Structures of the Streptomyces coelicolor A3(2) Hyaluronan Lyase in Complex with Oligosaccharide Substrates and an Inhibitor

Experimental Data Snapshot

  • Resolution: 1.94 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 

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Crystal Structures of a Family 8 Polysaccharide Lyase Reveal Open and Highly Occluded Substrate-Binding Cleft Conformations.

Elmabrouk, Z.H.Vincent, F.Zhang, M.Smith, N.L.Turkenburg, J.P.Charnock, S.J.Black, G.W.Taylor, E.J.

(2011) Proteins 79: 965

  • DOI: https://doi.org/10.1002/prot.22938
  • Primary Citation of Related Structures:  
    2WCO, 2WDA, 2X03

  • PubMed Abstract: 

    Bacterial enzymatic degradation of glycosaminoglycans such as hyaluronan and chondroitin is facilitated by polysaccharide lyases. Family 8 polysaccharide lyase (PL8) enzymes contain at least two domains: one predominantly composed of α-helices, the α-domain, and another predominantly composed of β-sheets, the β-domain. Simulation flexibility analyses indicate that processive exolytic cleavage of hyaluronan, by PL8 hyaluronate lyases, is likely to involve an interdomain shift, resulting in the opening/closing of the substrate-binding cleft between the α- and β-domains, facilitating substrate translocation. Here, the Streptomyces coelicolor A3(2) PL8 enzyme was recombinantly expressed in and purified from Escherichia coli and biochemically characterized as a hyaluronate lyase. By using X-ray crystallography its structure was solved in complex with hyaluronan and chondroitin disaccharides. These findings show key catalytic interactions made by the different substrates, and on comparison with all other PL8 structures reveals that the substrate-binding cleft of the S. coelicolor enzyme is highly occluded. A third structure of the enzyme, harboring a mutation of the catalytic tyrosine, created via site-directed mutagenesis, interestingly revealed an interdomain shift that resulted in the opening of the substrate-binding cleft. These results add further support to the proposed processive mechanism of action of PL8 hyaluronate lyases and may indicate that the mechanism of action is likely to be universally used by PL8 hyaluronate lyases.

  • Organizational Affiliation

    Department of Biomedical Sciences, School of Life Sciences, Northumbria University, Newcastle upon Tyne NE1 8ST, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PUTATIVE SECRETED LYASE765Streptomyces coelicolor A3(2)Mutation(s): 0 
Find proteins for O86516 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore O86516 
Go to UniProtKB:  O86516
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO86516
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
4-deoxy-beta-D-glucopyranuronic acid-(1-3)-2-acetamido-2-deoxy-beta-D-glucopyranose
Glycosylation Resources
GlyTouCan:  G40515XE
GlyCosmos:  G40515XE
Experimental Data & Validation

Experimental Data

  • Resolution: 1.94 Å
  • R-Value Free: 0.193 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 140.11α = 90
b = 140.11β = 90
c = 100.652γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-18
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2024-05-08
    Changes: Data collection, Database references, Structure summary