Crystal structure of D-glucuronyl C5 epimerase

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 

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Structural and Functional Study of d-Glucuronyl C5-epimerase.

Qin, Y.Ke, J.Gu, X.Fang, J.Wang, W.Cong, Q.Li, J.Tan, J.Brunzelle, J.S.Zhang, C.Jiang, Y.Melcher, K.Li, J.P.Xu, H.E.Ding, K.

(2015) J Biol Chem 290: 4620-4630

  • DOI: https://doi.org/10.1074/jbc.M114.602201
  • Primary Citation of Related Structures:  
    4PW2, 4PXQ

  • PubMed Abstract: 

    Heparan sulfate (HS) is a glycosaminoglycan present on the cell surface and in the extracellular matrix, which interacts with diverse signal molecules and is essential for many physiological processes including embryonic development, cell growth, inflammation, and blood coagulation. D-glucuronyl C5-epimerase (Glce) is a crucial enzyme in HS synthesis, converting D-glucuronic acid to L-iduronic acid to increase HS flexibility. This modification of HS is important for protein ligand recognition. We have determined the crystal structures of Glce in apo-form (unliganded) and in complex with heparin hexasaccharide (product of Glce following O-sulfation), both in a stable dimer conformation. A Glce dimer contains two catalytic sites, each at a positively charged cleft in C-terminal α-helical domains binding one negatively charged hexasaccharide. Based on the structural and mutagenesis studies, three tyrosine residues, Tyr(468), Tyr(528), and Tyr(546), in the active site were found to be crucial for the enzymatic activity. The complex structure also reveals the mechanism of product inhibition (i.e. 2-O- and 6-O-sulfation of HS keeps the C5 carbon of L-iduronic acid away from the active-site tyrosine residues). Our structural and functional data advance understanding of the key modification in HS biosynthesis.

  • Organizational Affiliation

    From the Glycochemistry and Glycobiology Laboratory, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Pudong, Shanghai 201203, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
D-glucuronyl C5 epimerase B585Danio rerioMutation(s): 0 
Gene Names: D-glucuronyl C5-epimeraseglceglceb
Find proteins for F1QR43 (Danio rerio)
Explore F1QR43 
Go to UniProtKB:  F1QR43
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupF1QR43
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CIT

Download Ideal Coordinates CCD File 
C6 H8 O7
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.379α = 90
b = 66.379β = 90
c = 337.571γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-14
    Type: Initial release
  • Version 1.1: 2015-02-25
    Changes: Database references
  • Version 1.2: 2015-03-18
    Changes: Database references