Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemical Oceanography at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 2022. Marine diatoms are abundant photoautotrophic algae that contribute significantly to...
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Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
2022
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/28624 2023-05-15T18:25:17+02:00 Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms Kellogg, Riss Saito, Mak A. 2022-05 https://hdl.handle.net/1912/28624 en_US eng Massachusetts Institute of Technology and Woods Hole Oceanographic Institution WHOI Theses https://hdl.handle.net/1912/28624 doi:10.1575/1912/28624 doi:10.1575/1912/28624 Zinc Diatoms Proteomic Thesis 2022 ftwhoas https://doi.org/10.1575/1912/28624 2022-10-22T22:57:13Z Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemical Oceanography at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 2022. Marine diatoms are abundant photoautotrophic algae that contribute significantly to photosynthetic carbon fixation and export throughout the oceans. Zinc is an important micronutrient in algal metabolism, with scarce dissolved concentrations in the upper euphotic zone reflecting high biological demand. In this thesis, I investigated the response of marine diatoms to Zn scarcity to characterize metabolic mechanisms used to combat Zn stress. I began by assaying the ability to metabolically substitute cobalt (Co) in place of Zn in four diatom species and found that enhanced abilities to use Co are likely an adaptation to high surface dCo:dZn ratios in the native environment. I next demonstrated that Zn/Co metabolic substitution in diatoms is not universal using culture studies of Chaetoceros neogracile RS19, which has an absolute Zn requirement. Using global proteomic analysis, I then identified and characterized diatom ZCRP-A and ZCRP-B, a putative Zn-chaperone and membrane-tethered Zn acquisition protein, respectively, as two proteins involved in the low-Zn response. I demonstrated that these proteins are widespread in marine phytoplankton and can be deployed as protein biomarkers of Zn stress in the field. I furthermore documented both the detection of ZCRPs in the Southern Ocean and the existence of Zn/Fe co-limitation within the natural phytoplankton population in Terra Nova Bay, demonstrating that Zn co-limitation can indeed occur in the field, even in high macronutrient waters. Lastly, I explored the relative demand of Zn and cadmium (Cd) within the Southern Ocean community using stable 67Zn and 110Cd tracers, documenting a high demand for both metals during the austral 2017-2018 summer season and investigating the cycling of these elements within this important region. Overall, this ... Thesis Southern Ocean Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Austral Southern Ocean Terra Nova Bay |
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Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
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English |
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Zinc Diatoms Proteomic |
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Zinc Diatoms Proteomic Kellogg, Riss Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms |
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Zinc Diatoms Proteomic |
description |
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Chemical Oceanography at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution May 2022. Marine diatoms are abundant photoautotrophic algae that contribute significantly to photosynthetic carbon fixation and export throughout the oceans. Zinc is an important micronutrient in algal metabolism, with scarce dissolved concentrations in the upper euphotic zone reflecting high biological demand. In this thesis, I investigated the response of marine diatoms to Zn scarcity to characterize metabolic mechanisms used to combat Zn stress. I began by assaying the ability to metabolically substitute cobalt (Co) in place of Zn in four diatom species and found that enhanced abilities to use Co are likely an adaptation to high surface dCo:dZn ratios in the native environment. I next demonstrated that Zn/Co metabolic substitution in diatoms is not universal using culture studies of Chaetoceros neogracile RS19, which has an absolute Zn requirement. Using global proteomic analysis, I then identified and characterized diatom ZCRP-A and ZCRP-B, a putative Zn-chaperone and membrane-tethered Zn acquisition protein, respectively, as two proteins involved in the low-Zn response. I demonstrated that these proteins are widespread in marine phytoplankton and can be deployed as protein biomarkers of Zn stress in the field. I furthermore documented both the detection of ZCRPs in the Southern Ocean and the existence of Zn/Fe co-limitation within the natural phytoplankton population in Terra Nova Bay, demonstrating that Zn co-limitation can indeed occur in the field, even in high macronutrient waters. Lastly, I explored the relative demand of Zn and cadmium (Cd) within the Southern Ocean community using stable 67Zn and 110Cd tracers, documenting a high demand for both metals during the austral 2017-2018 summer season and investigating the cycling of these elements within this important region. Overall, this ... |
author2 |
Saito, Mak A. |
format |
Thesis |
author |
Kellogg, Riss |
author_facet |
Kellogg, Riss |
author_sort |
Kellogg, Riss |
title |
Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms |
title_short |
Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms |
title_full |
Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms |
title_fullStr |
Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms |
title_full_unstemmed |
Assessing the potential for Zn limitation of marine primary production: proteomic characterization of the low Zn stress response in marine diatoms |
title_sort |
assessing the potential for zn limitation of marine primary production: proteomic characterization of the low zn stress response in marine diatoms |
publisher |
Massachusetts Institute of Technology and Woods Hole Oceanographic Institution |
publishDate |
2022 |
url |
https://hdl.handle.net/1912/28624 |
geographic |
Austral Southern Ocean Terra Nova Bay |
geographic_facet |
Austral Southern Ocean Terra Nova Bay |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
doi:10.1575/1912/28624 |
op_relation |
WHOI Theses https://hdl.handle.net/1912/28624 doi:10.1575/1912/28624 |
op_doi |
https://doi.org/10.1575/1912/28624 |
_version_ |
1766206600892121088 |