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• W2140790588 abstract "An in vitro system for the preparation of bioactive peptides is described. This system couples three different posttranslational modification enzymes, prohormone convertases (PCs), carboxypeptidase E, and peptidyl α-amidating enzyme, to transform recombinant precursors into bioactive peptides. Three different precursors, mouse proopiomelanocortin (mPOMC), rat proenkephalin (rPE), and human proghrelin, were used as model systems. The conversion of mPOMC and rPE to smaller peptide products was measured by radioimmunoassay. After optimization of the system, excellent efficiency was obtained: about 85% of starting mPOMC was converted to des-acetyl α-melanocyte-stimulating hormone (α-MSH). For proenkephalin, 75 and 96% yields were obtained for the opioid peptides Met-RGL and Met-enk, respectively. Cell-based assays demonstrated that in-vitro-generated des-acetyl α-MSH successfully activated the melanocortin 4 receptor. Proghrelin digestion was used to screen the specificity of PC cleavage and to confirm the cleavage site by mass spectroscopy. Mature ghrelin was produced by human furin, mouse prohormone convertase 1, and human prohormone convertase 7 but not by mouse prohormone convertase 2. These results demonstrate that our in vitro system (1) can produce peptides in quantities sufficient to carry out functional analyses, (2) can be used to determine the specificity of proprotein convertases on recombinant precursors, and (3) has the potential to identify novel peptide functions on both known and orphan G-protein-coupled receptors." @default.
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• W2140790588 date "2007-07-01" @default.
• W2140790588 modified "2023-09-26" @default.
• W2140790588 title "Production of bioactive peptides in an in vitro system" @default.
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• W2140790588 doi "https://doi.org/10.1016/j.ab.2007.04.020" @default.
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