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 Rat Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 134 amino acids and having a molecular mass of 17kDa.

The IL-2 is purified by proprietary chromatographic techniques. 

Source        Escherichia Coli. 

Physical Appearance     Sterile Filtered White lyophilized (freeze-dried) powder. 

Formulation       The protein (1mg/ml) was lyophilized without any additives. 

Solubility       It is recommended to reconstitute the lyophilized Interleukin 2 in sterile 100mM 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 95.0% as determined 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 0.1-0.4 ng/ml corresponding to a specific activity of 2.5-10MU/mg. 

Protein content       Protein quantitation was carried out by two independent methods1. UV spectroscopy at 280 nm using the absorbency value of 0.535 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 calibrated solution of IL-2 as a Reference Standard. 

Usage        CHI'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.