CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
2 | Mainly Beta |
|
2.160 | 3 Solenoid |
|
2.160.20 | Pectate Lyase C-like |
|
2.160.20.10 | Single-stranded right-handed beta-helix, Pectin lyase-like |
Domain Context
CATH Clusters
| Superfamily | Single-stranded right-handed beta-helix, Pectin lyase-like |
| Functional Family |
Enzyme Information
| 4.2.2.19 |
Chondroitin B lyase.
based on mapping to UniProt Q46079
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 (Delta- UA-GalNAc-4S).
-!- 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(beta-1- 3)GalNAc(beta-1-](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(alpha-1-3)GalNAc(beta-1-](n) of DS. -!- Both the concentrations and locations of sulfate-ester substituents vary with glucosaminoglycan source.
|
UniProtKB Entries (1)
| Q46079 |
CSLB_PEDHD
Pedobacter heparinus DSM 2366
Chondroitinase-B
|
PDB Structure
| PDB | 1DBG |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | |
| Primary Citation |
Crystal structure of chondroitinase B from Flavobacterium heparinum and its complex with a disaccharide product at 1.7 A resolution.
J.Mol.Biol.
|