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Lee ZJ, Xie C, Ng K, Suleria HAR. Unraveling the bioactive interplay: seaweed polysaccharide, polyphenol and their gut modulation effect. Crit Rev Food Sci Nutr 2023:1-24. [PMID: 37991467 DOI: 10.1080/10408398.2023.2274453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Seaweed is rich in many unique bioactive compounds such as polyphenols and sulfated polysaccharides that are not found in terrestrial plant. The discovery of numerous biological activities from seaweed has made seaweed an attractive functional food source with the potential to be exploited for human health benefits. During food processing and digestion, cell wall polysaccharide and polyphenols commonly interact, and this may influence the nutritional properties of food. Interactions between cell wall polysaccharide and polyphenols in plant-based system has been extensively studied. However, similar interactions in seaweed have received little attention despite the vast disparity between the structural and chemical composition of plant and seaweed cell wall. This poses a challenge in extracting seaweed bioactive compounds with intact biological properties. This review aims to summarize the cell wall polysaccharide and polyphenols present in brown, red and green seaweed, and current knowledge on their potential interactions. Moreover, this review gives an overview of the gut modulation effect of seaweed polysaccharide and polyphenol.
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Affiliation(s)
- Zu Jia Lee
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
| | - Cundong Xie
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
| | - Ken Ng
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
| | - Hafiz A R Suleria
- School of Agriculture, Food and Ecosystem Sciences, Faculty of Science, The University of Melbourne, Parkville, Australia
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2
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Miwa Y, Awanthi MGG, Soga K, Tanaka A, Ito M, Numata Y, Sato Y, Konishi T. The Cell Wall Characterization of Brown Alga Cladosiphon okamuranus during Growth. PLANTS (BASEL, SWITZERLAND) 2023; 12:3274. [PMID: 37765437 PMCID: PMC10536011 DOI: 10.3390/plants12183274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/05/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023]
Abstract
The present study provides new insights into the growth of the brown algal cell wall by showing that cell wall polysaccharides play an important role in the process of growth, considering the physicochemical characteristic of young and old Cladosiphon okamuranus. To determine its structural variation in detail, the cell wall was sequentially fractionated into five fractions: hot water (HW), ammonium oxalate, hemicellulose-I (HC-I), HC-II, and cellulose, and analyzed physicochemically. Results showed that almost 80% of the total recovery cell wall from both young and old thalli was HW, and HC-I contained mainly fucoidan composed of Fucose, Glucuronic acid, and sulfate in molar ratios of 1.0:0.3:0.6~0.7 and 1.0:0.3:0.2~0.3, respectively. Fucoidan in HW was a highly sulfated matrix polysaccharide abundance in young thalli, while fucoidan in HC-I was rich in old thalli and functions as hemicellulose in land plants, crosslinking with cellulose and strengthening the cell wall. We found that HW and HC-I were particularly involved in the growth and strength of old thalli appeared to be due to the deposition of HC-I and the reduction in water content during the growth process.
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Affiliation(s)
- Yuka Miwa
- Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus, Senbaru, Nishihara-cho 903-0213, Okinawa, Japan
| | | | - Kouichi Soga
- Department of Biology, Graduate School of Science, Osaka Metropolitan University, Sugimoto, Sumiyoshi-ku 558-8585, Osaka, Japan
| | - Atsuko Tanaka
- Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Senbaru, Nishihara-cho 903-0213, Okinawa, Japan
| | - Michihiro Ito
- Center of Molecular Biosciences, Tropical Biosphere Research Center, University of the Ryukyus, Senbaru, Nishihara-cho 903-0213, Okinawa, Japan
| | - Yuichiro Numata
- Bio-Resources Business Development Division, Riken Food Co., Ltd., Miyauchi, Tagajo-shi 985-0844, Miyagi, Japan
| | - Yoichi Sato
- Bio-Resources Business Development Division, Riken Food Co., Ltd., Miyauchi, Tagajo-shi 985-0844, Miyagi, Japan
| | - Teruko Konishi
- Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus, Senbaru, Nishihara-cho 903-0213, Okinawa, Japan
- United Graduate School of Agricultural Sciences, Kagoshima University, Korimoto, Kagoshima-shi 890-0065, Kagoshima, Japan
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Islamova R, Yanshin N, Zamyatkina E, Gulk E, Zuy E, Billig S, Birkemeyer C, Tarakhovskaya E. Metabolic Adjustment of High Intertidal Alga Pelvetia canaliculata to the Tidal Cycle Includes Oscillations of Soluble Carbohydrates, Phlorotannins, and Citric Acid Content. Int J Mol Sci 2023; 24:10626. [PMID: 37445801 PMCID: PMC10341635 DOI: 10.3390/ijms241310626] [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: 05/31/2023] [Revised: 06/17/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023] Open
Abstract
The brown alga Pelvetia canaliculata is one of the species successfully adapted to intertidal conditions. Inhabiting the high intertidal zone, Pelvetia spends most of its life exposed to air, where it is subjected to desiccation, light, and temperature stresses. However, the physiological and biochemical mechanisms allowing this alga to tolerate such extreme conditions are still largely unknown. The objective of our study is to compare the biochemical composition of Pelvetia during the different phases of the tidal cycle. To our knowledge, this study is the first attempt to draft a detailed biochemical network underneath the complex physiological processes, conferring the successful survival of this organism in the harsh conditions of the high intertidal zone of the polar seas. We considered the tide-induced changes in relative water content, stress markers, titratable acidity, pigment, and phlorotannin content, as well as the low molecular weight metabolite profiles (GC-MS-based approach) in Pelvetia thalli. Thallus desiccation was not accompanied by considerable increase in reactive oxygen species content. Metabolic adjustment of P. canaliculata to emersion included accumulation of soluble carbohydrates, various phenolic compounds, including intracellular phlorotannins, and fatty acids. Changes in titratable acidity accompanied by the oscillations of citric acid content imply that some processes related to the crassulacean acid metabolism (CAM) may be involved in Pelvetia adaptation to the tidal cycle.
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Affiliation(s)
- Renata Islamova
- Department of Plant Physiology and Biochemistry, Faculty of Biology, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia; (R.I.)
| | - Nikolay Yanshin
- Department of Plant Physiology and Biochemistry, Faculty of Biology, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia; (R.I.)
| | - Elizaveta Zamyatkina
- Department of Plant Physiology and Biochemistry, Faculty of Biology, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia; (R.I.)
| | - Ekaterina Gulk
- Department of Plant Physiology and Biochemistry, Faculty of Biology, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia; (R.I.)
| | - Ekaterina Zuy
- Department of Plant Physiology and Biochemistry, Faculty of Biology, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia; (R.I.)
| | - Susan Billig
- Faculty of Chemistry and Mineralogy, Leipzig University, 04103 Leipzig, Germany (C.B.)
| | - Claudia Birkemeyer
- Faculty of Chemistry and Mineralogy, Leipzig University, 04103 Leipzig, Germany (C.B.)
- German Center for Integrative Biodiversity Research (iDiv) Halle-Leipzig-Jena, 04103 Leipzig, Germany
| | - Elena Tarakhovskaya
- Department of Plant Physiology and Biochemistry, Faculty of Biology, Saint Petersburg State University, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia; (R.I.)
