Generation of OH radical during enzymatic reduction of 9,10-anthraquinone-2-sulphonate. Can semiquinone decompose hydrogen peroxide?

Autor: Sushkov DG; Institute of Chemical Kinetics and Combustion, Novosibirsk, USSR., Gritsan NP, Weiner LM
Jazyk: angličtina
Zdroj: FEBS letters [FEBS Lett] 1987 Dec 10; Vol. 225 (1-2), pp. 139-44.
DOI: 10.1016/0014-5793(87)81146-8
Abstrakt: Spin-trapping experiments have shown that 9,10-anthraquinone-2-sulphonate (AQS) can be reduced enzymatically with NADPH-cytochrome P-450 reductase (FP) producing OH radicals. It has been revealed for the first time that the radical anion of AQS cannot decompose H2O2 as indicated by flash-photolysis data. From the experimental results obtained it follows that an enzyme system containing NADPH, AQS and FP produces both accumulation of H2O2 from molecular oxygen and reduction of Fe3+ to Fe2+ which decomposes H2O2 catalytically via a Fenton reaction.
Databáze: MEDLINE