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Registros recuperados: 10
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Bioprospecting for Exopolysaccharides from Deep-Sea Hydrothermal Vent Bacteria: Relationship between Bacterial Diversity and Chemical Diversity ArchiMer
Delbarre-ladrat, Christine; Salas, Marcia Leyva; Sinquin, Corinne; Zykwinska, Agata; Colliec-jouault, Sylvia.
Many bacteria biosynthesize structurally diverse exopolysaccharides (EPS) and excrete them into their surrounding environment. The EPS functional features have found many applications in industries such as cosmetics and pharmaceutics. In particular, some EPS produced by marine bacteria are composed of uronic acids, neutral sugars, and N-acetylhexosamines, and may also bear some functional sulfate groups. This suggests that they can share common structural features with glycosaminoglycans (GAG) like the two EPS (HE800 and GY785) originating from the deep sea. In an attempt to discover new EPS that may be promising candidates as GAG-mimetics, fifty-one marine bacterial strains originating from deep-sea hydrothermal vents were screened. The analysis of the...
Tipo: Text Palavras-chave: Exopolysaccharides; GAG; Marine bacteria; Glycopolymers; Sulfate; Production.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00399/51090/51873.pdf
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Complete Genome Sequence of Lactococcus piscium CNCM I-4031, a Bioprotective Strain for Seafood Products ArchiMer
Marché, Laurent; Saraoui, Taous; Remenant, Benoit; Zagorec, Monique; Prévost, Hervé; Delbarre-ladrat, Christine; Leroi, Francoise; Pilet, Marie France.
Lactococcus piscium CNCM I-4031 is a psychotrophic foodborne lactic acid bacterium showing potential interest for the biopreservation of seafood products due to its inhibition properties toward pathogenic and spoilage bacteria. The analysis of its genome will provide a better understanding of the mechanisms of interaction between these bacteria.
Tipo: Text
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00369/47973/47998.pdf
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Deep-sea Hydrothermal Vent Bacteria as a Source of Glycosaminoglycan-Mimetic Exopolysaccharides ArchiMer
Zykwinska, Agata; Marchand, Laetitia; Bonnetot, Sandrine; Sinquin, Corinne; Colliec-jouault, Sylvia; Delbarre-ladrat, Christine.
Bacteria have developed a unique strategy to survive in extreme environmental conditions through the synthesis of an extracellular polymeric matrix conferring upon the cells a protective microenvironment. The main structural component of this complex network constitutes high-molecular weight hydrophilic macromolecules, namely exopolysaccharides (EPS). EPS composition with the presence of particular chemical features may closely be related to the specific conditions in which bacteria evolve. Deep-sea hydrothermal vent bacteria have already been shown to produce EPS rich in hexosamines and uronic acids, frequently bearing some sulfate groups. Such a particular composition ensures interesting functional properties, including biological activities mimicking...
Tipo: Text Palavras-chave: Exopolysaccharide; Glycosaminoglycan; Uronic acid; Hexosamine; Phylogenetic analysis.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00506/61756/65728.pdf
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Enzymatic depolymerization of the GY785 exopolysaccharide produced by the deep-sea hydrothermal bacterium Alteromonas infernus : structural study and enzyme activity assessment ArchiMer
Zykwinska, Agata; Berre, Ludivine Tripon-le; Sinquin, Corinne; Ropartz, David; Rogniaux, Helene; Colliec-jouault, Sylvia; Delbarre-ladrat, Christine.
Polysaccharides have attracted much attention due to their interesting physico-chemical and also biological properties that are explored in food, cosmetic and pharmaceutical industries. GY785 exopolysaccharide (EPS) presenting an unusual structure is secreted by the deep-sea hydrothermal bacterium, Alteromonas infernus. Low-molecular weight (LMW) derivatives obtained by chemical depolymerization of the native high molecular weight (HMW) EPS were previously shown to exhibit biological properties similar to glycosaminoglycans (GAG). In the present study, in order to generate well defined derivatives with a better control of the depolymerization, an enzymatic approach was applied for the first time. Various commercially available enzymes were firstly screened...
Tipo: Text Palavras-chave: Exopolysaccharide; Enzyme; Depolymerization; Oligosaccharide; Mass spectrometry.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00423/53458/54352.pdf
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Exopolysaccharides produced by marine bacteria and their applications as glycosaminoglycan-like molecules ArchiMer
Delbarre-ladrat, Christine; Sinquin, Corinne; Lebellenger, Lou; Zykwinska, Agata; Colliec-jouault, Sylvia.
Although polysaccharides are ubiquitous and the most abundant renewable bio-components, their studies, covered by the glycochemistry and glycobiology fields, remain a challenge due to their high molecular diversity and complexity. Polysaccharides are industrially used in food products; human therapeutics fall into a more recent research field and pharmaceutical industry is looking for more and more molecules with enhanced activities. Glycosaminoglycans (GAGs) found in animal tissues play a critical role in cellular physiological and pathological processes as they bind many cellular components. Therefore, they present a great potential for the design and preparation of therapeutic drugs. On the other hand, microorganisms producing exopolysaccharides (EPS)...
