Abstract
Summary: Propionate inhibits oxygen consumption by rat liver mitochondria when glutamate, α-ketaglutarate, and succinate are substrates. Carnitine prevents this effect. The pattern of inhibition of 14CO2 release from metabolic intermediates indicates citric acid cycle inhibition between succinate:coenzyme A (CoA) ligase (GDP) and malate dehydrogenase. Propionyl CoA is synthesized from propionate in mitochondria. Propionyl CoA is a potent inhibitor of succinate:CoA ligase with positive cooperativity and half-maximal inhibition at 2 ± 10−4 M propionyl CoA.
Speculation: Inhibition of oxidative phosphorylation and the citric acid cycle may produce the Reye's-like syndrome which occurs in propionic acidemia and possibly related organic acid or mitochondrial disorders. Mitochondrial acyl coenzyme A may be increased in these patients and respond favorably to carnitine therapy.
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Stumpf, D., Mcafee, J., Parks, J. et al. Propionate Inhibition of Succinate: CoA Ligase (GDP) and the Citric Acid Cycle in Mitochondria. Pediatr Res 14, 1127–1131 (1980). https://doi.org/10.1203/00006450-198010000-00008
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DOI: https://doi.org/10.1203/00006450-198010000-00008
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