- Vavilov Institute of General Genetics, Saint Petersburg Branch, Russian Academy of Science, Universitetskaya Nab., 7/9, 199034 Saint Petersburg, Russia
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Mazéas L, Yonamine R, Barbeyron T, Henrissat B, Drula E, Terrapon N, Nagasato C, Hervé C. Assembly and synthesis of the extracellular matrix in brown algae. Semin Cell Dev Biol 2023; 134:112-124. [PMID: 35307283 DOI: 10.1016/j.semcdb.2022.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/03/2022] [Accepted: 03/04/2022] [Indexed: 12/23/2022]
Abstract
In brown algae, the extracellular matrix (ECM) and its constitutive polymers play crucial roles in specialized functions, including algal growth and development. In this review we offer an integrative view of ECM construction in brown algae. We briefly report the chemical composition of its main constituents, and how these are interlinked in a structural model. We examine the ECM assembly at the tissue and cell level, with consideration on its structure in vivo and on the putative subcellular sites for the synthesis of its main constituents. We further discuss the biosynthetic pathways of two major polysaccharides, alginates and sulfated fucans, and the progress made beyond the candidate genes with the biochemical validation of encoded proteins. Key enzymes involved in the elongation of the glycan chains are still unknown and predictions have been made at the gene level. Here, we offer a re-examination of some glycosyltransferases and sulfotransferases from published genomes. Overall, our analysis suggests novel investigations to be performed at both the cellular and biochemical levels. First, to depict the location of polysaccharide structures in tissues. Secondly, to identify putative actors in the ECM synthesis to be functionally studied in the future.
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Affiliation(s)
- Lisa Mazéas
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France
| | - Rina Yonamine
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran 051-0013, Japan
| | - Tristan Barbeyron
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France
| | - Bernard Henrissat
- CNRS, Aix Marseille Univ, UMR 7257 AFMB, 13288 Marseille, France; INRAE, USC1408 AFMB, 13288 Marseille, France; Department of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia; Technical University of Denmark, DTU Bioengineering, DK-2800 Kgs., Lyngby, Denmark
| | - Elodie Drula
- CNRS, Aix Marseille Univ, UMR 7257 AFMB, 13288 Marseille, France; INRAE, USC1408 AFMB, 13288 Marseille, France
| | - Nicolas Terrapon
- CNRS, Aix Marseille Univ, UMR 7257 AFMB, 13288 Marseille, France; INRAE, USC1408 AFMB, 13288 Marseille, France
| | - Chikako Nagasato
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran 051-0013, Japan
| | - Cécile Hervé
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
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Aleixandre A, Gisbert M, Sineiro J, Moreira R, Rosell CM. In vitro inhibition of starch digestive enzymes by ultrasound-assisted extracted polyphenols from Ascophyllum nodosum seaweeds. J Food Sci 2022; 87:2405-2416. [PMID: 35590486 PMCID: PMC9324812 DOI: 10.1111/1750-3841.16202] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 04/14/2022] [Accepted: 04/30/2022] [Indexed: 12/16/2022]
Abstract
Seaweeds are gaining importance due to their antidiabetic characteristics. This study investigated the inhibitory effects of aqueous Ascophyllum nodosum extracts, obtained by ultrasound-assisted extraction with different sonication powers (70-90 W/cm2 ) and subjected to resin purification, against α-amylase and α-glucosidase enzymes. Different inhibition methodologies were carried out, preincubating the extract either with the enzyme or the substrate. Chemical characterization, in terms of proximate analysis, antioxidant capacity (2,2-diphenyl-1-picryl-hydrazyl-hydrate [DPPH] and FRAP), and polyphenols characteristics (reversed-phase high-performance liquid chromatography [RP-HPLC] and 1 H-NMR) were carried out to explain inhibitory activities of extracts. Sonication power did not influence the proximal composition nor antiradical activity of extracts, but increasing sonication power increased inhibition capacity (>15%) against both starch digestive enzymes. The extract purification largely improved the inhibition efficiency decreasing the IC50 of α-amylase and α-glucosidase by 3.0 and 6.1 times, respectively. Seaweed extracts showed greater inhibition effect when they were preincubated with the enzyme instead of the substrate. RP-HPLC together with 1 H-NMR spectra allowed relating the presence of uronic acids-polyphenols complexes and quinones in the extracts with the different inhibitory capacities of samples. PRACTICAL APPLICATION: The study confirms that ultrasound-assisted extracts from Ascophyllum nodosum can be used to inhibit digestive enzymes. This opens the alternative to be used in foods for modulating glycemic index.
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Affiliation(s)
- Andrea Aleixandre
- Institute of Agrochemistry and Food Technology (IATA‐CSIC)PaternaSpain
| | - Mauro Gisbert
- Department of Chemical EngineeringUniversidade de Santiago de CompostelaSantiago de CompostelaSpain
| | - Jorge Sineiro
- Department of Chemical EngineeringUniversidade de Santiago de CompostelaSantiago de CompostelaSpain
| | - Ramón Moreira
- Department of Chemical EngineeringUniversidade de Santiago de CompostelaSantiago de CompostelaSpain
| | - Cristina M. Rosell
- Institute of Agrochemistry and Food Technology (IATA‐CSIC)PaternaSpain
- Department of Food and Human Nutritional SciencesUniversity of ManitobaWinnipegCanada
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6
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Mizuta H, Uji T, Yasui H. Extracellular silicate uptake and deposition induced by oxidative burst in Saccharina japonica sporophytes (Phaeophyceae). ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Yonamine R, Ichihara K, Tsuyuzaki S, Hervé C, Motomura T, Nagasato C. Changes in Cell Wall Structure During Rhizoid Formation of Silvetia babingtonii (Fucales, Phaeophyceae) Zygotes. JOURNAL OF PHYCOLOGY 2021; 57:1356-1367. [PMID: 33932028 DOI: 10.1111/jpy.13178] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
We examined the ultrastructure of the cell wall and immunolocalization of alginates using specific antibodies against M-rich alginates and MG blocks during rhizoid formation in fucoid zygotes, Silvetia babingtonii. The thallus region of 24-h-old zygotes had a cell wall made of three layers with different fiber distribution. In the 12-h-old zygotes, three layers in the thallus were observed before rhizoid formation, namely the inner, middle, and outer layers. During rhizoid elongation, only the inner layer was apparent close to the rhizoid tip area. Immunoelectron microscopy detected M-rich blocks of alginate on the inner half of the cell wall, irrespective of the number of layers in the thallus and rhizoid regions. The MG blocks were seen to cover a slightly wider area than M-rich alginate blocks. It was suggested that parts of M in mannuronan would be rapidly converted to G, and MG-blocks are generated. Transcriptome analysis was performed using 3 -, 10 -, and 24-h-old zygotes after fertilization to examine the relationship between gene expression and alginate synthesis over time. The expression of two mannuronan C5-epimerase homologs that convert mannuronic acid into guluronic acid in alginates was upregulated or downregulated over the course of the examination.
