Product Details

Uniprot No.

P19525

Target Names

Alternative Names

Double stranded RNA activated protein kinase antibody; E2AK2_HUMAN antibody; eIF-2A protein kinase 2 antibody; EIF2AK1 antibody; EIF2AK2 antibody; Eukaryotic translation initiation factor 2 alpha kinase 2 antibody; Eukaryotic translation initiation factor 2-alpha kinase 2 antibody; HGNC:9437 antibody; Interferon induced double stranded RNA activated protein kinase antibody; Interferon inducible elF2 alpha kinase antibody; Interferon inducible RNA dependent protein kinase antibody; Interferon-induced; double-stranded RNA-activated protein kinase antibody; Interferon-inducible RNA-dependent protein kinase antibody; MGC126524 antibody; P1/eIF-2A protein kinase antibody; P1/eIF2A protein kinase antibody; p68 kinase antibody; PKR antibody; PPP1R83 antibody; PRKR antibody; Protein kinase interferon inducible double stranded RNA dependent antibody; Protein kinase RNA activated antibody; Protein kinase RNA-activated antibody; Protein phosphatase 1 regulatory subunit 83 antibody; Serine/threonine protein kinase TIK antibody; Tyrosine protein kinase EIF2AK2 antibody

Species Reactivity

Human

Immunogen

A synthesized peptide derived from Human Phospho-EIF2AK2 (T446)

Immunogen Species

Homo sapiens (Human)

Conjugate

Non-conjugated

Clonality

Monoclonal

Isotype

Rabbit IgG

Clone No.

2F8

Purification Method

Affinity-chromatography

Concentration

It differs from different batches. Please contact us to confirm it.

Buffer

Rabbit IgG in 10mM phosphate buffered saline , pH 7.4, 150mM sodium chloride, 0.05% BSA, 0.02% sodium azide and 50% glycerol.

Form

Liquid

Tested Applications

ELISA, WB, IHC, IF

Recommended Dilution

Application	Recommended Dilution
WB	1:500-1:5000
IHC	1:50-1:200
IF	1:20-1:200

Protocols

ELISA Protocol
Western Blotting(WB) Protocol
Immunohistochemistry (IHC) Protocol
Immunofluorescence (IF) Protocol

Troubleshooting and FAQs

Antibody FAQs

Storage

Upon receipt, store at -20°C or -80°C. Avoid repeated freeze.

Lead Time

Basically, we can dispatch the products out in 1-3 working days after receiving your orders. Delivery time maybe differs from different purchasing way or location, please kindly consult your local distributors for specific delivery time.

Description

EIF2AK2, commonly known as Protein Kinase R (PKR), serves as a critical sentinel in cellular defense against viral infection and plays essential roles in stress response signaling. This interferon-induced kinase becomes activated upon binding double-stranded RNA, triggering phosphorylation cascades that regulate protein synthesis and inflammatory responses. Phosphorylation at threonine 446 represents a key activation marker, making its detection valuable for researchers investigating innate immunity, viral pathogenesis, and stress-induced translational control.

This recombinant monoclonal antibody, clone 2F8, offers the reproducibility and consistency that phospho-specific detection demands. Generated against a synthetic phosphopeptide corresponding to the human Phospho-EIF2AK2 (T446) region, the antibody is produced using recombinant technology, ensuring sequence-defined specificity and eliminating the lot-to-lot variability that can compromise longitudinal studies of kinase activation.

Validation across multiple platforms demonstrates versatility for diverse experimental workflows. Western blot analysis in HeLa whole cell lysates, comparing Calyculin A-treated and untreated conditions, confirms detection of the expected 62 kDa band, with the phosphatase inhibitor treatment providing a useful positive control strategy for researchers establishing this assay. Immunohistochemistry staining has been validated in paraffin-embedded human kidney tissue using citrate buffer antigen retrieval, while immunofluorescence applications have been confirmed in Calyculin A-treated HeLa cells, revealing subcellular localization patterns of activated PKR.

