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)

Institut für Astrophysik, Institut für Geologie

Externe Organisation(en)

Johannes Kepler Universität Linz, Krajete GmbH, Austria, Universität Bremen, Universität Hamburg

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

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 105105 Geochemie, 106022 Mikrobiologie

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie, Allgemeine Chemie, Allgemeine Biochemie, Genetik und Molekularbiologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/cde6fab1-979b-4b99-9724-9a5490effeee