1
|
Li DW, Tan JZ, Li ZF, Ou LJ. Membrane lipid remodeling and autophagy to cope with phosphorus deficiency in the dinoflagellate Prorocentrum shikokuense. CHEMOSPHERE 2024; 349:140844. [PMID: 38042419 DOI: 10.1016/j.chemosphere.2023.140844] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 11/26/2023] [Accepted: 11/27/2023] [Indexed: 12/04/2023]
Abstract
Dinoflagellates, which are responsible for more than 80% of harmful algal blooms in coastal waters, are competitive in low-phosphate environments. However, the specific acclimated phosphorus strategies to adapt to phosphorus deficiency in dinoflagellates, particularly through intracellular phosphorus metabolism, remain largely unknown. Comprehensive physiological, biochemical, and transcriptomic analyses were conducted to investigate intracellular phosphorus modulation in a model dinoflagellate, Prorocentrum shikokuense, with a specific focus on membrane lipid remodeling and autophagy in response to phosphorus deficiency. Under phosphorus deficiency, P. shikokuense exhibited a preference to spare phospholipids with nonphospholipids. The major phospholipid classes of phosphatidylcholine and phosphatidylethanolamine decreased in content, whereas the betaine lipid class of diacylglyceryl carboxyhydroxymethylcholine increased in content. Furthermore, under phosphorus deficiency, P. shikokuense induced autophagy as a mechanism to conserve and recycle cellular phosphorus resources. The present study highlights the effective modulation of intracellular phosphorus in P. shikokuense through membrane phospholipid remodeling and autophagy and contributes to a comprehensive understanding of the acclimation strategies to low-phosphorus conditions in dinoflagellates.
Collapse
Affiliation(s)
- Da-Wei Li
- College of Life Science and Technology, and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Jin-Zhou Tan
- College of Life Science and Technology, and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Zhuo-Fan Li
- College of Life Science and Technology, and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Lin-Jian Ou
- College of Life Science and Technology, and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China.
| |
Collapse
|
2
|
Huang XL, Zhuang YQ, Xiong YY, Li DW, Ou LJ. Efficient modulation of cellular phosphorus components in response to phosphorus deficiency in the dinoflagellate Karenia mikimotoi. Appl Environ Microbiol 2023; 89:e0086723. [PMID: 37850723 PMCID: PMC10686090 DOI: 10.1128/aem.00867-23] [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: 05/23/2023] [Accepted: 08/29/2023] [Indexed: 10/19/2023] Open
Abstract
IMPORTANCE Dinoflagellates are the most common phytoplankton group and account for more than 75% of harmful algal blooms in coastal waters. In recent decades, dinoflagellates seem to prevail in phosphate-depleted waters. However, the underlying acclimation mechanisms and competitive strategies of dinoflagellates in response to phosphorus deficiency are poorly understood, especially in terms of intracellular phosphorus modulation and recycling. Here, we focused on the response of intracellular phosphorus metabolism to phosphorus deficiency in the model dinoflagellate Karenia mikimotoi. Our work reveals the strong capability of K. mikimotoi to efficiently regulate intracellular phosphorus resources, particularly through membrane phospholipid remodeling and miRNA regulation of energy metabolism. Our research improved the understanding of intracellular phosphorus metabolism in marine phytoplankton and underscored the advantageous strategies of dinoflagellates in the efficient modulation of internal phosphorus resources to maintain active physiological activity and growth under unsuitable phosphorus conditions, which help them outcompete other species in coastal phosphate-depleted environments.
