{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T14:40:36Z","timestamp":1774276836756,"version":"3.50.1"},"reference-count":37,"publisher":"The Company of Biologists","issue":"1","license":[{"start":{"date-parts":[[1990,3,1]],"date-time":"1990-03-01T00:00:00Z","timestamp":636249600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/www.biologists.com\/user-licence-1-1\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1990,3,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>Isolated mitochondria of the bivalve Solemya reidi Bernard oxidize sulphide and couple this oxidation to ADP phosphorylation. The products of mitochondrial sulphide oxidation were analyzed by HPLC using monobromobimane derivatization. Concurrent measurements of respiration were made using sulphideinsensitive oxygen electrodes. 5. reidi mitochondria oxidized sulphide exclusively to thiosulphate. The reaction occurred in two steps. One sulphide molecule was first oxidized to sulphite. A second molecule of sulphide was then added oxidatively to form the free product thiosulphate. This oxidation was obligately linked to mitochondrial electron transport and could be inhibited by the cytochrome c oxidase inhibitor hydrogen cyanide, or by low oxygen concentration. The site II inhibitor antimycin A did not inhibit thiosulphate production, indicating that sulphide oxidation is linked through only one ATP coupling site (site III). A calculation of the respiratory potential for ATP synthesis by fully intact mitochondria indicated that 2.0\u20133.25 ATP per sulphide may be synthesized using the proton potential generated by sulphide oxidation. This estimate far exceeds the published phosphorylation ratios for S. reidi (0.5\u20131.2 ATP per sulphide). This difference may be accounted for by partial uncoupling of phosphorylation from sulphide-based respiration. This hypothesis is supported by the observation that the respiratory control ratio of mitochondria respiring on sulphide is 41 % lower than that of mitochondria respiring on succinate. The respiratory control ratio is an index of the tightness of coupling of respiration to ADP phosphorylation. When the adenylate pool of a eukaryotic cell is mostly phosphorylated, respiration is very slow, owing to the maintenance of a high mitochondrial membrane potential. Uncoupling of oxidative phosphorylation from respiration would be an adaptive advantage to the animal in that it allows for continuous, rapid removal of the toxic molecule hydrogen sulphide.<\/jats:p>","DOI":"10.1242\/jeb.149.1.133","type":"journal-article","created":{"date-parts":[[2021,4,25]],"date-time":"2021-04-25T02:54:57Z","timestamp":1619319297000},"page":"133-148","source":"Crossref","is-referenced-by-count":57,"title":["Production of thiosulphate during sulphide oxidation by mitochondria of the symbiont-containing bivalve <i>Solemya reidi<\/i>"],"prefix":"10.1242","volume":"149","author":[{"given":"John","family":"O\u2019Brien","sequence":"first","affiliation":[{"name":"University of California at San Diego 1 Department of Biology , , La Jolla 92093"},{"name":"University of California at San Diego 2 Scripps Institution of Oceanography , , La Jolla, CA 92093, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Russell D.","family":"Vetter","sequence":"additional","affiliation":[{"name":"University of California at San Diego 2 Scripps Institution of Oceanography , , La Jolla, CA 92093, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"237","published-online":{"date-parts":[[1990,3,1]]},"reference":[{"key":"2023121022255053700_JEXBIO_149_1_133C1","doi-asserted-by":"publisher","first-page":"5296","DOI":"10.1073\/pnas.75.11.5296","article-title":"Stoichiometry of vectorial H+ movements coupled to electron transport and to ATP synthesis in mitochondria","volume":"75","author":"Alexandre","year":"1978","journal-title":"Proc. natn. 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