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Although this metabolic state has been recognized for decades, its bioenergetic advantages remain unclear, as fermentation produces less net ATP than mitochondrial respiration. How aerobic fermentation contributes to cellular energy balance therefore remains unresolved. Here, we show that extracellular acidification generated by lactate export creates a proton gradient across the plasma membrane that is harnessed by ectopic ATP synthases to drive intracellular ATP production. We find that ATP synthase and proton-shuttling components of the mitochondrial respiratory chain translocate to the plasma membrane in cancer cells and are preferentially oriented to exploit this gradient, linking a hallmark of aerobic fermentation directly to energy supplementation. This work provides a mechanistic resolution to the apparent energetic inefficiency of the Warburg paradigm and identifies a previously unrecognized pathway for energy complementation in cancer.<\/jats:p>","DOI":"10.64898\/2026.05.19.726308","type":"posted-content","created":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T15:35:47Z","timestamp":1779377747000},"source":"Crossref","is-referenced-by-count":0,"title":["Surface Complex V couples proton gradient across the plasma membrane to ATP production in cancer"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4688-1192","authenticated-orcid":false,"given":"Samantha A.","family":"McLaughlin","sequence":"first","affiliation":[{"name":"Department of Ophthalmology and Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA"},{"name":"Sylvester Comprehensive Cancer Center, University of Miami Miller School of Medicine, Miami, FL, USA"},{"name":"Medical Scientist Training Program (MSTP), University of Miami Miller School of Medicine. 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