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Mijovilovich A, Cloetens P, Lanzirotti A, Newville M, Wellenreuther G, Kumari P, Katsaros C, Carrano CJ, Küpper H, Küpper FC. Synchrotron X-rays reveal the modes of Fe binding and trace metal storage in the brown algae Laminaria digitata and Ectocarpus siliculosus. Metallomics 2023; 15:mfad058. [PMID: 37740572 PMCID: PMC10588612 DOI: 10.1093/mtomcs/mfad058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 09/21/2023] [Indexed: 09/24/2023]
Abstract
Iron is accumulated symplastically in kelp in a non-ferritin core that seems to be a general feature of brown algae. Microprobe studies show that Fe binding depends on tissue type. The sea is generally an iron-poor environment and brown algae were recognized in recent years for having a unique, ferritin-free iron storage system. Kelp (Laminaria digitata) and the filamentous brown alga Ectocarpus siliculosus were investigated using X-ray microprobe imaging and nanoprobe X-ray fluorescence tomography to explore the localization of iron, arsenic, strontium, and zinc, and micro-X-ray absorption near-edge structure (μXANES) to study Fe binding. Fe distribution in frozen hydrated environmental samples of both algae shows higher accumulation in the cortex with symplastic subcellular localization. This should be seen in the context of recent ultrastructural insight by cryofixation-freeze substitution that found a new type of cisternae that may have a storage function but differs from the apoplastic Fe accumulation found by conventional chemical fixation. Zn distribution co-localizes with Fe in E. siliculosus, whereas it is chiefly located in the L. digitata medulla, which is similar to As and Sr. Both As and Sr are mostly found at the cell wall of both algae. XANES spectra indicate that Fe in L. digitata is stored in a mineral non-ferritin core, due to the lack of ferritin-encoding genes. We show that the L. digitata cortex contains mostly a ferritin-like mineral, while the meristoderm may include an additional component.
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Affiliation(s)
- Ana Mijovilovich
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics and Biochemistry, Branišovska 1160/31, 370 05 Česke Budějovice, Czech Republic
| | - Peter Cloetens
- ESRF—The European Synchrotron Radiation Facility, Beamline ID16A, 71, avenue des Martyrs CS 40220 38043 Grenoble Cedex 9, France
| | - Antonio Lanzirotti
- Argonne National Laboratory, The University of Chicago, Building 434A, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Matt Newville
- Argonne National Laboratory, The University of Chicago, Building 434A, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | | | - Puja Kumari
- School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen AB24 3UU, UK
| | - Christos Katsaros
- Department of Biology, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 84, Hellas, Greece
| | - Carl J Carrano
- Department of Chemistry and Biochemistry, San Diego State University, CA 92182-1030,USA
| | - Hendrik Küpper
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics and Biochemistry, Branišovska 1160/31, 370 05 Česke Budějovice, Czech Republic
- Department of Experimental Plant Biology, University of South Bohemia, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic
| | - Frithjof C Küpper
- School of Biological Sciences, University of Aberdeen, Cruickshank Building, St Machar Drive, Aberdeen AB24 3UU, UK
- Department of Chemistry and Biochemistry, San Diego State University, CA 92182-1030,USA
- Marine Biodiscovery Centre, Department of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, UK
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Mamun MAA, Hayashi S, Papry RI, Miki O, Rahman IMM, Mashio AS, Hasegawa H. Influence of Different Arsenic Species on the Bioavailability and Bioaccumulation of Arsenic by Sargassum horneri C. Agardh: Effects under Different Phosphate Conditions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:98246-98260. [PMID: 37606771 DOI: 10.1007/s11356-023-29371-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 08/12/2023] [Indexed: 08/23/2023]
Abstract
The growth response and incorporation of As into the Sargassum horneri was evaluated for up to 7 days using either arsenate (As(V)), arsenite (As(III)) or methylarsonate (MMAA(V) and DMAA(V)) at 0, 0.25, 0.5, 1, 2, and 4 μM with various phosphate (P) levels (0, 2.5, 5 and 10 μM). Except As(III), algal chlorophyll fluorescence was almost similar and insignificant, regardless of whether different concentrations of P or As(V) or MMAA(V) or DMAA(V) were provided (p > 0.05). As(III) at higher concentrations negatively affected algal growth rate, though concentrations of all As species had significant effects on growth rate (p < 0.01). Growth studies indicated that toxicity and sensitivity of As species to the algae followed the trend: As(III) > As(V) > MMAA(V) ~ DMAA(V). As bioaccumulation was varied significantly depending on the increasing concentrations of all As species