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Affiliation(s)
- Rina Yonamine
- Graduate School of Environmental Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kensuke Ichihara
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan
| | - Shiro Tsuyuzaki
- Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Cécile Hervé
- Sorbonne Universités, CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff, 29680, Roscoff, France
| | - Taizo Motomura
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan
| | - Chikako Nagasato
- Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan
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Role and Evolution of the Extracellular Matrix in the Acquisition of Complex Multicellularity in Eukaryotes: A Macroalgal Perspective. Genes (Basel) 2021; 12:genes12071059. [PMID: 34356075 PMCID: PMC8307928 DOI: 10.3390/genes12071059] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 07/05/2021] [Accepted: 07/08/2021] [Indexed: 12/12/2022] Open
Abstract
Multicellular eukaryotes are characterized by an expanded extracellular matrix (ECM) with a diversified composition. The ECM is involved in determining tissue texture, screening cells from the outside medium, development, and innate immunity, all of which are essential features in the biology of multicellular eukaryotes. This review addresses the origin and evolution of the ECM, with a focus on multicellular marine algae. We show that in these lineages the expansion of extracellular matrix played a major role in the acquisition of complex multicellularity through its capacity to connect, position, shield, and defend the cells. Multiple innovations were necessary during these evolutionary processes, leading to striking convergences in the structures and functions of the ECMs of algae, animals, and plants.
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Emeline CB, Ludovic D, Laurent V, Catherine L, Kruse I, Erwan AG, Florian W, Philippe P. Induction of Phlorotannins and Gene Expression in the Brown Macroalga Fucus vesiculosus in Response to the Herbivore Littorina littorea. Mar Drugs 2021; 19:185. [PMID: 33810577 PMCID: PMC8067260 DOI: 10.3390/md19040185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/23/2021] [Accepted: 03/23/2021] [Indexed: 01/05/2023] Open
Abstract
Mechanisms related to the induction of phlorotannin biosynthesis in marine brown algae remain poorly known. Several studies undertaken on fucoid species have shown that phlorotannins accumulate in the algae for several days or weeks after being exposed to grazing, and this is measured by direct quantification of soluble phenolic compounds. In order to investigate earlier inducible responses involved in phlorotannin metabolism, Fucus vesiculosus was studied between 6 and 72 h of grazing by the sea snail Littorina littorea. In this study, the quantification of soluble phenolic compounds was complemented by a Quantitative real-time PCR (qRT-PCR) approach applied on genes that are potentially involved in either the phlorotannin metabolism or stress responses. Soluble phlorotannin levels remained stable during the kinetics and increased significantly only after 12 h in the presence of grazers, compared to the control, before decreasing to the initial steady state for the rest of the kinetics. Under grazing conditions, the expression of vbpo, cyp450 and ast6 genes was upregulated, respectively, at 6 h, 12 h and 24 h, and cyp450 gene was downregulated after 72 h. Interestingly, the pksIII gene involved in the synthesis of phloroglucinol was overexpressed under grazing conditions after 24 h and 72 h. This study supports the hypothesis that phlorotannins are able to provide an inducible chemical defense under grazing activity, which is regulated at different stages of the stress response.
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Affiliation(s)
- Creis Bendelac Emeline
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
- International Research Laboratory IRL 3614, CNRS, Sorbonne Université, PUC, UACH, Evolutionary Biology and Ecology of Algae, EBEA, Station Biologique, 29680 Roscoff, Brittany, France
| | - Delage Ludovic
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| | - Vallet Laurent
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| | - Leblanc Catherine
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
| | - Inken Kruse
- Helmholtz Centre for Ocean Research (GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany; (I.K.); (W.F.)
| | - Ar Gall Erwan
- Laboratoire des Sciences de l’Environnement Marin, UBO European Institute for Marine Studies IUEM, University of Brest—Western Brittany, UMR 6539 LEMAR, Technopôle Brest Iroise, Rue Dumont d’Urville, 29280 Plouzané, Brittany, France
| | - Weinberger Florian
- Helmholtz Centre for Ocean Research (GEOMAR), Düsternbrooker Weg 20, 24105 Kiel, Germany; (I.K.); (W.F.)
| | - Potin Philippe
- Integrative Biology of Marine Models (LBI2M), CNRS, Sorbonne Université, UMR 8227, Station Biologique, Place Georges Teissier, 29680 Roscoff, Brittany, France; (C.B.E.); (D.L.); (V.L.); (L.C.)
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10
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Del Mondo A, Smerilli A, Ambrosino L, Albini A, Noonan DM, Sansone C, Brunet C. Insights into phenolic compounds from microalgae: structural variety and complex beneficial activities from health to nutraceutics. Crit Rev Biotechnol 2021; 41:155-171. [PMID: 33530761 DOI: 10.1080/07388551.2021.1874284] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Phenolic compounds (PCs) are a family of secondary metabolites with recognized biological activities making them attractive for the biomedical "red" biotechnology. The development of the eco-sustainable production of natural bioactive metabolites requires using easy cultivable organisms, such as microalgae, which represents one of the most promising sources for biotechnological applications. Microalgae are photosynthetic organisms inhabiting aquatic systems, displaying high levels of biological and functional diversities, and are well-known producers of fatty acids and carotenoids. They are also rich in other families of bioactive molecules e.g. phenolic compounds. Microalgal PCs however are less investigated than other molecular components. This study aims to provide a state-of-art picture of the actual knowledge on microalgal phenolic compounds, reviewing information on the PC content variety and chemodiversity in microalgae, their environmental modulation, and we aim to report discuss data on PC biosynthetic pathways. We report the challenges of promoting microalgae as a relevant source of natural PCs, further enhancing the interests of microalgal "biofactories" for biotechnological applications (i.e. nutraceutical, pharmacological, or cosmeceutical products).
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Affiliation(s)
- Angelo Del Mondo
- Stazione Zoologica Anton Dohrn, Istituto Nazionale di Biologia, Ecologia e Biotecnologie marine, Napoli, Italy
| | - Arianna Smerilli
- Stazione Zoologica Anton Dohrn, Istituto Nazionale di Biologia, Ecologia e Biotecnologie marine, Napoli, Italy
| | - Luca Ambrosino
- Stazione Zoologica Anton Dohrn, Istituto Nazionale di Biologia, Ecologia e Biotecnologie marine, Napoli, Italy
| | - Adriana Albini
- Laboratory of Vascular Biology and Angiogenesis, IRCCS MultiMedica, Milan, Italy
| | - Douglas M Noonan
- Laboratory of Vascular Biology and Angiogenesis, IRCCS MultiMedica, Milan, Italy.,Department of Biotechnology and Life Sciences, University of Insubria, Varese, Italy
| | - Clementina Sansone
- Stazione Zoologica Anton Dohrn, Istituto Nazionale di Biologia, Ecologia e Biotecnologie marine, Napoli, Italy
| | - Christophe Brunet
- Stazione Zoologica Anton Dohrn, Istituto Nazionale di Biologia, Ecologia e Biotecnologie marine, Napoli, Italy
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Birkemeyer C, Lemesheva V, Billig S, Tarakhovskaya E. Composition of Intracellular and Cell Wall-Bound Phlorotannin Fractions in Fucoid Algae Indicates Specific Functions of These Metabolites Dependent on the Chemical Structure. Metabolites 2020; 10:E369. [PMID: 32933101 PMCID: PMC7570113 DOI: 10.3390/metabo10090369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/07/2020] [Accepted: 09/09/2020] [Indexed: 01/03/2023] Open
Abstract
Accumulation of biologically active metabolites is a specific feature of plant biochemistry, directing the use of plants in numerous applications in the pharmaceutical and food industries. Among these substances, the plethora of phenolic compounds has attracted particular interest among researchers. Here, we report on new findings in phlorotannin research, a large group of multifunctional phenolic substances, produced in brown algae. Comprehensive LC-MS profiling of three algal species allowed us to depict the complex pattern of this structurally diverse compound group across different tissues and subcellular compartments. We compiled more than 30 different phlorotannin series in one sample and used accurate mass spectrometry to assign tentative structures to the observed ions based on the confirmed sum formulas. From that, we found that acetylation, hydroxylation, and oxidation are likely to be the most common in vivo modifications to phlorotannins. Using an alternative data mining strategy to cope with extensive coelution and structural isomers, we quantitatively compared the intensity of different phlorotannin series in species, tissues, and subcellular compartments to learn more about their physiological functions. The structure and intra-thallus profiles of cell wall-bound phlorotannins were studied here for the first time. We suggest that one of the major dibenzodioxin-type phlorotannin series may exclusively target integration into the cell wall of fucoid algae.
