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- W2008531330 abstract "A quantitative colorimetric assay for serum carboxypeptidase B (SCPB, anaphylatoxin inactivator, kininase I) is described. SCPB is known to possess an enzymatic specificity for cleaving COOH-terminallysyl and arginyl residues which is similar to the specificity of bovine pancreatic carboxypeptidase B. One function of SCPB involves the inactivation of C3a and C5a, the two complement derived anaphylatoxins. Since cobalt markedly enhances the activity of the enzyme, serum is treated with CoCl2 before the SCPB assay is performed. Salmine, a protamine from salmon sperm, was selected as the substrate because it contains multiple COOH-terminal arginyl residues and is digested more rapidly by SCPB than other common substrates of carboxypeptidase B, including hippuryl-arginine and benzyl-glycylarginine. The kinetics for arginine release from salmine were first-order throughout the course of the assay and the colorimetric values obtained were related to micromols of arginine released. A unit of SCPB is defined as one nanomol of arginine released per minute per milliliter of serum. The range of SCPB activity in serum from healthy individuals was found to be 318 to 466 units. The medians of SCPB activity in sera obtained from patients with Dengue shock syndrome and with shock following intravenous dextran infusion were both lower than the mean SCPB activity of healthy individuals. SCPB levels in patients homozygous and heterozygous for cystic fibrosis were within the normal range." @default.
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- W2008531330 title "Serum carboxypeptidase B: A spectrophotometric assay using protamine as substrate" @default.
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- W2008531330 doi "https://doi.org/10.1016/0003-2697(76)90139-1" @default.
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