| Interleukin-19 (IL-19) is a novel cytokine that was initially identified during a sequence data base search aimed at finding potential Interleukin-10 homologs. Interleukin-19 shares 21% amino acid identity with IL-10. The exon/intron structure of IL-19 is similar to that of the human IL-10 gene, comprising five exons and four introns within the coding region of the IL-19 cDNA. IL-19 shares a receptor complex with IL-20, indicating that the biological activities of these two cytokines overlap and that both may play an important role in regulating development and proper functioning of the skin. Unlike IL-10, which forms an intercalated dimer, the molecule of IL-19 is a monomer made of seven amphipathic helices, A-G, creating a unique helical bundle. |
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| Catalog # | I8441-01A |
| Description | Recombinant Human IL-19 produced in E.Coli is a single, non-glycosylated polypeptide chain containing 155 amino acids and having a molecular mass of 17913 Dalton. Recombinant Human Interleukin-19 is purified by proprietary chromatographic techniques. |
| Amino Acid Sequence | The sequence of the first five N-terminal amino acids was determined and was found to be Met-Leu-Arg-Arg-Cys. |
| Dimers and Aggregates | Less than 1% as determined by silver-stained SDS-PAGE gel analysis. |
| Biological Activity | Recombinant Human Interleukin-19 is fully biologically active when compared to standard. The activity is determined by it's ability to activate STAT following receptor-ligand interaction. |
| Endotoxin | 0.1ng/ug (IEU/ug) of human IL-19. |
| Protein Content | Protein quantitation was carried out by two independent methods: |
| 1. UV spectroscopy at 280nm. |
| 2. Analysis by RP-HPLC, using a standard solution of IL-19 as a Reference Standard. |
| Solubility | It is recommended to reconstitute the lyophilized Interleukin-19 in sterile 18M -cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions. |
| Stability | Lyophilized Interleukin-19 although stable at room temperature for 3 weeks, should be stored desiccated below -180C. Upon reconstitution Recombinant Human IL-19 should be stored at 40C between 2-7 days and for future use below -180C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Please avoid freeze-thaw cycles. |
| Molecular Weight | 17.91kD |
| Source | E. coli |
| Purity | 98% as determined by RP-HPLC, anion-exchange FPLC and/or reducing and non-reducing SDS-PAGE Silver Stained gel. |
| Concentration | ~1mg/ml |
| Form | Supplied as a lyophilized powder in 10mM sodium citrate, pH 3.0. |
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| Important Note | This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological. |
