ProSpec-SCF Human

Kit ligand Precursor, C-kit ligand, SCF, Mast cell growth factor, MGF, SF, KL-1, Kitl, DKFZp686F2250.

Stem cell factor / KIT ligand is a cytokine which binds CD117. SCF is also known as “steel factor” or “c-kit ligand”. SCF exists in two forms, cell surface bound SCF and soluble SCF. Soluble SCF is produced by the cleavage of surface bound SCF by metalloproteases. SCF is a growth factor important for the survival, proliferation, and differentiation of hematopoietic stem cells and other hematopoietic progenitor cells. One of its roles is to change the BFU-E cells, which are the earliest erythrocyte precursors in the erythrocytic series, into the CFU-E .

Stem Cell Factor Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 165 amino acids and having a molecular mass of 18409 Dalton.
The SCF is purified by proprietary chromatographic techniques.

Escherichia Coli.

Sterile Filtered White lyophilized powder.

Lyophilized from a concentrated solution in water containing 0.02% NaHCO₃.

It is recommended to reconstitute the lyophilized Stem Cell Factor in sterile 18MΩ-cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.

Lyophilized KIT ligand although stable at room temperature for 3 weeks, should be stored desiccated below -18°C. Upon reconstitution SCF should be stored at 4°C between 2-7 days and for future use below -18°C.
For long term storage it is recommended to add a carrier protein .
Please prevent freeze-thaw cycles.

Greater than 98.0% as determined by:
Analysis by SEC-HPLC.
Analysis by -PAGE.

The sequence of the first five N-terminal amino acids was determined and was found to be Met-Glu-Gly-Ile-Cys.

The ED50 as determined by the dose-dependant stimulation of Human TF-1 cells is < 2 ng/ml, corresponding to a Specific Activity of 500,000 IU/mg.

Protein quantitation was carried out by two independent methods
1. UV spectroscopy at 280 nm using the absorbency value of 0.52 as the extinction coefficient for a 0.1% solution. This value is calculated by the PC GENE computer analysis program of protein sequences .
2. Analysis by RP-HPLC, using a standard solution of Stem Cell Factor as a Reference Standard.

1.Title:Direct binding of Cbl to Y568 and Y936 of the stem cell factor receptor/c-Kit is required for ligand-induced ubiquitination, internalization and degradation.
Publication:Biochemical Journal Immediate Publication. Published on 19 Jun 2006 as manuscript BJ20060464.
Link:http://www.biochemj.org/bj/imps_x/pdf/BJ20060464.pdf

2.Title:The D816V Mutation of c-Kit Circumvents a Requirement for Src Family Kinases in c-Kit Signal Transduction.
Publication: March 5, 2009, doi: 10.1074/jbc.M808058200 April 24, 2009 The Journal of Biological Chemistry, 284, 11039-11047.
Link:http://www.jbc.org/content/284/17/11039.full

3.Title:Structural Basis for c-KIT Inhibition by the Suppressor of Cytokine Signaling 6 Ubiquitin Ligase.
Publication:First Published on October 28, 2010, doi: 10.1074/jbc.M110.173526 January 7, 2011 The Journal of Biological Chemistry, 286, 480-490.
 Link:http://www.jbc.org/content/286/1/480.full

Prospec’s products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.