The antibody is supplied in a glycerol-containing buffer optimized for long-term stability at -20°C or -80°C. For researchers exploring signal transduction pathways, antiviral responses, or translational regulation mechanisms, this phospho-specific antibody provides a reliable tool for monitoring PKR activation status across biochemical and imaging applications.

Usage

For Research Use Only. Not for use in diagnostic or therapeutic procedures.

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Target Background

Function

IFN-induced dsRNA-dependent serine/threonine-protein kinase that phosphorylates the alpha subunit of eukaryotic translation initiation factor 2 (EIF2S1/eIF-2-alpha) and plays a key role in the innate immune response to viral infection. Inhibits viral replication via the integrated stress response (ISR): EIF2S1/eIF-2-alpha phosphorylation in response to viral infection converts EIF2S1/eIF-2-alpha in a global protein synthesis inhibitor, resulting to a shutdown of cellular and viral protein synthesis, while concomitantly initiating the preferential translation of ISR-specific mRNAs, such as the transcriptional activator ATF4. Exerts its antiviral activity on a wide range of DNA and RNA viruses including hepatitis C virus (HCV), hepatitis B virus (HBV), measles virus (MV) and herpes simplex virus 1 (HHV-1). Also involved in the regulation of signal transduction, apoptosis, cell proliferation and differentiation: phosphorylates other substrates including p53/TP53, PPP2R5A, DHX9, ILF3, IRS1 and the HHV-1 viral protein US11. In addition to serine/threonine-protein kinase activity, also has tyrosine-protein kinase activity and phosphorylates CDK1 at 'Tyr-4' upon DNA damage, facilitating its ubiquitination and proteosomal degradation. Either as an adapter protein and/or via its kinase activity, can regulate various signaling pathways (p38 MAP kinase, NF-kappa-B and insulin signaling pathways) and transcription factors (JUN, STAT1, STAT3, IRF1, ATF3) involved in the expression of genes encoding proinflammatory cytokines and IFNs. Activates the NF-kappa-B pathway via interaction with IKBKB and TRAF family of proteins and activates the p38 MAP kinase pathway via interaction with MAP2K6. Can act as both a positive and negative regulator of the insulin signaling pathway (ISP). Negatively regulates ISP by inducing the inhibitory phosphorylation of insulin receptor substrate 1 (IRS1) at 'Ser-312' and positively regulates ISP via phosphorylation of PPP2R5A which activates FOXO1, which in turn up-regulates the expression of insulin receptor substrate 2 (IRS2). Can regulate NLRP3 inflammasome assembly and the activation of NLRP3, NLRP1, AIM2 and NLRC4 inflammasomes. Plays a role in the regulation of the cytoskeleton by binding to gelsolin (GSN), sequestering the protein in an inactive conformation away from actin.

