Abbreviation
Recombinant Human IL21 protein (Active)
Purity
>97% as determined by SDS-PAGE.
Endotoxin
Less than 1.0 EU/μg as determined by LAL method.
Activity
Fully biologically active when compared to standard. The ED50 as determined by by a cell proliferation assay using human N1186 T cells is less than 20 ng/ml, corresponding to a specific activity of >5.0x104 IU/mg.
Alternative Names
CVID11; IL 21; IL-21; Il21; IL21_HUMAN; Interleukin 21; Interleukin-21; interleukin-21 isoform; Interleukin21; OTTHUMP00000164088; Za11
Species
Homo sapiens (Human)
Expression Region
23-155aa
Target Protein Sequence
QGQDRHMIRM RQLIDIVDQL KNYVNDLVPE FLPAPEDVET NCEWSAFSCF QKAQLKSANT GNNERIINVS IKKLKRKPPS TNAGRRQKHR LTCPSCDSYE KKPPKEFLER FKSLLQKMIH QHLSSRTHGS EDS
Note: The complete
sequence may include tag sequence, target protein sequence, linker sequence and extra sequence that is
translated with the protein sequence for the purpose(s) of secretion, stability, solubility, etc.
If the exact amino acid sequence of this recombinant protein is critical to your application,
please explicitly request the full and complete sequence of this protein before ordering.
Protein Length
Full Length of Mature Protein
Tag Info
Tag-Free
The tag type will be determined during production process. If you have specified tag type, please tell us and we will develop the specified tag preferentially.
Buffer
Lyophilized from a 0.2 µm filtered PBS, pH 7.4
Lead Time
5-10 business days
Note: All of our proteins are default shipped with normal blue ice packs, if you request to ship with dry ice, please communicate with us in advance and extra fees will be charged.
Notes
Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Shelf Life
The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.
Datasheet & COA
Please contact us to get it.
Description
IL-21 drives pleiotropic effects on T cell expansion, B cell differentiation, and NK cell activation through JAK1/JAK3–STAT3 signaling, making precise functional reconstitution of this cytokine essential for mechanistic immunology studies. This tag-free recombinant human IL-21 encompasses the full mature sequence (residues 23–155) and demonstrates an ED50 below 20 ng/mL in N1186 T cell proliferation assays, corresponding to a specific activity exceeding 5.0 × 10⁴ IU/mg—performance that supports use in T and B cell activation assays, JAK/STAT pathway dissection, and as a reference standard in cytokine detection platforms. Endotoxin levels below 1.0 EU/μg eliminate LPS-driven artifacts that confound immune cell readouts, satisfying the criteria typical for in vivo tumor biology models and primary lymphocyte differentiation experiments. Purity exceeding 97% by SDS-PAGE further provides a suitable basis for antibody development workflows including immunization, ELISA coating, and functional blocking studies.