and increasing P levels considerably affected As(V) uptake but no other As species uptake (p < 0.01). The algae accumulated As(V) and As(III) more efficiently than MMAA(V) and DMAA(V). At equal concentrations of As (4 μM) and P (0 μM), the alga was able to accumulate 638.2 ± 71.3, 404.1 ± 70.6, 176.7 ± 19.6, and 205.6 ± 33.2 nM g-1 dry weight of As from As(V), As(III), MMAA(V), and DMAA(V), respectively. The influence of low P levels with increased As(V) concentrations more steeply increased As uptake, but P on other As species did not display similar trends. The algae also showed passive modes for As adsorption of all As species. The maximum adsorption of As (63.7 ± 6.1 nM g-1 dry weight) was found due to 4 μM As(V) exposure, which was 2.5, 7.3, and 6.9 times higher than the adsorption amounts for the same concentration of As(III), MMAA(V), and DMAA(V) exposure, respectively. The bioavailability and accumulation behaviors of As were significantly influenced by P and As species, and this information is essential for As research on marine ecosystems.
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Affiliation(s)
- M Abdullah Al Mamun
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
- Department of Soil Science, Hajee Mohammad Danesh Science and Technology University, Dinajpur, 5200, Bangladesh.
| | - Shuhei Hayashi
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Rimana Islam Papry
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
- Department of Environmental Science, IUBAT- International University of Business Agriculture and Technology, Dhaka, 1230, Bangladesh
| | - Osamu Miki
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Ismail M M Rahman
- Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima, 960-1296, Japan
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
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Cruz-López R, Carrano CJ. Iron uptake, transport and storage in marine brown algae. Biometals 2023; 36:371-383. [PMID: 36930341 DOI: 10.1007/s10534-023-00489-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 01/10/2023] [Indexed: 03/18/2023]
Abstract
Iron is a vital although biologically inaccessible trace nutrient for nearly all forms of life but "free" iron can be deleterious to cells and thus iron uptake and storage must be carefully controlled. The marine environment is particularly iron poor making mechanisms for its uptake and storage even more imperative. In this brief review we explore the known and potential iron uptake and storage pathways for the biologically and economically important marine brown macroalgae (seaweeds/kelps).
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Affiliation(s)
- Ricardo Cruz-López
- Instituto de Investigaciones Oceanológicas (IIO), Universidad Autónoma de Baja California (UABC), Ensenada, Baja California, México.
| | - Carl J Carrano
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA, 92182-1030, USA
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Liu F, Gledhill M, Tan QG, Zhu K, Zhang Q, Salaün P, Tagliabue A, Zhang Y, Weiss D, Achterberg EP, Korchev Y. Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation. THE ISME JOURNAL 2022; 16:2329-2336. [PMID: 35798938 PMCID: PMC9478132 DOI: 10.1038/s41396-022-01280-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 06/15/2022] [Accepted: 06/22/2022] [Indexed: 11/15/2022]
Abstract
Surface ocean pH is declining due to anthropogenic atmospheric CO2 uptake with a global decline of ~0.3 possible by 2100. Extracellular pH influences a range of biological processes, including nutrient uptake, calcification and silicification. However, there are poor constraints on how pH levels in the extracellular microenvironment surrounding phytoplankton cells (the phycosphere) differ from bulk seawater. This adds uncertainty to biological impacts of environmental change. Furthermore, previous modelling work suggests that phycosphere pH of small cells is close to bulk seawater, and this has not been experimentally verified. Here we observe under 140 μmol photons·m−2·s−1 the phycosphere pH of Chlamydomonas concordia (5 µm diameter), Emiliania huxleyi (5 µm), Coscinodiscus radiatus (50 µm) and C. wailesii (100 µm) are 0.11 ± 0.07, 0.20 ± 0.09, 0.41 ± 0.04 and 0.15 ± 0.20 (mean ± SD) higher than bulk seawater (pH 8.00), respectively. Thickness of the pH boundary layer of C. wailesii increases from 18 ± 4 to 122 ± 17 µm when bulk seawater pH decreases from 8.00 to 7.78. Phycosphere pH is regulated by photosynthesis and extracellular enzymatic transformation of bicarbonate, as well as being influenced by light intensity and seawater pH and buffering capacity. The pH change alters Fe speciation in the phycosphere, and hence Fe availability to phytoplankton is likely better predicted by the phycosphere, rather than bulk seawater. Overall, the precise quantification of chemical conditions in the phycosphere is crucial for assessing the sensitivity of marine phytoplankton to ongoing ocean acidification and Fe limitation in surface oceans.
