Anomalous peroxidase activity of cytochrome c is the primary pathogenic target in Barth syndrome

Valerian E Kagan*, Yulia Y Tyurina, Karolina Mikulska-Ruminska, Deena Damschroder, Eduardo Vieira Neto, Alessia Lasorsa, Alexander A Kapralov, Vladimir A Tyurin, Andrew A Amoscato, Svetlana N Samovich, Austin B Souryavong, Haider H Dar, Abu Ramim, Zhuqing Liang, Pablo Lazcano, Jiajia Ji, Michael W Schmidtke, Kirill Kiselyov, Aybike Korkmaz, Georgy K VladimirovMargarita A Artyukhova, Pushpa Rampratap, Laura K Cole, Ammanamanchi Niyatie, Emma-Kate Baker, Jim Peterson, Grant M Hatch, Jeffrey Atkinson, Jerry Vockley, Bernhard Kühn, Robert Wessells, Patrick C A van der Wel, Ivet Bahar, Hülya Bayir, Miriam L Greenberg*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
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Abstract

Barth syndrome (BTHS) is a life-threatening genetic disorder with unknown pathogenicity caused by mutations in TAFAZZIN (TAZ) that affect remodeling of mitochondrial cardiolipin (CL). TAZ deficiency leads to accumulation of mono-lyso-CL (MLCL), which forms a peroxidase complex with cytochrome c (cyt c) capable of oxidizing polyunsaturated fatty acid-containing lipids. We hypothesized that accumulation of MLCL facilitates formation of anomalous MLCL-cyt c peroxidase complexes and peroxidation of polyunsaturated fatty acid phospholipids as the primary BTHS pathogenic mechanism. Using genetic, biochemical/biophysical, redox lipidomic and computational approaches, we reveal mechanisms of peroxidase-competent MLCL-cyt c complexation and increased phospholipid peroxidation in different TAZ-deficient cells and animal models and in pre-transplant biopsies from hearts of patients with BTHS. A specific mitochondria-targeted anti-peroxidase agent inhibited MLCL-cyt c peroxidase activity, prevented phospholipid peroxidation, improved mitochondrial respiration of TAZ-deficient C2C12 myoblasts and restored exercise endurance in a BTHS Drosophila model. Targeting MLCL-cyt c peroxidase offers therapeutic approaches to BTHS treatment.

Original languageEnglish
Pages (from-to)2184–2205
Number of pages22
JournalNature Metabolism
Volume5
Early online date23-Nov-2023
DOIs
Publication statusPublished - Dec-2023

Keywords

  • NMR
  • SSNMR
  • Mitochondria

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