Rabbit anti-Human XBP1 Polyclonal Antibody | anti-XBP1 antibody

XBP1, ID (XBP1, TREB5, XBP2, X-box-binding protein 1, Tax-responsive element-binding protein 5) (FITC)

Cat. Num. AAA6363910

• Gene Names: XBP1; XBP2; TREB5; XBP-1
• Reactivity: Human
• Applications: Flow Cytometry, Functional Assay, Immunohistochemistry, Western Blot
• Purity: Purified by Protein A Affinity Chromatography.
• Synonyms: XBP1; Polyclonal Antibody; ID (XBP1; TREB5; XBP2; X-box-binding protein 1; Tax-responsive element-binding protein 5) (FITC); Tax-responsive element-binding protein 5; anti-XBP1 antibody

• Host: Rabbit
• Reactivity: Human
• Clonality: Polyclonal
• Isotype: IgG
• Purity/Purification: Purified by Protein A Affinity Chromatography.
• Form/Format: Supplied as a liquid in PBS, pH 7.2. No preservative added. Labeled with Fluorescein Isothiocyanate (FITC).

• Applicable Applications for anti-XBP1 antibody: Flow Cytometry (FC/FACS), FLISA, Immunohistochemistry (IHC), Western Blot (WB)
• Application Notes: FC/FACS: 1:10-50; FLISA: 1:1,000; IHC: 1:50-100; WB: 1:100-500; Applications are based on unconjugated antibody.
• Immunogen: XBP1 antibody is generated from rabbits immunized with a KLH conjugated synthetic peptide between 70-100 amino acids from the Central region of human XBP1.
• Conjugate: FITC
• Note: Preservative Free
• Special Handling: Light sensitive
• Preparation and Storage: Store product at 4 degree C if to be used immediately within two weeks. For long-term storage, aliquot to avoid repeated freezing and thawing and store at -20 degree C. Aliquots are stable at -20 degree C for 12 months after receipt. Dilute required amount only prior to immediate use. Further dilutions can be made in assay buffer. Caution: FITC conjugates are sensitive to light. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

Western Blot (WB)

(Western blot analysis of XBP1 Antibody (Center) in Ramos cell line lysates (35ug/lane).XBP1 (arrow) was detected using the purified Pab.)

Immunohistochemistry (IHC)

(XBP1 Antibody (Center) IHC analysis in formalin fixed and paraffin embedded mouse kidney tissue followed by peroxidase conjugation of the secondary antibody and DAB staining. This data demonstrates the use of the XBP1 Antibody (Center) for immunohistochemistry. Clinical relevance has not been evaluated.)

Flow Cytometry (FC/FACS)

(XBP1 Antibody (Center) flow cytometric analysis of Ramos cells (right histogram) compared to a negative control cell (left histogram).FITC-conjugated goat-anti-rabbit secondary antibodies were used for the analysis.)

Western Blot (WB)

(Western blot analysis of XBP1 (arrow) using rabbit polyclonal XBP1 Antibody (Center). 293 cell lysates (2 ug/lane) either nontransfected (Lane 1) or transiently transfected (Lane 2) with the XBP1 gene.)

Related Product Information for anti-XBP1 antibody

XBP1 encodes a transcription factor that regulates MHC class II genes by binding to a promoter element referred to as an X box. This gene product is a bZIP protein, which was also identified as a cellular transcription factor that binds to an enhancer in the promoter of the T cell leukemia virus type 1 promoter. It may increase expression of viral proteins by acting as the DNA binding partner of a viral transactivator. It has been found that upon accumulation of unfolded proteins in the endoplasmic reticulum (ER), 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 (IRE1). The resulting loss of 26 nt from the spliced mRNA causes a frame-shift and an isoform XBP1(S), which is the functionally active transcription factor.

Product Categories/Family for anti-XBP1 antibody

Antibodies; Binding Proteins

References

Navon, A., et al. FEBS Lett. 584(1):67-73(2010). Guan, D., et al. Mol. Carcinog. 49(1):68-74(2010). del Pozo, N., et al. Hum. Immunol. 70(11):950-952(2009).

