Activated oxygen generation from thylakoids: a novel spin trap.

Abstract:

:Using a novel phosphorylated spin trap, 5-(diethoxyphosphoryl)-5-methyl-1-pyrroline-N-oxide (DEPMPO), an analogue of the commonly used spin trap 5,5'-dimethyl-1-pyrroline N-oxide (DMPO), we have investigated the production of oxygen radical species under illumination of thylakoids from wheat (Triticum durum Desf cv. Ofanto). DEPMPO reacted with superoxide (O2*-) and hydroxyl radical (HO*) forming distinctive spin trap adducts. Spectra of (O2*-) and HO* adducts of DEPMPO were recorded in the presence of xanthine/xanthine oxidase and FeSO4/H2O2, respectively, and computer simulation of spectra was performed. During illumination of thylakoids both O2*- and HO* were detected as well. Transition metals catalysed transformation of O2*- into HO*. The conversion was enhanced by H2O2 and prevented by exogenous superoxide dismutase and catalase. The presence of a thylakoid-bound superoxide dismutase, whose activity was inhibited by H2O2 and diethyldithiocarbamic acid, was responsible for H2O2 production from O2*- and thus for HO* generation.

journal_name

Free Radic Res

journal_title

Free radical research

authors

Sgherri CL,Pinzino C,Samaritani E,Navari-Izzo F

doi

10.1080/10715769900301511

keywords:

subject

Has Abstract

pub_date

1999-12-01 00:00:00

pages

S199-204

eissn

1071-5762

issn

1029-2470

journal_volume

31 Suppl

pub_type

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