Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton
Author Posting. © Association for the Sciences of Limnology and Oceanography, 2013. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 58...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6547 2023-05-15T13:53:14+02:00 Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton Bertrand, Erin M. Moran, Dawn M. McIlvin, Matthew R. Hoffman, Jeffrey M. Allen, Andrew E. Saito, Mak A. 2013-07 application/pdf https://hdl.handle.net/1912/6547 en_US eng Association for the Sciences of Limnology and Oceanography https://doi.org/10.4319/lo.2013.58.4.1431 Limnology and Oceanography 58 (2013): 1431–1450 https://hdl.handle.net/1912/6547 doi:10.4319/lo.2013.58.4.1431 Limnology and Oceanography 58 (2013): 1431–1450 doi:10.4319/lo.2013.58.4.1431 Article 2013 ftwhoas https://doi.org/10.4319/lo.2013.58.4.1431 2022-05-28T22:59:03Z Author Posting. © Association for the Sciences of Limnology and Oceanography, 2013. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 58 (2013): 1431–1450, doi:10.4319/lo.2013.58.4.1431. Three proteins related to vitamin B12 metabolism in diatoms were quantified via selected reaction monitoring mass spectrometry: B12-dependent and B12-independent methionine synthase (MetH, MetE) and a B12 acquisition protein (CBA1). B12-mediated interreplacement of MetE and MetH metalloenzymes was observed in Phaeodactylum tricornutum where MetH abundance was highest (0.06 fmol µg−1 protein) under high B12 and MetE abundance increased to 3.25 fmol µg−1 protein under low B12 availability. Maximal MetE abundance was 60-fold greater than MetH, consistent with the expected ∼ 50–100-fold larger turnover number for MetH. MetE expression resulted in 30-fold increase in nitrogen and 40-fold increase in zinc allocated to methionine synthase activity under low B12. CBA1 abundance was 6-fold higher under low-B12 conditions and increased upon B12 resupply to starved cultures. While biochemical pathways that supplant B12 requirements exist and are utilized by organisms such as land plants, B12 use persists in eukaryotic phytoplankton. This study suggests that retention of B12 utilization by phytoplankton results in resource conservation under conditions of high B12 availability. MetE and MetH abundances were also measured in diatom communities from McMurdo Sound, verifying that both these proteins are expressed in natural communities. These protein measurements are consistent with previous studies suggesting that B12 availability influences Antarctic primary productivity. This study illuminates controls on expression of B12-related proteins, quantitatively assesses the metabolic consequences of B12 deprivation, and demonstrates that mass spectrometry–based protein measurements ... Article in Journal/Newspaper Antarc* Antarctic McMurdo Sound Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic McMurdo Sound Limnology and Oceanography 58 4 1431 1450 |
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Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
description |
Author Posting. © Association for the Sciences of Limnology and Oceanography, 2013. This article is posted here by permission of Association for the Sciences of Limnology and Oceanography for personal use, not for redistribution. The definitive version was published in Limnology and Oceanography 58 (2013): 1431–1450, doi:10.4319/lo.2013.58.4.1431. Three proteins related to vitamin B12 metabolism in diatoms were quantified via selected reaction monitoring mass spectrometry: B12-dependent and B12-independent methionine synthase (MetH, MetE) and a B12 acquisition protein (CBA1). B12-mediated interreplacement of MetE and MetH metalloenzymes was observed in Phaeodactylum tricornutum where MetH abundance was highest (0.06 fmol µg−1 protein) under high B12 and MetE abundance increased to 3.25 fmol µg−1 protein under low B12 availability. Maximal MetE abundance was 60-fold greater than MetH, consistent with the expected ∼ 50–100-fold larger turnover number for MetH. MetE expression resulted in 30-fold increase in nitrogen and 40-fold increase in zinc allocated to methionine synthase activity under low B12. CBA1 abundance was 6-fold higher under low-B12 conditions and increased upon B12 resupply to starved cultures. While biochemical pathways that supplant B12 requirements exist and are utilized by organisms such as land plants, B12 use persists in eukaryotic phytoplankton. This study suggests that retention of B12 utilization by phytoplankton results in resource conservation under conditions of high B12 availability. MetE and MetH abundances were also measured in diatom communities from McMurdo Sound, verifying that both these proteins are expressed in natural communities. These protein measurements are consistent with previous studies suggesting that B12 availability influences Antarctic primary productivity. This study illuminates controls on expression of B12-related proteins, quantitatively assesses the metabolic consequences of B12 deprivation, and demonstrates that mass spectrometry–based protein measurements ... |
format |
Article in Journal/Newspaper |
author |
Bertrand, Erin M. Moran, Dawn M. McIlvin, Matthew R. Hoffman, Jeffrey M. Allen, Andrew E. Saito, Mak A. |
spellingShingle |
Bertrand, Erin M. Moran, Dawn M. McIlvin, Matthew R. Hoffman, Jeffrey M. Allen, Andrew E. Saito, Mak A. Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton |
author_facet |
Bertrand, Erin M. Moran, Dawn M. McIlvin, Matthew R. Hoffman, Jeffrey M. Allen, Andrew E. Saito, Mak A. |
author_sort |
Bertrand, Erin M. |
title |
Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton |
title_short |
Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton |
title_full |
Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton |
title_fullStr |
Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton |
title_full_unstemmed |
Methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of B12 use by eukaryotic phytoplankton |
title_sort |
methionine synthase interreplacement in diatom cultures and communities : implications for the persistence of b12 use by eukaryotic phytoplankton |
publisher |
Association for the Sciences of Limnology and Oceanography |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/6547 |
geographic |
Antarctic McMurdo Sound |
geographic_facet |
Antarctic McMurdo Sound |
genre |
Antarc* Antarctic McMurdo Sound |
genre_facet |
Antarc* Antarctic McMurdo Sound |
op_source |
Limnology and Oceanography 58 (2013): 1431–1450 doi:10.4319/lo.2013.58.4.1431 |
op_relation |
https://doi.org/10.4319/lo.2013.58.4.1431 Limnology and Oceanography 58 (2013): 1431–1450 https://hdl.handle.net/1912/6547 doi:10.4319/lo.2013.58.4.1431 |
op_doi |
https://doi.org/10.4319/lo.2013.58.4.1431 |
container_title |
Limnology and Oceanography |
container_volume |
58 |
container_issue |
4 |
container_start_page |
1431 |
op_container_end_page |
1450 |
_version_ |
1766258249758146560 |