Hemicellulosic plant cell-wall polysaccharide containing glucuronic acid and xylose as its main constituents. Has a b (1-4) -xylan backbone, with 4- O -methylglucuronic acid side-chains. Arabinose and acetyl side-chains may also be present. Major polysaccharide of angiosperm wood (hardwood).

Dictionary of molecular biology. 2004.

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  • hemicellulose — Class of plant cell wall polysaccharide that cannot be extracted from the wall by hot water or chelating agents, but can be extracted by aqueous alkali. Includes xylan, glucuronoxylan, arabinoxylan, arabinogalactan II, glucomannan, xyloglucan,… …   Dictionary of molecular biology

  • xylan — Plant cell wall polysaccharide containing a backbone of b (1 4) linked xylose residues. Side chains of 4 O methylglucuronic acid and arabinose are present in varying amounts (see glucuronoxylan and arabinoxylan), together with acetyl groups.… …   Dictionary of molecular biology

  • O-methyltransferase — An O methylated flavonoid (OMT) is a type of methyltransferase enzyme transferring a methyl group on a molecule. Examples are : Acetylserotonin O methyltransferase Apigenin 4 O methyltransferase Caffeate O methyltransferase Caffeoyl CoA O… …   Wikipedia

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