• Purity

  >95%, by SDS-PAGE under reducing conditions and visualized by silver stain.

• Endotoxin Level

  <0.10 EU per 1 μg of the protein by the LAL method.  

• Activity

  Measured by its ability to inhibit the TNF-alpha mediated cytotoxicity in the L?929 mouse fibroblast cells in the presence of the metabolic inhibitor actinomycin D. Matthews, N. and M.L. Neale (1987) in Lymphokines and Interferons, A Practical Approach. Clemens, M.J.     et al. (eds): IRL Press. 221. The ED    ₅₀ for this effect is 0.2-0.6 μg/mL in the presence of 0.25 ng/mL rhTNF-alpha.

• Source

  E. coli-derived Pro24-Thr206

• Accession #

• N-terminal Sequence    
  Analysis

  Pro24

• Predicted Molecular Mass

  20 kDa

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

Background: TNF RII/TNFRSF1B

TNF RI (also known as the p60 or p55 TNFR) and TNF RII (the p75 or p80 TNFR) are two distinct type I transmembrane glycoproteins that bind TNF with high-affinity. Both RI and RII are prototypic members of the TNF receptor superfamily and have been designated TNFRSF1A and TNFRSF1B, respectively. The extracellular domains of both receptors contain four conserved cysteine-rich domains while their intracellular domains are dissimilar, indicative of distinct signaling pathways. Human TNF RII cDNA encodes a 461 amino acid (aa) residue precursor protein with a 22 aa putative signal peptide, a 235 aa extracellular domain, a 20 aa transmembrane domain and a 174 aa cytoplasmic domain. Whereas all cell types studied express TNF RI, TNF RII expression is limited primarily to hematopoietic cells and cells of the immune system. Most of the biological functions of TNF are mediated via TNF RI. Soluble forms of both TNF RI and TNF RII, generated as a result of proteolytic cleavage of the extracellular domains, have been detected in vivo in various biological fluids. The soluble TNF receptors can bind TNF with high affinity and function as TNF antagonists (1 - 4).

• References:

1. Chen G. and D.V. Goeddel (2002) Science 296:1634.

2. MacEwan, D.J. (2002) Cell Signal. 14:477.

3. Locksley, R.M. et al. (2001) Cell 104:487.

4. Feldmann, M.and R.N. Maini (2001) Annu. Rev. Immunol. 19:163.

• Long Name:

  Tumor Necrosis Factor Receptor II

• Entrez Gene IDs:

  7133 (Human); 21938 (Mouse); 156767 (Rat)

• Alternate Names:

  CD120b antigen; CD120b; Etanercept; p75 TNF receptor; p75TBPII; p75TNFR; soluble TNFR1B variant 1; TNF RII; TNFBRp80 TNF-alpha receptor; TNF-R2; TNFR2TNFR1B; TNF-R75; TNFR80; TNFRII; TNF-RII; TNF-R-II; TNFR-II; TNFRSF1B; tumor necrosis factor beta receptor; tumor necrosis factor binding protein 2; Tumor necrosis factor receptor 2; tumor necrosis factor receptor superfamily member 1B; tumor necrosis factor receptor superfamily, member 1B; Tumor necrosis factor receptor type II