Gene References into Functions

We demonstrated the activation of PKR pathway in CADASIL PMID: 30073405
These results establish that PKR regulation through stress-induced TRBP phosphorylation is an important mechanism ensuring cellular recovery and preventing apoptosis due to sustained PKR activation. PMID: 29348664
Auto-phosphorylation represses PKR activity. PMID: 28281686
The finding that zebularine upregulates CYP gene expression through DNMT1 and PKR modulation sheds light on the mechanisms controlling hepatocyte function and thus may aid in the development of new in-vitro systems using high-functioning hepatocytes PMID: 28112215
Multiples studies identified PKR as a crucial component of the host defense mechanism against viruses. The dynamic nature of PKR's structure allows it to interact with viral and many cellular molecules that ultimately affect the function of target molecules and downstream components of their pathways. [review] PMID: 29716441
High PKR expression is associated with Colorectal Cancer Cell Invasiveness. PMID: 30275201
The data demonstrate that E3 promotes F1 expression by blocking activation of the double-stranded RNA-activated protein kinase R (PKR). PMID: 29997208
findings indicate that MSI1 plays a leading role in stress granule formation that grants cancer stem cell properties and chemoresistant stress granules in GBM, in response to stressful conditions via the PKR/eIF2alpha signalling cascade. PMID: 29486283
Here, the authors report that LRP16 selectively interacts and activates double-stranded RNA-dependent kinase (PKR), and also acts as scaffolds to assist the formation of a ternary complex of PKR and IKKbeta, prolonging the polymers of ADP-ribose (PAR)-dependent nuclear factor kappa B (NF-kappaB) transactivation caused by DNA-damaging agents and confers acquired chemoresistance. PMID: 28820388
These data suggest that even a modest increase in expression of this weak PKR antagonist is sufficient to enable RhCMV replication in human cells. PMID: 29263260
Activation of PKR by TNF-alpha mRNA element enables PKR phosphorylation. PKR phosphorylation on Ser51 is necessary and sufficient for efficient splicing of TNF-alpha mRNA. PMID: 28683312
PKR is co-opted by EV-A71 via viral protease 3C-mediated proteolytic activation to facilitate viral replication. PMID: 28702377
Findings suggest a novel role for PKR in lung cancer cells as a mediator of radiation resistance possibly through translocation of the protein product to the nucleus. PMID: 27203671
a novel, positive role for PKR activation and eIF2alpha phosphorylation in human globin mRNA splicing, is reported. PMID: 28374749
Clustered regularly interspaced short palindromic repeat (CRISPR)/Cas9-mediated ablation of double-stranded RNA (dsRNA)-activated protein kinase R (PKR) restored p53 responses while boosting hepatitis C virus replication, showing that p53 inhibition results directly from viral activation of PKR. PMID: 28442604
Gene silencing studies showed that the suppression of immunoproteasome induction is essentially dependent on protein kinase R (PKR). Indeed, the generation of a strictly immunoproteasome-dependent cytotoxic T lymphocyte epitope was impaired in in vitro processing experiments using isolated 20S proteasomes from HCV-infected cells and was restored by the silencing of PKR expression. PMID: 27833096
data provide the first evidence that KSHV ORF57 plays a role in modulating PKR/eIF2alpha/SG axis and enhances virus production during virus lytic infection. PMID: 29084250
The PKR is a key constituent of the metaflammasome and interacts directly with several inflammatory kinases, such as inhibitor kappaB (IkappaB) kinase (IKK) and c-Jun N-terminal kinase (JNK), insulin receptor substrate 1 (IRS1), and component of the translational machinery such as eIF2alpha. PMID: 26831644
infection with New World arenaviruses JUNV and MACV, but not OW LASV, activated PKR, concomitant with elevated phosphorylation of the translation initiation factor alpha subunit of eukaryotic initiation factor 2 PMID: 28794024
The stem-loop of noncoding RNA 886 is structural feature not only critical for inhibiting PKR autophosphorylation, but also the phosphorylation of its cellular substrate, EIF-2alpha. PMID: 28069888
Protein kinase R (PKR) was required for induction of stress granules (SGs) by mumps virus (MuV) infection and regulated type III IFN (IFN-lambda1) mRNA stability. PMID: 27560627
data establish a model in which the Influenza A virus NS1 N-terminal domain engages in a binding interaction to inhibit activation of PKR and ensure efficient viral propagation and virulence PMID: 28250123
It was established in this report that interactions between PACT, ADAR1 and HIV-1-encoded Tat protein diminish the activation of PKR in response to HIV-1 infection. PMID: 28167698
