Product: ERN1 Antibody
Catalog: BF0223
Description: Mouse monoclonal antibody to ERN1
Application: WB IHC ELISA
Reactivity: Human
Mol.Wt.: 109kDa; 110kD(Calculated).
Uniprot: O75460
RRID: AB_2833775

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Product Info

ELISA 1:10000, WB 1:500-1:2000, IHC 1:200-1:1000
*The optimal dilutions should be determined by the end user.

WB: For western blot detection of denatured protein samples. IHC: For immunohistochemical detection of paraffin sections (IHC-p) or frozen sections (IHC-f) of tissue samples. IF/ICC: For immunofluorescence detection of cell samples. ELISA(peptide): For ELISA detection of antigenic peptide.

Monoclonal [AFB1751]
ERN1 antibody detects endogenous levels of total ERN1.
Cite Format: Affinity Biosciences Cat# BF0223, RRID:AB_2833775.
Mouse IgG1 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.


Endoplasmic reticulum (ER) to nucleus signalling 1; Endoplasmic reticulum to nucleus signaling 1; Endoplasmic reticulum-to-nucleus signaling 1; Endoribonuclease; ER to nucleus signaling 1; ERN 1; Ern1; ERN1_HUMAN; hIRE 1p; hIRE1p; Inositol requiring 1; Inositol requiring 1, S. cerevisiae, homolog of; Inositol requiring enzyme 1, S. cerevisiae, homolog of; Inositol requiring protein 1; inositol-requiring enzyme 1; Inositol-requiring protein 1; IRE 1; IRE 1a; IRE 1P; Ire1 alpha; Ire1-alpha; IRE1a; Ire1alpha; IRE1P; MGC163277; MGC163279; Protein kinase/endoribonuclease; RGD1559716; Serine/threonine protein kinase/endoribonuclease IRE1;



Purified recombinant fragment of human ERN1 expressed in E. Coli.

O75460 ERN1_HUMAN:

Ubiquitously expressed. High levels observed in pancreatic tissue.

The protein encoded by this gene is the ER to nucleus signalling 1 protein, a human homologue of the yeast Ire1 gene product. This protein possesses intrinsic kinase activity and an endoribonuclease activity and it is important in altering gene expression as a response to endoplasmic reticulum-based stress signals.

PTMs - O75460 As Substrate

Site PTM Type Enzyme
T49 Phosphorylation
K88 Ubiquitination
K95 Ubiquitination
T132 Phosphorylation
Y161 Phosphorylation
Y166 Phosphorylation
Y179 Phosphorylation
T283 Phosphorylation
Y289 Phosphorylation
K374 Acetylation
K374 Ubiquitination
K485 Ubiquitination
S533 Phosphorylation
S536 Phosphorylation
S544 Phosphorylation
S548 Phosphorylation
S551 Phosphorylation
Y628 Phosphorylation O75460 (ERN1)
K633 Ubiquitination
K706 Ubiquitination
S724 Phosphorylation O75460 (ERN1)
S726 Phosphorylation
S729 Phosphorylation
K851 Ubiquitination
K860 Ubiquitination
T973 Phosphorylation

PTMs - O75460 As Enzyme

Substrate Site Source
O75460 (ERN1) Y628 Uniprot
O75460 (ERN1) S724 Uniprot

Research Backgrounds


Serine/threonine-protein kinase and endoribonuclease that acts as a key sensor for the endoplasmic reticulum unfolded protein response (UPR). In unstressed cells, the endoplasmic reticulum luminal domain is maintained in its inactive monomeric state by binding to the endoplasmic reticulum chaperone HSPA5/BiP. Accumulation of misfolded protein in the endoplasmic reticulum causes release of HSPA5/BiP, allowing the luminal domain to homodimerize, promoting autophosphorylation of the kinase domain and subsequent activation of the endoribonuclease activity. The endoribonuclease activity is specific for XBP1 mRNA and excises 26 nucleotides from XBP1 mRNA. The resulting spliced transcript of XBP1 encodes a transcriptional activator protein that up-regulates expression of UPR target genes. Acts as an upstream signal for ER stress-induced GORASP2-mediated unconventional (ER/Golgi-independent) trafficking of CFTR to cell membrane by modulating the expression and localization of SEC16A.


Autophosphorylated following homodimerization. Autophosphorylation promotes activation of the endoribonuclease domain.

ADP-ribosylated by PARP16 upon ER stress, which increases both kinase and endonuclease activities.

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 assertionSubcellular location
Tissue Specificity:

Ubiquitously expressed. High levels observed in pancreatic tissue.

Subunit Structure:

Monomer. Homodimer; disulfide-linked; homodimerization takes place in response to endoplasmic reticulum stress and promotes activation of the kinase and endoribonuclease activities. Dimer formation is driven by hydrophobic interactions within the N-terminal luminal domains and stabilized by disulfide bridges. Interacts (via the luminal region) with DNAJB9/ERdj4; interaction takes place in unstressed cells and promotes recruitment of HSPA5/BiP. Interacts (via the luminal region) with HSPA5/BiP; HSPA5/BiP is a negative regulator of the unfolded protein response (UPR) that prevents homodimerization of ERN1/IRE1 and subsequent activation of the protein. Interacts with PDIA6, a negative regulator of the UPR; the interaction is direct and disrupts homodimerization. Interacts with DAB2IP (via PH domain); the interaction occurs in a endoplasmic reticulum stress-induced dependent manner and is required for subsequent recruitment of TRAF2 to ERN1/IRE1 (By similarity). Interacts with TAOK3 and TRAF2. Interacts with RNF13.


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

Restrictive clause


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