膜杰作
Star Staining
分子别名（Synonym）
TNFRSF11B,OCIF,OPG,Osteoprotegerin
表达区间及表达系统（Source）
Human Osteoprotegerin, His Tag (TNB-H5220) is expressed from human 293 cells (HEK293). It contains AA Glu 22 - Leu 401 (Accession # NP_002537).
Predicted N-terminus: Glu 22
Request for sequence
蛋白结构（Molecular Characterization）
This protein carries a polyhistidine tag at the C-terminus.
The protein has a calculated MW of 44.4 kDa. The protein migrates as 50-60 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
内毒素（Endotoxin）
Less than 1.0 EU per μg by the LAL method.
纯度（Purity）
>95% as determined by SDS-PAGE.
制剂（Formulation）
Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.
Contact us for customized product form or formulation.
重构方法（Reconstitution）
Please see Certificate of Analysis for specific instructions.
For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.
存储（Storage）
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.
电泳（SDS-PAGE）
Human Osteoprotegerin, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 95%.
活性（Bioactivity）-ELISA
Immobilized Human TNFSF11, Fc Tag (Cat. No. RAL-H5265) at 10 μg/mL (100 μL/well) can bind Human Osteoprotegerin, His Tag (Cat. No. TNB-H5220) with a linear range of 5-156 ng/mL (QC tested).
Protocol
Immobilized Human Osteoprotegerin, His Tag (Cat. No. TNB-H5220) at 5 μg/mL (100 μL/well) can bind Human TRAIL, Mouse IgG2a Fc Tag with a linear range of 0.5-16 ng/mL (Routinely tested).
Protocol
活性（Bioactivity）-BLI
Loaded Human Osteoprotegerin, His Tag (Cat. No. TNB-H5220) on HIS1K Biosensor, can bind Human TRAIL with an affinity constant of 0.831 nM as determined in BLI assay (ForteBio Octet Red96e) (Routinely tested).
Protocol
背景（Background）
Tumor necrosis factor receptor superfamily member 11B (TNFRSF11B) is also known as Osteoclastogenesis inhibitory factor (OCIF), Osteoprotegerin (OPG). TNFRSF11B is a secreted homodimer protein, which can interact with TNFSF10 and TNFSF11. TNFRSF11B acts as decoy receptor for TNFSF11/RANKL and thereby neutralizes its function in osteoclastogenesis. TNFRSF11B inhibits the activation of osteoclasts and promotes osteoclast apoptosis in vitro. Bone homeostasis seems to depend on the local ratio between TNFSF11 and TNFRSF11B. TNFSF10/TRAIL binding blocks the inhibition of osteoclastogenesis.
