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| Synonyms | T-cell growth factor （TCGF）, Aldesleukin, Lymphokine, IL-2. |
| Introduction | IL2 is a secreted cytokine that is important for the proliferation of T and B lymphocytes. The receptor of this cytokine is a heterotrimeric protein complex whose gamma chain is also shared by interleukin 4 （IL4） and interleukin 7 （IL7）. The expression of this gene in mature thymocytes is monoallelic, which represents an unusual regulatory mode for controlling the precise expression of a single gene. The targeted disruption of a similar gene in mice leads to ulcerative colitis-like disease, which suggests an essential role of this gene in the immune response to antigenic stimuli. |
| Description | Interleukin-2 Human Recombinant 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 Interleukin -2 has an Ser substitute for Cysteine at position 126. The IL-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 & 0.89mg dibasic sodium phosphate buffer to a pH=7.5. |
| Solubility | It is recommended to reconstitute the lyophilized Interleukin 2 in sterile 20mM AcOH not less than 100μg/ml, which can then be further diluted to other aqueous solutions. |
| Stability | Lyophilized Interleukin-2 although stable at room temperature for 3 weeks, should be stored desiccated below -18°C. Upon reconstitution IL2 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） Analysis by SDS-PAGE. |
| 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. |
| Biological Activity | The ED50 as determined by the dose-dependant stimulation of murine CTLL-2 cells is < 0.0645 ng/ml, corresponding to a Specific Activity of 16.9 MIU/mg. |
| Protein content | Protein quantitation was carried out by two independent methods 1. 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 （InliGenetics）. 2. Analysis by RP-HPLC, using a calibrated solution of IL-2 as a Reference Standard. |
| Usage | 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. |
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