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Trade-offs of lipid remodelling in a marine predator-prey interaction in response to phosphorus limitation
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Guillonneau, Richard, Murphy, Andrew, Teng, Zhao-Jie, Wang, Peng , Zhang, Yu-Zhong, Scanlan, David J. and Chen, Yin (2022) Trade-offs of lipid remodelling in a marine predator-prey interaction in response to phosphorus limitation. Proceedings of the National Academy of Sciences of the United States of America, 119 (36). e2203057119. doi:10.1073/pnas.2203057119 ISSN 0027-8424.
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Official URL: https://doi.org/10.1073/pnas.2203057119
Abstract
Phosphorus (P) is a key nutrient limiting bacterial growth and primary production in the oceans. Unsurprisingly, marine microbes have evolved sophisticated strategies to adapt to P limitation, one of which involves the remodeling of membrane lipids by replacing phospholipids with non-P-containing surrogate lipids. This strategy is adopted by both cosmopolitan marine phytoplankton and heterotrophic bacteria and serves to reduce the cellular P quota. However, little, if anything, is known of the biological consequences of lipid remodeling. Here, using the marine bacterium Phaeobacter sp. MED193 and the ciliate Uronema marinum as a model, we sought to assess the effect of remodeling on bacteria–protist interactions. We discovered an important trade-off between either escape from ingestion or resistance to digestion. Thus, Phaeobacter grown under P-replete conditions was readily ingested by Uronema, but not easily digested, supporting only limited predator growth. In contrast, following membrane lipid remodeling in response to P depletion, Phaeobacter was less likely to be captured by Uronema, thanks to the reduced expression of mannosylated glycoconjugates. However, once ingested, membrane-remodeled cells were unable to prevent phagosome acidification, became more susceptible to digestion, and, as such, allowed rapid growth of the ciliate predator. This trade-off between adapting to a P-limited environment and susceptibility to protist grazing suggests the more efficient removal of low-P prey that potentially has important implications for the functioning of the marine microbial food web in terms of trophic energy transfer and nutrient export efficiency.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QP Physiology 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): | Marine bacteria -- Physiology, Membrane lipids, Phosphorus | ||||||
| Journal or Publication Title: | Proceedings of the National Academy of Sciences of the United States of America | ||||||
| Publisher: | National Academy of Sciences | ||||||
| ISSN: | 0027-8424 | ||||||
| Official Date: | 29 August 2022 | ||||||
| Dates: |
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| Volume: | 119 | ||||||
| Number: | 36 | ||||||
| Article Number: | e2203057119 | ||||||
| DOI: | 10.1073/pnas.2203057119 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 28 July 2022 | ||||||
| Date of first compliant Open Access: | 1 March 2023 | ||||||
| RIOXX Funder/Project Grant: |
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