| Background |
Interleukin-21 (IL-21) belongs to the IL-15/IL-21 family, which exerts pleiotropic immune regulations. IL-21 produced primarily by natural killer T (NKT) cells, T follicular helper (TFH) cells and TH17 cells. As a pleiotropic cytokine, IL-21 has been shown to regulate both innate and humoral immunity. It has potent inhibitory activity towards the activation and maturation of granulocyte-macrophage colony-stimulating factor (GM-CSF)-induced dendritic cells (DCs). In B cells, IL-21 has a major role in the development of immunoglobulin responses. In T cells, it is required to facilitate the functional differentiation of several CD4+ T cell subsets. In addition, the ability of IL-21 to enhance the cytotoxic activity of both CD8+ T cells and NK cells makes it as a potential antitumor agent. |
| Synonyms |
interleukin 21, Za11, IL21 |
| Uniprot ID |
Q9HBE4 |
| Molecular Weight |
The protein has a calculated MW of 16.2 kDa.
The protein migrates as 20 kDa under reducing condition (SDS-PAGE analysis). |
| Expression System |
Escherichia coli |
| Purity |
>95% as determined by SDS-PAGE. |
| Activity |
Measure by its ability to enhance IFN gamma secretion in NK-92 cells.
The ED₅₀ for this effect is <10 ng/mL. |
| Endotoxin Level |
<0.1 EU per 1 μg of the protein by the LAL method. |
| Protein Sequence |
MQDRHMIRMRQLIDIVDQLKNYVNDLVPEFLPAPEDVETNCEWSAFSCFQKAQLKSANTGNNERIINVSIKKLKRKPPSTNAGRRQKHRLTCPSCDSYEKKPPKEFLERFKSLLQKMIHQHLSSRTHGSEDS with polyhistidine tag at the C-terminus. |
| Protein Tag |
His Tag (C-term) |
| Form |
The protein was lyophilized from a 0.2 µm filtered solution containing 1X PBS, pH 8.0. If you have any concerns or special requirements, please confirm with us. |
| Application |
Cell Culture |
