Effect of large magnetotactic bacteria with polyphosphate inclusions on the phosphate profile of the suboxic zone in the Black Sea.
Journal
The ISME journal
ISSN: 1751-7370
Titre abrégé: ISME J
Pays: England
ID NLM: 101301086
Informations de publication
Date de publication:
05 2019
05 2019
Historique:
received:
04
07
2018
accepted:
13
11
2018
revised:
11
10
2018
pubmed:
16
1
2019
medline:
28
10
2019
entrez:
16
1
2019
Statut:
ppublish
Résumé
The Black Sea is the world's largest anoxic basin and a model system for studying processes across redox gradients. In between the oxic surface and the deeper sulfidic waters there is an unusually broad layer of 10-40 m, where neither oxygen nor sulfide are detectable. In this suboxic zone, dissolved phosphate profiles display a pronounced minimum at the upper and a maximum at the lower boundary, with a peak of particulate phosphorus in between, which was suggested to be caused by the sorption of phosphate on sinking particles of metal oxides. Here we show that bacterial polyphosphate inclusions within large magnetotactic bacteria related to the genus Magnetococcus contribute substantially to the observed phosphorus peak, as they contain 26-34% phosphorus compared to only 1-5% in metal-rich particles. Furthermore, we found increased gene expression for polyphosphate kinases by several groups of bacteria including Magnetococcaceae at the phosphate maximum, indicating active bacterial polyphosphate degradation. We propose that large magnetotactic bacteria shuttle up and down within the suboxic zone, scavenging phosphate at the upper and releasing it at the lower boundary. In contrast to a passive transport via metal oxides, this bacterial transport can quantitatively explain the observed phosphate profiles.
Identifiants
pubmed: 30643197
doi: 10.1038/s41396-018-0315-6
pii: 10.1038/s41396-018-0315-6
pmc: PMC6474215
doi:
Substances chimiques
Phosphates
0
Polyphosphates
0
Phosphorus
27YLU75U4W
Phosphotransferases (Phosphate Group Acceptor)
EC 2.7.4.-
polyphosphate kinase
EC 2.7.4.1
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1198-1208Subventions
Organisme : Deutsche Forschungsgemeinschaft (German Research Foundation)
ID : MSM33
Pays : International
Organisme : Bundesministerium für Bildung und Forschung (Federal Ministry of Education and Research)
ID : 01DK12043
Pays : International
Organisme : Bundesministerium für Bildung und Forschung (Federal Ministry of Education and Research)
ID : 03F0663A
Pays : International
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