Collapse
Affiliation(s)
- Xue-Ling Huang
- College of Life Science and Technology and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Yan-Qing Zhuang
- College of Life Science and Technology and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Yue-Yue Xiong
- College of Life Science and Technology and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Da-Wei Li
- College of Life Science and Technology and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
| | - Lin-Jian Ou
- College of Life Science and Technology and Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institute, Jinan University, Guangzhou, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
| |
Collapse
|
3
|
Yan L, Liu Y. Mechanistic Insights into the Anaerobic Degradation of Globally Abundant Dihydroxypropanesulfonate Catalyzed by the DHPS-Sulfolyase (HpsG). J Chem Inf Model 2022; 62:2880-2888. [PMID: 35583151 DOI: 10.1021/acs.jcim.2c00174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
2(S)-Dihydroxypropanesulfonate (DHPS) is the main abundant organosulfonate in the biosphere generated by the microbial degradation of the abundant organosulfur species 6-deoxy-6-sulfo-d-glucopyranose (sulfoquinovose, SQ). Massive amounts of DHPS can also be produced by the highly abundant oceanic diatoms. The quantity of degradation DHPS is so large that it has become an important part of the earth's sulfur. The recently characterized O2-sensitive glycyl radical enzyme DHPS-sulfolyase HpsG in anaerobic bacteria was found to be capable of cleaving the C-S bond of DHPS under anaerobic conditions. However, the detailed degradation mechanism is still unclear. Here, on the basis of the crystal structure of HpsG, we constructed the computational model and performed QM/MM calculations to illuminate the anaerobic degradation mechanism of DHPS. Our calculations revealed that the degradation reaction follows an unusual radical-dependent mechanism that does not require a conserved Glu464 to deprotonate the C2 hydroxyl of substrate to promote the C-S cleavage; instead, after the first hydrogen abstraction triggered by the thiyl radical (Cys462), the C-S bond in 2(S)-dihydroxypropanesulfonate can directly collapse. Thus, conserved Glu464 mainly plays a role in stabilizing the substrate and reaction intermediate by forming a hydrogen bond. After the release of the sulfonic acid group from the protein environment, the deprotonated Glu464 spontaneously accepts a proton from the C2 hydroxyl of the substrate radical. Our findings clarified an unusual C-S cleavage mechanism involved in the DHPS degradation reaction catalyzed by GREs.
Collapse
Affiliation(s)
- Lijuan Yan
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| | - Yongjun Liu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| |
Collapse
|
4
|
Huang JJ, Cheung PCK. Cold stress treatment enhances production of metabolites and biodiesel feedstock in Porphyridium cruentum via adjustment of cell membrane fluidity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 780:146612. [PMID: 34030318 DOI: 10.1016/j.scitotenv.2021.146612] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/04/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Porphyridium cruentum, a cell-wall-free marine Rhodophyta microalga was cultured under a 5-day cold stress at 0 °C and 15 °C, after reaching the late logarithmic growth phase. Compared with the control at 25 °C, the cold stress treatment significantly (p < 0.05) increased the microalgal biomass (1.21-fold); the amounts of total polyunsaturated fatty acids (1.22-fold); individual fatty acids including linoleic acid (1.50-fold) and eicosatrienoic acid (1.85-fold), and a major carotenoid zeaxanthin (1.53-fold). Furthermore, production of biodiesel feedstock including total C16 + C18 fatty acids was significantly enhanced (p < 0.05) by 1.18-fold after the cold stress treatment. Principal component analysis further indicated that the biosynthetic pathways of fatty acids and carotenoids in this microalga were correlated with the cold stress treatment. These results suggested that P. cruentum had adjusted its cellular membrane fluidity via an 'arm-raising and screw-bolt fastening' mechanism mediated by the synergistic roles of cis-unsaturated fatty acids and carotenoids. The insight obtained from the responses to cold stress in P. cruentum could be a novel technological approach to enhance the production of microalgal metabolites and biodiesel feedstock.
