Curdlan

Yotsuzuka, Fumio

doi:10.1201/9780203904220.ch37

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…A relatively newer finding has discovered an insoluble fraction of β‐glucan called curdlan, which derives this name owing to its property to get “curdled down” when heated. Curdlan, which possesses various functional properties (Jezequel 1998), is basically a β‐1,3 glucan and consists of D‐glucose monomers linked by β‐glucosidic bonds at C 1 and C 3 to form a linear chain with no branching (Yotsuzuka 2001) (Figure 5). The uses of curdlan are confined to conventional food product preparations like to processed meat and poultry products, batters and breadings, noodles, and surimi‐based seafood, freeze‐dried foods with improved rehydration time and texture, and various sauces and gravies.…”

Section: Oat Fiber (β‐Glucans)mentioning

confidence: 99%

Soluble Dietary Fiber

Chawla

Patil

2010

Comp Rev Food Sci Food Safe

249

128

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Section: Oat Fiber (β‐Glucans)mentioning

confidence: 99%

Soluble Dietary Fiber

Chawla

Patil

2010

Comp Rev Food Sci Food Safe

249

128

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Novel mixed-linkage β-glucan activated by c-di-GMP in Sinorhizobium meliloti

Pérez-Mendoza

Rodrı́guez-Carvajal

Romero-Jiménez

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

109

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An artificial increase of cyclic diguanylate (c-di-GMP) levels in Sinorhizobium meliloti 8530, a bacterium that does not carry known cellulose synthesis genes, leads to overproduction of a substance that binds the dyes Congo red and calcofluor. Sugar composition and methylation analyses and NMR studies identified this compound as a linear mixed-linkage (1→3)(1→4)-β-D-glucan (ML β-glucan), not previously described in bacteria but resembling ML β-glucans found in plants and lichens. This unique polymer is hydrolyzed by the specific endoglucanase lichenase, but, unlike lichenan and barley glucan, it generates a disaccharidic →4)-β-DGlcp-(1→3)-β-D-Glcp-(1→ repeating unit. A two-gene operon bgsBA required for production of this ML β-glucan is conserved among several genera within the order Rhizobiales, where bgsA encodes a glycosyl transferase with domain resemblance and phylogenetic relationship to curdlan synthases and to bacterial cellulose synthases. ML β-glucan synthesis is subjected to both transcriptional and posttranslational regulation. bgsBA transcription is dependent on the exopolysaccharide/quorum sensing ExpR/SinI regulatory system, and posttranslational regulation seems to involve allosteric activation of the ML β-glucan synthase BgsA by c-di-GMP binding to its C-terminal domain. To our knowledge, this is the first report on a linear mixed-linkage (1→3)(1→4)-β-glucan produced by a bacterium. The S. meliloti ML β-glucan participates in bacterial aggregation and biofilm formation and is required for efficient attachment to the roots of a host plant, resembling the biological role of cellulose in other bacteria.exopolysaccharides | cyclic diguanylate | plant-microbe interactions

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Curdlan

Cited by 2 publications

References 15 publications

Soluble Dietary Fiber

Soluble Dietary Fiber

Novel mixed-linkage β-glucan activated by c-di-GMP in Sinorhizobium meliloti

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