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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Selective inhibition of acyl-CoA dehydrogenases by a metabolite of hypoglycin.

Extracts of liver mitochondria from donor rats given hypoglycin, the toxic amino acid from the ackee plant (Blighia sapida) showed drastically reduced levels of acyl-CoA dehydrogenase activity with butyryl-CoA as substrate. Activity with octanoyl- and palmitoyl-CoA was unaffected. Evidence that the active agent is methylenecyclopropylacetyl-CoA, a hypoglycin metabolite, was obtained by observing effects of the compound on a partially purified enzyme mixture prepared from rabbit liver. At 13 muM concentration, it strongly inhibited butyryl-CoA dehydrogenase (EC with butyryl-CoA as substrate; it was far less effective with palmitoyl-CoA as substrate for the other similar enzymes present in the preparation. Unlike normal substrates of the acyl-CoA dehydrogenases, the compound itself, and not a reaction product, is inhibitory. The observed effect is consistent with quite general inhibition of fatty acid beta-oxidation by hypoglycin.[1]


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