Effect of exogenous phenols on superoxide production by extracellular peroxidase from wheat seedling roots.
Competitive and complimentary relationships of various peroxidase substrates were studied to elucidate the enzymatic mechanisms underlying production of reactive oxygen species in plant cell apoplast. Dianisidine peroxidase released from wheat seedling roots was inhibited by ferulate and coniferol, while ferulic and coniferyl peroxidases were activated by o-dianisidine. Both ferulate and coniferol, when added together with hydrogen peroxide, stimulated superoxide production by extracellular peroxidase. We suggest that substrate-substrate activation of extracellular peroxidases is important for stress-induced oxidative burst in plant cells.
Chasov
A V
AV
Kazan Institute of Biochemistry and Biophysics, Kazan Science Center, Russian Academy of Sciences, Kazan, 420111, Russia. chasov@mail.knc.ru
Minibayeva
F V
FV
D005110:Extracellular Space / Q000201:enzymology / Q000378:metabolism; D010544:Peroxidases / Q000378:metabolism*; D010636:Phenols / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism*; D018517:Plant Roots / Q000201:enzymology / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism*; D014908:Triticum / Q000201:enzymology* / Q000378:metabolism
D010636:Phenols; D010940:Plant Proteins; D013481:Superoxides; D010544:Peroxidases