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Transporter characterisation reveals aminoethylphosphonate mineralisation as a key step in the marine phosphorus redox cycle

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Murphy, Andrew, Scanlan, David J. , Chen, Yin, Adams, Nathan B. P., Cadman, William A., Bottrill, Andrew R., Bending, G. D., Hammond, John P., Hitchcock, Andrew, Wellington, Elizabeth M. H. and Lidbury, Ian D. E. A. (2021) Transporter characterisation reveals aminoethylphosphonate mineralisation as a key step in the marine phosphorus redox cycle. Nature Communications, 12 (1). 4554. doi:10.1038/s41467-021-24646-z ISSN 2041-1723.

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Official URL: http://dx.doi.org/10.1038/s41467-021-24646-z

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Abstract

The planktonic synthesis of reduced organophosphorus molecules, such as alkylphosphonates and aminophosphonates, represents one half of a vast global oceanic phosphorus redox cycle. Whilst alkylphosphonates tend to accumulate in recalcitrant dissolved organic matter, aminophosphonates do not. Here, we identify three bacterial 2-aminoethylphosphonate (2AEP) transporters, named AepXVW, AepP and AepSTU, whose synthesis is independent of phosphate concentrations (phosphate-insensitive). AepXVW is found in diverse marine heterotrophs and is ubiquitously distributed in mesopelagic and epipelagic waters. Unlike the archetypal phosphonate binding protein, PhnD, AepX has high affinity and high specificity for 2AEP (Stappia stellulata AepX Kd 23 ± 4 nM; methylphosphonate Kd 3.4 ± 0.3 mM). In the global ocean, aepX is heavily transcribed (~100-fold>phnD) independently of phosphate and nitrogen concentrations. Collectively, our data identifies a mechanism responsible for a major oxidation process in the marine phosphorus redox cycle and suggests 2AEP may be an important source of regenerated phosphate and ammonium, which are required for oceanic primary production.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history
Q Science > QR Microbiology
Divisions: Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Organophosphorus compounds , Organophosphorus compounds -- Synthesis, Phosphonates -- Absorption and adsorption, Marine bacteria, Phosphorus cycle (Biogeochemistry)
Journal or Publication Title: Nature Communications
Publisher: Nature Publishing Group
ISSN: 2041-1723
Official Date: 27 July 2021
Dates:
DateEvent
27 July 2021Published
29 June 2021Accepted
Volume: 12
Number: 1
Article Number: 4554
DOI: 10.1038/s41467-021-24646-z
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 3 August 2021
Date of first compliant Open Access: 4 August 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
BB/L026074/1[BBSRC] Biotechnology and Biological Sciences Research Councilhttp://dx.doi.org/10.13039/501100000268
BB/T009152/1[BBSRC] Biotechnology and Biological Sciences Research Councilhttp://dx.doi.org/10.13039/501100000268
NE/S013539/1 [NERC] Natural Environment Research Councilhttp://dx.doi.org/10.13039/501100000270
Is Part Of: 1

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