膜杰作
Star Staining
分子别名（Synonym）
Spike,S protein RBD,Spike glycoprotein Receptor-binding domain,S glycoprotein RBD,Spike protein RBD
表达区间及表达系统（Source）
Biotinylated SARS-CoV-2 Spike RBD (L452R, T478K), His,Avitag (Trehalose free) (SPD-C82Ep) is expressed from human 293 cells (HEK293).
蛋白结构（Molecular Characterization）
This protein carries a polyhistidine tag at the C-terminus, followed by an Avi tag (Avitag™)
The protein has a calculated MW of 28.3 kDa. The protein migrates as 33-40 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.
标记（Labeling）
Biotinylation of this product is performed using Avitag™ technology. Briefly, the single lysine residue in the Avitag is enzymatically labeled with biotin.
蛋白标记度（Protein Ratio）
Passed as determined by the HABA assay / binding ELISA.
内毒素（Endotoxin）
Less than 1.0 EU per μg by the LAL method.
纯度（Purity）
>90% as determined by SDS-PAGE.
制剂（Formulation）
Supplied as 0.2 μm filtered solution in PBS, pH7.4.
Contact us for customized product form or formulation.
运输（Shipping）
This product is supplied and shipped with blue ice, please inquire the shipping cost.
存储（Storage）
Please avoid repeated freeze-thaw cycles.
This product is stable after storage at:
- The product MUST be stored at -70°C or lower upon receipt;
- -70°C for 3 months under sterile conditions.
电泳（SDS-PAGE）
Biotinylated SARS-CoV-2 Spike RBD (L452R, T478K), His,Avitag (Trehalose free) on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 90%.
SEC-MALS
The purity of Biotinylated SARS-CoV-2 Spike RBD (L452R, T478K), His,Avitag (Trehalose free) (Cat. No. SPD-C82Ep) is more than 85% and the molecular weight of this protein is around 30-44 kDa verified by SEC-MALS.
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背景（Background）
Its been reported that Coronavirus can infect the human respiratory epithelial cells through interaction with the human ACE2 receptor. The spike protein is a large type I transmembrane protein containing two subunits, S1 and S2. S1 mainly contains a receptor binding domain (RBD), which is responsible for recognizing the cell surface receptor. S2 contains basic elements needed for the membrane fusion.The S protein plays key parts in the induction of neutralizing-antibody and T-cell responses, as well as protective immunity.
