2fv0
UGL_D88N/dGlcA-Glc-Rha-Glc
Structural highlights
FunctionUGL_BACGL Catalyzes the hydrolysis of oligosaccharides with unsaturated glucuronyl residues at the non-reducing terminal, to a sugar or an amino sugar, and an unsaturated D-glucuronic acid (GlcA), which is nonenzymatically converted immediately to alpha-keto acid.[1] [2] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBacterial unsaturated glucuronyl hydrolases (UGLs) together with polysaccharide lyases are responsible for the complete depolymerization of mammalian extracellular matrix glycosaminoglycans. UGL acts on various oligosaccharides containing unsaturated glucuronic acid (DeltaGlcA) at the nonreducing terminus and releases DeltaGlcA through hydrolysis. In this study, we demonstrate the substrate recognition mechanism of the UGL of Bacillus sp. GL1 by determining the X-ray crystallographic structure of its substrate-enzyme complexes. The tetrasaccharide-enzyme complex demonstrated that at least four subsites are present in the active pocket. Although several amino acid residues are crucial for substrate binding, the enzyme strongly recognizes DeltaGlcA at subsite -1 through the formation of hydrogen bonds and stacking interactions, and prefers N-acetyl-d-galactosamine and glucose rather than N-acetyl-d-glucosamine as a residue accommodated in subsite +1, due to the steric hindrance. Substrate recognition by unsaturated glucuronyl hydrolase from Bacillus sp. GL1.,Itoh T, Hashimoto W, Mikami B, Murata K Biochem Biophys Res Commun. 2006 May 26;344(1):253-62. PMID:16630576[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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