膜杰作
Star Staining
分子别名（Synonym）
Claudin-18.2,CLDN18,Claudin-18
表达区间及表达系统（Source）
Mouse Claudin-18.2, His,Twin-Strep Tag (CL2-M5585) is expressed from Baculovirus-Insect cells. It contains AA Met 1 - Thr 203 (Accession # P56857-3).
Predicted N-terminus: His
Request for sequence
蛋白结构（Molecular Characterization）
This protein carries a polyhistidine tag at the N-terminus and a twin strep tag at the C-terminus.
The protein has a calculated MW of 26.7 kDa. The protein migrates as 40 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）
>80% as determined by SDS-PAGE.
制剂（Formulation）
This product is not suitable for cell based experiments due to cytotoxicity of DDM.
DDM and CHS are INDISPENSABLE to keep membrane protein soluble and active, under no circumastance should you remove DDM and CHS.
DDM/CHS buffer (DC-11) is sold separately and not included in protein, and please contact us if you need the buffer.
If glycerol is not compatible to your application, remove glycerol just before immediate experiment, and NEVER store glycerol-free protein solution.
Supplied as 0.2 μm filtered solution in 50 mM HEPES, 150 mM NaCl, DDM, CHS, pH7.5 with glycerol as protectant.
Contact us for customized product form or formulation.
运输（Shipping）
This product is supplied and shipped with dry 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 12 months under sterile conditions.
电泳（SDS-PAGE）
Mouse Claudin-18.2, His,Twin-Strep Tag on SDS-PAGE under reducing (R) condition. The gel was stained with Coomassie Blue. The purity of the protein is greater than 80%.
活性（Bioactivity）-ELISA
Immobilized Mouse Claudin-18.2, His,Twin-Strep Tag (Cat. No. CL2-M5585) at 2 μg/mL (100 μL/well) can bind Anti-Claudin-18 Antibody with a linear range of 0.2-31 ng/mL (QC tested).
Protocol
活性（Bioactivity）-SPR
Claudin-18.1 Monoclonal Antibody captured on CM5 chip via anti-mouse antibodies surface can bind Mouse Claudin-18.2, His,Twin-Strep Tag (Cat. No. CL2-M5585) with an affinity constant of 13 nM as determined in a SPR assay (in presence of DDM and CHS) (Biacore 8K) (Routinely tested).
Protocol
背景（Background）
Claudins (CLDNs) are a family of proteins that form tight junctions and maintain the polarity of epithelial and endothelial cells. CLDN18 is specifically expressed in the stomach and lung. Of the two CLDN18 isoform transcripts produced by alternative splicing, CLDN18.2 is a highly selective gastric lineage marker that determines the gastric phenotype in a neoplastic condition, whereas CLDN18.1 is lung specific. CLDN18.2 is a highly selective gastric lineage antigen expressed exclusively on short-lived differentiated gastric epithelial cells where it has only limited accessibility to antibody drugs.14,15 CLDN18.2 is maintained during the course of malignant transformation and thus frequently displayed on the surface of human gastric cancer cells.
