Glutathione revisited: a vital function in iron metabolism and ancillary role in thiol‐redox control
Introduction
Results
HGT1 overexpression causes toxic accumulation of GSH
Strain | GSH addeda | [GSH] (mM/cell) | [GSSG] (mM/cell) | GSH/GSSG | EGSH (mV) |
---|---|---|---|---|---|
WT | 0 | 7.2±0.04 | 0.21±0.02 | 31±1.25 | −221.78±0.65 |
HGT1 | 0 | 7.59±0.27 | 0.19±0.02 | 38.94±4.94 | −224.02±2.03 |
HGT1 | 50 μM | 35.13±3.49 | 0.9±0.02 | 39.08±4.49 | −244.03±2.88 |
HGT1 | 100 μM | 54.53±4.61 | 1.42±0.06 | 38.86±3.75 | −249.56±2.88 |
gsh1Δ | 100 μM | 2.17±0.07 | 0.08 | 26.72±0.37 | −202.80±0.51 |
gsh1Δ | 1 μM | 0.43±0.05 | 0.03 | 16.49±1.23 | −175.27±2.61 |
gsh1Δ | 0 | 0.06±0.002 | 0.02 | 2.92±0.06 | −125.44±0.52 |
trr1Δ | 0 | 11.46±1.2 | 1.34±0.04 | 8.57±1.11 | −209.69±0.62 |
GSH toxic levels cause both potent UPR and a full iron starvation‐like response
GSH toxic levels inhibit cytoplasmic Fe–S maturation and activate Aft1
High GSH levels cause an UPR by inhibiting ER oxidative protein folding
Alteration of iron metabolism is the pre‐eminent defect caused by GSH depletion
GSH serves as backup of thioredoxin in thiol‐redox maintenance
GSH links thiol‐redox maintenance and iron metabolism
Discussion
The redox‐independent function of GSH in iron metabolism
The redox impact of glutathione
The bases of the essential nature and toxicity of GSH
Conclusions
Materials and methods
Yeast strains, growth conditions and plasmids
Measures of glutathione by LC‐tandem MS
Microarray analysis
Real‐time quantitative PCR
Fluorescence microscopy and flow cytometry
Leu1 and aconitase enzyme assays
Pulse‐chase labelling and immunoprecipitation
Redox western
Supplementary data
Conflict of Interest
Acknowledgements
Supporting Information
References
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