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- W2023798858 abstract "Plant peroxidases (EC 1.11.1.7) including horseradish peroxidase (HRP-C), but not the nonplant peroxidases, are known to be highly specific indole-3-acetic acid (IAA) oxygenases which oxidize IAA in the absence of H2O2, and superoxide anion radicals (O2*-) are produced as by-products. Hypaphorine, a putative auxin antagonist isolated from ectomycorrhizal fungi, inhibited the IAA-dependent generation of O2*- by HRP-C, which occurs in the absence of H2O2. Hypaphorine has no effect on the nonspecific heme-catalyzed O2*- generation induced by high concentration of ethanol. It is probable that the inhibitory effect of hypaphorine on O2*- generation is highly specific to the IAA-dependent reaction. The mode of inhibition of the IAA-dependent O2*--generating reaction by hypaphorine was analyzed with a double-reciprocal plot and determined to be competitive inhibition, indicating that hypaphorine competes with IAA by binding to the putative IAA binding site on HRP-C. This implies the importance of structural similarity between hypaphorine and IAA. This work presented the first evidence for antagonism between IAA and a structurally related fungal alkaloid on binding to a purified protein which shares some structural similarity with auxin-binding proteins." @default.
- W2023798858 created "2016-06-24" @default.
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- W2023798858 date "2001-11-01" @default.
- W2023798858 modified "2023-10-15" @default.
- W2023798858 title "Fungal Auxin Antagonist Hypaphorine Competitively Inhibits Indole-3-acetic Acid-Dependent Superoxide Generation by Horseradish Peroxidase" @default.
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- W2023798858 doi "https://doi.org/10.1006/bbrc.2001.5800" @default.
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