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Autoregulatory control of mitochondrial glutathione homeostasis

  • Yuyang Liu
  • , Shanshan Liu
  • , Anju Tomar
  • , Frederick S. Yen
  • , Gokhan Unlu
  • , Nathalie Ropek
  • , Ross A. Weber
  • , Ying Wang
  • , Artem Khan
  • , Mark Gad
  • , Junhui Peng
  • , Erdem Terzi
  • , Hanan Alwaseem
  • , Alexandra E. Pagano
  • , Søren Heissel
  • , Henrik Molina
  • , Benjamin Allwein
  • , Timothy C. Kenny
  • , Richard L. Possemato
  • , Li Zhao
  • Richard K. Hite, Ekaterina V. Vinogradova, Sheref S. Mansy, Kıvanç Birsoy

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

Mitochondria must maintain adequate amounts of metabolites for protective and biosynthetic functions. However, how mitochondria sense the abundance of metabolites and regulate metabolic homeostasis is not well understood. In this work, we focused on glutathione (GSH), a critical redox metabolite in mitochondria, and identified a feedback mechanism that controls its abundance through the mitochondrial GSH transporter, SLC25A39. Under physiological conditions, SLC25A39 is rapidly degraded by mitochondrial protease AFG3L2. Depletion of GSH dissociates AFG3L2 from SLC25A39, causing a compensatory increase in mitochondrial GSH uptake. Genetic and proteomic analyses identified a putative iron-sulfur cluster in the matrix-facing loop of SLC25A39 as essential for this regulation, coupling mitochondrial iron homeostasis to GSH import. Altogether, our work revealed a paradigm for the autoregulatory control of metabolic homeostasis in organelles.

Original languageEnglish
Pages (from-to)820-828
Number of pages9
JournalScience
Volume382
Issue number6672
DOIs
StatePublished - 17 Nov 2023
Externally publishedYes

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