3eka

Crystal structure of the complex of hyaluranidase trimer with ascorbic acid at 3.1 A resolution reveals the locations of three binding sites

spinqualitylabelsall models 3eka, resolution 3.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3eka is a 1 chain structure with sequence from Streptococcus pyogenes. This structure supersedes the now removed PDB entry 2pk1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.1Å Ligands: ASC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9A0M7_STRP1 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 Hyaluronate lyases are a class of endoglycosaminidase enzymes with a high level of complexity and heterogeneity. The main function of the Streptococcus pyogenes bacteriophage protein hyaluronate lyase, HylP2, is to degrade hyaluronan into unsaturated disaccharide units. HylP2 was cloned, over-expressed and purified to homogeneity. The recombinant HylP2 exists as a homotrimer with a molecular mass of approximately 110 kDa under physiological conditions. The HylP2 was crystallized and the crystals were soaked in two separate reservoir solutions containing ascorbic acid and lactose, respectively. The crystal structures of native HylP2 and its two complexes with ascorbic acid and lactose have been determined. HylP2 folds into four distinct domains with a central core consisting of 16 antiparallel beta-strands forming an irregular triangular tube designated as triple-stranded beta-helix. The structures of complexes show that three molecules each of ascorbic acid and lactose bind to protein at the sugar binding groove in the triple-stranded beta-helix domain. Both ascorbic acid and lactose molecules occupy almost identical subsites in the long saccharide binding groove. Both ligands are involved in several hydrogen bonded interactions at each subsite. The binding characteristics and stereochemical properties indicate that Tyr264 may be involved in the catalytic activity of HylP2. The mutation of Tyr264 to Phe264 supports this observation. Polysaccharide binding sites in hyaluronate lyase--crystal structures of native phage-encoded hyaluronate lyase and its complexes with ascorbic acid and lactose.,Mishra P, Prem Kumar R, Ethayathulla AS, Singh N, Sharma S, Perbandt M, Betzel C, Kaur P, Srinivasan A, Bhakuni V, Singh TP FEBS J. 2009 Jun;276(12):3392-402. Epub 2009 May 8. PMID:19438710 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hyaluronidase 3D structures

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