Recombinant Human TNF-alpha Pro form Protein

Product: Forchlorfenuron

Recombinant Human TNF-alpha Pro form Protein Summary

Description
Recombinant Human Pro TNF-a Bacterial Protein Fusion Partner protein

Source: E. coli derived

Activity Measured by its ability to be used as a protein substrate for TACE/ADAM17.
Under the described conditions TACE/ADAM17 will cleave pro-TNF-a to produce mature TNF-a.

Assay Procedure

Materials:

  • Assay Buffer: 50 mM Tris, pH 8.0
  • Recombinant Human Pro TNF-a Fusion Protein (rhPro-TNF-a) (Catalog # 1012-PS)
  • Recombinant Human TACE/ADAM17 (rhTACE) (Catalog # 930-ADB)
  • Positive Control: Recombinant Human TNF-a (rhTNF-a) (Catalog # 210-TA)
  • Goat Anti-Human TNF-a Biotinylated Antigen Affinity-purified Polyclonal Antibody (Catalog # BAF210)
  • SDS-PAGE followed by Western Blotting
  1. Dilute rhPro-TNF-a to 0.2 mg/mL in Assay Buffer.
  2. Dilute rhTACE to 0.2 mg/mL in Assay Buffer.
  3. Prepare the following vials for a final volume of 20 uL.
    1. 10 uL of rhPro-TNF-a at 0.2 mg/mL + 10 uL of rhTACE at 0.2 mg/mL
    2. 10 uL of rhPro-TNF-a at 0.2 mg/mL + 10 uL of Assay Buffer (control-with incubation)
    3. 10 uL of rhPro-TNF-a at 0.2 mg/mL + 10 uL of Assay Buffer (control-without incubation)
      Note: At this point the concentration of rhPro-TNF-a in the reaction tubes is 0.1 mg/mL.
  4. Incubate vials at 37C overnight (except for the non-incubated control, store at =-20C).
  5. Stop the reactions by adding the reducing gel loading buffer for SDS-PAGE to all vials. Heat the samples at 100C for 3-5 minutes.
    1. Dilute the reaction tubes (and control without incubation) to 50 ng/15 uL in reducing sample buffer.
  6. Prepare a sample of Positive Control at 5 ng/15 uL in reducing sample buffer. Heat the sample at 100C for 3-5 minutes.
  7. Load the samples on a 15% gel.
    1. 50 ng/lane (15 uL) of rhPro-TNF-a of the incubated reactions (including the control with incubation).
    2. 50 ng/lane (15 uL) of rhPro-TNF-a of the control (without incubation).
    3. 5 ng/lane (15 uL) of Positive Control (Catalog # 210-TA).
  8. Follow SDS-PAGE/Western Blotting procedures.
    1. Use the Biotinylated Anti-human TNF-a/TNFSF1A antibody at 0.1 ug/mL. (Catalog # AF-210-NA may be used in place of # BAF210.)
  9. Visually determine processing of rhPro-TNF-a to the mature form by rhTACE by comparing the incubated reactions to the Positive Control.
Source
E. coli
Protein/Peptide Type
Partial Recombinant Protein
Gene
Tnf
Purity
>90%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Endotoxin Note
<1.0 EU per 1 ug of the protein by the LAL method.

Applications/Dilutions

Theoretical MW
45 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.

Packaging, Storage & Formulations

Storage
Protect from light. Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 3 months, -20 to -70 °C under sterile conditions after opening.
Buffer
0.2 um filtered solution in Urea, NaCl, NaH2PO4 and DTT
Purity
>90%, by SDS-PAGE under reducing conditions and visualized by silver stain.
Reconstitution Instructions
Reconstitute at 200 ug/mL in sterile, deionized water.

Alternate Names for Recombinant Human TNF-alpha Pro form Protein

  • APC1 protein
  • Cachectin
  • Cachetin
  • DIF
  • TNF
  • TNF, monocyte-derived
  • tnfa
  • tnf-a
  • TNFalpha
  • TNF-alpha
  • TNF-alpha/TNFSF2
  • TNF-alphacachectin
  • TNFATNF, macrophage-derived
  • TNFSF1A
  • TNFSF2
  • TNFSF2TNF superfamily, member 2
  • tumor necrosis factor (TNF superfamily, member 2)
  • tumor necrosis factor alpha
  • Tumor necrosis factor ligand superfamily member 2
  • tumor necrosis factor
  • tumor necrosis factor-alpha

Background

Tumor necrosis factor alpha (TNF-a), also known as cachectin and TNFSF2, is the prototypic ligand of the TNF superfamily. It is a pleiotropic molecule that plays a central role in inflammation, immune system development, apoptosis, and lipid metabolism (1, 2). Human TNF-a consisits of a 35 amino acid (aa) cytoplasmic domain, a 21 aa transmembrane segment, and a 177 aa extracellular domain (ECD) (3). Within the ECD, human TNF-a shares 97% aa sequence identity with rhesus and 71%-92% with bovine, canine, cotton rat, equine, feline, mouse, porcine, and rat TNF-a. TNF-a is produced by a wide variety of immune, epithelial, endothelial, and tumor cells (1, 2). TNF-a is assembled intracellularly to form a noncovalently linked homotrimer which is expressed on the cell surface (4). Cell surface TNF-a can induce the lysis of neighboring tumor cells and virus infected cells, and it can generate its own downstream cell signaling following ligation by soluble TNFR I (2, 5). Shedding of membrane bound TNF-a by TNF-a-converting-enzyme (TACE or ADAM17) releases the bioactive cytokine, a 55 kDa soluble trimer of the TNF-a extracellular domain (6-8). TNF-a binds the ubiquitous 55-60 kDa TNF RI (9, 10) and the hematopoietic cell-restricted 80 kDa TNF RII (11, 12), both of which are also expressed as homotrimers (1, 2, 13). Both type I and type II receptors bind TNF-a with comparable affinity (14), although only TNF RI contains a cytoplasmic death domain which triggers the activation of apoptosis. Soluble forms of both types of receptors are released and can neutralize the biological activity of TNF-a (15). TACE/ADAM17 cleaves the 26 kDa form at the Ala76-Val77 bond to produce the 17 kDa form (6, 16). ADAM10 processes the 26 kDa form at the same site as TACE (17). ADAM9 cleaves the 26 kDa form at alternative sites, Ala74-Glu75 and Ser79-Ser80 (18). The use of the recombinant Pro-TNF-a fusion protein as a protein substrate for Pro-TNF-a processing proteases has been tested with recombinant TACE/ADAM17 (R&D Systems, Catalog # 930-ADB), ADAM10 (Catalog # 936-AD and 946-AD), or ADAM9 (Catalog # 949-AD). The disappearance of the fusion protein (45 kDa) and the appearance of the mature TNF-a (17 kDa) were followed by Western blot analysis using an anti-human TNF-a polyclonal antibody (Catalog # AF210 or BAF210).
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PMID: 10528148