Released and capsular polysaccharides of Oscillatoriaceae (Cyanophyceae, Cyanobacteria)

Gloaguen, Vincent; Morvan, Henri; Hoffmann, Lucien

doi:10.1127/algol_stud/78/1995/53

Cited by 22 publications

(28 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The few available data seem to support this hypothesis: indeed, at least for A. £os-aquae [59,66], some Phormidium strains [53] and C. capsulata [63], the capsular and the released polysaccharides showed the same monosaccharide composition; in the case of C. capsulata, the two polymers also showed quite similar molecular masses (our unpublished results). With regard to the morphological changes that may occur during polysaccharide release, it was observed that, in C. capsulata [63] and Cyanothece 16Som2 [48], the thickness of the capsule surrounding the cells remained almost constant throughout growth phases and under all the culture conditions tested, in spite of the large amounts of polysaccharide released into the culture medium.…”

Section: Exopolysaccharide Release and Factors A¡ecting Polymer Produmentioning

confidence: 74%

See 1 more Smart Citation

Exocellular polysaccharides from cyanobacteria and their possible applications

Philippis¹

1998

FEMS Microbiology Reviews

331

216

View full text Add to dashboard Cite

Cyanobacteria are photoautotrophic prokaryotes which include a large variety of species of widespread occurrence and with diverse morphological, physiological and biochemical properties. Many cyanobacteria are known to be able to synthesise outermost slimy investments and to release polysaccharidic material into the culture medium during cell growth. These released polysaccharides (RPSs), being easily recoverable from the culture medium, are attracting much interest in view of their possible uses in several industrial applications. In this paper, an overview of the current knowledge on both RPS-producing cyanobacterial strains (including the possible roles of the exopolysaccharides) and chemical characteristics of the cyanobacterial RPSs is given, with particular emphasis on RPS properties and possible industrial applications. On the whole, cyanobacterial RPSs are characterised by a great variety in both number (from two to 10) and type of constitutive monosaccharides (various arrangements of acidic and neutral sugars). Most polymers show an anionic nature due to the presence of uronic acids and/or other charged groups such as pyruvyl or sulfate. Polypeptide moieties as well as acetyl substituents have also sometimes been found, causing additional structural complexity. All the cyanobacterial RPSs so far tested showed a pseudoplastic behaviour, but with marked differences in both viscosity values and shear thinning. In terms of RPS production, the responses of cyanobacteria to changes of culture conditions appear strain-dependent. RPS productivities shown by some cyanobacteria are well comparable with those reported for other photosynthetic microorganisms proposed for polysaccharide production, but very low in comparison with those of heterotrophic microorganisms. Nevertheless, cyanobacteria may be regarded as a very abundant source of structurally diverse polysaccharides, some of which may possess unique properties for special applications, not fulfilled by the polymers currently available. However, much work has still to be done to bridge the wide gap existing between data on the biology of the RPS-producer strains and information concerning technological and other useful properties of the cyanobacterial RPS. z

show abstract

Section: Exopolysaccharide Release and Factors A¡ecting Polymer Produmentioning

confidence: 74%

“…In a few cases, the presence of additional types of monosaccharides (i.e. methyl sugars and/or amino sugars) has been reported [40,46,49,51,53,55]. However, a precise iden-ti¢cation of these sugars concerns only the RPSs produced by one Chroococcus [46], one Gloeothece [49] and two Synechococcus [51] strains.…”

Section: Cyanobacterial Exopolysaccharidesmentioning

confidence: 99%

Exocellular polysaccharides from cyanobacteria and their possible applications

Philippis¹

1998

FEMS Microbiology Reviews

331

216

View full text Add to dashboard Cite

show abstract

“…While the role of TEP in regulating the fate of organic matter has been extensively addressed (see above references), the factors controlling the build-up of the TEP pool are not as clearly understood. Cyanobacterial blooms may serve as a significant source for the TEP pool via the production of large amounts of extracellular polymeric substances, consisting mainly of polysaccharides (Bertocchi et al, 1990;Gloaguen et al, 1995), which are known TEP precursors (Passow, 2000). Extracellular release and the production of TEP precursors may also increase under conditions of nutrient limitation coupled with sufficient light and carbon (Passow, 2002), leading to the accumulation of the TEP pool during bloom termination.…”

Section: Discussionmentioning

confidence: 99%

Coupling between autocatalytic cell death and transparent exopolymeric particle production in the marine cyanobacterium Trichodesmium

