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• W3131949760 abstract "The human ATP synthase is an assembly of 29 subunits of 18 different types, of which only two (a and 8) are encoded in the mitochondrial genome. Subunit a, together with an oligomeric ring of c-subunit (c-ring), forms the proton pathway responsible for the transport of protons through the mitochondrial inner membrane, coupled to rotation of the c-ring and ATP synthesis. Neuromuscular diseases have been associated to a number of mutations in the gene encoding subunit a, ATP6. The most common, m.8993 T > G, leads to replacement of a strictly conserved leucine residue with arginine (aL156R). We previously showed that the equivalent mutation (aL173R) dramatically compromises respiratory growth of Saccharomyces cerevisiae and causes a 90% drop in the rate of mitochondrial ATP synthesis. Here, we isolated revertants from the aL173R strain that show improved respiratory growth. Four first-site reversions at codon 173 (aL173M, aL173S, aL173K and aL173W) and five second-site reversions at another codon (aR169M, aR169S, aA170P, aA170G and aI216S) were identified. Based on the atomic structures of yeast ATP synthase and the biochemical properties of the revertant strains, we propose that the aL173R mutation is responsible for unfavorable electrostatic interactions that prevent the release of protons from the c-ring into a channel from which protons move from the c-ring to the mitochondrial matrix. The results provide further evidence that yeast aL173 (and thus human aL156) optimizes the exit of protons from ATP synthase, but is not essential despite its strict evolutionary conservation." @default.
• W3131949760 created "2021-03-01" @default.
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• W3131949760 date "2021-02-18" @default.
• W3131949760 modified "2023-10-14" @default.
• W3131949760 title "The pathogenic m.8993 T &gt; G mutation in mitochondrial <i>ATP6</i> gene prevents proton release from the subunit <i>c</i>-ring rotor of ATP synthase" @default.
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• W3131949760 doi "https://doi.org/10.1093/hmg/ddab043" @default.
• W3131949760 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8098111" @default.
• W3131949760 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33600551" @default.
• W3131949760 hasPublicationYear "2021" @default.
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