IL-2

Interleukin-2 is a protein that has a variety of immunologic functions, the most notable being the ability of IL-2 to promote the proliferation ａnd maturation of activated T cells. A comparison of the amino acid sequences of human ａnd murine IL-2 shows an approximately 60% sequence similarity, ａnd human sequence IL-2 has been found to be active on murine cell lines. The 55 kDa IL-2 Rα is specific for IL-2 ａnd binds with low affinity. The 75 kDa IL-2 Rβ, which is also a component of the IL-15 receptor, binds IL-2 with intermediate affinity. The 64 kDa common gamma chain γc/IL-2 Rγ, which is shared with the receptors for IL-4, ⁻⁷, -9, -15, ａnd -21, does not independently interact with IL-2. Upon ligand binding, signal transduction is performed by both IL-2 Rβ ａnd γc. IL-2 is best known for its autocrine ａnd paracrine activity on T cells. It drives resting T cells to proliferate ａnd induces IL-2 ａnd IL-2 Rα synthesis. It contributes to T cell homeostasis by promoting the Fas-induced death of naïve CD4+ T cells but not activated CD4+ memory lymphocytes . IL-2 plays a central role in the expansion ａnd maintenance of regulatory T cells, although it inhibits the development of Th17 polarized cells. Thus, IL-2 may be a key cytokine in the natural suppression of autoimmunity.

▍Source

Recombinant Human IL-2 is expressed from human 293 cells (HEK293). It contains AA Ala 21 - Thr 153. Predicted molecular mass 19.2 kDa. This protein carries a polyhistidine tag at the C-terminus.

▍Endotoxin

Less than 1.0 EU per μg by the LAL method.

▍AA Sequence

APTSSSTKKT QLQLEHLLLD LQMILNGINN YKNPKLTRML TFKFYMPKKA TELKHLQCLE EELKPLEEVL NLAQSKNFHL RPRDLISNIN VIVLELKGSE TTFMCEYADE TATIVEFLNR WITFCQSIIS TLT

▍Purity

Purity >90% as determined by SDS-PAGE.

▍Formulation

Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization. Contact us for customized product form or formulation.

▍Reconstitution

Reconstitute in sterile distilled water or aqueous buffer containing 0.1% BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots ａnd stored at < -20°C. Further dilutions should be made in appropriate buffered solutions.

▍Storage

For long term storage, the product should be stored at lyophilized state at -20°C or lower.

Please avoid repeated freeze-thaw cycles.

This product is stable after storage at

-20°C to ⁻⁷0°C for 12 months in lyophilized state;

⁻⁷0°C for 3 months under sterile conditions after reconstitution.

▍SDS-PAGE

Human IL-2, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 90%.