3VKJ

Crystal structure of Sulfolobus shibatae isopentenyl diphosphate isomerase, octameric form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.186 

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This is version 1.1 of the entry. See complete history


Literature

Substrate-Induced Change in the Quaternary Structure of Type 2 Isopentenyl Diphosphate Isomerase from Sulfolobus shibatae.

Nakatani, H.Goda, S.Unno, H.Nagai, T.Yoshimura, T.Hemmi, H.

(2012) J Bacteriol 194: 3216-3224

  • DOI: https://doi.org/10.1128/JB.00068-12
  • Primary Citation of Related Structures:  
    3VKJ

  • PubMed Abstract: 

    Type 2 isopentenyl diphosphate isomerase catalyzes the interconversion between two active units for isoprenoid biosynthesis, i.e., isopentenyl diphosphate and dimethylallyl diphosphate, in almost all archaea and in some bacteria, including human pathogens. The enzyme is a good target for discovery of antibiotics because it is essential for the organisms that use only the mevalonate pathway to produce the active isoprene units and because humans possess a nonhomologous isozyme, type 1 isopentenyl diphosphate isomerase. However, type 2 enzymes were reportedly inhibited by mechanism-based drugs for the type 1 enzyme due to their surprisingly similar reaction mechanisms. Thus, a different approach is now required to develop new inhibitors specific to the type 2 enzyme. X-ray crystallography and gel filtration chromatography revealed that the enzyme from a thermoacidophilic archaeon, Sulfolobus shibatae, is in the octameric state at a high concentration. Interestingly, a part of the regions that are involved in the substrate binding in the previously reported tetrameric structures is integral to the formation of the tetramer-tetramer interface in the substrate-free octameric structure. Site-directed mutagenesis at such regions resulted in stabilization of the tetramer. Small-angle X-ray scattering, tryptophan fluorescence, and dynamic light scattering analyses showed that substrate binding causes the dissociation of an octamer into tetramers. This property, i.e., incompatibility between octamer formation and substrate binding, might provide clues to develop new specific inhibitors of the archaeal enzyme.


  • Organizational Affiliation

    Department of Applied Molecular Bioscience, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Aichi, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Isopentenyl-diphosphate delta-isomerase
A, B, C, D
368Saccharolobus shibataeMutation(s): 0 
Gene Names: fniidi
EC: 5.3.3.2
UniProt
Find proteins for P61615 (Saccharolobus shibatae (strain ATCC 51178 / DSM 5389 / JCM 8931 / NBRC 15437 / B12))
Explore P61615 
Go to UniProtKB:  P61615
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61615
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.186 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.841α = 90
b = 100.841β = 90
c = 336.651γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-05-30
    Type: Initial release
  • Version 1.1: 2012-07-11
    Changes: Database references