Title:
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MICU1 confers protection from MCU-dependent manganese toxicity
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Author:
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Wettmarshausen, Jennifer; Goh, Valerie; Huang, Kai-Ting; Arduino, Daniela M.; Tripathi, Utkarsh; Leimpek, Anja; Cheng, Yiming; Pittis, Alexandros, 1982-; Gabaldón Estevan, Juan Antonio, 1973-; Mokranjac, Dejana; Hajnóczky, György; Perocchi, Fabiana
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Abstract:
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The mitochondrial calcium uniporter is a highly selective ion channel composed of species- and tissue-specific subunits. However, the functional role of each component still remains unclear. Here, we establish a synthetic biology approach to dissect the interdependence between the pore-forming subunit MCU and the calcium-sensing regulator MICU1. Correlated evolutionary patterns across 247 eukaryotes indicate that their co-occurrence may have conferred a positive fitness advantage. We find that, while the heterologous reconstitution of MCU and EMRE in vivo in yeast enhances manganese stress, this is prevented by co-expression of MICU1. Accordingly, MICU1 deletion sensitizes human cells to manganese-dependent cell death by disinhibiting MCU-mediated manganese uptake. As a result, manganese overload increases oxidative stress, which can be effectively prevented by NAC treatment. Our study identifies a critical contribution of MICU1 to the uniporter selectivity, with important implications for patients with MICU1 deficiency, as well as neurological disorders arising upon chronic manganese exposure. |
Abstract:
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We acknowledge support from the German Research Foundation (DFG) under the Emmy Noether Programme (PE 2053/1-1 to F.P. and J.W.), the Munich Center for Systems Neurology (SyNergy EXC 1010 to F.P.), the Juniorverbund in der Systemmedizin “mitOmics” (FKZ 01ZX1405B to V.G. and A.L.), The Bert L & N Kuggie Vallee Foundation (to F.P. and D.M.A.), the DFG (MO1944/1-2 to D.M.), the Spanish Ministry of Economy, Industry, and Competitiveness (MEIC; BFU2015-67107), the European Union’s Horizon 2020 research and innovation program under grant agreement ERC-2016-724173 (to T.G. and A.A.P.), and the NIH (RO1 GM102724 to G.H.). |
Subject(s):
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-Mitochondria -Calcium -MCU -MICU1 -Yeast -Manganese -Signaling |
Rights:
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© 2018 The Author(s). This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
http://creativecommons.org/licenses/by/4.0/ |
Document type:
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Article Article - Published version |
Published by:
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Elsevier
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