Biological methane production under putative Enceladus-like conditions

Autor(en)
Ruth-Sophie Taubner, Patricia Pappenreiter, Jennifer Zwicker, Daniel Smrzka, Christian Pruckner, Philipp Kolar, Sébastien Bernacchi, Arne H Seifert, Alexander Krajete, Wolfgang Bach, Jörn Peckmann, Christian Paulik, Maria G Firneis, Christa Schleper, Simon K-M R Rittmann
Abstrakt

The detection of silica-rich dust particles, as an indication for ongoing hydrothermal activity, and the presence of water and organic molecules in the plume of Enceladus, have made Saturn’s icy moon a hot spot in the search for potential extraterrestrial life. Methanogenic archaea are among the organisms that could potentially thrive under the predicted conditions on Enceladus, considering that both molecular hydrogen (H2) and methane (CH4) have been
detected in the plume. Here we show that a methanogenic archaeon, Methanothermococcus okinawensis, can produce CH4 under physicochemical conditions extrapolated for Enceladus. Up to 72% carbon dioxide to CH4 conversion is reached at 50 bar in the presence of potential inhibitors. Furthermore, kinetic and thermodynamic computations of low-temperature serpentinization indicate that there may be sufficient H2 gas production to serve as a substrate for CH4 production on Enceladus. We conclude that some of the CH4 detected in the plume of Enceladus might, in principle, be produced by methanogens.

Organisation(en)
Department für Ökogenomik und Systembiologie, Institut für Astrophysik, Department für Geodynamik und Sedimentologie
Journal
Nature Communications
Band
9
Anzahl der Seiten
11
ISSN
2041-1723
DOI
https://doi.org/10.1038/s41467-018-02876-y
Publikationsdatum
02-2018
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ÖFOS 2012
103003 Astronomie, 106022 Mikrobiologie, 105105 Geochemie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/biological-methane-production-under-putative-enceladuslike-conditions(cde6fab1-979b-4b99-9724-9a5490effeee).html