Author: Sekiya, Mary; Mulcahy, Grace; Irwin, Jane A.; Stack, Colin M.; Donnelly, Sheila M.; Xu, Weibo; Collins, Peter; Dalton, John P.
Title: Biochemical characterisation of the recombinant peroxiredoxin (FhePrx) of the liver fluke, Fasciola hepatica Cord-id: tpee5epk Document date: 2006_9_18
ID: tpee5epk
Snippet: The parasitic helminth Fasciola hepatica secretes a 2-Cys peroxiredoxin (Prx) that may play important functions in host–parasite interaction. Recombinant peroxiredoxin (FhePrx) prevented metal-catalyzed oxidative nicking of plasmid DNA and detoxified hydrogen peroxide when coupled with Escherichia coli thioredoxin and thioredoxin reductase (k(cat)/K(m) = 5.2 × 10(5) M(−1) s(−1)). Enzyme kinetic analysis revealed that the catalytic efficiency of FhePrx is similar to other 2-Cys peroxiredox
Document: The parasitic helminth Fasciola hepatica secretes a 2-Cys peroxiredoxin (Prx) that may play important functions in host–parasite interaction. Recombinant peroxiredoxin (FhePrx) prevented metal-catalyzed oxidative nicking of plasmid DNA and detoxified hydrogen peroxide when coupled with Escherichia coli thioredoxin and thioredoxin reductase (k(cat)/K(m) = 5.2 × 10(5) M(−1) s(−1)). Enzyme kinetic analysis revealed that the catalytic efficiency of FhePrx is similar to other 2-Cys peroxiredoxins; the enzyme displayed saturable enzyme Michaelis–Menten type kinetics with hydrogen peroxide, cumene hydroperoxide and t-butyl hydroperoxide, and is sensitive to concentrations of hydrogen peroxide above 0.5 mM. Like the 2-Cys peroxiredoxins from a related helminth, Schistosoma mansoni, steady-state kinetics indicate that FhePrx exhibits a saturable, single displacement-like reaction mechanism rather than non-saturable double displacement (ping–pong) enzyme substitution mechanism common to other peroxiredoxins. However, unlike the schistosome Prxs, FhePrx could not utilise reducing equivalents supplied by glutathione or glutathione reductase.
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