Shedding light on cobalamin photodegradation in the ocean

Bannon, Catherine C.; Mudge, Elizabeth M.; Bertrand, Erin M.

doi:10.1002/lol2.10371

Cited by 5 publications

References 60 publications

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Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B12

Hallberg,

Nicolas,

Alvarez-Aponte

et al. 2024

The ISME Journal

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Soil microbial communities perform critical ecosystem services through the collective metabolic activities of numerous individual organisms. Most microbes use corrinoids, a structurally diverse family of cofactors related to vitamin B12. Corrinoid structure influences the growth of individual microbes, yet how these growth responses scale to the community level remains unknown. Analysis of metagenome-assembled genomes suggests corrinoids are supplied to the community by members of the archaeal and bacterial phyla Thermoproteota, Actinobacteria, and Proteobacteria. Corrinoids were found largely adhered to the soil matrix in a grassland soil, at levels exceeding those required by cultured bacteria. Enrichment cultures and soil microcosms seeded with different corrinoids showed distinct shifts in bacterial community composition, supporting the hypothesis that corrinoid structure can shape communities. Environmental context influenced both community and taxon-specific responses to specific corrinoids. These results implicate corrinoids as key determinants of soil microbiome structure and suggest that environmental micronutrient reservoirs promote community stability.

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Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B12

Hallberg,

Nicolas,

Alvarez-Aponte

et al. 2024

The ISME Journal

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Vitamin auxotrophies shape microbial community assembly in the ocean

Gregor,

Vercelli,

Szabo

et al. 2023

Preprint

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Microbial community assembly is governed by complex interaction networks based on the secretion and exchange of metabolites. While the importance of trophic interactions (e.g. cross-feeding of metabolic byproducts) in structuring microbial communities is well-established, the roles of myriad natural products such as vitamins, siderophores, and antibiotics remain unclear. Here, we focus on the role of B vitamins in coastal marine bacterial communities that degrade particulate organic matter. We find that natural seawater particle-associated communities are vitamin limited and almost a third of bacterial isolates from these communities are B vitamin auxotrophs. Auxotroph growth rates are limited under even maximal environmental vitamin concentrations, indicating that auxotrophs likely survive through cross-feeding with community members. We find that polysaccharide-degrading bacteria tend to be vitamin prototrophs, suggesting that the initial arrival of degraders to a particle may promote a succession to auxotrophic taxa partially through vitamin cross-feeding. However, auxotrophs with complementary vitamin requirements were generally not able to grow in co-culture, and auxotroph growth was only partially rescued by prototrophs. We conclude that while vitamin auxotrophies are important metabolic dependencies shaping community structure, vitamin cross-feeding may primarily take place through cell lysis.

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Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B₁₂

Hallberg,

Nicolas,

Alvarez-Aponte

et al. 2024

Preprint

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Soil microbial communities perform critical ecosystem services through the collective metabolic activities of numerous individual organisms. Most microbes use corrinoids, a structurally diverse family of cofactors related to vitamin B12. Corrinoid structure influences the growth of individual microbes, yet how these growth responses scale to the community level remains unknown. Analysis of metagenome-assembled genomes suggests corrinoids are supplied to the community by members of the archaeal and bacterial phyla Thermoproteota, Actinobacteria, and Proteobacteria. Corrinoids were found largely adhered to the soil matrix in a grassland soil, at levels exceeding those required by cultured bacteria. Enrichment cultures and soil microcosms seeded with different corrinoids show distinct shifts in bacterial 16S composition, supporting the hypothesis that corrinoid structure can shape communities. Environmental context influenced both community and taxon-specific responses to specific corrinoids. These results implicate corrinoids as key determinants of soil microbiome structure and suggest that environmental micronutrient reservoirs promote community stability.

show abstract

Shedding light on cobalamin photodegradation in the ocean

Cited by 5 publications

References 60 publications

Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B12

Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B12

Vitamin auxotrophies shape microbial community assembly in the ocean

Soil microbial community response to corrinoids is shaped by a natural reservoir of vitamin B₁₂

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