Reduction-dependent siderophore assimilation in a model pennate diatom
Abstract
Iron uptake by diatoms is a biochemical process with global biogeochemical implications. In large regions of the surface ocean diatoms are both responsible for the majority of primary production and frequently experiencing iron limitation of growth. The strategies used by these phytoplankton to extract iron from seawater constrain carbon flux into higher trophic levels and sequestration into sediments. In this study we use reverse genetic techniques to target putative iron-acquisition genes in the model pennate diatom Phaeodactylum tricornutum . We describe components of a reduction-dependent siderophore acquisition pathway that relies on a bacterial-derived receptor protein and provides a viable alternative to inorganic iron uptake under certain conditions. This form of iron uptake entails a close association between diatoms and siderophore-producing organisms during low-iron conditions. Homologs of these proteins are found distributed across diatom lineages, suggesting the significance of siderophore utilization by diatoms in the marine environment. Evaluation of specific proteins enables us to confirm independent iron-acquisition pathways in diatoms and characterize their preferred substrates. These findings refine our mechanistic understanding of the multiple iron-uptake systems used by diatoms and help us better predict the influence of iron speciation on taxa-specific iron bioavailability.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1573107
- Grant/Contract Number:
- SC0018344
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 47; Journal ID: ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Coale, Tyler H., Moosburner, Mark, Horák, Aleš, Oborník, Miroslav, Barbeau, Katherine A., and Allen, Andrew E. Reduction-dependent siderophore assimilation in a model pennate diatom. United States: N. p., 2019.
Web. doi:10.1073/pnas.1907234116.
Coale, Tyler H., Moosburner, Mark, Horák, Aleš, Oborník, Miroslav, Barbeau, Katherine A., & Allen, Andrew E. Reduction-dependent siderophore assimilation in a model pennate diatom. United States. doi:10.1073/pnas.1907234116.
Coale, Tyler H., Moosburner, Mark, Horák, Aleš, Oborník, Miroslav, Barbeau, Katherine A., and Allen, Andrew E. Mon .
"Reduction-dependent siderophore assimilation in a model pennate diatom". United States. doi:10.1073/pnas.1907234116.
@article{osti_1573107,
title = {Reduction-dependent siderophore assimilation in a model pennate diatom},
author = {Coale, Tyler H. and Moosburner, Mark and Horák, Aleš and Oborník, Miroslav and Barbeau, Katherine A. and Allen, Andrew E.},
abstractNote = {Iron uptake by diatoms is a biochemical process with global biogeochemical implications. In large regions of the surface ocean diatoms are both responsible for the majority of primary production and frequently experiencing iron limitation of growth. The strategies used by these phytoplankton to extract iron from seawater constrain carbon flux into higher trophic levels and sequestration into sediments. In this study we use reverse genetic techniques to target putative iron-acquisition genes in the model pennate diatom Phaeodactylum tricornutum . We describe components of a reduction-dependent siderophore acquisition pathway that relies on a bacterial-derived receptor protein and provides a viable alternative to inorganic iron uptake under certain conditions. This form of iron uptake entails a close association between diatoms and siderophore-producing organisms during low-iron conditions. Homologs of these proteins are found distributed across diatom lineages, suggesting the significance of siderophore utilization by diatoms in the marine environment. Evaluation of specific proteins enables us to confirm independent iron-acquisition pathways in diatoms and characterize their preferred substrates. These findings refine our mechanistic understanding of the multiple iron-uptake systems used by diatoms and help us better predict the influence of iron speciation on taxa-specific iron bioavailability.},
doi = {10.1073/pnas.1907234116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 47,
volume = 116,
place = {United States},
year = {2019},
month = {11}
}
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DOI: 10.1073/pnas.1907234116
DOI: 10.1073/pnas.1907234116
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