvation and UV irradiation (By similarity).

Subcellular Location:

Cytoplasm>Stress granule.
Note: Colocalizes with NANOS3 in the stress granules.

Extracellular region or secreted Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertionGraphics by Christian Stolte

Subunit Structure:

Heterotrimer composed of an alpha, a beta and a gamma chain. Component of an EIF2 complex at least composed of CELF1/CUGBP1, CALR, CALR3, EIF2S1, EIF2S2, HSP90B1 and HSPA5. Interaction with METAP2 protects EIF2S1 from inhibitory phosphorylation (By similarity). Interacts with ABCF1 isoform 2. Associates with ribosomes. Interacts with DDX3X in an RNA-independent manner.


Belongs to the eIF-2-alpha family.

Research Fields

Research Fields:

· Cellular Processes > Cell growth and death > Apoptosis.(View pathway)
· Cellular Processes > Transport and catabolism > Autophagy - animal.(View pathway)
· Genetic Information Processing > Folding, sorting and degradation > Protein processing in endoplasmic reticulum.(View pathway)
· Genetic Information Processing > Translation > RNA transport.
· Human Diseases > Infectious diseases: Viral > Herpes simplex infection.
· Human Diseases > Infectious diseases: Viral > Hepatitis C.
· Human Diseases > Infectious diseases: Viral > Measles.
· Human Diseases > Infectious diseases: Viral > Influenza A.
· Human Diseases > Endocrine and metabolic diseases > Non-alcoholic fatty liver disease (NAFLD).

WB Images(1)

IHC Images(20)

IF/ICC Images(2)

ELISA analysis of AF3087 showing specificity to Phospho-eIF2 alpha (Ser51)[Ser52] Blocking Peptide peptide. Peptides concentration: 1ug/ml.
P-peptide: phospho-peptide; N-peptide: non-phospho-peptide.

Reference Citations:

1). Cai Y et al. Betulinic acid chemosensitizes breast cancer by triggering ER stress-mediated apoptosis by directly targeting GRP78. Cell Death Dis 2018 May 25;9(6):636 (PubMed: 29802332) [IF=6.304]

Application: WB    Species:human;    Sample:MCF-7,MDA-MB-231

Fig. 5 BA triggers breast cancer cells apoptosis via ER stress-mediated pathway. a MCF-7 and MDA-MB-231 cells were treated with the indicated concentrations of BA for 24 h, and the protein levels of ER stress-associated signals were stimulated by BA in a dose-dependent manner, including GRP78, p-PERK/PERK, p-eIF2α/eIF2α, CHOP, and caspase-12. b MCF-7 and MDA-MB-231 cells were treated with BA alone or in combination with taxol for 24 h, the expression levels of GRP78, p-PERK/PERK, p-eIF2α/eIF2α, CHOP, and caspase-12 were also significantly upregulated following drug administration, especially in the co-treatment group, indicating the ER stress-mediated apoptosis pathway was aggravatedly activated by drug combination.

2). Zhao YS et al. Hydrogen and Oxygen Mixture to Improve Cardiac Dysfunction and Myocardial Pathological Changes Induced by Intermittent Hypoxia in Rats. Oxid Med Cell Longev 2019 Mar 7;2019:7415212 (PubMed: 30984338) [IF=5.076]

3). Liu Y et al. EndophilinA2 protects against angiotensin II-induced cardiac hypertrophy by inhibiting angiotensin II type 1 receptor trafficking in neonatal rat cardiomyocytes. J Cell Biochem 2018 Jun 20 (PubMed: 29923351) [IF=4.237]

4). Wu X et al. Protective Effect of Patchouli Alcohol Against High-Fat Diet Induced Hepatic Steatosis by Alleviating Endoplasmic Reticulum Stress and Regulating VLDL Metabolism in Rats. Front Pharmacol 2019 Oct 1;10:1134 (PubMed: 31632274) [IF=4.225]

5). Li F et al. Icariin improves the cognitive function of APP/PS1 mice via suppressing endoplasmic reticulum stress. Life Sci 2019 Aug 7:116739 (PubMed: 31400352) [IF=3.647]

6). Song Z et al. The protective role of the MKP-5-JNK/P38 pathway in glucolipotoxicity-induced islet β-cell dysfunction and apoptosis. Exp Cell Res 2019 Jun 13 (PubMed: 31202710) [IF=3.383]

