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Mosaic patterns of B‐vitamin synthesis and utilization in a natural marine microbial community.

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Title: Mosaic patterns of B‐vitamin synthesis and utilization in a natural marine microbial community.
Authors: Gómez‐Consarnau, Laura1,2 gomezcon@usc.edu, Sachdeva, Rohan1, Gifford, Scott M.3, Cutter, Lynda S.1, Fuhrman, Jed A.1, Sañudo‐Wilhelmy, Sergio A.1,4, Moran, Mary Ann5
Source: Environmental Microbiology. Aug2018, Vol. 20 Issue 8, p2809-2823. 15p.
Subjects: Marine microbiology, Microbial communities, Nutrient cycles, Auxotrophy, Gene expression, Vitamin B complex
Abstract: Summary: Aquatic environments contain large communities of microorganisms whose synergistic interactions mediate the cycling of major and trace nutrients, including vitamins. B‐vitamins are essential coenzymes that many organisms cannot synthesize. Thus, their exchange among de novo synthesizers and auxotrophs is expected to play an important role in the microbial consortia and explain some of the temporal and spatial changes observed in diversity. In this study, we analyzed metatranscriptomes of a natural marine microbial community, diel sampled quarterly over one year to try to identify the potential major B‐vitamin synthesizers and consumers. Transcriptomic data showed that the best‐represented taxa dominated the expression of synthesis genes for some B‐vitamins but lacked transcripts for others. For instance, Rhodobacterales dominated the expression of vitamin‐B12 synthesis, but not of vitamin‐B7, whose synthesis transcripts were mainly represented by Flavobacteria. In contrast, bacterial groups that constituted less than 4% of the community (e.g., Verrucomicrobia) accounted for most of the vitamin‐B1 synthesis transcripts. Furthermore, ambient vitamin‐B1 concentrations were higher in samples collected during the day, and were positively correlated with chlorophyll‐a concentrations. Our analysis supports the hypothesis that the mosaic of metabolic interdependencies through B‐vitamin synthesis and exchange are key processes that contribute to shaping microbial communities in nature. [ABSTRACT FROM AUTHOR]
Copyright of Environmental Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mosaic patterns of B‐vitamin synthesis and utilization in a natural marine microbial community.
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  Data: <searchLink fieldCode="JN" term="%22Environmental+Microbiology%22">Environmental Microbiology</searchLink>. Aug2018, Vol. 20 Issue 8, p2809-2823. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Marine+microbiology%22">Marine microbiology</searchLink><br /><searchLink fieldCode="DE" term="%22Microbial+communities%22">Microbial communities</searchLink><br /><searchLink fieldCode="DE" term="%22Nutrient+cycles%22">Nutrient cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Auxotrophy%22">Auxotrophy</searchLink><br /><searchLink fieldCode="DE" term="%22Gene+expression%22">Gene expression</searchLink><br /><searchLink fieldCode="DE" term="%22Vitamin+B+complex%22">Vitamin B complex</searchLink>
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  Data: Summary: Aquatic environments contain large communities of microorganisms whose synergistic interactions mediate the cycling of major and trace nutrients, including vitamins. B‐vitamins are essential coenzymes that many organisms cannot synthesize. Thus, their exchange among de novo synthesizers and auxotrophs is expected to play an important role in the microbial consortia and explain some of the temporal and spatial changes observed in diversity. In this study, we analyzed metatranscriptomes of a natural marine microbial community, diel sampled quarterly over one year to try to identify the potential major B‐vitamin synthesizers and consumers. Transcriptomic data showed that the best‐represented taxa dominated the expression of synthesis genes for some B‐vitamins but lacked transcripts for others. For instance, Rhodobacterales dominated the expression of vitamin‐B12 synthesis, but not of vitamin‐B7, whose synthesis transcripts were mainly represented by Flavobacteria. In contrast, bacterial groups that constituted less than 4% of the community (e.g., Verrucomicrobia) accounted for most of the vitamin‐B1 synthesis transcripts. Furthermore, ambient vitamin‐B1 concentrations were higher in samples collected during the day, and were positively correlated with chlorophyll‐a concentrations. Our analysis supports the hypothesis that the mosaic of metabolic interdependencies through B‐vitamin synthesis and exchange are key processes that contribute to shaping microbial communities in nature. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Environmental Microbiology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/1462-2920.14133
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      – SubjectFull: Nutrient cycles
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      – SubjectFull: Gene expression
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      – SubjectFull: Vitamin B complex
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              Text: Aug2018
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