膜杰作
Star Staining
分子别名（Synonym）
Fletcher factor,kallikrein B, plasma (Fletcher factor) 1,kininogenin,KLK3plasma kallikrein,KLKB1,plasma kallikrein heavy chain,plasma kallikrein light chain,Plasma Kallikrein,Plasma Prekallikrein,PPK，KLKB1
表达区间及表达系统（Source）
Human Plasma Kallikrein/KLKB1, His Tag (KL1-H52H9) is expressed from human 293 cells (HEK293). It contains AA Gly 20 - Ala 638 (Accession # P03952-1).
Predicted N-terminus: Gly 20
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 71.1 kDa. The protein migrates as 70-90 kDa when calibrated against Star Ribbon Pre-stained Protein Marker 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.
>90% as determined by SEC-MALS.
制剂（Formulation）
Supplied as 0.2 μm filtered solution in 50mM Tris 150mM NaCl,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 3 months under sterile conditions.
电泳（SDS-PAGE）
Human Plasma Kallikrein/KLKB1, 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% (With Star Ribbon Pre-stained Protein Marker).
SEC-MALS
The purity of Human Plasma Kallikrein/KLKB1, His Tag (Cat. No. KL1-H52H9) is more than 90% and the molecular weight of this protein is around 75-90 kDa verified by SEC-MALS.
Report
活性（Bioactivity）
Measured by its ability to cleave a flourogenic peptide substrate Pro-Phe-Arg-7-amido-4-methylcoumarin (PFR-AMC). The specific activity is >1000 pmol/min/μg(QC tested).
Protocol
背景（Background）
Human Plasma Kallikrein, a serine protease, is synthesized in the liver and circulates in the plasma by binding to high molecular weight (HMW) kininogen or as a free zymogen. The enzyme cleaves Lys-Arg and Arg-Ser bonds. It activates, in a reciprocal reaction, factor XII after its binding to a negatively charged surface. It also releases bradykinin from HMW kininogen and may also play a role in the renin-angiotensin system by converting prorenin into renin.
