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Molecular basis of diseases caused by the mtDNA mutation m.8969G>A in the subunit a of ATP synthase

Skoczen, N. and Dautant, A. and Binko, Krystyna and Godard, Franc¸ois and Bouhier, Marine and SU, Xin and Lasserre, Jean-Paul and Giraud, Marie-France and Tribouillard-Tanvier, D. and Chen, Huimei and di Rago, Jean-Paul and Kucharczyk, Roza (2018) Molecular basis of diseases caused by the mtDNA mutation m.8969G>A in the subunit a of ATP synthase. BBA Bioenergetics, 1859 (8). pp. 602-611. ISSN 0005-2728

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Official URL: https://www.ncbi.nlm.nih.gov/pubmed/29778688

Abstract

The ATP synthase which provides aerobic eukaryotes with ATP, organizes into a membrane-extrinsic catalytic domain, where ATP is generated, and a membrane-embedded FO domain that shuttles protons across the membrane. We previously identified a mutation in the mitochondrial MT-ATP6 gene (m.8969G>A) in a 14-year-old Chinese female who developed an isolated nephropathy followed by brain and muscle problems. This mutation replaces a highly conserved serine residue into asparagine at amino acid position 148 of the membrane-embedded subunit a of ATP synthase. We showed that an equivalent of this mutation in yeast (aS175N) prevents FO-mediated proton translocation. Herein we identified four first-site intragenic suppressors (aN175D, aN175K, aN175I, and aN175T), which, in light of a recently published atomic structure of yeast FO indicates that the detrimental consequences of the original mutation result from the establishment of hydrogen bonds between aN175 and a nearby glutamate residue (aE172) that was proposed to be critical for the exit of protons from the ATP synthase towards the mitochondrial matrix. Interestingly also, we found that the aS175N mutation can be suppressed by second-site suppressors (aP12S, aI171F, aI171N, aI239F, and aI200M), of which some are very distantly located (by 20-30 Å) from the original mutation. The possibility to compensate through long-range effects the aS175N mutation is an interesting observation that holds promise for the development of therapeutic molecules.

Item Type:Article
Subjects:Q Science > Q Science (General)
R Medicine > R Medicine (General)
R Medicine > RB Pathology
Divisions:Department of Genetics
ID Code:1552
Deposited By: Dr hab Roza Kucharczyk
Deposited On:19 Oct 2018 08:40
Last Modified:19 May 2019 22:05

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