Recombinant Human Interleukin-2 - rHuIL-2



Data Sheet
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Recombinant Human Interleukin-2 - rHuIL-2

Description: Recombinant Human IL-2 produced in E.Coli is a single, non-glycosylated mutein (variant form) of human IL-2 polypeptide chain containing 134 amino acids and having a molecular mass of 15517 Dalton. Our rHuIL-2 has an Ser substitute for Cysteine at position 126. The rHuIL-2 is purified by proprietary chromatographic techniques.
Source: Escherichia Coli.
Physical Appearance: Sterile Filtered White lyophilized (freeze-dried) powder.
Formulation: The protein (1.1mg/ml) was lyophilized after extensive dialysis against 0.17mg sodium monobasic and 0.89mg dibasic sodium phosphate buffer to a pH=7.5.
Solubility: It is recommended to reconstitute the lyophilized rHuIL-2 in sterile 20mM AcOH not less than 100µg/ml, which can then be further diluted to other aqueous solutions.
Stability: Lyophilized rHuIL-2 although stable at room temperature for 3 weeks, should be stored desiccated below -18 °C. Upon reconstitution rHuIL-2 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 (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 Met-Ala-Pro-Thr-Ser.
Dimers and aggregates: Less than 1% as determined by silver-stained SDS-PAGE gel analysis.
Biological Activity: ProSpec's rHuIL-2 is fully biologically active when compared to standard. The ED50 as determined by the dose-dependant stimulation of murine CTLL-2 cells isless then0.0645 ng/ml, corresponding to a Specific Activity of 16.9 MIU/mg.
Endotoxin: Less than 0.1 ng/µg (IEU/µg) of rHuIL-2.
Protein content: Protein quantitation was carried out by two independent methods: UV spectroscopy at 280 nm using the absorbency value of 0.614 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). Analysis by RP-HPLC, using a calibrated solution of IL-2 as a Reference Standard.
Usage: This material is for research, laboratory or further manufacturing purposes.