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- W2063886236 abstract "Proline-specific dipeptidyl peptidase-like (DPP IV; EC 3.4.14.5) activity in bovine serum has attracted little attention despite its ready availability and the paucity of useful proline-cleaving enzymes. Bovine serum DPP IV-like peptidase is very tolerant of organic solvents, particularly acetonitrile: upon incubation for 1 h at room temperature in 70% acetonitrile, 47% dimethylformamide, 54% DMSO and 33% tetrahydrofuran (v/v concentrations) followed by dilution into the standard assay mixture, the enzyme retained half of its aqueous activity. As for thermal performance in aqueous buffer, its relative activity increased up to 50 °C. Upon thermoinactivation at 71 °C, pH 8.0 (samples removed periodically, cooled on ice, then assayed under optimal conditions), residual activities over short times fit a first-order decay with a k-value of 0.071 ± 0.0034 min−1. Over longer times, residual activities fit to a double exponential decay with k1 and k2 values of 0.218 ± 0.025 min−1 (46 ± 4% of overall decay) and 0.040 ± 0.002 min−1 (54 ± 4% of overall decay), respectively. The enzyme's solvent and thermal tolerances suggest that it may have potential for use as a biocatalyst in industry. Kinetic analysis with the fluorogenic substrate Gly-Pro-7-aminomethylcoumarin over a range of pH values indicated two pK values at 6.18 ± 0.07 and at 9.70 ± 0.50. We ascribe the lower value to the active site histidine; the higher may be due to the active site serine or to a free amino group in the substrate." @default.
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- W2063886236 date "2007-08-01" @default.
- W2063886236 modified "2023-10-18" @default.
- W2063886236 title "Solvent and thermal stability, and pH kinetics, of proline-specific dipeptidyl peptidase IV-like enzyme from bovine serum" @default.
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- W2063886236 doi "https://doi.org/10.1016/j.enzmictec.2007.02.007" @default.
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