5NHB

Crystal structure of xylose isomerase from Piromyces E2 in complex with two Fe2+ ions


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.246 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Metal Dependence of the Xylose Isomerase from Piromyces sp. E2 Explored by Activity Profiling and Protein Crystallography.

Lee, M.Rozeboom, H.J.de Waal, P.P.de Jong, R.M.Dudek, H.M.Janssen, D.B.

(2017) Biochemistry 56: 5991-6005

  • DOI: https://doi.org/10.1021/acs.biochem.7b00777
  • Primary Citation of Related Structures:  
    5NH4, 5NH5, 5NH6, 5NH7, 5NH8, 5NH9, 5NHA, 5NHB, 5NHC, 5NHD, 5NHE, 5NHM

  • PubMed Abstract: 

    Xylose isomerase from Piromyces sp. E2 (PirXI) can be used to equip Saccharomyces cerevisiae with the capacity to ferment xylose to ethanol. The biochemical properties and structure of the enzyme have not been described even though its metal content, catalytic parameters, and expression level are critical for rapid xylose utilization. We have isolated the enzyme after high-level expression in Escherichia coli, analyzed the metal dependence of its catalytic properties, and determined 12 crystal structures in the presence of different metals, substrates, and substrate analogues. The activity assays revealed that various bivalent metals can activate PirXI for xylose isomerization. Among these metals, Mn 2+ is the most favorable for catalytic activity. Furthermore, the enzyme shows the highest affinity for Mn 2+ , which was established by measuring the activation constants (K act ) for different metals. Metal analysis of the purified enzyme showed that in vivo the enzyme binds a mixture of metals that is determined by metal availability as well as affinity, indicating that the native metal composition can influence activity. The crystal structures show the presence of an active site similar to that of other xylose isomerases, with a d-xylose binding site containing two tryptophans and a catalytic histidine, as well as two metal binding sites that are formed by carboxylate groups of conserved aspartates and glutamates. The binding positions and conformations of the metal-coordinating residues varied slightly for different metals, which is hypothesized to contribute to the observed metal dependence of the isomerase activity.


  • Organizational Affiliation

    Biochemical Laboratory, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Xylose isomerase
A, B, C, D
437Piromyces sp. E2Mutation(s): 0 
Gene Names: xylA
EC: 5.3.1.5
UniProt
Find proteins for Q9P8C9 (Piromyces sp. (strain E2))
Explore Q9P8C9 
Go to UniProtKB:  Q9P8C9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9P8C9
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A],
H [auth A],
M [auth C]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
FE2
Query on FE2

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
I [auth B]
J [auth B]
K [auth C]
E [auth A],
F [auth A],
I [auth B],
J [auth B],
K [auth C],
L [auth C],
N [auth D],
O [auth D]
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.246 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.539α = 115.57
b = 79.51β = 89.96
c = 92.23γ = 116.69
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-11-01
    Type: Initial release
  • Version 1.1: 2017-11-15
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Database references
  • Version 1.3: 2018-08-29
    Changes: Data collection, Database references
  • Version 1.4: 2024-05-01
    Changes: Data collection, Database references, Derived calculations, Refinement description