Collapse
Affiliation(s)
- Jim Junhui Huang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, No. 100, Waihuan West Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, Guangdong Province, People's Republic of China; Food and Nutritional Sciences Programme, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong S.A.R., People's Republic of China; Environmental Research Institute, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Republic of Singapore; Marine Biology Institute, Shantou University, Shantou 515063, Guangdong Province, People's Republic of China
| | - Peter Chi Keung Cheung
- Food and Nutritional Sciences Programme, School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong S.A.R., People's Republic of China.
| |
Collapse
|
5
|
Gémin MP, Bertrand S, Séchet V, Amzil Z, Réveillon D. Combined effects of temperature and light intensity on growth, metabolome and ovatoxin content of a Mediterranean Ostreopsis cf. ovata strain. HARMFUL ALGAE 2021; 106:102060. [PMID: 34154782 DOI: 10.1016/j.hal.2021.102060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 05/18/2021] [Accepted: 05/22/2021] [Indexed: 06/13/2023]
Abstract
Ostreopsis cf. ovata is a benthic and ovatoxin-producing dinoflagellate proliferating yearly along the Mediterranean coasts where blooms have been related to human illness and unusual mortality of marine organisms. The spreading of O. cf. ovata in this temperate area has been linked to global changes and its consequences such as the increase of temperature or light intensities. In the present study, an experimental design using batch cultures of pre-acclimated cells of a strain of O. cf. ovata isolated from Villefranche-sur-Mer (NW Mediterranean Sea, France), was implemented to investigate the combined effect of temperature (23, 27 and 30 °C) and light intensity (200, 400 and 600 µmol m-2s-1) on the growth, metabolome and OVTX content. Both light intensity and temperature affected the growth as significantly higher growth rates were obtained under 400 and 600 µmol m-2s-1 while the maximum values were obtained at 27 °C (0.48 d-1). Metabolomic analyses highlighted a clear effect only for temperature that may correspond to two different strategies of acclimation to suboptimal temperatures. Significant features (such as carotenoid and lipids) modified by the temperature and/or light conditions were annotated. Only temperature induced a significant change of OVTX content with higher values measured at the lowest temperature of 23 °C (29 - 36 pg cell-1). In a context of global changes, these results obtained after acclimation suggest that the increase of temperature might favor the proliferation of less toxic cells. However, in the light of the intraspecific variability of O. cf. ovata, further studies will be necessary to test this hypothesis. This study also highlighted the lack of knowledge about the metabolome composition of such non-model organisms that impairs data interpretation. There is a need to study more deeply the metabolome of toxic dinoflagellates to better understand how they can acclimate to a changing environment.
Collapse
Affiliation(s)
| | - Samuel Bertrand
- Faculté de Pharmacie, Université de Nantes, EA 2160-Mer Molécules Santé, F-44035 Nantes, France; ThalassOMICS Metabolomics Facility, Plateforme Corsaire, Biogenouest, 44035 Nantes, France.
| | - Véronique Séchet
- IFREMER, DYNECO, Phycotoxins Laboratory, F-44000 Nantes, France.
| | - Zouher Amzil
- IFREMER, DYNECO, Phycotoxins Laboratory, F-44000 Nantes, France.
| | - Damien Réveillon
- IFREMER, DYNECO, Phycotoxins Laboratory, F-44000 Nantes, France.
| |
Collapse
|
6
|
Moreira AS, da Costa E, Melo T, Sulpice R, Cardoso SM, Pitarma B, Pereira R, Abreu MH, Domingues P, Calado R, Domingues MR. Seasonal plasticity of the polar lipidome of Ulva rigida cultivated in a sustainable integrated multi-trophic aquaculture. ALGAL RES 2020. [DOI: 10.1016/j.algal.2020.101958] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
7
|
Cruaud P, Vigneron A, Fradette MS, Dorea CC, Culley AI, Rodriguez MJ, Charette SJ. Annual Protist Community Dynamics in a Freshwater Ecosystem Undergoing Contrasted Climatic Conditions: The Saint-Charles River (Canada). Front Microbiol 2019; 10:2359. [PMID: 31681222 PMCID: PMC6805768 DOI: 10.3389/fmicb.2019.02359] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 09/27/2019] [Indexed: 11/23/2022] Open
Abstract
Protists are key stone components of aquatic ecosystems, sustaining primary productivity and aquatic food webs. However, their diversity, ecology and structuring factors shaping their temporal distribution remain strongly misunderstood in freshwaters. Using high-throughput sequencing on water samples collected over 16 different months (including two summer and two winter periods), combined with geochemical measurements and climate monitoring, we comprehensively determined the pico- and nanoeukaryotic community composition and dynamics in a Canadian river undergoing prolonged ice-cover winters. Our analysis revealed a large protist diversity in this fluctuating ecosystem and clear seasonal patterns demonstrating a direct and/or indirect selective role of abiotic factors, such as water temperature or nitrogen concentrations, in structuring the eukaryotic microbial community. Nonetheless, our results also revealed that primary productivity, predatory as well as parasitism lifestyles, inferred from fine phylogenetic placements, remained potentially present over the annual cycle, despite the large seasonal fluctuations and the remodeling of the community composition under ice. In addition, potential interplays with the bacterial community composition were identified supporting a possible contribution of the bacterial community to the temporal dynamics of the protist community structure. Our results illustrate the complexity of the eukaryotic microbial community and provide a substantive and useful dataset to better understand the global freshwater ecosystem functioning.
