4AY1

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 

wwPDB Validation   3D Report Full Report


This is version 3.0 of the entry. See complete history. 


Literature

Human Ykl-39 is a Pseudo-Chitinase with Retained Chitooligosaccharide-Binding Properties.

Schimpl, M., Rush, C.L., Betou, M., Eggleston, I.M., Recklies, A.D., Van Aalten, D.M.F.

(2012) Biochem J 446: 149

  • DOI: 10.1042/BJ20120377
  • Primary Citation of Related Structures:  
    4AY1

  • PubMed Abstract: 

    • 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 ...

    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.

    Organizational Affiliation: 

    Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, Scotland, UK.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHITINASE-3-LIKE PROTEIN 2A, B, C, D, E, F, G, H, A,  B,  C,  D,  E,  F,  G,  H,  I,  J,  K,  L
365Homo sapiensMutation(s): 0 
Gene Names: CHI3L2
Find proteins for Q15782 (Homo sapiens)
Explore Q15782 
Go to UniProtKB:  Q15782
NIH Common Fund Data Resources
PHAROS:  Q15782
GTEx:  ENSG00000064886
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
M, N, O, P, Q, R, S, T, U, V, W, X
4 N/A Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 255.686α = 90
b = 152.543β = 94.62
c = 138.186γ = 90
Software Package:
Software NamePurpose
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-08
    Type: Initial release
  • Version 2.0: 2018-04-11
    Changes: Advisory, Atomic model, Data collection, Derived calculations
  • Version 3.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary