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A non-methanogenic archaeon within the order Methanocellales
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A non-methanogenic archaeon within the order Methanocellales
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Journal Article
A non-methanogenic archaeon within the order Methanocellales
2024
Overview
Serpentinization, a geochemical process found on modern and ancient Earth, provides an ultra-reducing environment that can support microbial methanogenesis and acetogenesis. Several groups of archaea, such as the order
Methanocellales
, are characterized by their ability to produce methane. Here, we generate metagenomic sequences from serpentinized springs in The Cedars, California, and construct a circularized metagenome-assembled genome of a
Methanocellales
archaeon, termed Met12, that lacks essential methanogenesis genes. The genome includes genes for an acetyl-CoA pathway, but lacks genes encoding methanogenesis enzymes such as methyl-coenzyme M reductase, heterodisulfide reductases and hydrogenases. In situ transcriptomic analyses reveal high expression of a multi-heme
c-
type cytochrome, and heterologous expression of this protein in a model bacterium demonstrates that it is capable of accepting electrons. Our results suggest that Met12, within the order
Methanocellales
, is not a methanogen but a CO
2
-reducing, electron-fueled acetogen without electron bifurcation.
Several groups of archaea, such as the order
Methanocellales
, are characterised by their ability to produce methane. Here, Suzuki et al. identify a
Methanocellales
archaeon that lacks essential methanogenesis genes and seems to be instead a CO
2
-reducing, electron-fueled acetogen.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
