Abstract. Anaerobic methanotrophic ‘Candidatus Methanoperedenaceae’ play a key role in mitigating methane emissions from freshwater sediments. Members of t

Gas balance calculations for closed incubations and microcosms.

Marine sponges and ammonia-oxidizing archaea (AOA) represent one of the earliest animal-microbe symbioses. AOA are considered metabolically constrained chemolithoautotrophs that remove nitrogenous was...

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Abstract. Aerobic methanotrophs are frequently detected in oxygen-limited, stratified coastal environments. Known adaptations, including high-affinity term

Acid mine drainage (AMD) waters are a global environmental threat due to their extremely low pH (<3) and high metal loads. Acidophilic sulfate-reducing bacteria (aSRB) can mitigate AMD by reducing sulfate to sulfide, a proton-consuming process that also precipitates metals as metal sulfides. Although sulfate reduction has been observed in AMD waters, most characterized aSRB are only moderately acidophilic. Here, we examined the pH tolerance and proton stress adaptation of the complete organic acid-oxidizing aSRB Acididesulfobacillus acetoxydans. Continuous chemostat cultivations were operated across a pH gradient, reaching steady states from pH 5.0 (optimum) to pH 2.9. In subsequent batch incubations, biomass from a pH 2.9 chemostat remained metabolically active at pH 2.5. Transcriptomic profiles remained remarkably stable across conditions, except for the upregulation of the K+-transporting ATPase (kdpABC) at lower pH, suggesting an increased reliance on the chemiosmotic gradient to impede proton influx. Lipid analysis revealed increased core lipid saturation, midchain methylation, and a shift in priming precursors from leucine to valine at low pH, indicating reduced membrane permeability and more energy-efficient biosynthetic pathways. Together, these adaptations likely reduce proton entry, explaining how aSRB adapt to AMD-like acidity and unlock the pH bottleneck for AMD bioremediation and metal recovery.

Global warming boosts freshwater methane production. Now, a study shows that methane oxidizing bacteria cannot increase their methane consumption rates enough in response to warming-induced enhancemen...

Various C₁–C₂ compounds are increasingly available through electrochemical reduction of CO2. Although not always suitable as a sole substrate, these compounds can supplement a primary substrate like ....

The world is facing a climate crisis intensified by human-driven nutrient pollution. Ammonia and the bacteria that oxidize it are central both to the global nitrogen cycle and to wastewater treatment....

Research by microbiologists Reinier Egas and Cornelia Welte of Radboud University shows that many methane-consuming microorganisms actually prefer carbon monoxide over methane. When carbon monoxide is...

Anaerobic methane-oxidizing archaea mitigate methane emissions in anoxic environments. Here, Egas et al. show that these microbes can also oxidize carbon monoxide, prompting re-evaluation of their cla...

OPINIE - De nieuwe strategie van de Radboud Universiteit ontvouwt zich als een gedurfde visie die de traditionele bescheidenheid van zich afschudt, schrijft hoogleraar microbiologie Mike Jetten. Maar ...

The newly described microbe represents a world of parasitic, intercellular biodiversity only beginning to be revealed by genome sequencing.

Research by microbiologists Martijn Wissink and Cornelia Welte of Radboud University, among others, is helping us understand how microorganisms regulate the methane balance .