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Science 1 August 1986:
Vol. 233. no. 4763, pp. 563 - 566
DOI: 10.1126/science.233.4763.563
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Articles

Hydrogen Sulfide Oxidation Is Coupled to Oxidative Phosphorylation in Mitochondria of Solemya reidi

MARK A. POWELL 1 and GEORGE N. SOMERO 1

1 Marine Biology Research Division, A-002, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093.

Solemya reidi, a gutless clam found in sulfide-rich habitats, contains within its gills bacterial symbionts thought to oxidize sulfur compounds and provide a reduced carbon food source to the clam. However, the initial step or steps in sulfide oxidation occur in the animal tissue, and mitochondria isolated from both gill and symbiont-free foot tissue of the clam coupled the oxidation of sulfide to oxidative phosphorylation [adenosine triphosphate (ATP) synthesis]. The ability of Solmya reidi to exploit directly the energy in sulfide for ATP synthesis is unprecedented, and suggests that sulfide-habitat animals that lack bacterial symbionts may also use sulfide as an inorganic energy source.

Submitted on February 13, 1986
Accepted on June 13, 1986


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