Sulfide oxidation coupled to ATP synthesis in chicken liver mitochondria

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
R Yong, D G Searcy

Abstract

Chicken liver mitochondria consumed O2 at an accelerated rate when supplied with low concentrations of hydrogen sulfide. Maximum respiration occurred in 10 microM sulfide, and continued more slowly up to concentrations as high as 60 microM. Sulfide oxidation was coupled to adenosine triphosphate (ATP) synthesis, as shown by firefly luciferase luminescence and by measurement of the mitochondrial membrane electrochemical gradient. Synthesis of ATP required low, steady-state concentrations of sulfide (< 5 microM), which were maintained by use of a syringe pump. The ratio of consumed O2 to sulfide changed at low sulfide and O2 concentrations, indicating alternative metabolic reactions and products. In low concentrations of sulfide, presumably most similar to physiological, the O2/sulfide ratio was 0.75. This is the first report of sulfide oxidation linked to ATP synthesis in any organism not specifically adapted to a sulfide-rich environment. We suggest that this may be a widespread mitochondrial trait, and that it is consistent with the hypothesis that mitochondria originated from sulfide-oxidizing symbionts.

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