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Affiliation(s)
- Claudia Birkemeyer
- Faculty of Chemistry and Mineralogy, University of Leipzig, 04103 Leipzig, Germany;
| | - Valeriya Lemesheva
- Department of Plant Physiology and Biochemistry, Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia;
| | - Susan Billig
- Faculty of Chemistry and Mineralogy, University of Leipzig, 04103 Leipzig, Germany;
| | - Elena Tarakhovskaya
- Department of Plant Physiology and Biochemistry, Faculty of Biology, St. Petersburg State University, 199034 St. Petersburg, Russia;
- Department of Scientific Information, Russian Academy of Sciences Library, 199034 St. Petersburg, Russia
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Santos SAO, Félix R, Pais ACS, Rocha SM, Silvestre AJD. The Quest for Phenolic Compounds from Macroalgae: A Review of Extraction and Identification Methodologies. Biomolecules 2019; 9:E847. [PMID: 31835386 PMCID: PMC6995553 DOI: 10.3390/biom9120847] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 11/12/2019] [Accepted: 11/25/2019] [Indexed: 12/16/2022] Open
Abstract
The current interest of the scientific community for the exploitation of high-value compounds from macroalgae is related to the increasing knowledge of their biological activities and health benefits. Macroalgae phenolic compounds, particularly phlorotannins, have gained particular attention due to their specific bioactivities, including antioxidant, antiproliferative, or antidiabetic. Notwithstanding, the characterization of macroalgae phenolic compounds is a multi-step task, with high challenges associated with their isolation and characterization, due to the highly complex and polysaccharide-rich matrix of macroalgae. Therefore, this fraction is far from being fully explored. In fact, a critical revision of the extraction and characterization methodologies already used in the analysis of phenolic compounds from macroalgae is lacking in the literature, and it is of uttermost importance to compile validated methodologies and discourage misleading practices. The aim of this review is to discuss the state-of-the-art of phenolic compounds already identified in green, red, and brown macroalgae, reviewing their structural classification, as well as critically discussing extraction methodologies, chromatographic separation techniques, and the analytical strategies for their characterization, including information about structural identification techniques and key spectroscopic profiles. For the first time, mass spectrometry data of phlorotannins, a chemical family quite exclusive of macroalgae, is compiled and discussed.
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Affiliation(s)
- Sónia A. O. Santos
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; (A.C.S.P.); (A.J.D.S.)
| | - Rafael Félix
- On Leave MARE—Marine and Environmental Sciences Centre, ESTM, Instituto Politécnico de Leiria, 2520-620 Peniche, Portugal;
| | - Adriana C. S. Pais
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; (A.C.S.P.); (A.J.D.S.)
| | - Sílvia M. Rocha
- QOPNA/LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal;
| | - Armando J. D. Silvestre
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal; (A.C.S.P.); (A.J.D.S.)
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Machado Monteiro CM, Li H, Bischof K, Bartsch I, Valentin KU, Corre E, Collén J, Harms L, Glöckner G, Heinrich S. Is geographical variation driving the transcriptomic responses to multiple stressors in the kelp Saccharina latissima? BMC PLANT BIOLOGY 2019; 19:513. [PMID: 31775614 PMCID: PMC6881991 DOI: 10.1186/s12870-019-2124-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 11/07/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Kelps (Laminariales, Phaeophyceae) are brown macroalgae of utmost ecological, and increasingly economic, importance on temperate to polar rocky shores. Omics approaches in brown algae are still scarce and knowledge of their acclimation mechanisms to the changing conditions experienced in coastal environments can benefit from the application of RNA-sequencing. Despite evidence of ecotypic differentiation, transcriptomic responses from distinct geographical locations have, to our knowledge, never been studied in the sugar kelp Saccharina latissima so far. RESULTS In this study we investigated gene expression responses using RNA-sequencing of S. latissima from environments with contrasting temperature and salinity conditions - Roscoff, in temperate eastern Atlantic, and Spitsbergen in the Arctic. Juvenile sporophytes derived from uniparental stock cultures from both locations were pre-cultivated at 8 °C and SA 30. Sporophytes acclimated to 0 °C, 8 °C and 15 °C were exposed to a low salinity treatment (SA 20) for 24 h. Hyposalinity had a greater impact at the transcriptomic level than the temperature alone, and its effects were modulated by temperature. Namely, photosynthesis and pigment synthesis were extensively repressed by low salinity at low temperatures. Although some responses were shared among sporophytes from the different sites, marked differences were revealed by principal component analysis, differential expression and GO enrichment. The interaction between low temperature and low salinity drove the largest changes in gene expression in sporophytes from Roscoff while specimens from Spitsbergen required more metabolic adjustment at higher temperatures. Moreover, genes related to cell wall adjustment were differentially expressed between Spitsbergen and Roscoff control samples. CONCLUSIONS Our study reveals interactive effects of temperature and salinity on transcriptomic profiles in S. latissima. Moreover, our data suggest that under identical culture conditions sporophytes from different locations diverge in their transcriptomic responses. This is probably connected to variations in temperature and salinity in their respective environment of origin. The current transcriptomic results support the plastic response pattern in sugar kelp which is a species with several reported ecotypes. Our data provide the baseline for a better understanding of the underlying processes of physiological plasticity and may help in the future to identify strains adapted to specific environments and its genetic control.
