Effect of exogenous and endogenous sulfide on the production and the export of methylmercury by sulfate-reducing bacteria.
Cysteine
Mercury
Mercury partitioning
Microbial mercury transformations
Sulfur-containing molecules
hgcA expression
Journal
Environmental science and pollution research international
ISSN: 1614-7499
Titre abrégé: Environ Sci Pollut Res Int
Pays: Germany
ID NLM: 9441769
Informations de publication
Date de publication:
Jan 2023
Jan 2023
Historique:
received:
24
11
2021
accepted:
19
07
2022
pubmed:
12
8
2022
medline:
7
2
2023
entrez:
11
8
2022
Statut:
ppublish
Résumé
Mercury (Hg) is a global pollutant of environmental and health concern; its methylated form, methylmercury (MeHg), is a potent neurotoxin. Sulfur-containing molecules play a role in MeHg production by microorganisms. While sulfides are considered to limit Hg methylation, sulfate and cysteine were shown to favor this process. However, these two forms can be endogenously converted by microorganisms into sulfide. Here, we explore the effect of sulfide (produced by the cell or supplied exogenously) on Hg methylation. For this purpose, Pseudodesulfovibrio hydrargyri BerOc1 was cultivated in non-sulfidogenic conditions with addition of cysteine and sulfide as well as in sulfidogenic conditions. We report that Hg methylation depends on sulfide concentration in the culture and the sulfides produced by cysteine degradation or sulfate reduction could affect the Hg methylation pattern. Hg methylation was independent of hgcA expression. Interestingly, MeHg production was maximal at 0.1-0.5 mM of sulfides. Besides, a strong positive correlation between MeHg in the extracellular medium and the increase of sulfide concentrations was observed, suggesting a facilitated MeHg export with sulfide and/or higher desorption from the cell. We suggest that sulfides (exogenous or endogenous) play a key role in controlling mercury methylation and should be considered when investigating the impact of Hg in natural environments.
Identifiants
pubmed: 35953752
doi: 10.1007/s11356-022-22173-y
pii: 10.1007/s11356-022-22173-y
doi:
Substances chimiques
Methylmercury Compounds
0
Cysteine
K848JZ4886
Mercury
FXS1BY2PGL
Sulfides
0
Sulfates
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
3835-3846Subventions
Organisme : Agence Nationale de la Recherche
ID : iSITE -E2S GoBeam
Informations de copyright
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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