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Glucan 1,6-α-glucosidase (EC 3.2.1.70, exo-1,6-β-glucosidase, glucodextrinase, glucan α-1,6-D-glucohydrolase) is an enzyme with systematic name glucan 6-α-D-glucohydrolase. [1] [2] [3] It catalyses the hydrolysis of (1→6)-α-D-glucosidic linkages in (1→6)-α-D-glucans and derived oligosaccharides. Hydrolysis is accompanied by inversion ...
The first representatives of main chain unhydrolysable linear polymers made up of levoglucosan units were synthesized in 1985 by anionic polymerization of 2,3-epoxy derivatives of levoglucosan (1,6;2,3-dianhydro-4-O-alkyl-β-D-mannopyranoses). [3] 2,3-Polymer. A wide range of unique monomers with different radical R can be synthesized. [4]
[7] [8] In general, β-1,3 linkages are created by 1,3-beta-glucan synthase, and β-1,4 linkages are created by cellulose synthase. The process leading to β-1,6 linkages is poorly understood: although genes important in the process have been identified, not much is known about what each of them do. [9]
Chitin-glucan complex (CGC) is a copolymer (polysaccharide) that makes up fungal cell walls, consisting of covalently-bonded chitin and branched 1,3/1,6-ß-D-glucan. CGCs are alkaline - insoluble . Different species of fungi have different structural compositions of chitin and β-glucan making up the CGCs in their cell walls. [ 1 ]
Endohydrolysis of (1→3)- or (1→4)-linkages in β-D-glucans when the glucose residue whose reducing group is involved in the linkage to be hydrolysed is itself substituted at C-3 Substrates include laminarin , lichenin and cereal D - glucans .
[3] Other uses for α-glucan have been developed based on its availability in bacteria. The accumulation of glycogen Neisseria polysacchera and other bacteria are able to use in α-glucan to catalyze glucose units to form α-1,4-glucan and liberating fructose in the process. To regulate carbohydrate metabolism, more resistant starch was necessary.
Mixed-linkage glucan (MLG), sometimes incorrectly referred to as beta-glucan, is a hemicellulosic polysaccharide consisting of β-D(1-3) and β-D(1-4) linked glucosyl residues. MLG is highly prevalent within the Poales , where it has important properties in the diet .
Curdlan is a neutral β-(1,3)-glucan, perhaps with a few intra- or interchain 1,6-linkages, produced as an exopolysaccharide by soil bacteria of the family Rhizobiaceae. [3] Four genes required for curdlan production have been identified in Agrobacterium sp. ATCC31749, which produces curdlan in extraordinary amounts, and Agrobacterium ...