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Affiliation(s)
- Cátia Marina Machado Monteiro
- Marine Botany, Faculty Biology/Chemistry, University of Bremen, Bremen, Germany
- Station Biologique de Roscoff, plateforme ABiMS, CNRS: FR2424, Sorbonne Université (UPMC), 29680 Roscoff, France
- Sorbonne Université, CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff, 29680 Roscoff, France
| | - Huiru Li
- Marine Botany, Faculty Biology/Chemistry, University of Bremen, Bremen, Germany
- Fisheries College, Ocean University of China, Qingdao, China
| | - Kai Bischof
- Marine Botany, Faculty Biology/Chemistry, University of Bremen, Bremen, Germany
| | - Inka Bartsch
- Alfred-Wegener-Institute, Helmholtz Centre for Marine and Polar Research, Bremerhaven, Germany
| | - Klaus Ulrich Valentin
- Alfred-Wegener-Institute, Helmholtz Centre for Marine and Polar Research, Bremerhaven, Germany
| | - Erwan Corre
- Station Biologique de Roscoff, plateforme ABiMS, CNRS: FR2424, Sorbonne Université (UPMC), 29680 Roscoff, France
| | - Jonas Collén
- Sorbonne Université, CNRS, Integrative Biology of Marine Models (LBI2M), Station Biologique de Roscoff, 29680 Roscoff, France
| | - Lars Harms
- Alfred-Wegener-Institute, Helmholtz Centre for Marine and Polar Research, Bremerhaven, Germany
| | - Gernot Glöckner
- Institute for Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany
| | - Sandra Heinrich
- Institute for Plant Science and Microbiology, University of Hamburg, Hamburg, Germany
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14
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Rabillé H, Torode TA, Tesson B, Le Bail A, Billoud B, Rolland E, Le Panse S, Jam M, Charrier B. Alginates along the filament of the brown alga Ectocarpus help cells cope with stress. Sci Rep 2019; 9:12956. [PMID: 31506545 PMCID: PMC6736953 DOI: 10.1038/s41598-019-49427-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 08/23/2019] [Indexed: 11/29/2022] Open
Abstract
Ectocarpus is a filamentous brown alga, which cell wall is composed mainly of alginates and fucans (80%), two non-crystalline polysaccharide classes. Alginates are linear chains of epimers of 1,4-linked uronic acids, β-D-mannuronic acid (M) and α-L-guluronic acid (G). Previous physico-chemical studies showed that G-rich alginate gels are stiffer than M-rich alginate gels when prepared in vitro with calcium. In order to assess the possible role of alginates in Ectocarpus, we first immunolocalised M-rich or G-rich alginates using specific monoclonal antibodies along the filament. As a second step, we calculated the tensile stress experienced by the cell wall along the filament, and varied it with hypertonic or hypotonic solutions. As a third step, we measured the stiffness of the cell along the filament, using cell deformation measurements and atomic force microscopy. Overlapping of the three sets of data allowed to show that alginates co-localise with the stiffest and most stressed areas of the filament, namely the dome of the apical cell and the shanks of the central round cells. In addition, no major distinction between M-rich and G-rich alginate spatial patterns could be observed. Altogether, these results support that both M-rich and G-rich alginates play similar roles in stiffening the cell wall where the tensile stress is high and exposes cells to bursting, and that these roles are independent from cell growth and differentiation.
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Affiliation(s)
- Hervé Rabillé
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
| | - Thomas A Torode
- The Sainsbury Laboratory, University of Cambridge, Bateman Street, Cambridge, United Kingdom
| | - Benoit Tesson
- Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
| | - Aude Le Bail
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
- Department of Cell Biology, Friedrich-Alexander-University of Erlangen-Nürnberg, Erlangen, Germany
| | - Bernard Billoud
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
| | - Elodie Rolland
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France
| | - Sophie Le Panse
- Platform Merimage, FR 2424, CNRS, Station Biologique, Roscoff, France
| | - Murielle Jam
- Marine Glycobiology team, UMR8227, CNRS-UPMC, Station Biologique, Roscoff, France
| | - Bénédicte Charrier
- CNRS, Sorbonne Université, Laboratoire de Biologie Intégrative des Modèles Marins LBI2M, Station Biologique, Roscoff, France.
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15
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Leri AC, Dunigan MR, Wenrich RL, Ravel B. Particulate organohalogens in edible brown seaweeds. Food Chem 2019; 272:126-132. [PMID: 30309522 DOI: 10.1016/j.foodchem.2018.08.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 08/08/2018] [Accepted: 08/10/2018] [Indexed: 12/22/2022]
Abstract
Brown algae, rich in antioxidants and other bioactive compounds, are important dietary seaweeds in many cultures. Like other marine macroalgae, brown seaweeds are known to accumulate the halogens iodine and bromine. Comparatively little is known about the chemistry of chlorine in seaweeds. We used synchrotron-based X-ray absorption spectroscopy to measure total non-volatile organochlorine and -bromine in five edible brown seaweeds: Laminaria digitata, Fucus vesiculosus, Pelvetia canaliculata, Saccharina latissima, and Undaria pinnatifida. Organochlorine concentrations range from 120 to 630 mg·kg-1 dry weight and organobromine from 150 to 360 mg·kg-1, comprising mainly aromatic organohalogens in both cases. Aliphatic organochlorine exceeds aliphatic organobromine but is positively correlated with it among the seaweeds. Higher organochlorine levels appear in samples with more lipid moieties, suggesting lipid chlorination as a possible formation pathway. Particulate organohalogens are not correlated with antioxidant activity or polyphenolic content in seaweed extracts. Such compounds likely contribute to organohalogen body burden in humans and other organisms.
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Affiliation(s)
- Alessandra C Leri
- Department of Natural Sciences, Marymount Manhattan College, 221 E 71st St., New York, NY 10021, USA.
| | - Marisa R Dunigan
- Department of Natural Sciences, Marymount Manhattan College, 221 E 71st St., New York, NY 10021, USA
| | - Rosie L Wenrich
- Department of Natural Sciences, Marymount Manhattan College, 221 E 71st St., New York, NY 10021, USA
| | - Bruce Ravel
- National Institute of Standards and Technology, 100 Bureau Drive MS 8520, Gaithersburg, MD 20899, USA
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16
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Kerrison PD, Stanley MS, Mitchell E, Cunningham L, Hughes AD. A life-stage conflict of interest in kelp: Higher meiospore settlement where sporophyte attachment is weak. ALGAL RES 2018. [DOI: 10.1016/j.algal.2018.08.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Wever R, Krenn BE, Renirie R. Marine Vanadium-Dependent Haloperoxidases, Their Isolation, Characterization, and Application. Methods Enzymol 2018; 605:141-201. [PMID: 29909824 DOI: 10.1016/bs.mie.2018.02.026] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Vanadium-dependent haloperoxidases in seaweeds, cyanobacteria, fungi, and possibly phytoplankton play an important role in the release of halogenated volatile compounds in the environment. These halocarbons have effects on atmospheric chemistry since they cause ozone depletion. In this chapter, a survey is given of the different sources of these enzymes, some of their properties, the various methods to isolate them, and the bottlenecks in purification. The assays to detect and quantify haloperoxidase activity are described as well as their kinetic properties. Several practical tips and pitfalls are given which have not yet been published explicitly. Recent developments in research on structure and function of these enzymes are reviewed. Finally, the application of vanadium-dependent haloperoxidases in the biosynthesis of brominated and other compounds is discussed.
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Affiliation(s)
- Ron Wever
- University of Amsterdam, Van't Hoff Institute for Molecular Sciences, Amsterdam, The Netherlands.
| | - Bea E Krenn
- University of Amsterdam, Innovation Exchange Amsterdam, Amsterdam, The Netherlands
| | - Rokus Renirie
- University of Amsterdam, Van't Hoff Institute for Molecular Sciences, Amsterdam, The Netherlands
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18
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de Carvalho RT, Rocha GM, Paradas WC, Soares AR, Ank Guarino G, Passos RMF, Amado Filho GM, Farina M, Salgado LT. Cell wall physicochemical properties determine the thallus biomineralization pattern of Padina gymnospora (Phaeophyceae). JOURNAL OF PHYCOLOGY 2017; 53:1294-1304. [PMID: 28990189 DOI: 10.1111/jpy.12596] [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: 09/20/2016] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
Approximately half of the Padina (Dictyotales, Phaeophyceae) species mineralize aragonite needles over the adaxial thallus surface, where mineral bands are interspersed with nonmineralized regions along the thallus from the apical to basal end. However, this calcification pattern and the related algal properties are not well understood. Therefore, this work was performed to elucidate a potential role of cell walls in the inhibition/induction of mineralization in the brown alga Padina gymnospora. In a comparison of specific thallus regions, differences were identified in the cellulose distribution, microfibrils arrangement and thickness, distribution and abundance of phenolic substances, and physical differences among the surfaces of the thallus (deformation, adhesion, topography, and nano-rugosity). In vitro mineralization assays indicated that phenolic substances are strong modulators of calcium carbonate crystals growth. In addition, de novo mineralization assays over cell wall surfaces that were used as templates, even without cellular activity, indicated that the cell wall remains a key factor in the induction/inhibition of mineralization. Overall, the current findings indicate a strong correlation between the physico-chemical and structural properties of the cell wall and the alternation pattern of the mineralization bands over the thallus of P. gymnospora.
