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Recombinant Human CD117/c-kit Protein, CF

R&D Systems | Catalog # 332-SR/CF

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Key Product Details

  • R&D Systems Sf 21 (baculovirus)-derived Recombinant Human CD117/c-kit Protein (332-SR/CF)
  • Quality control testing to verify active proteins with lot specific assays by in-house scientists
  • All R&D Systems proteins are covered with a 100% guarantee

Source

Sf 21 (baculovirus)

Accession Number

P10721

Applications

Bioactivity
View all CD117/c-kit Proteins and Enzymes »

Product Specifications

Source

Spodoptera frugiperda, Sf 21 (baculovirus)-derived human CD117/c-kit protein
Gln26-Thr520

Purity

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

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

N-terminal Sequence Analysis

Gln26

Predicted Molecular Mass

55.7 kDa

SDS-PAGE

59-63 kDa, reducing conditions

Activity

Measured by its ability to inhibit SCF-dependent proliferation of TF‑1 human erythroleukemic cells. Kitamura, T. et al. (1989) J. Cell Physiol. 140:323.
The ED50 for this effect is 2-6 µg/mL in the presence of 8 ng/mL of Recombinant Human SCF.

Formulation, Preparation, and Storage

332-SR/CF
Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 200 μg/mL in sterile PBS.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Calculators

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.

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Background: CD117/c-kit

Stem Cell Factor Receptor (SCF R), also known as c-Kit and CD117, is a widely expressed 145 kDa receptor tyrosine kinase. It is the cellular homolog of the feline sarcoma virus protein, v-Kit. Binding of SCF R to SCF, also known as Steel Factor and Kit Ligand, promotes the survival, differentiation, and mobilization of progenitor cells in multiple lineages (1-4). Mutations or deletions of SCF R cause a wide variety of malignancies as well as pigmentation disorders and sterility (5, 6). Mature human SCF R consists of a 499 amino acid (aa) extracellular domain (ECD) with five tandem immunoglobulin-like domains, a 21 aa transmembrane segment, and a 431 aa cytoplasmic domain with the split tyrosine kinase domain (7). Within the ECD, human SCF R shares 73% and 76% aa sequence identity with mouse and rat SCF R, respectively. Alternative splicing of human SCF R generates a potentially secreted isoform that corresponds to the first four Ig-like domains. SCF is expressed as transmembrane and soluble noncovalent homodimers (8). One SCF dimer binds to two molecules of SCF R, inducing receptor dimerization and activation (8). Transmembrane SCF induces more prolonged signaling through SCF R compared to soluble SCF (9). Rat SCF is active on mouse and human cells, but human SCF is only weakly active on mouse cells (10). A 100 kDa glycosylated ECD fragment of SCF R can be shed into the circulation by TACE/ADAM17, and this fragment inhibits the interaction of SCF with transmembrane SCF R (11, 12). SCF is a primary growth and activation factor for mast cells and eosinophils (13). SCF R expression on mast cells enables them to infiltrate SCF-secreting tumors where they promote tumor growth and induce local immune suppression (14). SCF R is up‑regulated on dendritic cells by Th2- or Th17-biasing stimuli, and it is required for subsequent dendritic cell induction of Th2 and Th17 responses (15). SCF R protects vascular smooth muscle cells from apoptosis and assists in the recovery of cardiac function following myocardial infarction (16, 17).

References

  1. Kimura, Y. et al. (2011) PLoS ONE 6:e26918.
  2. Tallini, Y.N. et al. (2009) Proc. Natl. Acad. Sci. USA 106:1808.
  3. Bashamboo, A. et al. (2006) J. Cell Sci. 119:3039.
  4. Sun, L. et al. (2004) J. Clin. Invest. 113:1364.
  5. Pittoni, P. et al. (2011) Oncogene 30:757.
  6. Sartini, S. et al. (2011) Curr. Med. Chem. 18:2893.
  7. Yarden, Y. et al. (1987) EMBO J. 6:3341.
  8. Lemmon, M.A. et al. (1997) J. Biol. Chem. 272:6311.
  9. Miyazawa, K. et al. (1995) Blood 85:641.
  10. Martin, F.H. et al. (1990) Cell 63:203.
  11. Turner, A.M. et al. (1995) Blood 85:2052.
  12. Cruz, A.C. et al. (2004) J. Biol. Chem. 279:5612.
  13. Jamur, M.C. and C. Oliver (2011) Front. Biosci. (School Ed.) 3:1390.
  14. Huang, B. et al. (2008) Blood 112:1269.
  15. Krishnamoorthy, N. et al. (2008) Nat. Med. 14:565.
  16. Wang, C.-H. et al. (2007) Arterioscler. Thromb. Vasc. Biol. 27:540.
  17. Kanellakis, P. et al. (2006) Cardiovasc. Res. 70:117.

Long Name

Stem Cell Factor Receptor

Alternate Names

c-kit, CD117, ckit, KIT, PBT, SCF R, SCFR

Entrez Gene IDs

3815 (Human); 16590 (Mouse); 64030 (Rat)

Gene Symbol

KIT

UniProt

P10721

Additional CD117/c-kit Products

Product Documents for Recombinant Human CD117/c-kit Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Human CD117/c-kit Protein, CF

For research use only

Citations for Recombinant Human CD117/c-kit Protein, CF

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FAQs for Recombinant Human CD117/c-kit Protein, CF

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  • Q: Is the Recombinant Human CD117/c-kit Protein (Catalog # 332-SR-050/CF) a monomer or a dimer?

    A: CD117 has been reported to form soluble non-covalent homodimers, and a dimeric structure was inferred based on the bioactivity of the protein. Both monomers and dimers may be present in solution. We have not performed any structural chracterization and therefore make no claims or specification.

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