Berman‐Frank

Rosenberg

Levitan

et al. 2007

Environmental Microbiology

129

121

View full text Add to dashboard Cite

Extracellular polysaccharide aggregates, operationally defined as transparent exopolymeric particles (TEP), are recognized as an important conduit for carbon recycling and export in aquatic systems. Yet, the factors controlling the build-up of the TEP pool are not well characterized. Here we show that increased TEP production by Trichodesmium, an oceanic bloom-forming nitrogen-fixing (diazotrophic) cyanobacterium, is coupled with autocatalytic programmed cell death (PCD) process. We demonstrate that PCD induction, in both laboratory cultures and natural populations, is characterized by high caspase-like activity, correlates with enhanced TEP production, and occurs under iron and phosphorus starvation, as well as under high irradiance and oxidative stress. Enhanced TEP production was not observed in actively growing populations. We provide further evidence that iron is a key trigger for the induction of PCD. We demonstrate, for the first time, the concomitant enhanced build-up of the TEP pool when Trichodesmium is Fe-stressed. These results suggest a functional linkage between activation of caspases and PCD in Trichodesmium and regulation of vertical carbon and nitrogen fluxes. We hypothesize that modulation of TEP formation and its qualities by different mortality pathways could regulate the fate of phytoplankton blooms and particulate organic matter in aquatic ecosystems.

show abstract

“…methyl sugars and/ or amino sugars) such as N-acetyl glucosamine, 2,3-O-methyl rhamnose, 3-O-methyl rhamnose, 4-O-methyl rhamnose and 3-O-methyl glucose have been reported (Hu et al, 2003a). The monosaccharide most frequently found at the highest concentration in cyanobacterial EPS is glucose, although there are polymers where other sugars, such as xylose, arabinose, galactose or fucose, are present at higher concentrations than glucose (Tease et al, 1991;Bender et al, 1994;Gloaguen et al, 1995;Fischer et al, 1997;De Philippis & Vincenzini, 1998Parikh & Madamwar, 2006). The high number of different monosaccharides found in cyanobacterial EPS and the consequential variety of linkage types is usually considered a reason for the presence of complex repeating units, as well as for a broad range of possible structures and architectures of these macromolecules.…”

Section: Composition and Macromolecular Characteristics Of Cyanobactementioning

confidence: 99%

“…ATCC 51142 are composed of repeating units of six, four and three monosaccharides, respectively Huang et al, 2000;Shah et al, 2000;Volk et al, 2007). On the other hand, the structures proposed for the EPS produced by Mastigocladus laminosus and Cyanospira capsulata are far more complex, with repeating units of 15 and eight monosaccharides, respectively (Garozzo et al, 1995(Garozzo et al, , 1998Gloaguen et al, 1995Gloaguen et al, , 1999. For Spirulina platensis, no structure was proposed, but it was demonstrated that its EPS repeating unit contains at least 15 sugar residues (Filali Mouhim et al, 1993).…”

Section: Composition and Macromolecular Characteristics Of Cyanobactementioning

confidence: 99%

Complexity of cyanobacterial exopolysaccharides: composition, structures, inducing factors and putative genes involved in their biosynthesis and assembly

et al. 2009

View full text Add to dashboard Cite

Cyanobacterial extracellular polymeric substances (EPS) are mainly composed of high-molecular-mass heteropolysaccharides, with variable composition and roles according to the microorganism and the environmental conditions. The number of constituents - both saccharidic and nonsaccharidic - and the complexity of structures give rise to speculations on how intricate their biosynthetic pathways could be, and how many genes may be involved in their production. However, little is known regarding the cyanobacterial EPS biosynthetic pathways and regulating factors. This review organizes available information on cyanobacterial EPS, including their composition, function and factors affecting their synthesis, and from the in silico analysis of available cyanobacterial genome sequences, proposes a putative mechanism for their biosynthesis.

show abstract

Released and capsular polysaccharides of Oscillatoriaceae (Cyanophyceae, Cyanobacteria)

Cited by 22 publications

References 0 publications

Exocellular polysaccharides from cyanobacteria and their possible applications

Exocellular polysaccharides from cyanobacteria and their possible applications

Coupling between autocatalytic cell death and transparent exopolymeric particle production in the marine cyanobacterium Trichodesmium

Complexity of cyanobacterial exopolysaccharides: composition, structures, inducing factors and putative genes involved in their biosynthesis and assembly

Contact Info

Product

Resources

About