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Affiliation(s)
| | - Gustavo Miranda Rocha
- Laboratório de Física Biológica, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, 21941-902, Brazil
| | - Wladimir Costa Paradas
- Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rio de Janeiro, 22460-030, Brazil
| | - Angélica Ribeiro Soares
- Grupo de Produtos Naturais de Organismos Aquáticos (GPNOA), Núcleo em Ecologia e Desenvolvimento Socioambiental de Macaé, Macaé, Rio de Janeiro, 27901-000, Brazil
| | - Gláucia Ank Guarino
- Departamento de Biologia Marinha, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24001-970, Brazil
| | | | | | - Marcos Farina
- Laboratório de Biomineralização, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
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19
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Deniaud-Bouët E, Hardouin K, Potin P, Kloareg B, Hervé C. A review about brown algal cell walls and fucose-containing sulfated polysaccharides: Cell wall context, biomedical properties and key research challenges. Carbohydr Polym 2017; 175:395-408. [PMID: 28917882 DOI: 10.1016/j.carbpol.2017.07.082] [Citation(s) in RCA: 151] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 07/04/2017] [Accepted: 07/28/2017] [Indexed: 12/12/2022]
Abstract
Studies on brown algal cell walls have entered a new phase with the concomitant discovery of novel polysaccharides present in cell walls and the establishment of a comprehensive generic model for cell wall architecture. Brown algal cell walls are composites of structurally complex polysaccharides. In this review we discuss the most recent progress in the structural composition of brown algal cell walls, emphasizing the significance of extraction and screening techniques, and the biological activities of the corresponding polysaccharides, with a specific focus on the fucose-containing sulfated polysaccharides. They include valuable marine molecules that exert a broad range of pharmacological properties such as antioxidant and anti-inflammatory activities, functions in the regulation of immune responses and of haemostasis, anti-infectious and anticancer actions. We identify the key remaining challenges in this research field.
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Affiliation(s)
- Estelle Deniaud-Bouët
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
| | - Kevin Hardouin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
| | - Philippe Potin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
| | - Bernard Kloareg
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
| | - Cécile Hervé
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France; CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, Roscoff, France.
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20
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Terauchi M, Yamagishi T, Hanyuda T, Kawai H. Genome-wide computational analysis of the secretome of brown algae (Phaeophyceae). Mar Genomics 2017; 32:49-59. [PMID: 28063828 DOI: 10.1016/j.margen.2016.12.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/06/2016] [Accepted: 12/16/2016] [Indexed: 11/25/2022]
Abstract
Brown algae have evolved complex multicellularity in the heterokont lineage. They are phylogenetically distant to land plants, fungi and animals. Especially, the members of Laminariales (so-called kelps) have developed highly differentiated tissues. Extracellular matrix (ECM) plays pivotal roles in a number of essential processes in multicellular organisms, such as cell adhesion, cell and tissue differentiations, cell-to-cell communication, and responses to environmental stimuli. In these processes, a set of extracellular secreted proteins called the secretome operates remodeling of the physicochemical nature of ECM and signal transduction by interacting with cell surface proteins and signaling molecules. Characterization of the secretome is a critical step to clarify the contributions of ECM to the multicellularity of brown algae. However, the identity of the brown algal secretome has been poorly understood. In order to reveal the repertory of the brown algal secretome and its involvement in the evolution of Laminariales, we conducted a genome-wide analysis of the brown algal secretome utilizing the published complete genome data of Ectocarpus siliculosus and Saccharina japonica as well as newly obtained RNA-seq data of seven laminarialean species (Agarum clathratum, Alaria crassifolia, Aureophycus aleuticus, Costaria costata, Pseudochorda nagaii, Saccharina angustata and Undaria pinnatifida) largely covering the laminarialean families. We established the in silico pipeline to systematically and accurately detect the secretome by combining multiple prediction algorithms for the N-terminal signal peptide and transmembrane domain within the protein sequence. From 16,189 proteins of E. siliculosus and 18,733 proteins of S. japonica, 552 and 964 proteins respectively were predicted to be classified as the secretome. Conserved domain analysis showed that the domain repertory were very similar to each other, and that of the brown algal secretome was partially common with that of the secretome of other multicellular organisms (land plants, fungi and animals). In the laminarialean species, it was estimated that the gene abundance and the domain architecture of putative ECM remodeling-related proteins were altered compared with those of E. siliculosus, and that the alteration started from the basal group of Laminariales. These results suggested that brown algae have developed their own secretome, and its functions became more elaborated in the more derived members in Laminariales.
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Affiliation(s)
- Makoto Terauchi
- Organization for Advanced and Integrated Research, Kobe University, Kobe 657-8501, Japan.
| | | | - Takeaki Hanyuda
- Research Center for Inland Seas, Kobe University, Kobe 657-8501, Japan
| | - Hiroshi Kawai
- Research Center for Inland Seas, Kobe University, Kobe 657-8501, Japan
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21
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Wang CS, Pan H, Weerasekare GM, Stewart RJ. Peroxidase-catalysed interfacial adhesion of aquatic caddisworm silk. J R Soc Interface 2016; 12:rsif.2015.0710. [PMID: 26490632 DOI: 10.1098/rsif.2015.0710] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Casemaker caddisfly (Hesperophylax occidentalis) larvae use adhesive silk fibres to construct protective shelters under water. The silk comprises a distinct peripheral coating on a viscoelastic fibre core. Caddisworm silk peroxinectin (csPxt), a haem-peroxidase, was shown to be glycosylated by lectin affinity chromatography and tandem mass spectrometry. Using high-resolution H2O2 and peroxidase-dependent silver ion reduction and nanoparticle deposition, imaged by electron microscopy, csPxt activity was shown to be localized in the peripheral layer of drawn silk fibres. CsPxt catalyses dityrosine cross-linking within the adhesive peripheral layer post-draw, initiated perhaps by H2O2 generated by a silk gland-specific superoxide dismutase 3 (csSOD3) from environmental reactive oxygen species present in natural water. CsSOD3 was also shown to be a glycoprotein and is likely localized in the peripheral layer. Using a synthetic fluorescent phenolic copolymer and confocal microscopy, it was shown that csPxt catalyses oxidative cross-linking to external polyphenolic compounds capable of diffusive interpenetration into the fuzzy peripheral coating, including humic acid, a natural surface-active polyphenol. The results provide evidence of enzyme-mediated covalent cross-linking of a natural bioadhesive to polyphenol conditioned interfaces as a mechanism of permanent adhesion underwater.
