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- W2072331569 abstract "The study and identification for the first time of a soluble form of a seprase activity from bovine serum is presented. To date, this activity has only been reported to be an integral membrane protease but has been known to shed from its membrane. The activity was purified 30,197-fold to homogeneity, using a combination of column chromatographies, from bovine serum. Inhibition by DFP, resulting in an IC50 of 100:nM confirms classification as a serine protease. The protease after separation and visualisation by native PAGE was subjected to tryptic digestion and the subsequent peptides sequenced. Each peptide sequenced was found to be present in the primary structure of seprase/fibroblast activation protein (FAP), a serine gelatinase specific for proline-containing peptides and macromolecules. Substrate specificity studies using kinetic, RP-HPLC and LC–MS analysis of synthetic peptides suggest that this peptidase has an extended substrate-binding region in addition to the primary specificity site S1. This analysis revealed at least five subsites to be involved in enzyme–substrate binding, with the smallest peptide cleaved being a tetrapeptide. A proline residue in position P1 was absolutely necessary therefore showing high primary substrate specificity for the Pro-X bond, while a preference for a hydrophobic residue at the C-terminal end of the scissile bond (P1′) was evident. The enzyme also showed complete insensitivity to the prolyl oligopeptidase specific inhibitors, JTP-4819, Fmoc-Ala-pyrrCN and Z-Phe-Pro-BT. To date, no physiological substrate has clearly been defined for this protease but its ability to effectively degrade gelatin suggests a candidate protein substrate in vivo and a possible role in extracellular matrix protein degradation." @default.
- W2072331569 created "2016-06-24" @default.
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- W2072331569 date "2004-11-01" @default.
- W2072331569 modified "2023-10-16" @default.
- W2072331569 title "Purification, identification and characterisation of seprase from bovine serum" @default.
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- W2072331569 doi "https://doi.org/10.1016/j.biocel.2004.05.006" @default.
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