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• W2080474405 abstract "H2O2 production by skeletal muscle mitochondria oxidizing palmitoylcarnitine was examined under two conditions: the absence of respiratory chain inhibitors and the presence of myxothiazol to inhibit complex III. Without inhibitors, respiration and H2O2 production were low unless carnitine or malate was added to limit acetyl-CoA accumulation. With palmitoylcarnitine alone, H2O2 production was dominated by complex II (44% from site IIF in the forward reaction); the remainder was mostly from complex I (34%, superoxide from site IF). With added carnitine, H2O2 production was about equally shared between complexes I, II, and III. With added malate, it was 75% from complex III (superoxide from site IIIQo) and 25% from site IF. Thus complex II (site IIF in the forward reaction) is a major source of H2O2 production during oxidation of palmitoylcarnitine ± carnitine. Under the second condition (myxothiazol present to keep ubiquinone reduced), the rates of H2O2 production were highest in the presence of palmitoylcarnitine ± carnitine and were dominated by complex II (site IIF in the reverse reaction). About half the rest was from site IF, but a significant portion, ∼40pmol H2O2·min(-1)·mg protein(-1), was not from complex I, II, or III and was attributed to the proteins of β-oxidation (electron-transferring flavoprotein (ETF) and ETF-ubiquinone oxidoreductase). The maximum rate from the ETF system was ∼200pmol H2O2·min(-1)·mg protein(-1) under conditions of compromised antioxidant defense and reduced ubiquinone pool. Thus complex II and the ETF system both contribute to H2O2 productionduring fatty acid oxidation under appropriate conditions." @default.
• W2080474405 created "2016-06-24" @default.
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• W2080474405 date "2013-08-01" @default.
• W2080474405 modified "2023-10-04" @default.
• W2080474405 title "Sites of superoxide and hydrogen peroxide production during fatty acid oxidation in rat skeletal muscle mitochondria" @default.
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• W2080474405 doi "https://doi.org/10.1016/j.freeradbiomed.2013.04.006" @default.
• W2080474405 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3871980" @default.
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