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Affiliation(s)
- Ching-Shuen Wang
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
| | - Huaizhong Pan
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
| | | | - Russell J Stewart
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
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22
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Strittmatter M, Grenville-Briggs LJ, Breithut L, Van West P, Gachon CMM, Küpper FC. Infection of the brown alga Ectocarpus siliculosus by the oomycete Eurychasma dicksonii induces oxidative stress and halogen metabolism. PLANT, CELL & ENVIRONMENT 2016; 39:259-71. [PMID: 25764246 PMCID: PMC4949667 DOI: 10.1111/pce.12533] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 11/03/2014] [Accepted: 02/07/2015] [Indexed: 05/24/2023]
Abstract
Pathogens are increasingly being recognized as key evolutionary and ecological drivers in marine ecosystems. Defence mechanisms of seaweeds, however, have mostly been investigated by mimicking infection using elicitors. We have established an experimental pathosystem between the genome brown model seaweed Ectocarpus siliculosus and the oomycete Eurychasma dicksonii as a powerful new tool to investigate algal responses to infection. Using proteomics, we identified 21 algal proteins differentially accumulated in response to Eu. dicksonii infection. These include classical algal stress response proteins such as a manganese superoxide dismutase, heat shock proteins 70 and a vanadium bromoperoxidase. Transcriptional profiling by qPCR confirmed the induction of the latter during infection. The accumulation of hydrogen peroxide was observed at different infection stages via histochemical staining. Inhibitor studies confirmed that the main source of hydrogen peroxide is superoxide converted by superoxide dismutase. Our data give an unprecedented global overview of brown algal responses to pathogen infection, and highlight the importance of oxidative stress and halogen metabolism in these interactions. This suggests overlapping defence pathways with herbivores and abiotic stresses. We also identify previously unreported actors, in particular a Rad23 and a plastid-lipid-associated protein, providing novel insights into the infection and defence processes in brown algae.
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Affiliation(s)
- Martina Strittmatter
- The Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll, Scotland, PA37 1QA, UK
- Aberdeen Oomycete Laboratory, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, Scotland, AB25 2ZD, UK
| | - Laura J Grenville-Briggs
- Aberdeen Oomycete Laboratory, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, Scotland, AB25 2ZD, UK
- Department of Plant Protection Biology, Swedish University of Agricultural Sciences, Alnarp, 230 53, Sweden
| | - Lisa Breithut
- Fachbereich Biologie, Universität Konstanz, Konstanz, D-78457, Germany
| | - Pieter Van West
- Aberdeen Oomycete Laboratory, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, Scotland, AB25 2ZD, UK
| | - Claire M M Gachon
- The Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll, Scotland, PA37 1QA, UK
| | - Frithjof C Küpper
- The Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll, Scotland, PA37 1QA, UK
- Oceanlab, University of Aberdeen, Main Street, Newburgh, Scotland, AB41 6AA, UK
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Creis E, Delage L, Charton S, Goulitquer S, Leblanc C, Potin P, Ar Gall E. Constitutive or Inducible Protective Mechanisms against UV-B Radiation in the Brown Alga Fucus vesiculosus? A Study of Gene Expression and Phlorotannin Content Responses. PLoS One 2015; 10:e0128003. [PMID: 26030665 PMCID: PMC4452539 DOI: 10.1371/journal.pone.0128003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 04/21/2015] [Indexed: 11/18/2022] Open
Abstract
A role as UV sunscreens has been suggested for phlorotannins, the phenolic compounds that accumulate in brown algae in response to a number of external stimuli and take part in cell wall structure. After exposure of the intertidal brown alga Fucus vesiculosus to artificial UV-B radiation, we examined its physiological responses by following the transcript level of the pksIII gene encoding a phloroglucinol synthase, likely to be involved in the first step of phlorotannins biosynthesis. We also monitored the expression of three targeted genes, encoding a heat shock protein (hsp70), which is involved in global stress responses, an aryl sulfotransferase (ast), which could be involved in the sulfation of phlorotannins, and a vanadium bromoperoxidase (vbpo), which can potentially participate in the scavenging of Reactive Oxygen Species (ROS) and in the cross-linking and condensation of phlorotannins. We investigated whether transcriptional regulation of these genes is correlated with an induction of phlorotannin accumulation by establishing metabolite profiling of purified fractions of low molecular weight phlorotannins. Our findings demonstrated that a high dose of UV-B radiation induced a significant overexpression of hsp70 after 12 and 24 hours following the exposure to the UV-B treatment, compared to control treatment. The physiological performance of algae quantified by the photosynthetic efficiency (Fv/Fm) was slightly reduced. However UV-B treatment did not induce the accumulation of soluble phlorotannins in F. vesiculosus during the kinetics of four weeks, a result that may be related to the lack of induction of the pksIII gene expression. Taken together these results suggest a constitutive accumulation of phlorotannins occurring during the development of F.vesiculosus, rather than inducible processes. Gene expression studies and phlorotannin profiling provide here complementary approaches to global quantifications currently used in studies of phenolic compounds in brown algae.
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Affiliation(s)
- Emeline Creis
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Ludovic Delage
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Sophie Charton
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Sophie Goulitquer
- Centre de Ressources de Biologie Marine, MetaboMer Mass Spectrometry Core Facility, CNRS FR2424, Station Biologique de Roscoff, 29688, Roscoff cedex, Brittany, France
| | - Catherine Leblanc
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Philippe Potin
- Sorbonne Université, UPMC Univ Paris 06, CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688, Roscoff cedex, France
| | - Erwan Ar Gall
- Université Européenne de Bretagne, Université de Bretagne Occidentale, Laboratoire des Sciences de l’Environnement Marin, Unité Mixte de Recherche, Centre National de la Recherche Scientifique 6539, Institut Européen d’Etudes Marines-IUEM, 29280, Plouzané, Brittany, France
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Deniaud-Bouët E, Kervarec N, Michel G, Tonon T, Kloareg B, Hervé C. Chemical and enzymatic fractionation of cell walls from Fucales: insights into the structure of the extracellular matrix of brown algae. ANNALS OF BOTANY 2014; 114:1203-16. [PMID: 24875633 PMCID: PMC4195554 DOI: 10.1093/aob/mcu096] [Citation(s) in RCA: 145] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 04/09/2014] [Indexed: 05/02/2023]
Abstract
BACKGROUND AND AIMS Brown algae are photosynthetic multicellular marine organisms evolutionarily distant from land plants, with a distinctive cell wall. They feature carbohydrates shared with plants (cellulose), animals (fucose-containing sulfated polysaccharides, FCSPs) or bacteria (alginates). How these components are organized into a three-dimensional extracellular matrix (ECM) still remains unclear. Recent molecular analysis of the corresponding biosynthetic routes points toward a complex evolutionary history that shaped the ECM structure in brown algae. METHODS Exhaustive sequential extractions and composition analyses of cell wall material from various brown algae of the order Fucales were performed. Dedicated enzymatic degradations were used to release and identify cell wall partners. This approach was complemented by systematic chromatographic analysis to study polymer interlinks further. An additional structural assessment of the sulfated fucan extracted from Himanthalia elongata was made. KEY RESULTS The data indicate that FCSPs are tightly associated with proteins and cellulose within the walls. Alginates are associated with most phenolic compounds. The sulfated fucans from H. elongata were shown to have a regular α-(1→3) backbone structure, while an alternating α-(1→3), (1→4) structure has been described in some brown algae from the order Fucales. CONCLUSIONS The data provide a global snapshot of the cell wall architecture in brown algae, and contribute to the understanding of the structure-function relationships of the main cell wall components. Enzymatic cross-linking of alginates by phenols may regulate the strengthening of the wall, and sulfated polysaccharides may play a key role in the adaptation to osmotic stress. The emergence and evolution of ECM components is further discussed in relation to the evolution of multicellularity in brown algae.
