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Flavonoid-peroxidase reaction as a detoxification mechanism of plant cells against H2O2

Yamasaki, H ; Sakihama, Y ; Ikehara, N

Plant physiology (Bethesda), 1997-12, Vol.115 (4), p.1405-1412 [Periódico revisado por pares]

Rockville, MD: American Society of Plant Physiologists

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Título:
Flavonoid-peroxidase reaction as a detoxification mechanism of plant cells against H2O2
Autor: Yamasaki, H ; Sakihama, Y ; Ikehara, N
Assuntos: ACIDE ASCORBIQUE ; ACIDO ASCORBICO ; ACTIVIDAD ENZIMATICA ; ACTIVITE ENZYMATIQUE ; ANALISIS CUANTITATIVO ; ANALYSE QUANTITATIVE ; ANTIOXIDANTES ; ANTIOXIDANTS ; ANTIOXYDANT ; ASCORBIC ACID ; BIOCHEMICAL PATHWAYS ; Biological and medical sciences ; CHEMICAL COMPOSITION ; CHEMICAL REACTIONS ; COMPOSICION QUIMICA ; COMPOSITION CHIMIQUE ; ENZYMIC ACTIVITY ; FEUILLE ; FREE RADICALS ; Fundamental and applied biological sciences. Psychology ; GLICOSIDOS ; GLYCOSIDE ; GLYCOSIDES ; HOJAS ; HYDROGEN PEROXIDE ; KAEMPFEROL ; LEAVES ; Metabolism ; Metabolism. Physicochemical requirements ; OXIDACION ; OXIDATION ; OXYDATION ; PEROXIDASAS ; PEROXIDASES ; PEROXIDO DE HIDROGENO ; PEROXYDASE ; PEROXYDE D'HYDROGENE ; Plant physiology and development ; QUANTITATIVE ANALYSIS ; QUERCETIN ; QUERCETINA ; QUERCETINE ; RADICAL LIBRE ; RADICALES LIBRES ; REACCIONES QUIMICAS ; REACTION CHIMIQUE ; SCHEFFLERA ; SCHEFFLERA ARBORICOLA ; VIA BIOQUIMICA DEL METABOLISMO ; VOIE BIOCHIMIQUE DU METABOLISME
É parte de: Plant physiology (Bethesda), 1997-12, Vol.115 (4), p.1405-1412
Notas: 1997071106
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Descrição: Recent studies have revealed that dietary flavonoids are potent radical scavengers, acting in a manner similar to ascorbate and alpha-tocopherol. However, it is still not clear whether flavonoids have a similar antioxidative function in plants. We examined the possibility that flavonoids could function as stress protectants in plant cells by scavenging H2O2. Two major flavonoids, quercetin and kaempferol glycosides, were isolated from leaves of the tropical tree Schefflera arboricola Hayata. Both glycosides and aglycones of isolated flavonols were oxidized by H2O2 in the presence of horseradish peroxidase and/or in a soluble fraction of S. arboricola leaf extract. The rates of oxidation were in the order quercetin kaempferol quercetin glycoside kaempferol glycoside. Judging from the effects of inhibitors such as KCN, p-chloromercuribenzoate, and 3-amino-1H-1,2,4-triazole, we conclude that guaiacol peroxidase in the soluble fraction catalyzes H2O2-dependent oxidation of flavonols. In the flavonol-guaiacol peroxidase reaction, ascorbate had the potential to regenerate flavonols by reducing the oxidized product. These results provide further evidence that the flavonoid-peroxidase reaction can function as a mechanism for H2O2 scavenging in plants
Editor: Rockville, MD: American Society of Plant Physiologists
Idioma: Inglês

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Flavonoid-peroxidase reaction as a detoxification mechanism of plant cells against H2O2

Yamasaki, H ; Sakihama, Y ; Ikehara, N

Rockville, MD: American Society of Plant Physiologists

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