Collapse
Affiliation(s)
- Perrine Cruaud
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec City, QC, Canada.,Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, QC, Canada.,CRAD, Université Laval, Québec City, QC, Canada
| | - Adrien Vigneron
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec City, QC, Canada.,Centre D'Études Nordiques, Université Laval, Québec City, QC, Canada.,Département de Biologie, Université Laval, Québec City, QC, Canada
| | - Marie-Stéphanie Fradette
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec City, QC, Canada.,Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, QC, Canada.,CRAD, Université Laval, Québec City, QC, Canada
| | - Caetano C Dorea
- Department of Civil Engineering, University of Victoria, Victoria, BC, Canada
| | - Alexander I Culley
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec City, QC, Canada.,Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, QC, Canada.,Groupe de Recherche en Ecologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec City, QC, Canada
| | - Manuel J Rodriguez
- CRAD, Université Laval, Québec City, QC, Canada.,École Supérieure D'aménagement du Territoire et de Développement Régional (ESAD), Université Laval, Québec City, QC, Canada
| | - Steve J Charette
- Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec City, QC, Canada.,Département de Biochimie, de Microbiologie et de Bio-Informatique, Faculté des Sciences et de Génie, Université Laval, Québec City, QC, Canada.,Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Québec City, QC, Canada
| |
Collapse
|
8
|
Obertegger U, Pindo M, Flaim G. Multifaceted aspects of synchrony between freshwater prokaryotes and protists. Mol Ecol 2019; 28:4500-4512. [DOI: 10.1111/mec.15228] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 07/29/2019] [Accepted: 08/12/2019] [Indexed: 11/27/2022]
Affiliation(s)
- Ulrike Obertegger
- Research and Innovation Centre Fondazione Edmund Mach San Michele all'Adige Italy
| | - Massimo Pindo
- Research and Innovation Centre Fondazione Edmund Mach San Michele all'Adige Italy
| | - Giovanna Flaim
- Research and Innovation Centre Fondazione Edmund Mach San Michele all'Adige Italy
| |
Collapse
|
9
|
Li-Beisson Y, Thelen JJ, Fedosejevs E, Harwood JL. The lipid biochemistry of eukaryotic algae. Prog Lipid Res 2019; 74:31-68. [PMID: 30703388 DOI: 10.1016/j.plipres.2019.01.003] [Citation(s) in RCA: 162] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Revised: 01/22/2019] [Accepted: 01/23/2019] [Indexed: 02/06/2023]
Abstract
Algal lipid metabolism fascinates both scientists and entrepreneurs due to the large diversity of fatty acyl structures that algae produce. Algae have therefore long been studied as sources of genes for novel fatty acids; and, due to their superior biomass productivity, algae are also considered a potential feedstock for biofuels. However, a major issue in a commercially viable "algal oil-to-biofuel" industry is the high production cost, because most algal species only produce large amounts of oils after being exposed to stress conditions. Recent studies have therefore focused on the identification of factors involved in TAG metabolism, on the subcellular organization of lipid pathways, and on interactions between organelles. This has been accompanied by the development of genetic/genomic and synthetic biological tools not only for the reference green alga Chlamydomonas reinhardtii but also for Nannochloropsis spp. and Phaeodactylum tricornutum. Advances in our understanding of enzymes and regulatory proteins of acyl lipid biosynthesis and turnover are described herein with a focus on carbon and energetic aspects. We also summarize how changes in environmental factors can impact lipid metabolism and describe present and potential industrial uses of algal lipids.