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Affiliation(s)
- Estelle Deniaud-Bouët
- Sorbonne Universités, UPMC Université Paris 06, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France CNRS, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Nelly Kervarec
- Service RMN-RPE, UFR Sciences et Techniques, Université de Bretagne Occidentale (UBO), Avenue Le Gorgeu, 29200 Brest, France
| | - Gurvan Michel
- Sorbonne Universités, UPMC Université Paris 06, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France CNRS, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Thierry Tonon
- Sorbonne Universités, UPMC Université Paris 06, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France CNRS, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Bernard Kloareg
- Sorbonne Universités, UPMC Université Paris 06, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France CNRS, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
| | - Cécile Hervé
- Sorbonne Universités, UPMC Université Paris 06, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France CNRS, UMR 8227 Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, F-29688 Roscoff cedex, France
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25
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Connan S, Stengel DB. Impacts of ambient salinity and copper on brown algae: 2. Interactive effects on phenolic pool and assessment of metal binding capacity of phlorotannin. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 104:1-13. [PMID: 21543047 DOI: 10.1016/j.aquatox.2011.03.016] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Revised: 03/21/2011] [Accepted: 03/23/2011] [Indexed: 05/30/2023]
Abstract
The aim of this study was to establish in laboratory experiments a quantitative link between phenolic pool (production, composition and exudation) in Ascophyllum nodosum and Fucus vesiculosus and their potential to bind metals. Additionally, the copper binding capacity of purified phlorotannin was investigated. A reduction in salinity decreased total phenolic contents, altered phenolic composition by increasing proportion of cell-wall phenolics, and also increased phenolic exudation of the two seaweed species. After 15 days at a salinity of 5, the inhibition of photosynthesis observed previously for A. nodosum coincided with the high exudation of phenolic compounds into the surrounding water of the seaweed tips which resulted in a significant reduction of phenolic contents. Increased copper concentration also reduced total phenolic contents, changed phenolic composition (increase in proportion and level of cell-wall phenolics), and positively affected phenolic exudation of A. nodosum and F. vesiculosus. A decrease in salinity enhanced the copper toxicity and caused the earlier impact on the physiology of seaweed tips. An involvement of phlorotannins in copper binding is also demonstrated; purified phlorotannins from A. nodosum collected from a site with little anthropogenic activity contained all four metals tested. When placed in copper-enriched water, as for the seaweed material, copper contents of the phenolics increased, zinc and cadmium contents decreased, but no change in chromium content was observed. The use of cell-wall phenolic content as biomarker of copper contamination seems promising but needs further investigation.
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Affiliation(s)
- Solène Connan
- Botany and Plant Science, School of Natural Sciences, Environmental Change Institute and Martin Ryan Institute, National University of Ireland Galway, Galway, Ireland.
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Effects of Calcium and Vanadium Ions on the Epoxidation of Cyclohexene with H<SUB>2</SUB>O<SUB>2</SUB> Catalyzed by Vanadium Bromoperoxidase. CHINESE JOURNAL OF CATALYSIS 2010. [DOI: 10.3724/sp.j.1088.2010.00438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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La Barre S, Potin P, Leblanc C, Delage L. The halogenated metabolism of brown algae (Phaeophyta), its biological importance and its environmental significance. Mar Drugs 2010; 8:988-1010. [PMID: 20479964 PMCID: PMC2866472 DOI: 10.3390/md8040988] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2010] [Revised: 03/13/2010] [Accepted: 03/25/2010] [Indexed: 11/16/2022] Open
Abstract
Brown algae represent a major component of littoral and sublittoral zones in temperate and subtropical ecosystems. An essential adaptive feature of this independent eukaryotic lineage is the ability to couple oxidative reactions resulting from exposure to sunlight and air with the halogenations of various substrates, thereby addressing various biotic and abiotic stresses i.e., defense against predators, tissue repair, holdfast adhesion, and protection against reactive species generated by oxidative processes. Whereas marine organisms mainly make use of bromine to increase the biological activity of secondary metabolites, some orders of brown algae such as Laminariales have also developed a striking capability to accumulate and to use iodine in physiological adaptations to stress. We review selected aspects of the halogenated metabolism of macrophytic brown algae in the light of the most recent results, which point toward novel functions for iodide accumulation in kelps and the importance of bromination in cell wall modifications and adhesion properties of brown algal propagules. The importance of halogen speciation processes ranges from microbiology to biogeochemistry, through enzymology, cellular biology and ecotoxicology.
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Affiliation(s)
- Stéphane La Barre
- Université Pierre et Marie Curie-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France; E-Mails:
(P.P.);
(C.L.);
(L.D.)
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France
| | - Philippe Potin
- Université Pierre et Marie Curie-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France; E-Mails:
(P.P.);
(C.L.);
(L.D.)
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France
| | - Catherine Leblanc
- Université Pierre et Marie Curie-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France; E-Mails:
(P.P.);
(C.L.);
(L.D.)
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France
| | - Ludovic Delage
- Université Pierre et Marie Curie-Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France; E-Mails:
(P.P.);
(C.L.);
(L.D.)
- CNRS, UMR 7139 Végétaux marins et Biomolécules, Station Biologique F-29682, Roscoff, France
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Cinelli LP, Andrade L, Valente AP, Mourão PAS. Sulfated alpha-L-galactans from the sea urchin ovary: selective 6-desulfation as eggs are spawned. Glycobiology 2010; 20:702-9. [PMID: 20147451 DOI: 10.1093/glycob/cwq017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The sea urchin eggs are surrounded by a jelly coat, which contains sulfated polysaccharides with unique structures. These molecules are responsible for inducing the species-specific acrosome reaction, an obligatory event for the binding of sperm and fusion with the egg. The mechanism of biosynthesis of these sulfated polysaccharides is virtually unknown. The egg jelly of the sea urchin Echinometra lucunter contains a simple 2-sulfated, 3-linked alpha-L-galactan. Here, we pulse labeled the sea urchin ovary in vitro with (35)S-sulfate to follow the biosynthesis of the sulfated alpha-L-galactan. We found that the ovary contains a 2,6-disulfated, 3-linked alpha-L-galactan, which incorporates (35)S-sulfate more avidly than the 2-sulfated isoform. The 2,6-disulfated alpha-L-galactan was purified by anion exchange chromatography, analyzed by electrophoresis and characterized by 1D and 2D nuclear magnetic resonance spectra. We also investigated the location of the sulfated polysaccharides on the oocytes using histochemical procedures. The stain revealed high amounts of sulfated polysaccharide in mature oocytes and accessory cells. The amount of intracellular sulfated polysaccharides decreased as oocytes are spawned. We speculate that 2,6-disulfated galactan is initially synthesized in the ovary and that 6-sulfate ester is removed when the polysaccharide is secreted into the egg jelly. Similar events related to remodeling of sulfated polysaccharides have been reported in other biological systems.
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