3sli | pdb_00003sli

LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2,7-ANHYDRO-NEU5AC PREPARED BY SOAKING WITH 3'-SIALYLLACTOSE

spinqualitylabelsall models 3sli, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3sli is a 1 chain structure with sequence from Macde. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SKD Gene: T7 (MACDE) Activity: Exo-alpha-sialidase, with EC number 3.2.1.18 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum 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 PubMed Intramolecular trans-sialidase from leech (Macrobdella decora) is the first member of the sialidase superfamily found to exhibit strict specificity towards the cleavage of terminal Neu5Acalpha2-->3Gal linkage in sialoglycoconjugates. Its release of 2,7-anhydro-Neu5Ac instead of Neu5Ac indicates that it catalyzes an intramolecular trans-sialosyl reaction. Crystal structures of its complexes with an inactive substrate analogue 2-propenyl-Neu5Ac, and with the product 2,7-anhydro-Neu5Ac, have been determined to 1.8 A resolution. The boat conformation of the pyranose observed in the complexes supports the proposed enzymatic mechanism that O7 of an axial 6-glycerol group attacks the positively charged C2 of the intermediate. A generalized mechanism is proposed for the sialidase superfamily. The 1.8 A structures of leech intramolecular trans-sialidase complexes: evidence of its enzymatic mechanism.,Luo Y, Li SC, Li YT, Luo M J Mol Biol. 1999 Jan 8;285(1):323-32. PMID:9878409 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Neuraminidase

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