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You are here:Home » Antibodies » Antibodies-Translation Initiation Factors » Anti -Eukaryotic Translation Initiation Factor 2B, epsilon (eIF2B-e)

Anti -Eukaryotic Translation Initiation Factor 2B, epsilon (eIF2B-e)


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Clone Host Grade Applications
Polyclonal Rabbit Affinity Purified E B
Phosphorylation of the a subunit of eukaryotic initiation factor 2 is a well documented mechanism of down regulating protein synthesis under a variety of stress conditions. Eukaryotic initiation factor 2 binds GTP and Met-tRNAi and transfers the Met-tRNA to the 40S subunit to form the 43S preinitiation complex (1,2). For eIF2 to promote a new round of translation initiation, GDP must be exchanged for GTP, a reaction catalyzed by eIF2B (1,2). Kinases activated by viral infection (PKR), endoplasmic reticulum stress (PERK/PEK), amino acid deprivation (GCN2) and hemin deficiency (HRI) can phosphorylate the a subunit of eIF2 (3,4). This phosphorylation stabilizes the eIF2-GDP-eIF2B complex, inhibiting the turnover of eIF2B. Induction of PKR by IFN-g and TNF-a, or stress provoked by depletion of endoplasmic reticulum calcium levels, induces potent phosphorylation of eIF2a at Ser51 (5,6). eIF2B, a guanine nucleotide exchange factor, is composed of 5 subunits, the largest of which is eIF2B-e (7). Multiple in vivo phosphorylation sites have been identified on eIF2B-e (8). Casein Kinase II can phosphorylate eIF2B-e at Ser717/718 to allow for association with its substrate eIF2. Phosphorylation at Ser544 allows GSK-3 to phosphorylate the key regulatory site Ser540. A fifth eIF2B-e phosphorylation site, Ser466, can be phosphorylated by casein kinase I.
Catalog #E8949-20
ApplicationsSuitable for use in ELISA and Western Blot. Other applications not tested.
Recommended DilutionWestern Blot: 1:1000.
Optimal dilutions to be determined by the researcher.
Storage and StabilityMay be stored at 4°C for short-term only. For long-term storage, store at -20°C. Aliquots are stable for at least 12 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
Clone TypePolyclonal
ConcentrationNot determined
FormSupplied as a liquid in 10mM sodium HEPES, pH 7.5, 150mM NaCl, 0.1mg/ml BSA and 50% glycerol.
PurityPurified by Protein A and immunoaffinity chromatography.
ImmunogenSynthetic peptide corresponding to amino acids near the middle of human eIF2B-e (KLH). MW: 85kD.
SpecificityRecognizes human endogenous levels of total eIF2B-e protein. Species Crossreactivity: Mouse, rat and monkey.
Important NoteThis product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.

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