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Human IL-13 Protein, Fc Tag  pdf  pdf  pdf

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Human IL-13, Fc Tag (IL3-H4269) is expressed from human 293 cells (HEK293). It contains AA Leu 25 - Asn 146 (Accession # NP_002179.2).

Predicted N-terminus: Gly

Molecular Characterization

Fc(Thr 106 - Lys 330)P01857
IL-13(Leu 25 - Asn 146)NP_002179.2

This protein carries a human IgG1 Fc tag at the N-terminus.

The protein has a calculated MW of 40.2 kDa. The protein migrates as 45-60 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.


Less than 1.0 EU per μg by the LAL method.



>95% as determined by SDS-PAGE.


Lyophilized from 0.22 μm filtered solution in 50 mM Tris,100 mM Glycine, pH7.5. Normally trehalose is added as protectant before lyophilization.

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Please see Certificate of Analysis for specific instructions.

For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.


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

Please avoid repeated freeze-thaw cycles.

No activity loss is observed after storage at:

  1. 4-8°C for 12 months in lyophilized state;
  2. -70°C for 3 months under sterile conditions after reconstitution.


Human IL-13, Fc Tag (Catalog # IL3-H4269) SDS-PAGE gel

Human IL-13, Fc Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.



Human IL-13, Fc Tag (Catalog # IL3-H4269) ELISA bioactivity

Measured by its binding ability in a functional ELISA. Immobilized Human IL-13RA1, His Tag (Catalog # IL1-H5224) at 10 μg/mL (100 μL/well) can bind Human IL-13, Fc Tag (Catalog # IL3-H4269) with a linear range of 0.256-10 μg/mL.

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Human IL-13, Fc Tag (Catalog # IL3-H4269) ELISA bioactivity

Measured by its binding ability in a functional ELISA. Immobilized Human IL-13, Fc Tag (Catalog # IL3-H4269) at 10 μg/mL (100 μL/well) can bind Anti IL-13 MAb, Human IgG4 with a linear range of 0.8-25 ng/mL.

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Interleukin 13 (IL13) is also known as ALRH, BHR1and P600, is a single-chain glycosylated polypeptide, and is a cytokine critical in regulating inflammatory and immune responses. IL13 is secreted by many cell types, but especially by T helper type 2 (Th2) cells. IL-13 induces its effects through a multi-subunit receptor that includes the alpha chain of the IL-4 receptor (IL-4Rα) and at least one of two known IL-13-specific binding chains. The functions of IL-13 overlap considerably with those of IL-4, especially with regard to changes induced on hematopoietic cells, but these effects are probably less important given the more potent role of IL-4. IL-13 induces matrix metalloproteinases (MMPs) as part of a mechanism that protects against excessive allergic inflammation that predisposes to asphyxiation. IL-13 induces many features of allergic lung disease, including airway hyperresponsiveness, goblet cell metaplasia and mucus hypersecretion, which all contribute to airway obstruction.


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