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- W2000908780 abstract "Many secretory proteins contain an amino-terminal propeptide extension which is removed prior to secretion. The point of cleavage is usually marked by a basic pair of amino acids containing arginine. Canavanine, an analogue of arginine, is incorporated into protein and has been shown to inhibit the proteolytic processing of several of these prosecretory proteins. The addition of 3 mM canavanine to Hep G2 cells incubated with L-[35S]methionine inhibited the secretion of 11 plasma proteins studied. Of the secretory proteins studied only albumin is thought to contain a propeptide, which is marked by a pair of arginine residues at its point of proteolytic processing. Canavanine had varying effects on the secretion of plasma proteins; ranging from a 43-53% inhibition of secretion of alpha 1 antitrypsin and alpha 1 anti-chrymotrypsin to nearly abolishing (93% inhibition) secretion of transferrin. Canavanine also caused most of the proteins studied to migrate slower on sodium dodecyl sulfate polyacrylamide gel electrophoresis. Two of the canavanine-treated proteins (albumin and transferrin) which underwent marked changes in electrophoretic mobility were more sensitive than untreated proteins to proteolysis by Staphylococcus Aureus V8 proteinase. The slower electrophoretic migration and the greater sensitivity to proteolysis of these proteins may be attributed to marked structural changes caused by the incorporation of canavanine. This suggests that the inhibition of plasma protein secretion by canavanine is not only due to an inhibition of the processing of proteins but may be caused by structural distortions of the secretory proteins." @default.
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- W2000908780 date "1985-11-01" @default.
- W2000908780 modified "2023-09-26" @default.
- W2000908780 title "Effects of canavanine on the secretion of plasma proteins by Hep G2 cells" @default.
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- W2000908780 doi "https://doi.org/10.1016/0167-4889(85)90021-7" @default.
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