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• W192672120 abstract "The biosynthesis and post-translational modifications, including proteolytic processing and core glycosylation, of the human renin precursor have been studied in vitro in a cell-free system. For this purpose, highly enriched renin mRNA was isolated from a renin-producing juxtaglomerular cell tumor and translated in rabbit reticulocyte lysate containing [35S]methionine in the presence or absence of dog pancreas microsomal membranes. Fluorographic analysis of the radioactive translation products, immunoprecipitated and then resolved on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, revealed that the primary translation product, preprorenin (Mr = 45,000), is initially processed to glycosylated prorenin (Mr = 47,000) during or shortly after its sequestration into the lumen of the microsomal membranes. The vectorial translocation across the membrane was confirmed by the observation that the proform was resistant to digestion with trypsin while preprorenin was sensitive. Radiosequencing and the use of prorenin-specific antibodies established the cleavage points of the pre- and profragment and showed that the in vitro precursor of human renin contains a 23-residue signal peptide and a 43-residue prosegment. The post-translational modification which, despite the removal of signal peptide, resulted in an increase in apparent Mr, reflects the glycosylation as examined using Xenopus oocytes microinjected with renin mRNA in the presence of tunicamycin, an inhibitor of protein glycosylation. Four anti-peptide antibodies which specifically recognize the NH2 terminus (Pro 1), two middle parts (Pro 2A and Pro 2B), and COOH terminus (Pro 3) of the prosegment, respectively, have been raised and used to characterize plasma prorenin. Renin precursors (pre- and prorenin) synthesized in vitro or in the kidney reacted with these antibodies (anti-Pro 1, anti-Pro 2A, anti-Pro 2B, and anti-Pro 3). However, quite unexpectedly, human plasma prorenin was recognized only by anti-Pro 3, indicating that plasma prorenin is a truncated version of intact prorenin, which lacks a large portion of the NH2 terminus of the prosegment and may represent an activation intermediate. This somewhat surprising result may lead to a better understanding of the exact roles and activation mechanisms of plasma prorenin existing in a relatively large amount." @default.
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• W192672120 date "1985-12-01" @default.
• W192672120 modified "2023-10-15" @default.
• W192672120 title "In vitro biosynthesis of human renin and identification of plasma inactive renin as an activation intermediate." @default.
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• W192672120 doi "https://doi.org/10.1016/s0021-9258(17)36250-6" @default.
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