Animal-Free IL-2 Protein, Human (His)

IL-2 protein is mainly produced by activated CD4-positive helper T cells and plays an important role in immune response and tolerance. Binding to IL-2R induces downstream signaling through JAK1 and JAK3 phosphorylation, thereby activating various pathways, including STAT, PI3K, and MAPK. Animal-Free IL-2 Protein, Human (His) is the recombinant human-derived animal-FreeIL-2 protein, expressed by E. coli , with C-His labeled tag. This product is for cell culture use only.

The cytokine interleukin-2 (IL-2), produced primarily by activated CD4-positive helper T-cells and, to a lesser extent, by activated CD8-positive T-cells and natural killer (NK) cells, plays pivotal roles in the immune response and tolerance. IL-2 binds to a receptor complex composed of either the high-affinity trimeric IL-2R (IL2RA/CD25, IL2RB/CD122, and IL2RG/CD132) or the low-affinity dimeric IL-2R (IL2RB and IL2RG). This interaction induces oligomerization and conformational changes in the IL-2R subunits, initiating downstream signaling with the phosphorylation of JAK1 and JAK3. Subsequently, JAK1 and JAK3 phosphorylate the receptor, creating a docking site for the phosphorylation of various substrates, including STAT5. This process activates multiple pathways, including STAT, phosphoinositide-3-kinase/PI3K, and mitogen-activated protein kinase/MAPK pathways. IL-2 functions as a T-cell growth factor, enhances NK-cell cytolytic activity, and promotes robust proliferation of activated B-cells, leading to increased immunoglobulin production. Furthermore, IL-2 plays a crucial role in regulating the adaptive immune system by controlling the survival and proliferation of regulatory T-cells, essential for maintaining immune tolerance. Additionally, IL-2 participates in the differentiation and homeostasis of various effector T-cell subsets, including Th1, Th2, Th17, as well as memory CD8-positive T-cells.

1.Measure by its ability to induce proliferation in CTLL-2 cells. The ED₅₀ for this effect is <3 ng/mL. The specific activity of recombinant human IL-2 is approximately >5 x 10⁶ IU/mg.
2.Measure by its ability to induce proliferation in NK cells. The ED₅₀ for this effect is <46 ng/mL

Human

E. coli

C-6*His

P60568 (A21-T153)

3558  [NCBI]

Full Length of Mature Protein

APTSSSTKKTQLQLEHLLLDLQMILNGINNYKNPKLTRMLTFKFYMPKKATELKHLQCLEEELKPLEEVLNLAQSKNFHLRPRDLISNINVIVLELKGSETTFMCEYADETATIVEFLNRWITFCQSIISTLT

Approximately 13 kDa, based on SDS-PAGE under reducing conditions.

≥ 95%, as determined by reducing SDS-PAGE.

Lyophilized powder

1.Lyophilized from a 0.22 μm filtered solution of PBS, pH 8.0.
2.Lyophilized from a 0.22 μm filtered solution of NaPi buffer, 0.018% SDS, pH 7.5, trehalose.
3.Lyophilized from a 0.22 μm filtered solution of NaPi buffer, 0.018% SDS, pH 7.5.
Please refer to the lot-specific COA for specific buffer information.

<0.1 EU per 1 μg of the protein by the LAL method.

It is recommended to reconstitute to a concentration of 100-200 μg/mL in ddH₂O. For long term storage it is recommended to add a carrier protein (0.1% BSA, 5% HSA, 10% FBS or 5% Trehalose).

Stored at -20°C for 2 years from date of receipt. After reconstitution, it is stable at 4°C for 1 week or -20°C for longer (with carrier protein). It is recommended to freeze aliquots at -20°C or -80°C for extended storage.

Room temperature in continental US; may vary elsewhere.