【项目简介】
Carboxypeptidase B1, encoded by the CPB1 gene, specifically cleaves the Cterminal Arg and Lys residues with a preference for Arg. Expressed mainly in pancreas, CPB1 is a useful serum marker for acute pancreatitis. The deduced amino acid sequence of human CPB1 consists of a signal peptide (residues 1 to 15), a pro region (residue 16 to 110), and a mature chain (residues 111 to 417). The purified rhCPB1 corresponds to the pro form, which can be activated by trypsin, the only pancreatic protease capable of generating active enzyme from the zymogen in vitro.
 
【检验原理】
本试剂盒采用双抗体夹心ELISA法。酶标微孔板上预包被有抗人CPB1抗体，当加入标准品和待测样本时，标准品和待测样本中的人CPB1会和该抗体结合。洗板后，游离的其他成分被洗去，加入辣根过氧化物酶标记的的抗人CPB1抗体可与被酶标板捕获的人CPB1结合，形成“包被抗人CPB1抗体+人CPB1+抗人CPB1抗体-HRP”免疫复合物。当加入TMB显色底物后，复合物上连接的HRP催化底物反应，生成蓝色产物，终止反应后变为黄色。在450nm处测定OD值，人CPB1浓度与OD450值之间呈正比，可通过绘制标准曲线求出标本中人CPB1的浓度。