3P14

Crystal structure of L-rhamnose isomerase with a novel high thermo-stability from Bacillus halodurans

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 

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This is version 1.2 of the entry. See complete history. 


Literature

Structure-based studies on the metal binding of two-metal-dependent sugar isomerases.

Prabhu, P., Doan, T.N., Tiwari, M., Singh, R., Kim, S.C., Hong, M.K., Kang, Y.C., Kang, L.W., Lee, J.K.

(2014) FEBS J 281: 3446-3459

  • DOI: 10.1111/febs.12872
  • Primary Citation of Related Structures:  
    3UXI, 3UU0, 3UVA, 3P14

  • PubMed Abstract: 

    • Two-metal-dependent sugar isomerases are important in the synthesis of rare sugars. Many of their properties, specifically their metal dependency, have not been sufficiently explored. Here we used X-ray crystallography, site-directed mutagenesis, isothermal titration calorimetry and electron paramagnetic resonance spectroscopy to investigate the molecular determinants of the metal-binding affinity of l-rhamnose isomerase, a two-Mn(2+) -dependent isomerase from Bacillus halodurans (BHRI) ...

    Two-metal-dependent sugar isomerases are important in the synthesis of rare sugars. Many of their properties, specifically their metal dependency, have not been sufficiently explored. Here we used X-ray crystallography, site-directed mutagenesis, isothermal titration calorimetry and electron paramagnetic resonance spectroscopy to investigate the molecular determinants of the metal-binding affinity of l-rhamnose isomerase, a two-Mn(2+) -dependent isomerase from Bacillus halodurans (BHRI). The crystal structure of BHRI confirmed the presence of two metal ion-binding sites: a structural metal ion-binding site for substrate binding, and a catalytic metal ion-binding site that catalyzes a hydride shift. One conserved amino acid, W38, in wild-type BHRI was identified as a critical residue for structural Mn(2+) binding and thus the catalytic efficiency of BHRI. This function of W38 was explored by replacing it with other amino acids. Substitution by Phe, His, Lys, Ile or Ala caused complete loss of catalytic activity. The role of W38 was further examined by analyzing the crystal structure of wild-type BHRI and two inactive mutants of BHRI (W38F and W38A) in complex with Mn(2+) . A structural comparison of the mutants and the wild-type revealed differences in their coordination of Mn(2+) , including changes in metal-ligand bond length and affinity for Mn(2+) . The role of W38 was further confirmed in another two-metal-dependent enzyme: xylose isomerase from Bacillus licheniformis. These data suggest that W38 stabilizes protein-metal complexes and in turn assists ligand binding during catalysis in two-metal-dependent isomerases.

    Organizational Affiliation: 

    Department of Bioscience and Biotechnology, Konkuk University, Seoul, Korea.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
L-rhamnose isomerase A, B, C, D424Alkalihalobacillus haloduransMutation(s): 0 
Gene Names: BH1552, rhaA
EC: 5.3.1.14
Find proteins for Q9KCL9 (Bacillus halodurans (strain ATCC BAA-125 / DSM 18197 / FERM 7344 / JCM 9153 / C-125))
Explore Q9KCL9 
Go to UniProtKB:  Q9KCL9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.24α = 90
b = 164.88β = 115.97
c = 92.01γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-08-20
    Changes: Database references