{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,19]],"date-time":"2026-10-19T23:46:15Z","timestamp":1792453575735,"version":"4.5.0"},"reference-count":77,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T00:00:00Z","timestamp":1761177600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell Dev. Biol."],"abstract":"<jats:p>Sulfide:quinone oxidoreductase (SQOR) is an inner-mitochondrial-membrane enzyme that couples hydrogen sulfide oxidation to the coenzyme Q pool, thereby linking sulfur metabolism with cellular bioenergetics and redox control. Recent structural and mechanistic advances\u2014most notably the catalytic cysteine trisulfide\u2014clarify how membrane context and substrate availability tune catalytic flux, yet debate persists over the physiological sulfur acceptor (glutathione versus sulfite) and how microenvironments route sulfide. SQOR also shapes ferroptosis: by using hydrogen selenide to reduce ubiquinone, it elevates ubiquinol and suppresses lipid peroxidation independently of glutathione peroxidase-4. We synthesize cross-system disease evidence\u2014brain (hypoxia\/ischemia, neuroinflammation), heart (divergent roles in acute ischemia\u2013reperfusion versus chronic failure), kidney (mitochondrial dysfunction and cGAS\u2013STING(cyclic GMP\u2013AMP synthase\u2013stimulator of interferon genes)\u2013driven fibrosis), gastrointestinal tract (stage-specific effects in colorectal cancer and impaired detoxification in ulcerative colitis), bone\/metabolic disorders, and the male reproductive system\u2014highlighting SQOR\u2019s bidirectional pathology when hydrogen sulfide is excessive or depleted. Viewing SQOR as a \u201cmetabolic rheostat\u201d reconciles these paradoxes and underscores therapeutic opportunities: metabolic supplementation (e.g., coenzyme Q10), selective inhibition or activation, and context-matched modulation. We further propose companion diagnostics that quantify sulfur\/selenium species and enzyme activity to enable patient stratification and de-risk clinical translation.<\/jats:p>","DOI":"10.3389\/fcell.2025.1685252","type":"journal-article","created":{"date-parts":[[2025,10,23]],"date-time":"2025-10-23T05:39:09Z","timestamp":1761197949000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":10,"title":["SQOR as a metabolic rheostat of H2S: structure, redox homeostasis, and disease therapy"],"prefix":"10.3389","volume":"13","author":[{"given":"Ming-Hui","family":"Peng","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kai-Lun","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhong-Wu","family":"Ma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"He-Wei","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shi-Wei","family":"Guan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hai-Bo","family":"Yu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,10,23]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"1066","DOI":"10.1523\/JNEUROSCI.16-03-01066.1996","article-title":"The possible role of hydrogen sulfide as an endogenous neuromodulator","volume":"16","author":"Abe","year":"1996","journal-title":"J. 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