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  • Product Name
    PERK Mouse mAb
  • Catalog No.
  • Source
  • Application
  • Reactivity
    Human, Mouse, Rat
  • UniProt
  • Mol.Wt
  • Concentration
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Product Information

Alternative Names:Expand▼

DKFZp781H1925; E2AK3_HUMAN; EC; Eif2ak3; Eukaryotic translation initiation factor 2 alpha kinase 3; Eukaryotic translation initiation factor 2-alpha kinase 3; Heme regulated EIF2 alpha kinase; HRI; HsPEK; Pancreatic eIF2 alpha kinase; Pancreatic eIF2-alpha kinase; PEK; PRKR like endoplasmic reticulum kinase; PRKR-like endoplasmic reticulum kinase; WRS;


WB 1:500-1:2000, IHC 1:50-1:200, IF/ICC 1:100-1:500
*The optimal dilutions should be determined by the end user.


Human, Mouse, Rat





Clone Number:





PERK Antibody detects endogenous levels of total PERK.





Storage Condition and Buffer:

Mouse IgG in phosphate buffered saline (without Mg2+ and Ca2+), 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 PERK.


>>Visit The Human Protein Atlas

Gene ID:

Gene Name:


Molecular Weight:

Observed Mol.Wt.: 120kD.
Predicted Mol.Wt.: 125kDa(Calculated)..

Tissue Specificity:

Ubiquitous. A high level expression is seen in secretory tissues.


Research Background


Metabolic-stress sensing protein kinase that phosphorylates the alpha subunit of eukaryotic translation initiation factor 2 (eIF-2-alpha/EIF2S1) on 'Ser-52' during the unfolded protein response (UPR) and in response to low amino acid availability. Converts phosphorylated eIF-2-alpha/EIF2S1 either in a global protein synthesis inhibitor, leading to a reduced overall utilization of amino acids, or to a translation initiation activator of specific mRNAs, such as the transcriptional activator ATF4, and hence allowing ATF4-mediated reprogramming of amino acid biosynthetic gene expression to alleviate nutrient depletion. Serves as a critical effector of unfolded protein response (UPR)-induced G1 growth arrest due to the loss of cyclin-D1 (CCND1). Involved in control of mitochondrial morphology and function.

Post-translational Modifications:

Oligomerization of the N-terminal ER luminal domain by ER stress promotes PERK trans-autophosphorylation of the C-terminal cytoplasmic kinase domain at multiple residues including Thr-982 on the kinase activation loop (By similarity). Autophosphorylated. Phosphorylated at Tyr-619 following endoplasmic reticulum stress, leading to activate its tyrosine-protein kinase activity. Dephosphorylated by PTPN1/TP1B, leading to inactivate its enzyme activity.


ADP-ribosylated by PARP16 upon ER stress, which increases kinase activity.

Subcellular Location:

Endoplasmic reticulum membrane>Single-pass type I membrane protein.

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

Tissue Specificity:

Ubiquitous. A high level expression is seen in secretory tissues.

Subunit Structure:

Forms dimers with HSPA5/BIP in resting cells (By similarity). Oligomerizes in ER-stressed cells (By similarity). Interacts with DNAJC3 and MFN2 (By similarity). Interacts with TMEM33. Interacts with PDIA6.


The lumenal domain senses perturbations in protein folding in the ER, probably through reversible interaction with HSPA5/BIP.

Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. GCN2 subfamily.

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Catalog Number :

(Blocking peptide available as BF8011-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.

Q9NZJ5 as Substrate
Site PTM Type Enzyme
T177 Phosphorylation
Y268 Phosphorylation
T441 Phosphorylation
S447 Phosphorylation
K452 Ubiquitination
S455 Phosphorylation
Y464 Phosphorylation
Y474 Phosphorylation
Y480 Phosphorylation
Y481 Phosphorylation
Y484 Phosphorylation
Y485 Phosphorylation
S555 Phosphorylation
T557 Phosphorylation
T561 Phosphorylation
S567 Phosphorylation
K581 Ubiquitination
Y585 Phosphorylation
Y619 Phosphorylation Q9NZJ5 (EIF2AK3)
K622 Ubiquitination
K669 Ubiquitination
S688 Phosphorylation
S694 Phosphorylation
T705 Phosphorylation
S715 Phosphorylation
S719 Phosphorylation
T802 Phosphorylation P31751 (AKT2) , P31749 (AKT1)
S803 Phosphorylation
S804 Phosphorylation
S811 Phosphorylation
S844 Phosphorylation
S845 Phosphorylation
S854 Phosphorylation
S856 Phosphorylation
T861 Phosphorylation
T862 Phosphorylation
T982 Phosphorylation
S1094 Phosphorylation
S1096 Phosphorylation
S1109 Phosphorylation
S1111 Phosphorylation
Q9NZJ5 as PTM Enzyme
Substrate Site Source
P05198 (EIF2S1) S49 Uniprot
P05198 (EIF2S1) S52 Uniprot
Q9BY44 (EIF2A) S265 Uniprot
Q9NZJ5 (EIF2AK3) Y619 Uniprot
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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