• Species Reactivity

  Human

• Specificity

  Detects human BAFF/BLyS/TNFSF13B in direct ELISAs and Western blots. In Western blots, approximately 5% cross‑reactivity with recombinant human (rh) TL1A/TNSF15 is observed and no cross-reactivity with rhAPRIL, rhTNF-alpha, rhFas Ligand, rhGITR Ligand, rhLIGHT, rhTRAIL, rhTRANCE, or rhTWEAK is observed.

• Source

  Monoclonal Mouse IgG    ₁ Clone # 137314

• Purification

  Protein A or G purified from hybridoma culture supernatant

• Immunogen

  E. coli-derived recombinant human BAFF/BLyS/TNFSF13B    
  Ala81-Leu285    
  Accession # Q9Y275

• Formulation

  Supplied in a saline solution containing BSA and Sodium Azide.

• Label

  Phycoerythrin

Applications

• Recommended    
  Concentration

  Sample

• Intracellular Staining by Flow Cytometry

  10 µL/10    ⁶ cells

  See below

• 
  

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

Data Examples

Preparation and Storage

• Shipping

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

• Stability & Storage

  Protect from light.    Do not freeze.    

• 12 months from date of receipt, 2 to 8 °C as supplied.

Background: BAFF/BLyS/TNFSF13B

BAFF, also known as TALL-1, BLyS, and THANK, is a type II transmembrane glycoprotein belonging to the TNF superfamily and has been designated as TNF superfamily member 13B (TNFSF13B). Human BAFF is a 285 amino acid (aa) protein consisting of a 218 aa extracellular domain, a 21 aa transmembrane region and a 46 aa cytoplasmic tail (1, 2). BAFF has the typical structural characteristics of the TNF superfamily ligands. It is a homotrimeric protein having the structurally conserved motif known as TNF homology domain (3, 4). A higher ordered structure composed of a cluster of trimeric units resembling the structure of a viral capsid has also been reported (4). Human BAFF may be shed from the cell surface by proteolytic cleavage between Arg133 and Ala134 to yield a soluble form of the protein that is detectable in serum (1, 5). Within the TNF superfamily BAFF shares the highest homology (48%) with APRIL (1). BAFF shares with APRIL the ability to bind to BCMA and TACI and also binds specifically to BAFF Receptor (BAFF R, also known as BR3 or TNFSFR13C), which is the principal BAFF receptor (6 - 8). All three receptors are type III transmembrane proteins that are expressed in B cells. BAFF and APRIL can form active heteromers that bind to TACI (9). BAFF is expressed in peripheral blood mononuclear cells, spleen and lymph nodes. Its expression in resting monocytes is up-regulated by IFN-alpha, IFN-beta, LPS and IL-10. BAFF provides critical survival signals to a subset of B cells with intermediate maturation status (T2 B cells) during the immune response (10). BAFF also plays an important role in the development of lymphoid tissue and enhances the survival of activated memory B cells (7, 11). Human and mouse BAFF share 86% aa sequence identity (1).

• References:

1. Schneider, P. et al. (1999) J. Exp. Med. 189:1747.

2. Mukhopadhyay, A. et al. (1999) J. Biol. Chem. 274:15978.

3. Karpusas, M. et al. (2002) J. Mol. Biol. 315:1145.

4. Liu, Y. et al. (2002) Cell 108:383.

5. Cheema, G.S. et al. (2001) Arthr. Rheum. 44:1313.

6. Marsters, S.A. et al. (2000) Curr. Biol. 10:785.

7. Thompson, J.S. et al. (2001) Science 293:2108.

8. Ng, L.G. et al. (2004) J. Immunol. 173:807.

9. Roschke, V. et al. (2002) J. Immunol. 169:4314.

10. Batten, M. et al. (2000) J. Exp. Med. 192:1453.

11. Avery, D.T. et al. (2003) J. Clin. Invest. 112:286.

• Long Name:

  B cell Activating Factor

• Entrez Gene IDs:

  10673 (Human); 24099 (Mouse); 498666 (Rat)

• Alternate Names:

  ApoL related ligand TALL-1; B lymphocyte stimulator; BAFF; BAFFB-cell activating factor; B-cell-activating factor; BLyS; BLYSB-lymphocyte stimulator; CD257 antigen; CD257; Dendritic cell-derived TNF-like molecule; DTL; TALL1; TALL-1delta BAFF; TALL1Delta4 BAFF; THANK; TNF- and APOL-related leukocyte expressed ligand 1; TNF and ApoL-related leukocyte expressed ligand 1; TNF homolog that activates apoptosis; TNFSF13B; TNFSF20; tumor necrosis factor (ligand) superfamily, member 13b; tumor necrosis factor (ligand) superfamily, member 20; tumor necrosis factor ligand superfamily member 13B; tumor necrosis factor superfamily, member 13b; tumor necrosis factor-like protein ZTNF4; ZTNF4