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Fe(III)-polyuronic acid photochemistry: radical chemistry in natural polysaccharide. Photochem Photobiol Sci 2021; 20:255-263. [DOI: 10.1007/s43630-021-00014-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 01/19/2021] [Indexed: 12/20/2022]
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Mamun MAA, Omori Y, Miki O, Rahman IMM, Mashio AS, Maki T, Hasegawa H. Comparative biotransformation and detoxification potential of arsenic by three macroalgae species in seawater: Evidence from laboratory culture studies. CHEMOSPHERE 2019; 228:117-127. [PMID: 31026632 DOI: 10.1016/j.chemosphere.2019.04.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 04/05/2019] [Accepted: 04/08/2019] [Indexed: 06/09/2023]
Abstract
Algae accumulate and metabolize arsenic (As) and facilitate cycling and speciation of As in seawater. The laboratory-controlled macroalgal cultures were exposed to different molar ratios of As(V) and phosphate (P) in seawater for evaluating the uptake and metabolism of As, as a function of As(V) detoxification through biotransformation. Chlorophyll fluorescence of algal species was not significantly affected by the culture conditions (p > 0.05). Addition of 10 μM P positively reduce As stress, but different As(V)/P ratios significantly affect the growth rate (p < 0.05). Algae readily accumulated As(V) after the inoculation, transformed intracellularly, and released gradually into the medium along the incubation period, depending on As(V)/P molar ratios. Reduction and methylation were the leading processes of As(V) metabolism by Pyropia yezoensis, whereas Sargassum patens showed only the reduction. Sargassum horneri reduced As(V) under low level (0.1 μM), but both reduction and methylation were observed under a high level (1 μM). At the end of incubation, 0.17, 0.15, 0.1 μM of reduced metabolite (As[III]) were recorded from 1 μM of As(V)/P containing cultures of Sargassum horneri, Sargassum patens, and Pyropia yezoensis, respectively. On the other hand, 0.024 and 0.28 μM of methylated metabolite (DMAA[V]) were detected under the same culture conditions from Sargassum horneri and Pyropia yezoensis, respectively. The results also indicated that P in medium inhibits the intracellular uptake of As(V) and subsequent extrusion of biotransformed metabolites into the medium. These findings can help to understand the metabolic diversity of macroalgae species on As biogeochemistry in the marine environment.
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Affiliation(s)
- M Abdullah Al Mamun
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan; Department of Soil Science, Hajee Mohammad Danesh Science and Technology University, Dinajpur, 5200, Bangladesh.
| | - Yoshiki Omori
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Osamu Miki
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Ismail M M Rahman
- Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima, 960-1296, Japan.
