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Information on EC 4.2.2.19 - chondroitin B lyase

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EC Tree
     4 Lyases
         4.2 Carbon-oxygen lyases
             4.2.2 Acting on polysaccharides
                4.2.2.19 chondroitin B lyase
IUBMB Comments
This is the only lyase that is known to be specific for dermatan sulfate as substrate. The minimum substrate length required for catalysis is a tetrasaccharide . In general, chondroitin sulfate (CS) and dermatan sulfate (DS) chains comprise a linkage region, a chain cap and a repeat region. The repeat region of CS is a repeating disaccharide of glucuronic acid (GlcA) and N-acetylgalactosamine (GalNAc) [-4)GlcA(beta1-3)GalNAc(beta1-]n, which may be O-sulfated on the C-4 and/or C-6 of GalNAc and C-2 of GlcA. GlcA residues of CS may be epimerized to iduronic acid (IdoA) forming the repeating disaccharide [-4)IdoA(alpha1-3)GalNAc(beta1-]n of DS. Both the concentrations and locations of sulfate-ester substituents vary with glucosaminoglycan source .
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
Synonyms
chondroitinase b, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
Eliminative cleavage of dermatan sulfate containing (1->4)-beta-D-hexosaminyl and (1->3)-beta-D-glucurosonyl or (1->3)-alpha-L-iduronosyl linkages to disaccharides containing 4-deoxy-beta-D-gluc-4-enuronosyl groups to yield a 4,5-unsaturated dermatan-sulfate disaccharide (DeltaUA-GalNAc-4S).
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PATHWAY SOURCE
PATHWAYS
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