4p8v

The crystal structures of YKL-39 in the presence of chitooligosaccharides (GlcNAc2) were solved to resolutions of 1.5 angstrom

spinqualitylabelsall models 4p8v, resolution 1.64Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4p8v is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4, NAG Related: 4p8x, 4p8u Resources: FirstGlance, OCA, RCSB, PDBsum Function [CH3L2_HUMAN] Lectin that binds chitooligosaccharides and other glycans with high affinity, but not heparin. Has no chitinase activity. Publication Abstract from PubMed Four crystal structures of human YKL-39 were solved in the absence and presence of chitooligosaccharides. The structure of YKL-39 comprises a major (beta/alpha)8 TIM barrel domain and a small alpha+beta insertion domain. Structural analysis demonstrates that YKL-39 interacts with chitooligosaccharides through hydrogen bonds and hydrophobic interactions. The binding of chitin fragments induces local conformational changes that facilitate tight binding. Compared with other GH-18 members, YKL-39 has the least extended chitin-binding cleft, containing five subsites for sugars, namely (-3)(-2)(-1)(+1)(+2), with Trp360 playing a prominent role in the sugar-protein interactions at the centre of the chitin-binding cleft. Evaluation of binding affinities obtained from isothermal titration calorimetry and intrinsic fluorescence spectroscopy suggests that YKL-39 binds to chitooligosaccharides with Kd values in the micromolar concentration range and that the binding energies increase with the chain length. There were no significant differences between the Kd values of chitopentaose and chitohexaose, supporting the structural evidence for the five-binding subsite topology. Thermodynamic analysis indicates that binding of chitooligosaccharide to YKL-39 is mainly driven by enthalpy. Structural and thermodynamic insights into chitooligosaccharide binding to human cartilage chitinase 3-like protein 2 (CHI3L2 or YKL-39).,Ranok A, Wongsantichon J, Robinson RC, Suginta W J Biol Chem. 2014 Dec 4. pii: jbc.M114.588905. PMID:25477513 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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