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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]
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 .
A glucan is a polysaccharide derived from D-glucose, [1] linked by glycosidic bonds. Glucans are noted in two forms: alpha glucans and beta glucans. Many beta-glucans are medically important. They represent a drug target for antifungal medications of the echinocandin class.
Zymosan is a beta-glucan with repeating glucose units connected by β-1,3-glycosidic linkages. It binds to TLR 2 and Dectin-1 . Zymosan is a ligand found on the surface of fungi, like yeast. [1] Zymosan is prepared from yeast cell walls and consists of protein-carbohydrate complexes.
β-1,3-glucanase, an enzyme in plants that breaks down β-1,3-glucans such as callose or curdlan; β-1,6 glucanase, an enzyme that breaks down β-1,6-glucans; Cellulase, an enzyme that perform the hydrolysis of 1,4-beta-D-glycosidic linkages in cellulose, lichenin and cereal β-D-glucans. [2] Xyloglucan-specific endo-beta-1,4-glucanase
Given that mixed-linkage glucan is a non-branched homopolymer of glucose, there is no side-chain synthesis, only the addition of glucose to the backbone in two linkages, β1-3 and β1-4. [10] Backbone synthesis is mediated by enzymes in cellulose synthase-like protein families F and H (CSLF and CSLH), specifically glucan synthase.
The Food and Drug Administration recommends consuming 3 grams of beta-glucan daily for LDL cholesterol reduction; this amount can be found in about 1½ servings of oats (or ¾ cup of dry oats).
Cereal β-glucans – including β-glucan from oat, barley and wheat – are linear polysaccharides joined by 1,3 and 1,4 carbon linkages. The majority of cereal β-glucan bonds consist of 3 or 4 beta-1,4 glycosidic bonds (trimers and tetramers) interconnected by 1,3 linkages.
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