Description:
Recombinant Human SDF-1? produced in E.Coli is a non-glycosylated, Polypeptide chain containing 72 amino acids and having a molecular mass of 8508 Dalton. The rHuSDF-1? is purified by proprietary chromatographic techniques.

Source:
Escherichia Coli.

Formulation:
The protein was lyophilized from a concentrated (1mg/ml) sterile solution containing no additives.

Solubility:
It is recommended to reconstitute the lyophilized rHuSDF-1??in sterile 18MΩ-cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.

Stability:
Lyophilized rHuSDF-1? although stable at room temperature for 3 weeks, should be stored desiccated below -18C. Upon reconstitution rHuSDF-1? should be stored at 4C between 2-7 days and for future use below -18C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Please prevent freeze-thaw cycles.

Purity:
Greater than 98.0% as determined by:
(a) Analysis by RP-HPLC.
(b) Anion-exchange FPLC.
(c) Analysis by reducing and non-reducing SDS-PAGE Silver Stained gel.

Amino acid sequence:
The sequence of the first five N-terminal amino acids was determined and was found to be Lys-Pro-Val-Ser-Leu

Dimers and aggregates:
Less than 1% as determined by silver-stained SDS-PAGE gel analysis.

Biological Activity:
Fully biologically active when compared to standard. The specific activity as determined by its ability to chemoattract human peripheral T cells activated with PHA and IL-2 using a concentation of 20-80 ng/ml.

Endotoxin:
Less than 0.1 ng/µg (IEU/µg) of SDF-1?.

Protein content:
Protein quantitation was carried out by two independent methods:
1. UV spectroscopy at 280 nm using the absorbency value of 1.06 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. Analysis by RP-HPLC, using a standard solution of SDF-1??as a Reference Standard.