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Dominant oceanic bacteria secure phosphate using a large extracellular buffer
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Zubkov, Mikhail V. , Martin, Adrian P., Hartmann, Manuela, Grob, Carolina and Scanlan, David J. (2015) Dominant oceanic bacteria secure phosphate using a large extracellular buffer. Nature Communications, 6 . 7878. doi:10.1038/ncomms8878 ISSN 2041-1723.
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Official URL: http://dx.doi.org/10.1038/ncomms8878
Abstract
The ubiquitous SAR11 and Prochlorococcus bacteria manage to maintain a sufficient supply of phosphate in phosphate-poor surface waters of the North Atlantic subtropical gyre. Furthermore, it seems that their phosphate uptake may counter-intuitively be lower in more productive tropical waters, as if their cellular demand for phosphate decreases there. By flow sorting 33P-phosphate-pulsed 32P-phosphate-chased cells, we demonstrate that both Prochlorococcus and SAR11 cells exploit an extracellular buffer of labile phosphate up to 5–40 times larger than the amount of phosphate required to replicate their chromosomes. Mathematical modelling is shown to support this conclusion. The fuller the buffer the slower the cellular uptake of phosphate, to the point that in phosphate-replete tropical waters, cells can saturate their buffer and their phosphate uptake becomes marginal. Hence, buffer stocking is a generic, growth-securing adaptation for SAR11 and Prochlorococcus bacteria, which lack internal reserves to reduce their dependency on bioavailable ambient phosphate.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QD Chemistry Q Science > QH Natural history Q Science > QR Microbiology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||||
Library of Congress Subject Headings (LCSH): | Biogeochemistry, Phosphates, Marine bacteria, Oceanography -- Research -- North Atlantic Ocean | ||||||||||
Journal or Publication Title: | Nature Communications | ||||||||||
Publisher: | Nature Publishing Group | ||||||||||
ISSN: | 2041-1723 | ||||||||||
Official Date: | 22 July 2015 | ||||||||||
Dates: |
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Volume: | 6 | ||||||||||
Article Number: | 7878 | ||||||||||
DOI: | 10.1038/ncomms8878 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||
Date of first compliant deposit: | 30 December 2015 | ||||||||||
Date of first compliant Open Access: | 18 May 2016 | ||||||||||
Funder: | Natural Environment Research Council (Great Britain) (NERC) | ||||||||||
Grant number: | NE/H005196/1 | ||||||||||
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