Mouse Monoclonal Antibody to XBP1

Mouse IgG1

MW: 28kDa
Enterez GeneID: 7494
General Information: 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.
Immunogen: Purified recombinant fragment of human XBP1 expressed in E. Coli.
Size and Concentration: 100ug/1mg/ml
Supplied As: Lyophilized Powder from 100ul of Ascitic fluid containing 0.03% sodium azide.
Reconstitution and Storage: Reconstituted with 100ul sterile DI H2O, at stored at 4C or -20C for short or long term storage.
Applications: ELISA: 1 to 10000; WB: 1 to 500 - 1 to 2000
References: 1. Chronobiol Int. 2007; 24(4):589-97. ; 2. Neurosci Lett. 2008 Apr 11; 435(1):30-3. ; 3. Virchows Arch. 2009 Apr; 454(4):467-74.