ArticleFEMS microbiology ecology2026
Electrogenic CH4 oxidation on a bioanode: putative extracellular electron transport system in Methylobacter sp.
Article in FEMS microbiology ecology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Aerobic methanotrophs are frequently detected in oxygen-limited, stratified coastal environments. Known adaptations, including high-affinity terminal oxidases and oxygen-binding bacteriohemerythrins, help explain methane oxidation at extremely low oxygen concentrations, yet their activity and ecological role under fully anoxic conditions remain uncertain. Here, we show that an anoxic, poised-anode bioelectrochemical system inoculated with a methane-oxidizing sediment enrichment produced methane-dependent current, with rapid current loss upon methane removal and recovery after re-addition. Metagenomic analysis revealed the selective enrichment of a Methylobacter population encoding a porin-cytochrome complex and numerous multiheme c-type cytochromes, suggesting extracellular electron transfer potential. A complementary phylogenomic survey across Methylococcales identified homologs of this gene cluster in multiple lineages, but with a scattered phylogenetic distribution indicative of modular acquisition. Comparative synteny further revealed conserved gene order across genomes, supporting horizontal transfer of the locus as a functional unit. Together, these results demonstrate that aerobic methanotrophs may employ extracellular electron transfer strategies to dissipate methane-derived electrons when oxygen-dependent respiration is constrained.
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