MetaCyc Compound Class: a (1→4)-β-D-xylan

Superclasses: all carbohydratesa carbohydratea glycana polysaccharidehemicellulosexylan

(1→4)-β-D-xylan is a polymer of β-D-xylopyranose residues connected by (1→4) links. It is found in the cell walls of plants and some green and red algae, and is the major constituent of hemicellulose. Pure xylan, consisting of only xylopyranosyl residues, is rare. Most forms of a (1→4)-β-D-xylan are decorated with other types of sugar.

a (1→4)-β-D-xylan compound structure

a (1→4)-β-D-xylan compound structure

Child Classes: a (1->4)-β-D-xylan oligosaccharide (0), a glucuronoarabinoxylan (0), a glucuronoxylan (0), acetylxylan (0), an arabinoglucuronoxylan (0), an arabinoxylan (0), feraxan (0)

SMILES: C1(O[R2])(OCC(C(O)C(O)1)OC2(OCC(C(O)C(O)2)OC3(OCC(C(O)C(O)3)OC4(OCC(O[R1])C(O)C(O)4))))

Unification Links: CAS:9014-63-5, ChEBI:15447, KEGG:C02352

Reactions known to consume the compound:

(1,4)-β-xylan degradation :
a (1→4)-β-D-xylan → a (1->4)-β-D-xylan oligosaccharide

cellulose and hemicellulose degradation (cellulolosome) :
a (1→4)-β-D-xylan + n H2O → n a (1->4)-β-D-xylan oligosaccharide

xylan biosynthesis :
UDP-α-D-xylose + [(1->4)-β-D-xylan](n) → UDP + [(1->4)-β-D-xylan](n+1)
UDP-β-L-arabinopyranose + a (1→4)-β-D-xylan → an arabinoxylan + UDP
UDP-α-D-glucuronate + a (1→4)-β-D-xylan → a glucuronoxylan + UDP

Not in pathways:
a glucuronoxylan + H2O → 4-O-methyl-α-D-glucuronate + a (1→4)-β-D-xylan

Not in pathways:
xylan + n H2O → n α-D-xylopyranose
acetylxylan + n H2O → xylan + n acetate

Reactions known to produce the compound:

cellulose and hemicellulose degradation (cellulolosome) :
a feruloyl-polysaccharide + H2O → ferulate + a polysaccharide + H+

Created 04-Apr-2011 by Caspi R, SRI International


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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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