Crystal structure of D-xylonate dehydratase in holo-form

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

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The crystal structure of D-xylonate dehydratase reveals functional features of enzymes from the Ilv/ED dehydratase family.

Rahman, M.M.Andberg, M.Koivula, A.Rouvinen, J.Hakulinen, N.

(2018) Sci Rep 8: 865-865

  • DOI: https://doi.org/10.1038/s41598-018-19192-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Ilv/ED dehydratase protein family includes dihydroxy acid-, gluconate-, 6-phosphogluconate- and pentonate dehydratases. The members of this family are involved in various biosynthetic and carbohydrate metabolic pathways. Here, we describe the first crystal structure of D-xylonate dehydratase from Caulobacter crescentus (CcXyDHT) at 2.7 Å resolution and compare it with other available enzyme structures from the IlvD/EDD protein family. The quaternary structure of CcXyDHT is a tetramer, and each monomer is composed of two domains in which the N-terminal domain forms a binding site for a [2Fe-2S] cluster and a Mg 2+ ion. The active site is located at the monomer-monomer interface and contains residues from both the N-terminal recognition helix and the C-terminus of the dimeric counterpart. The active site also contains a conserved Ser490, which probably acts as a base in catalysis. Importantly, the cysteines that participate in the binding and formation of the [2Fe-2S] cluster are not all conserved within the Ilv/ED dehydratase family, which suggests that some members of the IlvD/EDD family may bind different types of [Fe-S] clusters.

  • Organizational Affiliation

    Department of Chemistry, University of Eastern Finland, PO Box 111, FIN-80101, Joensuu, Finland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Dehydratase, IlvD/Edd family
A, B, C, D
600Caulobacter vibrioides CB15Mutation(s): 0 
Gene Names: CC_0819
Find proteins for Q9A9Z2 (Caulobacter vibrioides (strain ATCC 19089 / CB15))
Explore Q9A9Z2 
Go to UniProtKB:  Q9A9Z2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9A9Z2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 270.42α = 90
b = 236.13β = 97.38
c = 65.16γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Academy of FinlandFinlandDecisions 256937 and 263931

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-24
    Type: Initial release
  • Version 1.1: 2018-04-18
    Changes: Data collection, Database references