NCBI and Uniprot Product Information

• NCBI GI #: 47678753
• NCBI GeneID: 7494
• UniProt Accession #: P17861; Q8WYK6; Q969P1; Q96BD7
• Molecular Weight: 28,695 Da
• NCBI Official Full Name: XBP1
• NCBI Official Synonym Full Names: X-box binding protein 1
• NCBI Official Symbol: XBP1
• NCBI Official Synonym Symbols: XBP2; TREB5; XBP-1
• NCBI Protein Information: X-box-binding protein 1; tax-responsive element-binding protein 5
• UniProt Protein Name: X-box-binding protein 1
• Protein Family: X-box-binding protein
• UniProt Gene Name: XBP1
• UniProt Synonym Gene Names: TREB5; XBP2; XBP-1
• UniProt Entry Name: XBP1_HUMAN

NCBI Description

This gene encodes a transcription factor that regulates MHC class II genes by binding to a promoter element referred to as an X box. This gene product is a bZIP protein, which was also identified as a cellular transcription factor that binds to an enhancer in the promoter of the T cell leukemia virus type 1 promoter. It may increase expression of viral proteins by acting as the DNA binding partner of a viral transactivator. It has been found that upon accumulation of unfolded proteins in the endoplasmic reticulum (ER), 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 (IRE1). The resulting loss of 26 nt from the spliced mRNA causes a frame-shift and an isoform XBP1(S), which is the functionally active transcription factor. The isoform encoded by the unspliced mRNA, XBP1(U), is constitutively expressed, and thought to function as a negative feedback regulator of XBP1(S), which shuts off transcription of target genes during the recovery phase of ER stress. A pseudogene of XBP1 has been identified and localized to chromosome 5. [provided by RefSeq, Jul 2008]

Uniprot Description

XBP1: a transcription factor essential for hepatocyte growth, the differentiation of plasma cells, immunoglobulin secretion, and the unfolded protein response (UPR). XBP1 mRNA is spliced by IRE1 during the UPR to generate a new C-terminus, converting it into a potent unfolded-protein response transcriptional activator and triggering growth arrest and apoptosis. Only the spliced form of XBP1 can activate the UPR efficiently. Activates UPR target genes via direct binding to the UPR element (UPRE). Binds DNA preferably to the CRE-like element 5'-GATGACGTG[TG]N(3)[AT]T-3', and also to some TPA response elements (TRE). Binds to the HLA DR-alpha promoter. Binds to the Tax-responsive element (TRE) of HTLV-I. Up-regulated by ATF6 via direct binding to the ERSE in response to endoplasmic reticulum stress. Genetic variations in XBP1 could be associated with susceptibility to major affective disorder type 7 (MAFD7). Major affective disorders represent a class of mental disorders characterized by a disturbance in mood as their predominant feature. Two human isoforms are produced by alternative splicing. Isoform 1 is also known as XBP-1U. Isoform 2, also known as XBP-1S, is produced by IRE1 in response to endoplasmic reticulum stress. IRE1 cleaves a 26-bp fragment causing a frameshift of the mRNA transcript.

Protein type: Transcription factor; DNA-binding

Chromosomal Location of Human Ortholog: 22q12.1|22q12

Cellular Component: nucleoplasm; endoplasmic reticulum membrane; endoplasmic reticulum; cytoplasm; integral to membrane; integral to endoplasmic reticulum membrane; cytosol; nucleus

Molecular Function: protein binding; protein homodimerization activity; DNA binding; protease binding; chromatin DNA binding; protein heterodimerization activity; ubiquitin protein ligase binding; estrogen receptor binding; transcription factor activity; protein kinase binding

Biological Process: ubiquitin-dependent protein catabolic process; transcription from RNA polymerase II promoter; muscle development; phosphoinositide 3-kinase cascade; apoptosis; positive regulation of transcription of target genes involved in unfolded protein response; exocrine pancreas development; regulation of protein stability; negative regulation of transcription from RNA polymerase II promoter; cellular response to glucose starvation; protein transport; serotonin secretion, neurotransmission; positive regulation of MHC class II biosynthetic process; positive regulation of transcription factor import into nucleus; angiogenesis; cell growth; response to electrical stimulus; positive regulation of TOR signaling pathway; positive regulation of autophagy; fatty acid biosynthetic process; response to drug; positive regulation of histone methylation; protein destabilization; unfolded protein response; organelle organization and biogenesis; cellular response to nutrient; positive regulation of immunoglobulin secretion; liver development; positive regulation of immunoglobulin production; cholesterol homeostasis; unfolded protein response, activation of signaling protein activity; cellular protein metabolic process; cellular response to insulin stimulus; positive regulation of T cell differentiation; fatty acid homeostasis; endothelial cell proliferation; neuron development; positive regulation of fat cell differentiation; autophagy; positive regulation of B cell differentiation; positive regulation of transcription from RNA polymerase II promoter; immune response; positive regulation of protein amino acid phosphorylation; sterol homeostasis; vascular endothelial growth factor receptor signaling pathway; negative regulation of apoptosis

Disease: Major Affective Disorder 7