| | - Asami S Mashio
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Teruya Maki
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan
| | - Hiroshi Hasegawa
- Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
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Küpper FC, Miller EP, Andrews SJ, Hughes C, Carpenter LJ, Meyer-Klaucke W, Toyama C, Muramatsu Y, Feiters MC, Carrano CJ. Emission of volatile halogenated compounds, speciation and localization of bromine and iodine in the brown algal genome model Ectocarpus siliculosus. J Biol Inorg Chem 2018; 23:1119-1128. [PMID: 29523971 DOI: 10.1007/s00775-018-1539-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 01/28/2018] [Indexed: 11/25/2022]
Abstract
This study explores key features of bromine and iodine metabolism in the filamentous brown alga and genomics model Ectocarpus siliculosus. Both elements are accumulated in Ectocarpus, albeit at much lower concentration factors (2-3 orders of magnitude for iodine, and < 1 order of magnitude for bromine) than e.g. in the kelp Laminaria digitata. Iodide competitively reduces the accumulation of bromide. Both iodide and bromide are accumulated in the cell wall (apoplast) of Ectocarpus, with minor amounts of bromine also detectable in the cytosol. Ectocarpus emits a range of volatile halogenated compounds, the most prominent of which by far is methyl iodide. Interestingly, biosynthesis of this compound cannot be accounted for by vanadium haloperoxidase since the latter have not been found to catalyze direct halogenation of an unactivated methyl group or hydrocarbon so a methyl halide transferase-type production mechanism is proposed.
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Affiliation(s)
- Frithjof C Küpper
- Oceanlab, University of Aberdeen, Main Street, Newburgh, AB41 6AA, Scotland, UK.
- Dunstaffnage Marine Laboratory, Scottish Association for Marine Science, Oban, Argyll, PA37 1QA, Scotland, UK.
| | - Eric P Miller
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA, 92182-1030, USA
| | - Stephen J Andrews
- Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
| | - Claire Hughes
- Environment Department, University of York, York, YO10 5NG, UK
| | - Lucy J Carpenter
- Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, York, YO10 5DD, UK
| | - Wolfram Meyer-Klaucke
- Department of Chemistry - Inorganic Chemistry, Faculty of Science, University of Paderborn, Warburger Strasse 100, 33098, Paderborn, Germany
| | - Chiaki Toyama
- Geological Survey of Japan, The National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8567, Japan
| | - Yasuyuki Muramatsu
- Department of Chemistry, Faculty of Science, Gakushuin University, Toshima-Ku, Tokyo, 171-8588, Japan
| | - Martin C Feiters
- Department of Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Carl J Carrano
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA, 92182-1030, USA
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A Complex Mechanism Involving LysR and TetR/AcrR That Regulates Iron Scavenger Biosynthesis in Pseudomonas donghuensis HYS. J Bacteriol 2018; 200:JB.00087-18. [PMID: 29686142 DOI: 10.1128/jb.00087-18] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 04/18/2018] [Indexed: 11/20/2022] Open
Abstract
7-Hydroxytropolone (7-HT) is a symmetrical seven-membered heteroatomic ring with a carboxyl group and two hydroxyl groups and was recently reported to be an iron scavenger of Pseudomonas donghuensis HYS. Cluster 1 includes 12 genes related to the synthesis of 7-HT; among these genes, those for two regulators, Orf1 and Orf12, were predicted to regulate 7-HT biosynthesis and to be LysR-type transcriptional regulators (LTTRs) and TetR/AcrR family transcriptional regulators, respectively. Data from real-time quantitative PCR and β-galactosidase and classical siderophore assays indicated that the transcription levels of orf1 and orf12, as well as those of crucial genes orf6 to orf9, were repressed under high-iron conditions. The deletion of orf1 and orf12 led to an absence of 7-HT and a decrease in orf6-orf9 expression. Orf1 and Orf12 were essential for the production of 7-HT through orf6-orf9 These two regulators are regulated by the Gac/Rsm system; Orf1 facilitates the expression of Orf12, and Orf12 concomitantly stimulates the expression of orf6-orf9 to synthesize 7-HT. The overexpression of Orf12 decreased 7-HT yields, possibly through decreased orf6-orf9 expression. This work thus outlines a complex mechanism regulating the biosynthesis of the iron scavenger 7-HT in P. donghuensis HYS. The synergy between Orf1 and Orf12 ensures that 7-HT acts as an iron chelator despite being toxic to bacteria and provides new ideas for the novel regulation of dual-functional secondary metabolism and research on 7-HT and its derivates in other bacteria.IMPORTANCE A complex regulation mechanism including two regulators, LysR and TetR/AcrR, in the biosynthesis of the novel iron scavenger 7-hydroxytropolone (7-HT) was verified in Pseudomonas donghuensis HYS. The coaction of LysR Orf1 and TetR/AcrR Orf12 may balance the toxicity and iron chelation of 7-HT in P. donghuensis HYS to overcome iron deficiency, as well as improve the bacterial competitiveness under iron-scarce conditions because of the toxicity of 7-HT toward other bacteria, making the accurate regulation of 7-HT biosynthesis indispensable. This regulation mechanism may be ubiquitous in the Pseudomonas putida group but may better explain the group's strong adaptability.