Tipo: Text Palavras-chave: Marine-derivedpolysaccharide; Biodiversity; Biologicalactivity; Structure; Modification; GAG-mimetic; Biosynthesis.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00241/35250/33764.pdf
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Genome sequence of Vibrio diabolicus and identification of the exopolysaccharide HE800 biosynthesis locus ArchiMer
Goudenege, David; Boursicot, Vincent; Versigny, Typhaine; Bonnetot, Sandrine; Ratiskol, Jacqueline; Sinquin, Corinne; Lapointe, Gisele; Le Roux, Frederique; Delbarre-ladrat, Christine.
Vibrio diabolicus, a marine bacterium originating from deep-sea hydrothermal vents, produces the HE800 exopolysaccharide with high value for biotechnological purposes, especially for human health. Its genome was sequenced and analyzed; phylogenetic analysis using the core genome revealed V. diabolicus is close to another deep-sea Vibrio sp. (Ex25) within the Harveyi clade and Alginolyticus group. A genetic locus homologous to the syp cluster from Vibrio fischeri was demonstrated to be involved in the HE800 production. However, few genetic particularities suggest that the regulation of syp expression may be different in V. diabolicus. The presence of several types of glycosyltransferases within the locus indicates a capacity to generate diversity in the...
Tipo: Text Palavras-chave: Genome; Vibrio; Exopolysaccharide; Biosynthesis.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00241/35244/33892.pdf
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Heparin-like Entities from Marine Organisms ArchiMer
Colliec-jouault, Sylvia; Bavington, C.; Delbarre-ladrat, Christine.
Polysaccharides are ubiquitous in animals and plant cells where they play a significant role in a number of physiological situations e.g. hydration, mechanical properties of cell walls and ionic regulation. This review concentrates on heparin-like entities from marine procaryotes and eukaryotes. Carbohydrates from marine prokaryotes offer a significant structural chemodiversity with novel material and biological properties. Cyanobacteria are Gram-negative photosynthetic prokaryotes considered as a rich source of novel molecules, and marine bacteria are a rich source of polysaccharides with novel structures, which may be a good starting point from which to synthesise heparinoid molecules. For example, some sulphated polysaccharides have been isolated from...
Tipo: Text
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00127/23874/21850.pdf
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Marine Polysaccharides: A Source of Bioactive Molecules for Cell Therapy and Tissue Engineering ArchiMer
Senni, Karim; Pereira, Jessica; Gueniche, Farida; Delbarre-ladrat, Christine; Sinquin, Corinne; Ratiskol, Jacqueline; Godeau, Gaston; Fischer, Anne-marie; Helley, Dominique; Colliec-jouault, Sylvia.
The therapeutic potential of natural bioactive compounds such as polysaccharides, especially glycosaminoglycans, is now well documented, and this activity combined with natural biodiversity will allow the development of a new generation of therapeutics. Advances in our understanding of the biosynthesis, structure and function of complex glycans from mammalian origin have shown the crucial role of this class of molecules to modulate disease processes and the importance of a deeper knowledge of structure-activity relationships. Marine environment offers a tremendous biodiversity and original polysaccharides have been discovered presenting a great chemical diversity that is largely species specific. The study of the biological properties of the...
Tipo: Text Palavras-chave: Marine bacteria; Marine algae; Exopolysaccharides; Sulfated polysaccharides; Structure; Chemical modification; Biological activity; Blue biotechnology; Cell therapy; Tissue engineering.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00048/15894/13316.pdf
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Purification of the exopolysaccharide produced by Alteromonas infernus: identification of endotoxins and effective process to remove them ArchiMer
Grivaud-le Du, Alicia; Zykwinska, Agata; Sinquin, Corinne; Ratiskol, Jacqueline; Weiss, Pierre; Vinatier, Claire; Guicheux, Jerome; Delbarre-ladrat, Christine; Colliec-jouault, Sylvia.
Alteromonas infernus bacterium isolated from deep-sea hydrothermal vents can produce by fermentation a high molecular weight exopolysaccharide (EPS) called GY785. This EPS described as a new source of glycosaminoglycan-like molecule presents a great potential for pharmaceutical and biotechnological applications. However, this unusual EPS is secreted by a Gram-negative bacterium and can be therefore contaminated by endotoxins, in particular the lipopolysaccharides (LPS). Biochemical and chemical analyses of the LPS extracted from A. infernus membranes have shown the lack of the typical LPS architecture since 3-deoxy-d-manno-oct-2-ulopyranosonic acid (Kdo), glucosamine (GlcN), and phosphorylated monosaccharides were not present. Unlike for other...
Tipo: Text Palavras-chave: Marine Alteromonas infernus; Bacterial exopolysaccharide; Endotoxin; Characterization; Purification; Fermentation; Process.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00397/50818/51601.pdf
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Screening of enzymatic activities for the depolymerisation of the marine bacterial exopolysaccharide HE800 ArchiMer
Rigouin, Coraline; Delbarre-ladrat, Christine; Ratiskol, Jacqueline; Sinquin, Corinne; Colliec-jouault, Sylvia; Dion, Michel.
Tipo: Text Palavras-chave: Polysaccharide; Enzymatic depolymerisation; Low-molecular-weight derivatives; Enterococcus faecalis; Endo-N-acetyl-galactosaminidase.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20907/18741.pdf
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