1v0f

ENDOSIALIDASE OF BACTERIOPHAGE K1F IN COMPLEX WITH OLIGOMERIC ALPHA-2,8-SIALIC ACID

spinqualitylabelsall models 1v0f, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1v0f is a 6 chain structure with sequence from Enterobacteria phage k1f. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: PO4, SLB NonStd Res: SIA Related: 1v0e Activity: Endo-alpha-sialidase, with EC number 3.2.1.129 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Phages infecting the polysialic acid (polySia)-encapsulated human pathogen Escherichia coli K1 are equipped with capsule-degrading tailspikes known as endosialidases, which are the only identified enzymes that specifically degrade polySia. As polySia also promotes cellular plasticity and tumor metastasis in vertebrates, endosialidases are widely applied in polySia-related neurosciences and cancer research. Here we report the crystal structures of endosialidase NF and its complex with oligomeric sialic acid. The structure NF, which reveals three distinct domains, indicates that the unique polySia specificity evolved from a combination of structural elements characteristic of exosialidases and bacteriophage tailspike proteins. The endosialidase assembles into a catalytic trimer stabilized by a triple beta-helix. Its active site differs markedly from that of exosialidases, indicating an endosialidase-specific substrate-binding mode and catalytic mechanism. Residues essential for endosialidase activity were identified by structure-based mutational analysis. Crystal structure of the polysialic acid-degrading endosialidase of bacteriophage K1F.,Stummeyer K, Dickmanns A, Muhlenhoff M, Gerardy-Schahn R, Ficner R Nat Struct Mol Biol. 2005 Jan;12(1):90-6. Epub 2004 Dec 19. PMID:15608653 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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