The recombinant human IL-1 beta protein is expressed in E. coli, whose amino acid sequence is derived from mature form of human IL1β (NP_000567.1), (Ala 117-Ser 269) was expressed.

The recombinant human IL1β consisting of 154 amino acids migrates with an apparent molecular mass of 17 kDa as estimated in SDS-PAGE under reducing conditions.

Human IL-1 beta protein
1. Measured by its binding ability in a functional ELISA. Immobilized recombinant human IL1B at 2 μg/mL (100μl/well) can bind recombinant human IL1R2 with a linear range of 6.25-400 ng/ml.
2. Measured in a cell proliferation assay using D10.G4.1 mouse helper T cells. The ED50 for this effect is typically 2-8 pg/mL.
3. Measured by its binding ability in a functional ELISA.
4. Immobilized human IL1B at 10 μg/mL (100 μl/well) can bind human IL1R1, The EC50 of human IL1R1 is 0.48 μg/mL.
5. Measured by its ability to induce Interferon gamma secretion by human natural killer lymphoma NK-92 cells. The ED50 for this effect is 0.4-2 ng/mL.

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