Crystal structure of a novel unsaturated beta-glucuronyl hydrolase enzyme, belonging to family GH105, involved in ulvan degradation

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.165 

wwPDB Validation   3D Report Full Report

This is version 1.1 of the entry. See complete history


A Novel Unsaturated Beta-Glucuronyl Hydrolase Involved in Ulvan Degradation Unveils the Versatility of Stereochemistry Requirements in Family Gh105.

Nyvall-Collen, P.Jeudy, A.Sassi, J.Groisillier, A.Czjzek, M.Coutinho, P.M.Helbert, W.

(2014) J Biol Chem 289: 6199

  • DOI: https://doi.org/10.1074/jbc.M113.537480
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Ulvans are cell wall matrix polysaccharides in green algae belonging to the genus Ulva. Enzymatic degradation of the polysaccharide by ulvan lyases leads to the production of oligosaccharides with an unsaturated β-glucuronyl residue located at the non-reducing end. Exploration of the genomic environment around the Nonlabens ulvanivorans (previously Percicivirga ulvanivorans) ulvan lyase revealed a gene highly similar to known unsaturated uronyl hydrolases classified in the CAZy glycoside hydrolase family 105. The gene was cloned, the protein was overexpressed in Escherichia coli, and enzymology experiments demonstrated its unsaturated β-glucuronyl activity. Kinetic analysis of purified oligo-ulvans incubated with the new enzyme showed that the full substrate specificity is attained by three subsites that preferentially bind anionic residues (sulfated rhamnose, glucuronic/iduronic acid). The three-dimensional crystal structure of the native enzyme reveals that a trimeric organization is required for substrate binding and recognition at the +2 binding subsite. This novel unsaturated β-glucuronyl hydrolase is part of a previously uncharacterized subgroup of GH105 members and exhibits only a very limited sequence similarity to known unsaturated β-glucuronyl sequences previously found only in family GH88. Clan-O formed by families GH88 and GH105 was singular in the fact that it covered families acting on both axial and equatorial glycosidic linkages, respectively. The overall comparison of active site structures between enzymes from these two families highlights how that within family GH105, and unlike for classical glycoside hydrolysis, the hydrolysis of vinyl ether groups from unsaturated saccharides occurs independently of the α or β configuration of the cleaved linkage.

  • Organizational Affiliation

    From the CNRS, Université Pierre et Marie Curie-Paris 6, Unité Mixte de Recherche 7139 "Marine Plants and Biomolecules," Station Biologique, F-29682 Roscoff Cedex, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
370Nonlabens ulvanivoransMutation(s): 0 
Gene Names: IL45_01505
EC: (PDB Primary Data), 3.2.1 (UniProt)
Find proteins for L7P9J4 (Nonlabens ulvanivorans)
Explore L7P9J4 
Go to UniProtKB:  L7P9J4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupL7P9J4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.207 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.165 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.978α = 90
b = 93.331β = 90
c = 156.758γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-01-22
    Type: Initial release
  • Version 1.1: 2014-03-12
    Changes: Database references