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PhosphoSitePlus® Resource

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Source / Purification

Recombinant mouse His6IL-33 (mHis6IL-33) Ser109-Ile266 (Accession #NP_598536) was produced in E.coli at Cell Signaling Technology.

Product Description


>98% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant mHis6IL-33. All lots are greater than 98% pure.

Molecular Formula:

Recombinant N-terminally His6-tagged mIL-33 has a calculated MW of 19,439. DTT-reduced and non-reduced protein migrate as 22 kDa polypeptides.


The bioactivity of recombinant mHis6IL-33 was determined by its ability to induce IL-13 production by MC/9 cells. The ED50 of each lot is between 1-6 ng/ml.


Less than 0.01 ng endotoxin/1 μg mHis6IL-33.

Product Usage Information


With carrier: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 1 mM EDTA, 3 mM DTT and 20 μg BSA per 1 μg mHis6IL-33. Carrier free: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 1 mM EDTA and 3 mM DTT.

Storage: Stable in lyophilized state at 4°C for 1 year after receipt. Sterile stock solutions reconstituted with carrier protein are stable at 4°C for 2 months and at -20°C for 6 months. Avoid repeated freeze-thaw cycles. Maintain sterility. Storage at -20°C should be in a manual defrost freezer.

IL-33 is a novel member of the IL-1 family of proteins that was discovered in a computational search to identify unknown family members (1). IL-33 is expressed by fibroblasts and endothelial cells, and is upregulated in response to inflammatory stimuli (1). IL-33 plays a key role in Th2 type inflammatory responses, including atopic allergic responses and asthma (1,2). The IL-33 receptor consists of the ST2 and IL-1 accessory protein (IL-1-Acp) (1,3). ST2 is expressed on mast cells, basophils and Th2 cells (1). In addition to its putative role as a Th2 cytokine, IL-33 also contains a nuclear localization domain and may function as a nuclear factor (4,5). The nuclear function of IL-33 remains unclear. IL-33 is released by cellular necrosis, similar to other “alarmins”, thereby signaling tissue injury (5,6). However, more recent data suggests that IL-33 may also be actively secreted from live cells via a non-classical mechanism (7).

1.  Liew, F.Y. et al. (2010) Nat Rev Immunol 10, 103-10.

2.  Chackerian, A.A. et al. (2007) J Immunol 179, 2551-5.

3.  Borish, L. and Steinke, J.W. (2011) Curr Allergy Asthma Rep 11, 7-11.

4.  Moussion, C. et al. (2008) PLoS One 3, e3331.

5.  Cayrol, C. and Girard, J.P. (2009) Proc Natl Acad Sci U S A 106, 9021-6.

6.  Lüthi, A.U. et al. (2009) Immunity 31, 84-98.

7.  Kakkar, R. et al. (2012) J Biol Chem 287, 6941-8.

Entrez-Gene Id 77125
Swiss-Prot Acc. Q8BVZ5

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.

Mouse His6Interleukin-33 (mHis6IL-33)