ArticleThe ISME journal2025
Magnetotactic bacteria affiliated with diverse Pseudomonadota families biomineralize intracellular Ca-carbonate.
Article in The ISME journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Magnetoreception in a freshwater ciliate arises from endosymbiosis.Nature communications · 2026Article
- GdbMTB: a manually curated genomic database of magnetotactic bacteria.Database : the journal of biological databases and curation · 2026Article
- MagnetotacticISME communications · 2026Article
- Metagenomics reveals the functional profiles of soil microorganisms and nutrient cycling under long-term grass vegetation cropping.Current research in microbial sciences · 2026Article
- The Role of Confinement in Biomineralization.Chemical reviews · 2025Review
- Deep-branching magnetotactic bacteria form intracellular carbonates enriched in trace metals.mSystems · 2025Article
- Revealing the diversity of bacterial and archaeal organelles via comparative genomics.Molecular biology of the cell · 2025Review
- Giant multicellular magnetotactic prokaryotes in marine sediments.The ISME journal · 2025Article
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Authors and funding
22 authors.
Funding
Abstract
Intracellular calcium carbonate formation has long been associated with a single genus of giant Gammaproteobacteria, Achromatium. However, this biomineralization has recently received increasing attention after being observed in photosynthetic Cyanobacteriota and in two families of magnetotactic bacteria affiliated with the Alphaproteobacteria. In the latter group, bacteria form not only intracellular amorphous calcium carbonates into large inclusions that are refringent under the light microscope, but also intracellular ferrimagnetic crystals into organelles called magnetosomes. Here new observations suggest that magnetotactic bacteria previously identified in the sediments and water column of Lake Pavin (France) were only a small fraction of the diversity of bacteria producing intracellular amorphous calcium carbonates. To explore this diversity further, we conducted a comprehensive investigation of magnetotactic populations with refractive granules using a combination of environmental microbiology, genomic and mineralogy approaches on cells sorted by micromanipulation. Several species belonging to divergent genera of two Pseudomonadota classes were identified and characterized. Scanning transmission electron microscopy coupled with energy-dispersive X-ray spectrometry support that all these species indeed form intracellular amorphous calcium carbonates. Cryo soft X-ray tomography experiments conducted on ice-vitrified cells, enabled 3D investigation of inclusions volume, which was found to occupy 44-68% of the cell volume. Metabolic network modeling highlighted different metabolic abilities of Alpha- and Gammaproteobacteria, including methylotrophy and CO2 fixation via the reverse Krebs cycle or the Calvin-Benson-Bassham cycle. Overall, this study strengthens a convergent evolution scenario for intracellular carbonatogenesis in Bacteria, and further supports that it is promoted by the fixation of CO2 in anoxic environments.
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