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Methylselenol Produced In Vivo from Methylseleninic Acid or Dimethyl Diselenide Induces Toxic Protein Aggregation in Saccharomyces cerevisiae

Marc Dauplais 1 Katarzyna Bierla 2 Coralie Maizeray Roxane Lestini 3 Ryszard Lobinski 2 Pierre Plateau 1 Joanna Szpunar 2 Myriam Lazard 4, *
* Corresponding author
1 BIOC - Laboratoire de Biochimie de l'Ecole polytechnique
2 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
3 LOB - Laboratoire d'Optique et Biosciences
4 BIOC - Laboratoire de Biologie Structurale de la Cellule
Abstract : Methylselenol (MeSeH) has been suggested to be a critical metabolite for anticancer activity of selenium, although the mechanisms underlying its activity remain to be fully established. The aim of this study was to identify metabolic pathways of MeSeH in Saccharomyces cerevisiae to decipher the mechanism of its toxicity. We first investigated in vitro the formation of MeSeH from methylseleninic acid (MSeA) or dimethyldiselenide. Determination of the equilibrium and rate constants of the reactions between glutathione (GSH) and these MeSeH precursors indicates that in the conditions that prevail in vivo, GSH can reduce the major part of MSeA or dimethyldiselenide into MeSeH. MeSeH can also be enzymatically produced by glutathione reductase or thioredoxin/thioredoxin reductase. Studies on the toxicity of MeSeH precursors (MSeA, dimethyldiselenide or a mixture of MSeA and GSH) in S.cerevisiae revealed that cytotoxicity and selenomethionine content were severely reduced in a met17 mutant devoid of O-acetylhomoserine sulfhydrylase. This suggests conversion of MeSeH into selenomethionine by this enzyme. Protein aggregation was observed in wild-type but not in met17 cells. Altogether, our findings support the view that MeSeH is toxic in S. cerevisiae because it is metabolized into selenomethionine which, in turn, induces toxic protein aggregation.
Keywords : toxicity protein aggregation Saccharomyces cerevisiae metabolism redox equilibrium thiol/disulfide exchange methylseleninic acid diselenide methylselenol
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https://hal-polytechnique.archives-ouvertes.fr/hal-03212042
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Submitted on : Friday, April 30, 2021 - 8:33:20 AM
Last modification on : Saturday, February 5, 2022 - 2:18:03 PM
Long-term archiving on: : Saturday, July 31, 2021 - 6:12:08 PM

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Marc Dauplais, Katarzyna Bierla, Coralie Maizeray, Roxane Lestini, Ryszard Lobinski, et al.. Methylselenol Produced In Vivo from Methylseleninic Acid or Dimethyl Diselenide Induces Toxic Protein Aggregation in Saccharomyces cerevisiae. International Journal of Molecular Sciences, MDPI, 2021, 22 (5), pp.2241. ⟨10.3390/ijms22052241⟩. ⟨hal-03212042⟩

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