Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON)
Leber’s hereditary optic neuropathy (LHON, MIM#535000) is the most common form of inherited optic neuropathies and mitochondrial DNA-related diseases. The pathogenicity of mutations in genes encoding components of mitochondrial Complex I is well established, but the underlying pathomechanisms of the...
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sg-ntu-dr.10356-1457242023-02-28T17:09:10Z Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) Zhou, Lei Chan, James Chun Yip Chupin, Stephanie Gueguen, Naïg Desquiret-Dumas, Valérie Koh, Siew Kwan Li, Jianguo Gao, Yan Deng, Lu Verma, Chandra Shekhar Beuerman, Roger W. Chan, Eric Chun Yong Milea, Dan Reynier, Pascal School of Biological Sciences Science::Biological sciences Leber’s Hereditary Optic Neuropathy LHON Leber’s hereditary optic neuropathy (LHON, MIM#535000) is the most common form of inherited optic neuropathies and mitochondrial DNA-related diseases. The pathogenicity of mutations in genes encoding components of mitochondrial Complex I is well established, but the underlying pathomechanisms of the disease are still unclear. Hypothesizing that oxidative stress related to Complex I deficiency may increase protein S-glutathionylation, we investigated the proteome-wide S-glutathionylation profiles in LHON (n = 11) and control (n = 7) fibroblasts, using the GluICAT platform that we recently developed. Glutathionylation was also studied in healthy fibroblasts (n = 6) after experimental Complex I inhibition. The significantly increased reactive oxygen species (ROS) production in the LHON group by Complex I was shown experimentally. Among the 540 proteins which were globally identified as glutathionylated, 79 showed a significantly increased glutathionylation (p < 0.05) in LHON and 94 in Complex I-inhibited fibroblasts. Approximately 42% (33/79) of the altered proteins were shared by the two groups, suggesting that Complex I deficiency was the main cause of increased glutathionylation. Among the 79 affected proteins in LHON fibroblasts, 23% (18/79) were involved in energetic metabolism, 31% (24/79) exhibited catalytic activity, 73% (58/79) showed various non-mitochondrial localizations, and 38% (30/79) affected the cell protein quality control. Integrated proteo-metabolomic analysis using our previous metabolomic study of LHON fibroblasts also revealed similar alterations of protein metabolism and, in particular, of aminoacyl-tRNA synthetases. S-glutathionylation is mainly known to be responsible for protein loss of function, and molecular dynamics simulations and 3D structure predictions confirmed such deleterious impacts on adenine nucleotide translocator 2 (ANT2), by weakening its affinity to ATP/ADP. Our study reveals a broad impact throughout the cell of Complex I-related LHON pathogenesis, involving a generalized protein stress response, and provides a therapeutic rationale for targeting S-glutathionylation by antioxidative strategies. Agency for Science, Technology and Research (A*STAR) National Medical Research Council (NMRC) National Supercomputing Centre (NSCC) Singapore Published version The authors are grateful for the grants provided by the Singapore National Medical Research Council (NMRC) Centre, Grants CG 2013 and CG 2017 awarded to the Singapore Eye Research Institute, and the SingHealth Foundation for the proteomics core facility at the Singapore Eye Research Institute. The author also thank A STAR/BMRC and NSCC for support. 2021-01-06T02:44:56Z 2021-01-06T02:44:56Z 2020 Journal Article Zhou, L., Chan, J. C. Y., Chupin, S., Gueguen, N., Desquiret-Dumas, V., Koh, S. K., . . . Reynier, P. (2020). Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON). International Journal of Molecular Sciences, 21(8), 3027-. doi:10.3390/ijms21083027 1661-6596 https://hdl.handle.net/10356/145724 10.3390/ijms21083027 32344771 8 21 en International Journal of Molecular Sciences © 2020 The Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). application/pdf |
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Science::Biological sciences Leber’s Hereditary Optic Neuropathy LHON Zhou, Lei Chan, James Chun Yip Chupin, Stephanie Gueguen, Naïg Desquiret-Dumas, Valérie Koh, Siew Kwan Li, Jianguo Gao, Yan Deng, Lu Verma, Chandra Shekhar Beuerman, Roger W. Chan, Eric Chun Yong Milea, Dan Reynier, Pascal Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) |
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Leber’s hereditary optic neuropathy (LHON, MIM#535000) is the most common form of inherited optic neuropathies and mitochondrial DNA-related diseases. The pathogenicity of mutations in genes encoding components of mitochondrial Complex I is well established, but the underlying pathomechanisms of the disease are still unclear. Hypothesizing that oxidative stress related to Complex I deficiency may increase protein S-glutathionylation, we investigated the proteome-wide S-glutathionylation profiles in LHON (n = 11) and control (n = 7) fibroblasts, using the GluICAT platform that we recently developed. Glutathionylation was also studied in healthy fibroblasts (n = 6) after experimental Complex I inhibition. The significantly increased reactive oxygen species (ROS) production in the LHON group by Complex I was shown experimentally. Among the 540 proteins which were globally identified as glutathionylated, 79 showed a significantly increased glutathionylation (p < 0.05) in LHON and 94 in Complex I-inhibited fibroblasts. Approximately 42% (33/79) of the altered proteins were shared by the two groups, suggesting that Complex I deficiency was the main cause of increased glutathionylation. Among the 79 affected proteins in LHON fibroblasts, 23% (18/79) were involved in energetic metabolism, 31% (24/79) exhibited catalytic activity, 73% (58/79) showed various non-mitochondrial localizations, and 38% (30/79) affected the cell protein quality control. Integrated proteo-metabolomic analysis using our previous metabolomic study of LHON fibroblasts also revealed similar alterations of protein metabolism and, in particular, of aminoacyl-tRNA synthetases. S-glutathionylation is mainly known to be responsible for protein loss of function, and molecular dynamics simulations and 3D structure predictions confirmed such deleterious impacts on adenine nucleotide translocator 2 (ANT2), by weakening its affinity to ATP/ADP. Our study reveals a broad impact throughout the cell of Complex I-related LHON pathogenesis, involving a generalized protein stress response, and provides a therapeutic rationale for targeting S-glutathionylation by antioxidative strategies. |
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School of Biological Sciences |
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School of Biological Sciences Zhou, Lei Chan, James Chun Yip Chupin, Stephanie Gueguen, Naïg Desquiret-Dumas, Valérie Koh, Siew Kwan Li, Jianguo Gao, Yan Deng, Lu Verma, Chandra Shekhar Beuerman, Roger W. Chan, Eric Chun Yong Milea, Dan Reynier, Pascal |
format |
Article |
author |
Zhou, Lei Chan, James Chun Yip Chupin, Stephanie Gueguen, Naïg Desquiret-Dumas, Valérie Koh, Siew Kwan Li, Jianguo Gao, Yan Deng, Lu Verma, Chandra Shekhar Beuerman, Roger W. Chan, Eric Chun Yong Milea, Dan Reynier, Pascal |
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Zhou, Lei |
title |
Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) |
title_short |
Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) |
title_full |
Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) |
title_fullStr |
Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) |
title_full_unstemmed |
Increased protein S-glutathionylation in Leber’s hereditary optic neuropathy (LHON) |
title_sort |
increased protein s-glutathionylation in leber’s hereditary optic neuropathy (lhon) |
publishDate |
2021 |
url |
https://hdl.handle.net/10356/145724 |
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1759856844256313344 |