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  • KD/KO Validated

XBP1S/XBP1U Polyclonal antibody

XBP1S/XBP1U Polyclonal Antibody for IHC, WB, ELISA

Host / Isotype

Rabbit / IgG


human, mouse





Cat no : 24168-1-AP


TREB5, X box binding protein 1, XBP 1, XBP1, XBP1s, XBP1S/XBP1U, XBP1U, XBP2

Tested Applications

Positive WB detected inHepG2 cells, HEK-293 cells, Jurkat cells, Raji cells
Positive IHC detected inhuman breast cancer tissue, mouse liver tissue, human colon cancer tissue, human liver cancer tissue
Note: suggested antigen retrieval with TE buffer pH 9.0; (*) Alternatively, antigen retrieval may be performed with citrate buffer pH 6.0

Recommended dilution

Western Blot (WB)WB : 1:1000-1:5000
Immunohistochemistry (IHC)IHC : 1:50-1:500
Sample-dependent, check data in validation data gallery

Product Information

The immunogen of 24168-1-AP is XBP1S/XBP1U Fusion Protein expressed in E. coli.

Tested Reactivity human, mouse
Cited Reactivityhuman, mouse
Host / Isotype Rabbit / IgG
Class Polyclonal
Type Antibody
Immunogen XBP1S/XBP1U fusion protein Ag21454
Full Name X-box binding protein 1
Calculated molecular weight 261 aa, 29 kDa
Observed molecular weight ~32 kDa; ~60 kDa
GenBank accession numberBC000938
Gene symbol XBP1
Gene ID (NCBI) 7494
Conjugate Unconjugated
Form Liquid
Purification Method Antigen Affinity purified
Storage Buffer PBS with 0.02% sodium azide and 50% glycerol pH 7.3.
Storage ConditionsStore at -20°C. Stable for one year after shipment. Aliquoting is unnecessary for -20oC storage. 20ul sizes contain 0.1% BSA.

Background Information

XBP1 is also named as XBP2, belongs to the bZIP family. The X-box-binding protein-1 (XBP1) is a transcriptional regulator of the ER stress response that lies downstream of inositol-requiring enzyme 1 (IRE1α) activation (PMID: 14559994). IRE1α possesses both kinase and ribonuclease activity and processes XBP1 mRNA to produce an active transcription factor in response to ER stress (PMID: 11779464, 11780124). It has been found that upon accumulation of unfolded proteins in the endoplasmic reticulum, the mRNA of this gene is processed to an active form by an unconventional splicing mechanism that is mediated by the endonuclease inositol-requiring enzyme 1. The resulting loss of 26 nt from the spliced mRNA causes a frame-shift and an isoform XBP1S, which is the functionally active transcription factor. The isoform encoded by the unspliced mRNA, XBP1U, is constitutively expressed, and thought to function as a negative feedback regulator of XBP1S, which shuts off transcription of target genes during the recovery phase of ER stress (PMID: 11850408). The unspliced XBP1U isoform is composed of 261 amino acid residues, and the spliced XBP1S isoform is composed of 376 amino acid residues. The XBP1 antibody (24168-1-AP) can detect both XBP1U and XBP1S.


Product Specific Protocols
WB protocol for XBP1S/XBP1U antibody 24168-1-APDownload protocol
IHC protocol for XBP1S/XBP1U antibody 24168-1-APDownload protocol
Standard Protocols
Click here to view our Standard Protocols



Bioorg Chem

Dihydroartemisinin alleviates steatosis and inflammation in nonalcoholic steatohepatitis by decreasing endoplasmic reticulum stress and oxidative stress.

Authors - Tongxi Li

J Virol

Inositol requiring enzyme 1α promotes Zika virus infection through regulating stearoyl-CoA desaturase 1 mediated lipid metabolism.

Authors - Yanxia Huang
  • KD Validated

J Zhejiang Univ Sci B

Endoplasmic reticulum stress is involved in retinal injury induced by repeated transient spikes of intraocular pressure

Authors - Xue YANG

Cell Death Discov

24(S)-Hydroxycholesterol induces ER dysfunction-mediated unconventional cell death.

Authors - Yasuomi Urano

J Exp Clin Cancer Res

Calreticulin promotes EMT in pancreatic cancer via mediating Ca2+ dependent acute and chronic endoplasmic reticulum stress.

Authors - Weiwei Sheng

ACS Appl Mater Interfaces

Probiotic-Functionalized Silk Fibroin/Sodium Alginate Scaffolds with Endoplasmic Reticulum Stress-Relieving Properties for Promoted Scarless Wound Healing

Authors - Zhaona Dou


The reviews below have been submitted by verified Proteintech customers who received an incentive forproviding their feedback.


Carly (Verified Customer) (09-27-2019)

Used in an antibody array to identify proteins in human EDTA plasma.

  • Applications: Other,