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Yarimizu K, Cruz-López R, Auerbach H, Heimann L, Schünemann V, Carrano CJ. Iron uptake and storage in the HAB dinoflagellate Lingulodinium polyedrum. Biometals 2017; 30:945-953. [PMID: 29067573 DOI: 10.1007/s10534-017-0061-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 10/17/2017] [Indexed: 10/18/2022]
Abstract
The iron uptake and storage systems of terrestrial/higher plants are now reasonably well understood with two basic strategies being distinguished: Strategy I involves the induction of an Fe(III)-chelate reductase (ferrireductase) along with Fe(II) or Fe(III) transporter proteins while strategy II plants have evolved sophisticated systems based on high-affinity, iron specific, binding compounds called phytosiderophores. In contrast, there is little knowledge about the corresponding systems in marine, plant-like lineages. Herein we report a study of the iron uptake and storage mechanisms in the harmful algal bloom dinoflagellate Lingulodinium polyedrum. L. polyedrum is an armored dinoflagellate with a mixotrophic lifestyle and one of the most common bloom species on Southern California coast widely noted for its bioluminescent properties and as a producer of yessotoxins. Short term radio-iron uptake studies indicate that iron is taken up by L. polyedrum in a time dependent manner consistent with an active transport process. Based on inhibitor and other studies it appears that a reductive-oxidative pathway such as that found in yeast and the green alga Chlamydomonas reinhardtii is likely. Of the various iron sources tested vibrioferrin, a photoactive and relatively weak siderophore produced by potentially mutualistic Marinobacter bacterial species, was the most efficient. Other more stable and non-photoactive siderophores such as ferrioxamine E were ineffective. Several pieces of data including long term exposure to 57Fe using Mössbauer spectroscopy suggest that L. polyedrum does not possess an iron storage system but rather presumably relies on an efficient iron uptake system, perhaps mediated by mutualistic interactions with bacteria.
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Affiliation(s)
- Kyoko Yarimizu
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA, 92182-1030, USA
| | - Ricardo Cruz-López
- Department of Biological Oceanography, Centro de Investigación Científica y de Educación Superior deEnsenada, Ensenada, BC, Mexico
| | - Hendrik Auerbach
- Department of Physics, University of Kaiserslautern, 67663, Kaiserslautern, Germany
| | - Larissa Heimann
- Department of Physics, University of Kaiserslautern, 67663, Kaiserslautern, Germany
| | - Volker Schünemann
- Department of Physics, University of Kaiserslautern, 67663, Kaiserslautern, Germany
| | - Carl J Carrano
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA, 92182-1030, USA.