Collapse
Affiliation(s)
- Yonghua Li-Beisson
- Aix-Marseille Univ, CEA, CNRS, BIAM, UMR7265, CEA Cadarache, Saint-Paul-lez Durance F-13108, France.
| | - Jay J Thelen
- Department of Biochemistry, University of Missouri, Christopher S. Bond Life Sciences Center, Columbia, MO 65211, United States.
| | - Eric Fedosejevs
- Department of Biochemistry, University of Missouri, Christopher S. Bond Life Sciences Center, Columbia, MO 65211, United States.
| | - John L Harwood
- School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK.
| |
Collapse
|
10
|
Saber AA, Fučíková K, McManus HA, Guella G, Cantonati M. Novel green algal isolates from the Egyptian hyper-arid desert oases: a polyphasic approach with a description of Pharao desertorum gen. et sp. nov. (Chlorophyceae, Chlorophyta). JOURNAL OF PHYCOLOGY 2018; 54:342-357. [PMID: 29603234 DOI: 10.1111/jpy.12645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 02/20/2018] [Indexed: 06/08/2023]
Abstract
The biodiversity of terrestrial algae is still grossly understudied, and African deserts in particular are barely touched in this respect. Here, four coccoid green algae from oases in the Western Desert of Egypt were characterized using a combination of morphotaxonomic, ecological and 18S rDNA data, with additional carotenoid and lipid analyses for two of the strains. Three strains were identified as affiliated with known taxa: Mychonastes sp., Asterarcys sp. (first report of this genus from a desert soil), and Stichococcus cf. deasonii. The fourth strain is proposed to represent a new cryptic genus Pharao gen. nov., with the type species P. desertorum sp. nov. The new taxon is sister to the clade of uncharacterized North American desert strains of Radiococcaceae (Chlorophyceae, Chlorophyta). The pigment profile of P. desertorum gen. et sp. nov. revealed carotenoids and chlorophylls typical of green algae. Bioorganic analysis showed a complex lipidome based on phospho- (PC), galacto- (MGDG and DGDG), betaine- (DGTS), and sulfoquinovosyl- (SQDG) membrane lipids, besides significant amounts of storage neutral lipids such as diacyl- (DAG) and triacylglycerols (TAG). The presence of saturated alkyl chains within all the membrane lipid classes in P. desertorum and Asterarcys sp. appears to reflect the need to maintain membrane fluidity and viscosity. In summary, African deserts likely still harbor new taxa to be described, and lipidomic analyses of such taxa may provide clues about their ability to survive in the extremely harsh desert habitats.
