Description
Our bioactive Interleukin-15 (IL-15) Human, E. coli Recombinant Protein is a single, non-glycosylated polypeptide chain that contains 114 amino acids and has a molecular mass of 12.9 kDa. The IL-15 is purified by proprietary chromatographic techniques.
Summary
IL-15 is a cytokine that plays a major role in the development of inflammatory and protective immune responses to microbial invaders and parasites by modulating immune cells of both the innate and adaptive immune systems. Stimulates the proliferation of natural killer cells (NK cells), T-cells, and B-cells and promotes the secretion of several cytokines. In monocytes, induces the production of IL-8 and monocyte chemotactic protein 1/CCL2, two chemokines that attract neutrophils and monocytes respectively to sites of infection. Unlike most cytokines, which are secreted in soluble form, IL-15 is expressed in association with its high affinity IL15RA on the surface of IL15-producing cells and delivers signals to target cells that express IL2RB and IL2RG receptor subunits. Binding to its receptor triggers the phosphorylation of JAK1 and JAK3 and the recruitment and subsequent phosphorylation of signal transducer and activator of transcription-3/STAT3 and STAT5. In mast cells, induces the rapid tyrosine phosphorylation of STAT6 and thereby controls mast cell survival and release of cytokines such as IL-4.
Other Names
Interleukin 15, IL15, UniProtKB# P40933.
Source
Expressed in E. coli.
Formulation
Sterile filtered white lyophilized (freeze-dried) powder. The IL-15 protein was lyophilized from PBS pH 7.4.
Amino Acid Sequence
NWVNVISDLK KIEDLIQSMH IDATLYTESD VHPSCKVTAM KCFLLELQVI SLESGDASIH DTVENLIILA NNSLSSNGNV TESGCKECEE LEEKNIKEFL QSFVHIVQMF INTS.
Purity
Greater than 97.0% as determined by:
- Analysis by RP-HPLC.
- Analysis by SDS-PAGE.
Biological Activity
The ED50 as determined by using the cell proliferation assay MO7e human megakaryocytic leukemic cells was found to be 0.3-2.6 ng/ml corresponding to a specific activity greater than 1.5x10⁸ U/mg.
Reconstitution
It is recommended to reconstitute the lyophilized Interleukin-15 in sterile 18MΩ-cm H2O not less than 100 µg/ml, which can then be further diluted to other aqueous solutions.
Shipping
At ambient temperature. Upon receipt, store the product at the temperature recommended below.
Storage/Expiration
Lyophilized IL-15, although stable at room temperature for 3 weeks, should be stored desiccated below -18°C. Upon reconstitution, IL-15 should be stored at 4°C between 2-7 days and for future use below -18°C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Please prevent freeze-thaw cycles.
Usage
This product is intended for Laboratory Research Use Only. Not for use in diagnostic or therapeutic procedures. This product may not be used as a pharmaceutical or veterinary drug, agricultural product, or food additive.