Biochemical characterisation of the recombinant peroxiredoxin (FhePrx) of the liver fluke, Fasciola hepatica

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Abstract

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 (kcat/Km = 5.2 × 105 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. © 2006 Federation of European Biochemical Societies.

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Sekiya, M., Mulcahy, G., Irwin, J. A., Stack, C. M., Donnelly, S. M., Xu, W., … Dalton, J. P. (2006). Biochemical characterisation of the recombinant peroxiredoxin (FhePrx) of the liver fluke, Fasciola hepatica. FEBS Letters, 580(21), 5016–5022. https://doi.org/10.1016/j.febslet.2006.08.019

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