4ay1 | pdb_00004ay1

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Human YKL-39 is a pseudo-chitinase with retained chitooligosaccharide binding properties

spinqualitylabelsall models 4ay1, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ay1 is a 12 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Warning: this is a large structure, and loading might take a long time or not happen at all. Function [CH3L2_HUMAN] Lectin that binds chitooligosaccharides and other glycans with high affinity, but not heparin. Has no chitinase activity. Publication Abstract from PubMed The chitinase-like proteins YKL-39 (chitinase 3-like-2) and YKL-40 (chitinase 3-like-1) are highly expressed in a number of human cells independent of their origin (mesenchymal, epithelial or haemapoietic). Elevated serum levels of YKL-40 have been associated with a negative outcome in a number of diseases ranging from cancer to inflammation and asthma. YKL-39 expression has been associated with osteoarthritis. However, despite the reported association with disease, the physiological or pathological role of these proteins is still very poorly understood. Although YKL-39 is homologous to the two family 18 chitinases in the human genome, it has been reported to lack any chitinase activity. In the present study, we show that human YKL-39 possesses a chitinase-like fold, but lacks key active-site residues required for catalysis. A glycan screen identified oligomers of N-acetylglucosamine as preferred binding partners. YKL-39 binds chitooligosaccharides and a newly synthesized derivative of the bisdionin chitinase-inhibitor class with micromolar affinity, through a number of conserved tryptophan residues. Strikingly, the chitinase activity of YKL-39 was recovered by reverting two non-conservative substitutions in the active site to those found in the active enzymes, suggesting that YKL-39 is a pseudo-chitinase with retention of chitinase-like ligand-binding properties. Human YKL-39 is a pseudo-chitinase with retained chitooligosaccharide-binding properties.,Schimpl M, Rush CL, Betou M, Eggleston IM, Recklies AD, van Aalten DM Biochem J. 2012 Aug 15;446(1):149-57. PMID:22742450 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Chitinase-3-like protein

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