Technical Data
Interleukin 2, Recombinant, Human (Human 293 Cells) (Interleukin-2, IL-2, IL2, Aldesleukin, Lymphokine, T-cell Growth Factor, TCGF)
Molecular Biology Storage: -20CShipping: Blue Ice
Human Cell Expression Cytokines:
Expression of proteins in our Human 293-cell expression system is a cost-effective and scalable production method for high-authenticity, recombinant human proteins.

Functional activities of human proteins depend on proper folding, phosphorylation, disulfide bridge formation, and proteolytic processing or appropriate glycosylation. Ideally, recombinant human proteins are produced in human cells that are more authentic in terms of both physical properties and biochemical functions. However, the current process of human cell expression requires a large quantity of DNA and medium supplemented with bovine serum. Hence, it is often a daunting task to produce sufficient amount of high quality proteins for drug discovery or diagnostic development (1-100mg) at acceptable cost. United States Biological is now supplying a high yield, cost-effective and versatile system to produce active recombinant human proteins in a human cell line to meet the special needs of the broad scientific community and drug discovery industry. In this system, we have broken key bottleneck steps to increase protein production and reduce cost, including

Engineered human cell line adapted to suspension for growth in serum-free and chemically defined medium
Proprietary expression vectors driven by strong promoters and signal peptides
Large scale transient expression with small quantity of DNA
Rapid creation of stable human cell lines and adaptation to serum-free medium
Short time to scale up production
Efficient tag or tag-free purification

Using this expression system, we have produced a large number of highly active human cytokines, kinases and phosphatases. Our technology is particularly suitable for the production of high-authenticity human proteins in medium scale as research and diagnostic reagents, drug screening targets, and therapeutic proteins for preclinical evaluation. Key differences of recombinant human protein production in different systems are illustrated below:

Expression system E. coli Insect cell CHO cell Human cell
Protein folding + ++ +++ ++++
Phosphorylation - ++ +++ ++++
Proteolytic processing - + +++ ++++
Glycosylation - Poor Not human-like Authentic

Recombinant human Interleukin 2 (IL-2) expressed in engineered human cells, human 293 cells. IL-2 belongs to the IL-2 protein family. IL-2 is a 15kD glycosylated monomer. IL-2 is produced primarily by activated CD4+ T cells, but it is also expressed by naive CD8+ T cells, eosinophils, dendritic and thymic cells. IL-2 is an essential activator of the immune response, it is required for the growth of T cells, activated B cells and T helper cell differentation. IL-2 stimulates the activity of NK cells and is involved in anti-inflammatory reactions and in hematopoiesis.

The specific activity was determined by the dose-dependent stimulation of the proliferation of mouse CTLL-2 cells (mouse cytotoxic T cell line).

Specific Activity:
0.2-2ng/ml ED50

Storage and Stability:
Lyophilized powder may be stored at -20C. Stable for 6 months at -20C. Reconstitute with sterile PBS, 0.1% endotoxin-free recombinant HSA. Aliquot to avoid repeated freezing and thawing. Store at -20C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

Molecular Weight:
Source: Recombinant human IL-2 expressed in human 293 cells. It is a glycosylated monomer.
Purity: 95% as determined by SDS-PAGE and Coomasssie blue staining. Endotoxin: 1EU/ug (LAL)
Form: Supplied as a lyophilized powder from PBS. Reconstitute with sterile PBS, 0.1% endotoxin-free recombinant HSA.

Important Note: This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.
1. Malek, T.R., Annual Review of Immunology 26: 453-479 (2008). 2. Gearing, A.J.H., et al., in Lymphokines and Interferons, a Practical Approach p296 (1987).

Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.