| Code | CSB-AP003001HU |
| Abbreviation | Recombinant Human TNFRSF11B protein, partial (Active) |
| MSDS | |
| Size | $142 |
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TNFRSF11B (osteoprotegerin) functions as a soluble decoy receptor for RANKL, making it a critical regulator of osteoclast differentiation and a valuable tool for dissecting RANK/RANKL signaling. This tag-free recombinant construct covers the extracellular ligand-binding domain (aa 22–194) and demonstrates potent neutralization of sRANKL-stimulated U937 cells with an ED50 below 10 ng/mL, corresponding to a specific activity exceeding 1.0 × 10⁵ IU/mg—evidence that supports use in competitive inhibition assays, blocking antibody screening, and RANKL-binding characterization by SPR or BLI. Although expressed in *E. coli*, the confirmed biological activity indicates sufficient conformational integrity of the cysteine-rich domains for functional ligand-receptor interaction studies, including small-molecule inhibitor screening and positive control applications in ELISA-based binding assays. Purity exceeding 95% by SDS-PAGE combined with endotoxin levels below 1.0 EU/μg satisfies the criteria typical for cell-based neutralization experiments requiring minimal innate immune interference.
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