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Hydroxamate siderophores: occurrence and importance in the Atlantic Ocean

Hydroxamate siderophores: occurrence and importance in the Atlantic Ocean
Hydroxamate siderophores: occurrence and importance in the Atlantic Ocean
Siderophores are chelates produced by bacteria as part of a highly specific iron uptake mechanism. They are thought to be important in the bacterial acquisition of iron in seawater and to influence iron biogeochemistry in the ocean. We have identified and quantified two types of siderophores in seawater samples collected from the Atlantic Ocean. These siderophores were identified as hydroxamate siderophores, both ferrioxamine species representative of the more soluble marine siderophores characterized to date. Ferrioxamine G was widely distributed in surface waters throughout the Atlantic Ocean, while ferrioxamine E had a more varied distribution. Total concentrations of the two siderophores were between 3 and 20 pM in the euphotic zone. If these compounds are fully complexed in seawater, they represent approximately 0.2?4.6% of the <0.2 ?m iron pool. Our data confirm that siderophore-mediated iron acquisition is important for marine heterotrophic bacteria and indicate that siderophores play an important role in the oceanic biogeochemical cycling of iron.
0013-936X
8675-8680
Mawji, Edward
36970997-a479-4cc5-8120-82a2fe000202
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Milton, James A.
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Tarran, Glen A.
218a9233-a6ae-4d0c-a9ca-35ad0d5a35f7
Ussher, Simon
32006952-df4b-4364-8aae-7b9be1f39745
Thompson, Anu
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Wolff, George A.
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Worsfold, Paul J.
27675f89-7eee-45c5-821e-a381d8db9693
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9
Mawji, Edward
36970997-a479-4cc5-8120-82a2fe000202
Gledhill, Martha
da795c1e-1489-4d40-9df1-fc6bde54382d
Milton, James A.
9e183221-d0d4-4ddb-aeba-0fdde9d31230
Tarran, Glen A.
218a9233-a6ae-4d0c-a9ca-35ad0d5a35f7
Ussher, Simon
32006952-df4b-4364-8aae-7b9be1f39745
Thompson, Anu
e1d5ef95-996b-45f0-9208-68a7f5fe4a21
Wolff, George A.
6b29d886-06f9-4405-8fab-33cfb436acaa
Worsfold, Paul J.
27675f89-7eee-45c5-821e-a381d8db9693
Achterberg, Eric P.
685ce961-8c45-4503-9f03-50f6561202b9

Mawji, Edward, Gledhill, Martha, Milton, James A., Tarran, Glen A., Ussher, Simon, Thompson, Anu, Wolff, George A., Worsfold, Paul J. and Achterberg, Eric P. (2008) Hydroxamate siderophores: occurrence and importance in the Atlantic Ocean. Environmental Science & Technology, 42 (3), 8675-8680. (doi:10.1021/es801884r).

Record type: Article

Abstract

Siderophores are chelates produced by bacteria as part of a highly specific iron uptake mechanism. They are thought to be important in the bacterial acquisition of iron in seawater and to influence iron biogeochemistry in the ocean. We have identified and quantified two types of siderophores in seawater samples collected from the Atlantic Ocean. These siderophores were identified as hydroxamate siderophores, both ferrioxamine species representative of the more soluble marine siderophores characterized to date. Ferrioxamine G was widely distributed in surface waters throughout the Atlantic Ocean, while ferrioxamine E had a more varied distribution. Total concentrations of the two siderophores were between 3 and 20 pM in the euphotic zone. If these compounds are fully complexed in seawater, they represent approximately 0.2?4.6% of the <0.2 ?m iron pool. Our data confirm that siderophore-mediated iron acquisition is important for marine heterotrophic bacteria and indicate that siderophores play an important role in the oceanic biogeochemical cycling of iron.

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e-pub ahead of print date: 31 October 2008
Published date: 1 December 2008
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 63879
URI: http://eprints.soton.ac.uk/id/eprint/63879
ISSN: 0013-936X
PURE UUID: 48f5d333-4ac4-4627-9ba2-f9ca04365771
ORCID for James A. Milton: ORCID iD orcid.org/0000-0003-4245-5532

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Date deposited: 13 Nov 2008
Last modified: 28 Oct 2023 01:40

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Contributors

Author: Edward Mawji
Author: Martha Gledhill
Author: James A. Milton ORCID iD
Author: Glen A. Tarran
Author: Simon Ussher
Author: Anu Thompson
Author: George A. Wolff
Author: Paul J. Worsfold

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