In insulitic islets from living patients with recent-onset T1D, most of the overexpressed ISGs, including GBP1, TLR3, OAS1, EIF2AK2, HLA-E, IFI6, and STAT1, showed higher expression in the islet core compared with the peri-islet area containing the surrounding immune cells PMID: 27422384
NF90 exerts its antiviral activity by antagonizing the inhibitory role of NS1 on PKR phosphorylation PMID: 27423063
Crucially, Chlamydia trachomatis infection resulted in robust IRE1alpha RNAse activity that was dependent on TLR4 signalling and inhibition of IRE1alpha RNAse activity prevented PKR activation. PMID: 27021640
the expression of a Tat construct containing mutations in the basic region (49-57aa), which is responsible for the interaction with PKR, favored neither parasite growth nor IL-10 expression in infected macrophages. PMID: 26608746
This study provides insight into the molecular pathology of Cornelia de Lange syndrome by establishing a relationship between NIPBL and HDAC8 mutations and PKR activation. PMID: 26725122
The Newcastle disease virus-induced translation shutoff at late infection times was attributed to sustaining phosphorylation of eIF2a, which is mediated by continual activation of PKR and degradation of PP1. PMID: 26869028
The sole essential function of cytomegalovirus TRS1 is to antagonize host PKR. PMID: 26716879
results show that ceramide acts at two distinct levels of the insulin signaling pathway (IRS1 and Akt). PKR, which is induced by both inflammation signals and ceramide, could play a major role in the development of insulin resistance in muscle cells. PMID: 26698173
Classical swine fever virus (CSFV) infection increased the phosphorylation of eukaryotic translation initiation factor (eIF)2alpha and its kinase PKR. The activation of PKR during CSFV infection is beneficial to the virus. PMID: 25899421
these data indicate a pivotal role for PKR's protein-binding function on the proliferation of pancreatic beta cells through TRAF2/RIP1/NF-kappaB/c-Myc pathways. PMID: 25715336
The results from this study indicate an important role of RAX/PKR association in regulating PKR activity as well as ethanol neurotoxicity PMID: 25592072
The G3BP1-Caprin1-PKR complex represents a new mode of PKR activation and is important for antiviral activity of G3BP1 and PKR during infection with mengovirus. PMID: 25784705
The data support a model in which activating RNAs induce formation of a back-to-back parallel PKR kinase dimer whereas nonactivating RNAs either fail to induce dimerization or produce an alternative, inactive dimer configuration. PMID: 26488609
Tyrosine phosphorylated EIF2AK2 plays a role in the regulation of insulin induced protein synthesis and in maintaining insulin sensitivity. PMID: 26321373
PKR expression correlates with inferior survival and shorter remission duration for acute myeloid leukemia patients. PMID: 26202421
No significant association was determined between the rs2254958 EIF2AK2 polymorphism and the development of IBD, or clinical outcome. PMID: 25607115
the affinity of PACT-PACT and PACT-PKR interactions is enhanced in dystonia patient lymphoblasts, thereby leading to intensified PKR activation and enhanced cellular death. PMID: 26231208
Protein levels of PRKR were significantly increased in prefrontal cortex in chronic excessive alcohol use. PMID: 25704249
Mechanism by which PK2 inhibits the model eIF2alpha kinase human RNA-dependent protein kinase (PKR) as well as native insect eIF2alpha kinases, is reported. PMID: 26216977
G3BP1, G3BP2 and CAPRIN1 are required for translation of interferon stimulated mRNAs and are targeted by a dengue virus non-coding RNA. PMID: 24992036
This study demonstrates that two interferon stimulated genes, i.e. PKR and ADAR1 have opposite effects on HTLV replication in vivo. PMID: 25389016
PKR directly interacts with HIV-1 Tat and phosphorylates the first exon of Tat exclusively at five Ser/Thr residues, which inhibits Tat-mediated provirus transcription. PMID: 25653431
Authors show that the PXXP domain within G3BP1 is essential for the recruitment of PKR to stress granules, for eIF2alpha phosphorylation driven by PKR, and for nucleating stress granules of normal composition. PMID: 25520508
Further studies revealed that Andes virus nucleocapsid protein inhibited PKR dimerization, a critical step required for PKR autophosphorylation to attain activity. PMID: 25410857
SUMO potentiates the inhibition of protein synthesis induced by PKR in response to dsRNA. PMID: 25074923
Early dsRNA induced transient activation of the cellular dsRNA sensor protein kinase R (PKR), resulting in enhanced production of interferons and cytokines in cells and mice. PMID: 25297997
Cyclophilin inhibitors reduce phosphorylation of PKR and eIF2alpha during HCV infection to allow for translation of ISG products. PMID: 24786893

