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Structure-activity study on the quinone/quinone methide chemistry of flavonoids.
A structure-activity study on the quinone/quinone methide chemistry of a series of 3',4'-dihydroxyflavonoids was performed. Using the glutathione trapping method followed by HPLC, (1)H NMR,Expand
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Regioselectivity and reversibility of the glutathione conjugation of quercetin quinone methide.
The chemical reactivity, isomerization, and glutathione conjugation of quercetin o-quinone were investigated. Tyrosinase was used to generate the unstable quercetin o-quinone derivative which couldExpand
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Peroxidase-catalyzed formation of quercetin quinone methide-glutathione adducts.
The oxidation of quercetin by horseradish peroxidase/H(2)O(2) was studied in the absence but especially also in the presence of glutathione (GSH). HPLC analysis of the reaction products formed in theExpand
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NADPH-cytochrome reductase catalysed redox cycling of 1,4-benzoquinone; hampered at physiological conditions, initiated at increased pH values.
In the present study the inability of 1,4-benzoquinone to support NADPH-cytochrome reductase catalysed redox cycling was investigated. The results obtained demonstrate that NADPH-cytochrome reductaseExpand
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Conversion of phenol derivatives to hydroxylated products by phenol hydroxylase from Trichosporon cutaneum. A comparison of regioselectivity and rate of conversion with calculated molecular orbital
This study describes the regioselective hydroxylation and the rates of conversion of a series of fluorinated phenol derivatives by phenol hydroxylase from the yeast Trichosporon cutaneum. The naturalExpand
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Disulfide bond structure of the AVR9 elicitor of the fungal tomato pathogen Cladosporium fulvum: evidence for a cystine knot.
Disease resistance in plants is commonly activated by the product of an avirulence (Avr) gene of a pathogen after interaction with the product of a matching resistance (R) gene in the host. InExpand
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A novel purification method for histidine-tagged proteins containing a thrombin cleavage site.
A general procedure for the purification of histidine-tagged proteins has been developed using immobilized metal-ion affinity chromatography. This two-step purification method can be used forExpand
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A comparative carbon-13, nitrogen-15, and phosphorus-31 nuclear magnetic resonance study on the flavodoxins from Clostridium MP, Megasphaera elsdenii, and Azotobacter vinelandii.
The flavodoxins from Megasphaera elsdenii, Clostridium MP, and Azotobacter vinelandii were studied by 13C, 15N, and 31P NMR techniques by using various selectivity enriched oxidized riboflavinExpand
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TEAC antioxidant activity of 4-hydroxybenzoates.
The influence of pH, intrinsic electron donating capacity, and intrinsic hydrogen atom donating capacity on the antioxidant potential of series of hydroxy and fluorine substituted 4-hydroxybenzoatesExpand
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Regioselectivity and quantitative structure-activity relationships for the conjugation of a series of fluoronitrobenzenes by purified glutathione S-transferase enzymes from rat and man.
Quantitative structure-activity relationships (QSAR's) are described for the rate of conjugation of a series of fluoronitrobenzenes with cytosolic as well as with two major alpha and mu class enzymesExpand
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