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Depletion of thiol reducing capacity impairs cytosolic but not mitochondrial iron-sulfur protein assembly machineries.

Identifieur interne : 000177 ( Main/Exploration ); précédent : 000176; suivant : 000178

Depletion of thiol reducing capacity impairs cytosolic but not mitochondrial iron-sulfur protein assembly machineries.

Auteurs : Joseph J. Braymer [Allemagne] ; Martin Stümpfig [Allemagne] ; Stefanie Thelen [Allemagne] ; Ulrich Mühlenhoff [Allemagne] ; Roland Lill [Allemagne]

Source :

RBID : pubmed:30419257

Descripteurs français

English descriptors

Abstract

Iron‑sulfur (Fe/S) clusters are versatile inorganic cofactors that play central roles in essential cellular functions, from respiration to genome stability. >30 proteins involved in Fe/S protein biogenesis in eukaryotes are known, many of which bind clusters via cysteine residues. This opens up the possibility that the thiol-reducing glutaredoxin and thioredoxin systems are required at both the Fe/S biogenesis and target protein level to counteract thiol oxidation. To address the possible interplay of thiol redox chemistry and Fe/S protein biogenesis, we have characterized the status of the mitochondrial (ISC) and cytosolic (CIA) Fe/S protein assembly machineries in Saccharomyces cerevisiae mutants in which the three partially redundant glutathione (Glr1) and thioredoxin (Trr1 and Trr2) oxidoreductases have been inactivated in either mitochondria, cytosol, or both compartments. Cells devoid of mitochondrial oxidoreductases maintained a functional mitochondrial ISC machinery and showed no altered iron homeostasis despite a non-functional complex II of the respiratory chain due to redox-specific defects. In cells that lack either cytosolic or total cellular thiol reducing capacity, both the ISC system and iron homeostasis were normal, yet cytosolic and nuclear Fe/S target proteins were not matured. This dysfunction could be attributed to a failure in the assembly of [4Fe‑4S] clusters in the CIA factor Nar1, even though Nar1 maintained robust protein levels and stable interactions with later-acting CIA components. Overall, our analysis has uncovered a hitherto unknown thiol-dependence of the CIA machinery and has demonstrated the surprisingly varying sensitivity of Fe/S proteins to thiol oxidation.

DOI: 10.1016/j.bbamcr.2018.11.003
PubMed: 30419257


Affiliations:


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Le document en format XML

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<term>Saccharomyces cerevisiae (génétique)</term>
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<div type="abstract" xml:lang="en">Iron‑sulfur (Fe/S) clusters are versatile inorganic cofactors that play central roles in essential cellular functions, from respiration to genome stability. >30 proteins involved in Fe/S protein biogenesis in eukaryotes are known, many of which bind clusters via cysteine residues. This opens up the possibility that the thiol-reducing glutaredoxin and thioredoxin systems are required at both the Fe/S biogenesis and target protein level to counteract thiol oxidation. To address the possible interplay of thiol redox chemistry and Fe/S protein biogenesis, we have characterized the status of the mitochondrial (ISC) and cytosolic (CIA) Fe/S protein assembly machineries in Saccharomyces cerevisiae mutants in which the three partially redundant glutathione (Glr1) and thioredoxin (Trr1 and Trr2) oxidoreductases have been inactivated in either mitochondria, cytosol, or both compartments. Cells devoid of mitochondrial oxidoreductases maintained a functional mitochondrial ISC machinery and showed no altered iron homeostasis despite a non-functional complex II of the respiratory chain due to redox-specific defects. In cells that lack either cytosolic or total cellular thiol reducing capacity, both the ISC system and iron homeostasis were normal, yet cytosolic and nuclear Fe/S target proteins were not matured. This dysfunction could be attributed to a failure in the assembly of [4Fe‑4S] clusters in the CIA factor Nar1, even though Nar1 maintained robust protein levels and stable interactions with later-acting CIA components. Overall, our analysis has uncovered a hitherto unknown thiol-dependence of the CIA machinery and has demonstrated the surprisingly varying sensitivity of Fe/S proteins to thiol oxidation.</div>
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<Keyword MajorTopicYN="Y">Glutathione oxidoreductase</Keyword>
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<Keyword MajorTopicYN="Y">Iron‑sulfur clusters</Keyword>
<Keyword MajorTopicYN="Y">Saccharomyces cerevisiae</Keyword>
<Keyword MajorTopicYN="Y">Thiol redox chemistry</Keyword>
<Keyword MajorTopicYN="Y">Thioredoxin oxidoreductase</Keyword>
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<Year>2018</Year>
<Month>11</Month>
<Day>01</Day>
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