Recombinant Human CD117/c-kit Fc Chimera Protein, CF

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Recombinant Human CD117/c-kit Fc Chimera Protein Bioactivity.
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Product Details

Recombinant Human CD117/c-kit Fc Chimera Protein, CF Summary

Product Specifications

>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.
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 30.0‑180 ng/mL.
Chinese Hamster Ovary cell line, CHO-derived human CD117/c-kit protein
Human SCFR
Accession # P10721.1
IEGRMD Human IgG1 Fc
N-terminus C-terminus
Accession #
N-terminal Sequence
Predicted Molecular Mass
82 kDa
100-120 kDa, under reducing conditions.

Product Datasheets

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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.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 500 μg/mL in 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.

Scientific Data

Bioactivity View Larger

Recombinant Human CD117/c-kit Fc Chimera Protein (Catalog # 10961-SR) inhibits SCF-dependent proliferation of TF‑1 human erythroleukemic cells. The ED50 for this effect is 30.0-180 ng/mL.

SDS-PAGE View Larger

2 μg/lane of Recombinant Human CD117/c-kit Fc Chimera Protein (Catalog # 10961-SR) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 100-120 kDa and 200-240 kDa, respectively.

Reconstitution Calculator

Reconstitution Calculator

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.


Background: CD117/c-kit

Stem cell factor receptor (SCFR), also known as c-Kit and CD117, is a type III receptor tyrosine kinase that acts as the receptor for the cytokine SCF. Human SCFR is expressed in embryonic stem cells and is involved in regulation of cell survival and proliferation, hematopoiesis, gametogenesis, and melanogenesis (1-3). Mature human SCFR consists of an extracellular domain (ECD) with five tandem immunoglobulin-like domains, a single transmembrane segment, and a cytoplasmic region with a split tyrosine kinase domain. Within the ECD, human SCFR shares 73% and 76% amino acid sequence identity with mouse and rat SCFR, respectively. Several SCFR isoforms, produced by alternative mRNA splicing, have been identified in humans and can be characterized by the presence or absence of a tetrapeptide sequence (GNNK) in the juxtamembrane region of the ECD (4, 5). Binding of SCFR to SCF triggers receptor dimerization and activates downstream signaling (6). SCF is a primary growth and activation factor for mast cells and eosinophils and SCFR expression on mast cells enables them to infiltrate SCF‑secreting tumors where they promote tumor growth and induce local immune suppression (7, 8). SCFR 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 (9). SCFR protects vascular smooth muscle cells from apoptosis and assists in the recovery of cardiac function following myocardial infarction (10, 11). Mutations or deletions of SCFR cause a wide variety of malignancies as well as pigmentation disorders and sterility (12).

  1. Roskoski, R. et al. (2005) Bioche. & Biophy Res Comm. 338:1307.
  2. Bashamboo, A. et al. (2006) J. Cell Sci. 119:3039.
  3. Kimura, Y. et al. (2011) PLoS ONE 6:e26918.
  4. Lennartsson, J. and Rönnstrand L. (2012) Physiol Rev. 92:1619.
  5. Caruana, G. et al. (1999) Oncogene 18:5573.
  6. Lemmon, M.A. et al. (1997) J. Biol. Chem. 272:6311.
  7. Jamur, M.C. and C. Oliver (2011) Front. Biosci. (School Ed.) 3:1390.
  8. Huang, B. et al. (2008) Blood 112:1269.
  9. Krishnamoorthy, N. et al. (2008) Nat. Med. 14:565.
  10. Wang, C.-H. et al. (2007) Arterioscler. Thromb. Vasc. Biol. 27:540.
  11. Kanellakis, P. et al. (2006) Cardiovasc. Res. 70:117.
  12. Sartini, S. et al. (2011) Curr. Med. Chem. 18:2893.
Long Name
Stem Cell Factor Receptor
Entrez Gene IDs
3815 (Human); 16590 (Mouse); 64030 (Rat)
Alternate Names
CD117 antigen; CD117; ckit; c-kit; EC 2.7.10; EC; KIT; PBT; piebald trait; Proto-oncogene c-Kit; proto-oncogene tyrosine-protein kinase Kit; SCF R; SCFR; SCFRmast/stem cell growth factor receptor; soluble KIT variant 1; Tyrosine-protein kinase Kit; v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene homolog; v-kit Hardy-Zuckerman 4 feline sarcoma viral oncogene-like protein


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