| A soluble factor produced by monocytes, macrophages, and other cells which activates T-lymphocytes and potentiates their response to mitogens or antigens. IL-1 consists of two distinct forms, IL-1 alpha and IL-1 beta which perform the same functions but are distinct proteins. The synthesis of IL-1 can be induced by other cytokines including TNF-alpha , IFN-alpha , IFN-beta and IFN-g and also by bacterial endotoxins , viruses, mitogens, and antigens. In human skin fibroblasts IL-1 alpha and TNF-alpha induce the synthesis of IL-1beta . In pheochromocytoma cells, NGF induces the synthesis of IL-1. |
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| Catalog # | I7663-23A |
| Description | Recombinant Rat Interleukin-1 beta produced in E.Coli is a non-glycosylated, Polypeptide chain containing 153 amino acids and having a molecular mass of 17415.82 Dalton. The Recombinant Rat IL-1b 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-Val-Pro-Ile-Arg. |
| Dimers and Aggregates | Less than 1% as determined by silver-stained SDS-PAGE gel analysis. |
| Biological Activity | The ED50 as determined by the dose-dependent stimulation of murine D10S cells is < 0.1 ng/ml, corresponding to a Specific Activity of 1 x 107 IU/mg. |
| Endotoxin | 0.1ng/ug (IEU/ug) of Recombinant Rat Interleukin-1 beta. |
| Protein Content | Protein quantitation was carried out by two independent methods: |
| 1. UV spectroscopy at 280 nm using the absorbency value of 0.558 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics). |
| 2. Analysis by RP-HPLC, using a standard solution of Rat IL-1b as a Reference Standard. |
| Gene | Name: Il1b |
| Solubility | It is recommended to reconstitute the lyophilized Rat Interleukin-1b in sterile 18M -cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions. |
| Stability | Lyophilized Rat IL-1 beta although stable at room temperature for 3 weeks, should be stored desiccated below -180C. Upon reconstitution IL-1 beta 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 | 17.42kD |
| Source | E. coli |
| Purity | 98.0% as determined by: |
| (a) Analysis by RP-HPLC. |
| (b) Anion-exchange FPLC. |
| (c) Analysis by reducing and non-reducing SDS-PAGE Silver Stained. |
| 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. |
