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. 1993 May 15;292(Pt 1):23–30. doi: 10.1042/bj2920023

Mitochondrial short-chain acyl-CoA dehydrogenase of human liver and kidney can function as an oxidase.

G Vanhove 1, P P Van Veldhoven 1, H J Eyssen 1, G P Mannaerts 1
PMCID: PMC1134263  PMID: 8503850

Abstract

During an attempt to purify the peroxisomal acyl-CoA oxidases from human liver and kidney, we discovered a novel short-chain acyl-CoA oxidase, which was well separated from the known peroxisomal oxidases on various chromatographic columns. However, further experiments demonstrated that the novel oxidase is identical with the mitochondrial short-chain acyl-CoA dehydrogenase. (1) Subcellular fractionation revealed that the short-chain acyl-CoA oxidase is present in mitochondria and absent from peroxisomes. (2) The molecular mass (43 kDa) of the subunit of the purified oxidase was similar to that reported for the dehydrogenase. (3) The substrate spectrum of the oxidase was comparable with that described for the dehydrogenase. (4) On column chromatography, the oxidase and dehydrogenase activities co-eluted. Our results indicate that, in the absence of suitable electron acceptors, the short-chain acyl-CoA dehydrogenase is capable of transferring electrons directly to molecular oxygen, yielding potentially harmful H2O2. This raises the question as to whether the dehydrogenase might function as an oxidase in conditions in which the activity of the electron-transport chain is decreased, such as reperfusion after ischaemia.

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Selected References

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