Precipitation of greigite and pyrite induced by Thermococcales: an advantage to live in Fe‐ and S‐rich environments? - Sorbonne Université Accéder directement au contenu
Article Dans Une Revue Environmental Microbiology Année : 2022

Precipitation of greigite and pyrite induced by Thermococcales: an advantage to live in Fe‐ and S‐rich environments?

Résumé

Thermococcales, a major order of archaea inhabiting the iron- and sulfur-rich anaerobic parts of hydrothermal deep-sea vents, have been shown to rapidly produce abundant quantities of pyrite FeS2 in iron-sulfur-rich fluids at 85°C, suggesting that they may contribute to the formation of 'low temperature' FeS2 in their ecosystem. We show that this process operates in Thermococcus kodakarensis only when zero-valent sulfur is directly available as intracellular sulfur vesicles. Whether in the presence or absence of zero-valent sulfur, significant amounts of Fe3 S4 greigite nanocrystals are formed extracellularly. We also show that mineralization of iron sulfides induces massive cell mortality but that concomitantly with the formation of greigite and/or pyrite, a new generation of cells can grow. This phenomenon is observed for Fe concentrations of 5 mM but not higher suggesting that above a threshold in the iron pulse all cells are lysed. We hypothesize that iron sulfides precipitation on former cell materials might induce the release of nutrients in the mineralization medium further used by a fraction of surviving non-mineralized cells allowing production of new alive cells. This suggests that biologically induced mineralization of iron-sulfides could be part of a survival strategy employed by Thermococcales to cope with mineralizing high-temperature hydrothermal environments.
Fichier principal
Vignette du fichier
Environmental Microbiology - 2022 - Gorlas - Precipitation of greigite and pyrite induced by Thermococcales an advantage.pdf (1.53 Mo) Télécharger le fichier
Origine : Publication financée par une institution

Dates et versions

hal-03560043 , version 2 (07-02-2022)
hal-03560043 , version 1 (16-11-2022)

Identifiants

Citer

A. Gorlas, T. Mariotte, L. Morey, C. Truong, S. Bernard, et al.. Precipitation of greigite and pyrite induced by Thermococcales: an advantage to live in Fe‐ and S‐rich environments?. Environmental Microbiology, 2022, 24 (2), pp.626-642. ⟨10.1111/1462-2920.15915⟩. ⟨hal-03560043v2⟩
109 Consultations
109 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More