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  • Title: Ascorbate is the natural substrate for plant peroxidases.
    Author: Mehlhorn H, Lelandais M, Korth HG, Foyer CH.
    Journal: FEBS Lett; 1996 Jan 15; 378(3):203-6. PubMed ID: 8557101.
    Abstract:
    Ascorbate-dependent detoxification of hydrogen peroxide by guaiacol-type peroxidases is increased considerably in the presence of 3,4-dihydroxyphenolic compounds, suggesting that ascorbate is the natural substrate for many types of peroxidase in situ and not just the ascorbate-specific peroxidases. The ascorbate-dependent destruction of hydrogen peroxide in the more acidic cellular compartments such as the vacuole may be an important function of such non-specific peroxidases. The stress-induced production of phenolic compounds would render the guaiacol peroxidases in other less acidic-cellular sites effective as ascorbate-dependent H2O2-detoxifying enzymes.
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