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Auerbach H, Giammanco GE, Schünemann V, Ostrowski AD, Carrano CJ. Mössbauer Spectroscopic Characterization of Iron(III)–Polysaccharide Coordination Complexes: Photochemistry, Biological, and Photoresponsive Materials Implications. Inorg Chem 2017; 56:11524-11531. [DOI: 10.1021/acs.inorgchem.7b00686] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hendrik Auerbach
- Department of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Giuseppe E. Giammanco
- Department of Chemistry, Bowling Green State University, Bowling
Green, Ohio 43403 United States
| | - Volker Schünemann
- Department of Physics, University of Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Alexis D. Ostrowski
- Department of Chemistry, Bowling Green State University, Bowling
Green, Ohio 43403 United States
| | - Carl J. Carrano
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, United States
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11
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Miller EP, Auerbach H, Schünemann V, Tymon T, Carrano CJ. Surface binding, localization and storage of iron in the giant kelp Macrocystis pyrifera. Metallomics 2016; 8:403-11. [PMID: 27009567 DOI: 10.1039/c6mt00027d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Iron is an essential element for all living organisms due to its ubiquitous role in redox and other enzymes, especially in the context of respiration and photosynthesis. Although the iron uptake and storage mechanisms of terrestrial/higher plants have been well-studied, the corresponding systems in marine algae have received far less attention. While the iron many marine algae take up from the environment, irrespective of its detailed internalization mechanism, arrives at the cell surface by diffusion, there is growing evidence for more "active" means of concentrating this element prior to uptake. It has been well established in both laboratory and environmentally derived samples, that a large amount of iron can be "non-specifically" adsorbed to the surface of marine algae. While this phenomenon is widely recognized and has prompted the development of experimental protocols to eliminate its contribution to iron uptake studies, its potential biological significance as a concentrated iron storage source for marine algae is only now being recognized. In this study, using an interdisciplinary array of techniques, we show that the giant kelp Macrocystis pyrifera also displays significant cell surface bound iron although less than that seen with the related brown alga Ectocarpus siliculosus. The iron on the surface is likely bound to carboxylate groups and once inside the iron is found to localize differently depending on cell type. Iron appears to be stored in an as yet undefined mineral phase.
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Affiliation(s)
- Eric P Miller
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030, USA.
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12
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Li ZK, Dai GZ, Juneau P, Qiu BS. Capsular polysaccharides facilitate enhanced iron acquisition by the colonial cyanobacterium Microcystis sp. isolated from a freshwater lake. JOURNAL OF PHYCOLOGY 2016; 52:105-115. [PMID: 26987092 DOI: 10.1111/jpy.12372] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 10/29/2015] [Indexed: 06/05/2023]
Abstract
Microcystis sp., especially in its colonial form, is a common dominant species during cyanobacterial blooms in many iron-deficient water bodies. It is still not entirely clear, however, how the colonial forms of Microcystis acclimate to iron-deficient habitats, and the responses of unicellular and colonial forms to iron-replete and iron-deficient conditions were examined here. Growth rates and levels of photosynthetic pigments declined to a greater extent in cultures of unicellular Microcystis than in cultures of the colonial form in response to decreasing iron concentrations, resulting in the impaired photosynthetic performance of unicellular Microcystis as compared to colonial forms as measured by variable fluorescence and photosynthetic oxygen evolution. These results indicate that the light-harvesting ability and photosynthetic capacity of colonial Microcystis was less affected by iron deficiency than the unicellular form. The carotenoid contents and nonphotochemical quenching of colonial Microcystis were less reduced than those of the unicellular form under decreasing iron concentrations, indicating that the colonial morphology enhanced photoprotection and acclimation to iron-deficient conditions. Furthermore, large amounts of iron were detected in the capsular polysaccharides (CPS) of the colonies, and more iron was found to be attached to the colonial Microcystis CPS under decreasing iron conditions as compared to unicellular cultures. These results demonstrated that colonial Microcystis can acclimate to iron deficiencies better than the unicellular form, and that CPS plays an important role in their acclimation advantage in iron-deficient waters.
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Affiliation(s)
- Zheng-Ke Li
- School of Life Sciences, Hubei Key Laboratory of Genetic Regulation and Integrative Biology, Central China Normal University, Wuhan, Hubei, 430079, China
| | - Guo-Zheng Dai
- School of Life Sciences, Hubei Key Laboratory of Genetic Regulation and Integrative Biology, Central China Normal University, Wuhan, Hubei, 430079, China
| | - Philippe Juneau
- Department of Biological Sciences-TOXEN, Ecotoxicology of Aquatic Microorganisms Laboratory, Université du Québec à Montréal, CP8888 Succursale Centre-ville, Montréal, Québec, Canada, H3C 3P8
| | - Bao-Sheng Qiu
- School of Life Sciences, Hubei Key Laboratory of Genetic Regulation and Integrative Biology, Central China Normal University, Wuhan, Hubei, 430079, China
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