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- W2091435627 abstract "Summary Quinones are highly toxic naturally occurring thiol‐reactive compounds. We have previously described novel pathways for quinone detoxification in the Gram‐positive bacterium Bacillus subtilis . In this study, we have investigated the extent of irreversible and reversible thiol modifications caused in vivo by electrophilic quinones. Exposure to toxic benzoquinone (BQ) concentrations leads to depletion of numerous Cys‐rich cytoplasmic proteins in the proteome of B. subtilis . Mass spectrometry and immunoblot analyses demonstrated that these BQ‐depleted proteins represent irreversibly damaged BQ aggregates that escape the two‐dimensional gel separation. This enabled us to quantify the depletion of thiol‐containing proteins which are the in vivo targets for thiol‐(S)‐alkylation by toxic quinone compounds. Metabolomic approaches confirmed that protein depletion is accompanied by depletion of the low‐molecular‐weight (LMW) thiol cysteine. Finally, no increased formation of disulphide bonds was detected in the thiol‐redox proteome in response to sublethal quinone concentrations. The glyceraldehyde‐3‐phosphate dehydrogenase (GapA) was identified as the only new target for reversible thiol modifications after exposure to toxic quinones. Together our data show that the thiol‐(S)‐alkylation reaction with protein and non‐protein thiols is the in vivo mechanism for thiol depletion and quinone toxicity in B. subtilis and most likely also in other bacteria." @default.
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- W2091435627 date "2008-08-21" @default.
- W2091435627 modified "2023-10-16" @default.
- W2091435627 title "Depletion of thiol-containing proteins in response to quinones in<i>Bacillus subtilis</i>" @default.
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- W2091435627 doi "https://doi.org/10.1111/j.1365-2958.2008.06382.x" @default.
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