Collapse
Affiliation(s)
- Abdullah A Saber
- Botany Department, Faculty of Science, Ain Shams University, Abbassia Square-11566, Cairo, Egypt
| | - Karolina Fučíková
- Department of Natural Sciences, Assumption College, 500 Salisbury St., Worcester, Massachusetts, USA
| | - Hilary A McManus
- Department of Biological and Environmental Sciences, Le Moyne College, Syracuse, New York, USA
| | - Graziano Guella
- Department of Physics, Bioorganic Chemistry Lab, University of Trento, Via Sommarive 14, Povo, 38123, Trentino, Italy
- CNR, Institute of Biophysics, Via alla Cascata 56/C, Povo, 38123, Trento, Italy
- Center for Agriculture, Food and the Environment, University of Trento, San Michele all'Adige, Italy
| | - Marco Cantonati
- Museo delle Scienze - MUSE, Limnology and Phycology Section, Corso del Lavoro e della Scienza 3, I-38123, Trento, Italy
| |
Collapse
|
11
|
Su J, Ye M, Lou Y, Yang Z, Sun T, Zhang R, Xu J, Zhou C, Yan X. Low-molecular-mass organic acid and lipid responses of Isochrysis galbana Parke to high temperature stress during the entire growth stage. ALGAL RES 2017. [DOI: 10.1016/j.algal.2017.06.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
12
|
Salem AB, Di Giuseppe G, Anesi A, Hammami S, Mighri Z, Guella G. Natural Products among Brown Algae: The Case of Cystoseira schiffneri Hamel (Sargassaceae, Phaeophyceae). Chem Biodivers 2017; 14. [PMID: 27981801 DOI: 10.1002/cbdv.201600333] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 12/14/2016] [Indexed: 11/08/2022]
Abstract
A chemotaxonomic study on the marine brown alga Cystoseira schiffneri collected from the Tunisian marine coast allowed us to identify kjellmanianone (1) and a new isololiolide derivative named schiffnerilolide (2). The structure elucidation and the assignment of relative configurations of the isolated natural products were based on advanced mass spectrometric and nuclear magnetic resonance techniques. This outcome suggested a close phylogenetic relationship of C. schiffneri with brown algae belonging to genus Sargassum C. Agardh. Molecular characterization using the nuclear small subunit rRNA (SSU rRNA) gene (18S) sequence as genetic marker was made. Pigment analysis showed a significant seasonal change of carotenoids, in particular of fucoxanthin and fucoxanthinol. Also galactolipids, the main constituents of the thylakoid membranes, showed remarkable seasonal changes.
Collapse
Affiliation(s)
- Abdelkader Ben Salem
- Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia
- Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy
| | - Graziano Di Giuseppe
- Unit of Zoology-Anthropology, Department of Biology, University of Pisa, 56126, Pisa, Italy
| | - Andrea Anesi
- Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy
| | - Saoussen Hammami
- Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia
| | - Zine Mighri
- Research Unit of Applied Chemistry and Environment (UR13ES63), Faculty of Sciences of Monastir, Avenue of the Environment, 5000 Monastir, University of Monastir, Tunisia
| | - Graziano Guella
- Laboratory of Bioorganic Chemistry, Department of Physics, University of Trento, 38123, Povo, Trento, Italy
- Biophysical Institute, CNR, 38123, Povo, Trento, Italy
- Centre for Agriculture, Food and Environment, University of Trento, via Mach 1, 38010, San Michele all Adige, Trento, Italy
| |
Collapse
|
13
|
Sulfoquinovose in the biosphere: occurrence, metabolism and functions. Biochem J 2017; 474:827-849. [DOI: 10.1042/bcj20160508] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 12/21/2016] [Accepted: 12/23/2016] [Indexed: 01/19/2023]
Abstract
The sulfonated carbohydrate sulfoquinovose (SQ) is produced in quantities estimated at some 10 billion tonnes annually and is thus a major participant in the global sulfur biocycle. SQ is produced by most photosynthetic organisms and incorporated into the sulfolipid sulfoquinovosyl diacylglycerol (SQDG), as well as within some archaea for incorporation into glycoprotein N-glycans. SQDG is found mainly within the thylakoid membranes of the chloroplast, where it appears to be important for membrane structure and function and for optimal activity of photosynthetic protein complexes. SQDG metabolism within the sulfur cycle involves complex biosynthetic and catabolic processes. SQDG biosynthesis is largely conserved within plants, algae and bacteria. On the other hand, two major sulfoglycolytic pathways have been discovered for SQDG degradation, the sulfo-Embden–Meyerhof–Parnas (sulfo-EMP) and sulfo-Entner–Doudoroff (sulfo-ED) pathways, which mirror the major steps in the glycolytic EMP and ED pathways. Sulfoglycolysis produces C3-sulfonates, which undergo biomineralization to inorganic sulfur species, completing the sulfur cycle. This review discusses the discovery and structural elucidation of SQDG and archaeal N-glycans, the occurrence, distribution, and speciation of SQDG, and metabolic pathways leading to the biosynthesis of SQDG and its catabolism through sulfoglycolytic and biomineralization pathways to inorganic sulfur.
Collapse
|