• Species Reactivity

  Human

• Specificity

  Detects human XBP1 (S Isoform) (XBP1S) in direct ELISAs. This segment is found only in the XBP1S (spliced) variant. Does not detect XBP1U (unspliced).

• Source

  Monoclonal Mouse IgG1 Clone # 525904

• Immunogen

  E. coli-derived recombinant human XBP1S    
  Ser188-Leu287    
  Accession # NP_001073007

• Formulation

  Supplied 0.2 mg/mL in a saline solution containing BSA and Sodium Azide.

• Label

  Alexa Fluor 750

Applications

• Recommended    
  Concentration

  Sample

• Intracellular Staining by Flow Cytometry

  0.25-1 µg/10    ⁶ cells

  RPMI 8226 human multiple myeloma cell line fixed with paraformaldehyde and permeabilized with saponin

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Please Note: Optimal dilutions should be determined by each laboratory for each application.  are available in the Technical Information section on our website.

Preparation and Storage

• Shipping

  The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.

• Stability & Storage

  Store the unopened product at 2 - 8 °C. Do not use past expiration date.

Background: XBP1

X-box binding protein 1 (XBP1; also tax-responsive element-binding protein 5 (TREB5) is a ubiquitously expressed member of the bZIP family of proteins. The spliced form of XBP1 (XBP1S) is a 376 amino acid (aa), 55 kDa transcription factor essential for the unfolded protein response. XBP1S is formed during endoplasmic reticulum stress by IRE-1-mediated splicing that creates a 210 aa substitution for XBP1 aa 161-261. XBP1S contains a basic DNA binding motif (aa 72-94) and a leucine-zipper domain (aa 98-126). Within the region used as an immunogen, human XBP1S shares 96% aa sequence identity with mouse XBP1S.

• Long Name:

  X-box Binding Protein 1

• Entrez Gene IDs:

  7494 (Human); 22433 (Mouse); 289754 (Rat)

• Alternate Names:

  HTF; TREB5; X-box binding protein 1; X-box-binding protein 1; XBP1; XBP-1; XBP2; XBP2Tax-responsive element-binding protein 5