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Subcellular Location

Cytoplasm. Nucleus. Cytoplasm, perinuclear region.

Protein Families

Protein kinase superfamily, Ser/Thr protein kinase family, GCN2 subfamily

Tissue Specificity

Highly expressed in thymus, spleen and bone marrow compared to non-hematopoietic tissues such as small intestine, liver, or kidney tissues. Colocalizes with GSK3B and TAU in the Alzheimer disease (AD) brain. Elevated levels seen in breast and colon carcin

Database Links

HGNC: 9437

OMIM: 176871

KEGG: hsa:5610

STRING: 9606.ENSP00000233057

UniGene: Hs.131431

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Code	CSB-RA007511A446phHU
Size	US$210
	Order now
Image	Western Blot Positive WB detected in: Hela treated with Calyculin A whole cell lysate(30µg), Hela whole cell lysate(30µg) All lanes: EIF2AK2 antibody at 1:1000 Secondary Goat polyclonal to rabbit IgG at 1/40000 dilution Predicted band size: 62 kDa Observed band size: 62 kDa Exposure time: 120s IHC image of CSB-RA007511A446phHU diluted at 1:50 and staining in paraffin-embedded human brain tissue performed on a Leica BondTM system. After dewaxing and hydration, antigen retrieval was mediated by high pressure in a citrate buffer (pH 6.0). Section was blocked with 10% normal goat serum 30min at RT. Then primary antibody (1% BSA) was incubated at 4°C overnight. The primary is detected by a Goat anti-rabbit polymer IgG labeled by HRP and visualized using 0.05% DAB. Secondary antibody only control: uses 1% BSA instead of primary antibody IHC image of CSB-RA007511A446phHU diluted at 1:50 and staining in paraffin-embedded human kidney tissue performed on a Leica BondTM system. After dewaxing and hydration, antigen retrieval was mediated by high pressure in a citrate buffer (pH 6.0). Section was blocked with 10% normal goat serum 30min at RT. Then primary antibody (1% BSA) was incubated at 4°C overnight. The primary is detected by a Goat anti-rabbit polymer IgG labeled by HRP and visualized using 0.05% DAB. Secondary antibody only control: uses 1% BSA instead of primary antibody IHC image of CSB-RA007511A446phHU diluted at 1:50 and staining in paraffin-embedded human ovarian cancer performed on a Leica BondTM system. After dewaxing and hydration, antigen retrieval was mediated by high pressure in a citrate buffer (pH 6.0). Section was blocked with 10% normal goat serum 30min at RT. Then primary antibody (1% BSA) was incubated at 4°C overnight. The primary is detected by a Goat anti-rabbit polymer IgG labeled by HRP and visualized using 0.05% DAB. Secondary antibody only control: uses 1% BSA instead of primary antibody Immunofluorescence staining of Hela cell treated with Calyculin A with CSB-RA007511A446phHU at 1:20, counter-stained with DAPI. The cells were fixed in 4% formaldehyde and and permeated by 0.2% TritonX-100 for 15 min. Then 10% normal goat serum to block non-specific protein-protein interactions . The cells were then incubated with the antibody overnight at 4℃. The secondary antibody was Alexa Fluor 488-congugated AffiniPure Goat Anti-Rabbit IgG(H+L). Immunofluorescence staining of Hela cell with 5% goat serum, counter-stained with DAPI. The cells were fixed in 4% formaldehyde and blocked in 10% normal Goat Serum. The cells were then incubated with the antibody overnight at 4C. The secondary antibody was Alexa Fluor 488-congugated AffiniPure Goat Anti-Rabbit IgG(H+L).
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Phospho-EIF2AK2 (T446) Recombinant Monoclonal Antibody

Product Details

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Target Background