7). Qiuli H et al. [EXPRESS] Endoplasmic reticulum stress promoting caspase signaling pathway dependent apoptosis contributes to bone cancer pain in the spinal dorsal horn. Mol Pain 2019 Aug 27:1744806919876150 (PubMed: 31452457)

8). Wu K et al. Antitumor effect of ginsenoside Rg3 on gallbladder cancer by inducing endoplasmic reticulum stress-mediated apoptosis in vitro and in vivo. Oncol Lett 2018 Nov;16(5):5687-5696 (PubMed: 30344724)

9). Zhang J et al. Inhibition of the SIRT1 signaling pathway exacerbates endoplasmic reticulum stress induced by renal ischemia/reperfusion injury in type 1 diabetic rats. Mol Med Rep 2020 Feb;21(2):695-704 (PubMed: 31974604)

10). Yuan Q;Xu T;Chen Y;Qu W;Sun D;Liu X;Sun L; et al. MiR-185-5p ameliorates endoplasmic reticulum stress and renal fibrosis by downregulation of ATF6. Lab Invest 2020 Jun 8. (PubMed: 32514126)

11). Li W;Xu X;Dong D;Lei T;Ou H; et al. Up-regulation of thioredoxin system by puerarin inhibits lipid uptake in macrophages. Free Radic Biol Med 2020 Nov 24;S0891-5849(20)31609-9. (PubMed: 33242606)

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Catalog Number :

(Blocking peptide available as AF3087-BP)

Price/Size :

Tips: For phospho antibody, we provide phospho peptide(0.5mg) and non-phospho peptide(0.5mg).

Function :

Blocking peptides are peptides that bind specifically to the target antibody and block antibody binding. These peptide usually contains the epitope recognized by the antibody. Antibodies bound to the blocking peptide no longer bind to the epitope on the target protein. This mechanism is useful when non-specific binding is an issue, for example, in Western blotting (immunoblot) and immunohistochemistry (IHC). By comparing the staining from the blocked antibody versus the antibody alone, one can see which staining is specific; Specific binding will be absent from the western blot or immunostaining performed with the neutralized antibody.

Format and storage :

Synthetic peptide was lyophilized with 100% acetonitrile and is supplied as a powder. Reconstitute with 0.1 ml DI water for a final concentration of 10 mg/ml.The purity is >90%,tested by HPLC and MS.Storage Maintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C.

Precautions :

This product is for research use only. Not for use in diagnostic or therapeutic procedures.

High similarity Medium similarity Low similarity No similarity
P05198 as Substrate
Site PTM Type Enzyme
S5 Phosphorylation
K12 Ubiquitination
S26 Phosphorylation
S49 Phosphorylation Q9NZJ5 (EIF2AK3) , Q9BQI3 (EIF2AK1) , P19525 (EIF2AK2) , Q75MR0 (HRI)
S52 Phosphorylation B4DS64 (PRKRIR) , P51812 (RPS6KA3) , P19525 (EIF2AK2) , P28482 (MAPK1) , Q75MR0 (HRI) , Q9BQI3 (EIF2AK1) , Q9NZJ5 (EIF2AK3) , Q05655 (PRKCD) , Q16539 (MAPK14) , Q9P2K8 (EIF2AK4)
S58 Phosphorylation
K61 Ubiquitination
K80 Ubiquitination
Y82 Phosphorylation
S86 Phosphorylation
K87 Ubiquitination
S91 Phosphorylation
K97 Ubiquitination
K101 Acetylation
K101 Ubiquitination
K104 Ubiquitination
K106 Ubiquitination
S110 Phosphorylation
K123 Ubiquitination
R133 Methylation
K141 Acetylation
K141 Ubiquitination
K143 Acetylation
K143 Ubiquitination
Y147 Phosphorylation
Y150 Phosphorylation
K154 Methylation
K154 Ubiquitination
S158 Phosphorylation
T185 Phosphorylation
K190 Ubiquitination
Y200 Phosphorylation
Y202 Phosphorylation
K209 Ubiquitination
S219 Phosphorylation
K226 Ubiquitination
Y235 Phosphorylation
T245 Phosphorylation
K259 Ubiquitination
K265 Ubiquitination
R266 Methylation
K276 Ubiquitination
T279 Phosphorylation
T281 Phosphorylation
T284 Phosphorylation
K312 Ubiquitination
IMPORTANT: For western blots, incubate membrane with diluted antibody in 5% w/v milk , 1X TBS, 0.1% Tween®20 at 4°C with gentle shaking, overnight.

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