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pubmed-article:1715764pubmed:abstractTextThe gramicidin channel contains a single strand of water molecules associated through hydrogen bonds. Previous work has shown that channels of similar size are formed by association of transmembrane alpha helices of synthetic leucine-serine peptides. Both types of channels translocate protons with considerable selectivity relative to other cations, and it has been proposed that the selectivity arises by proton "hopping" along hydrogen-bonded chains of water, whereas other cations must cross by ordinary diffusion processes. It is possible that a similar mechanism underlies proton transport in the Fo subunit of the F1F0 ATP synthase. Using the gramicidin channel as a model, we have tested whether a single strand of water is kinetically competent to translocate protons at a rate sufficient to support known rates of ATP synthesis. We found that the gramicidin channel saturates at approximately 530 pS of protonic current in 4 M HCl, more than sufficient for typical ATP synthesis rates. It follows that proton diffusion to a putative channel in Fo, rather than the channel itself, may limit ATP synthesis rates.lld:pubmed
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pubmed-article:1715764pubmed:authorpubmed-author:DeamerD WDWlld:pubmed
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pubmed-article:1715764pubmed:articleTitleProton conductance by the gramicidin water wire. Model for proton conductance in the F1F0 ATPases?lld:pubmed
pubmed-article:1715764pubmed:affiliationDepartment of Zoology, University of California, Davis 95616.lld:pubmed
pubmed-article:1715764pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1715764pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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