Human IL-1 beta, Tag Free (ILB-H4110) is expressed from E.coli cells. It contains AA Ala 117 - Ser 269 (Accession # P01584-1).
Predicted N-terminus: Met
This protein carries no "tag".
The protein has a calculated MW of 17.5 kDa. The protein migrates as 17 kDa under reducing (R) condition (SDS-PAGE).
Less than 0.1 EU per μg by the LAL method.
>95% as determined by SDS-PAGE.
>95% as determined by SEC-MALS.
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4. Normally trehalose is added as protectant before lyophilization.
Contact us for customized product form or formulation.
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.
This product is stable after storage at:
- -20°C to -70°C for 12 months in lyophilized state;
- -70°C for 3 months under sterile conditions after reconstitution.
Human IL-1 beta, Tag Free on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.
The purity of Human IL-1 beta, Tag Free (Cat. No. ILB-H4110) was more than 95% and the molecular weight of this protein is around 15-23 kDa verified by SEC-MALS.
Immobilized Human IL-1 beta, Tag Free (Cat. No. ILB-H4110) at 10 μg/mL (100 μL/well) can bind Human IL-1 RII, Fc Tag (Cat. No. IL2-H4256) with a linear range of 8-63 ng/mL (QC tested).
Human IL-1 RII, Fc Tag (Cat. No. IL2-H4256) captured on CM5 chip via anti-human IgG Fc antibodies surface can bind Human IL-1 beta, Tag Free (Cat. No. ILB-H4110) with an affinity constant of 0.622 nM as determined in a SPR assay (Biacore T200) (Routinely tested).
活性（Bioactivity）-Cell based assay
Human IL-1 beta, Tag Free (Cat. No. ILB-H4110) stimulates secretion of IFN-gamma by NK-92 human natural killer lymphoma cells. The EC50 for this effect is 1.02-1.33 ng/mL (Routinely tested).
Interleukin-1 beta (IL-1β) is also known as catabolin, is a cytokine protein that in humans is encoded by the IL1B gene. IL-1β precursor is cleaved by caspase 1 (interleukin 1 beta convertase). Cytosolic thiol protease cleaves the product to form mature IL-1 beta. IL1β are structurally related polypeptides that share approximately 21% amino acid (aa) identity in human. Both proteins are produced by a wide variety of cells in response to inflammatory agents, infections, or microbial endotoxins. While IL1α and IL1β are regulated independently, they bind to the same receptor and exert identical biological effects. IL-1β is a member of the interleukin 1 cytokine family. This cytokine is produced by activated macrophages as a proprotein, which is proteolytically processed to its active form by caspase 1 (CASP1/ICE). This cytokine is an important mediator of the inflammatory response, and is involved in a variety of cellular activities, including cell proliferation, differentiation, and apoptosis. The induction of cyclooxygenase-2 (PTGS2/COX2) by this cytokine in the central nervous system (CNS) is found to contribute to inflammatory pain hypersensitivity. This gene and eight other interleukin 1 family genes form a cytokine gene cluster on chromosome 2.