3B05

Crystal structure of Sulfolobus shibatae isopentenyl diphosphate isomerase in complex with reduced FMN and IPP at 2.2A resolution.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Covalent modification of reduced flavin mononucleotide in type-2 isopentenyl diphosphate isomerase by active-site-directed inhibitors.

Nagai, T.Unno, H.Janczak, M.W.Yoshimura, T.Poulter, C.D.Hemmi, H.

(2011) Proc Natl Acad Sci U S A 108: 20461-20466

  • DOI: https://doi.org/10.1073/pnas.1115749108
  • Primary Citation of Related Structures:  
    3B03, 3B04, 3B05, 3B06

  • PubMed Abstract: 

    Evidence for an unusual catalysis of protonation/deprotonation by a reduced flavin mononucleotide cofactor is presented for type-2 isopentenyl diphosphate isomerase (IDI-2), which catalyzes isomerization of the two fundamental building blocks of isoprenoid biosynthesis, isopentenyl diphosphate and dimethylallyl diphosphate. The covalent adducts formed between irreversible mechanism-based inhibitors, 3-methylene-4-penten-1-yl diphosphate or 3-oxiranyl-3-buten-1-yl diphosphate, and the flavin cofactor were investigated by X-ray crystallography and UV-visible spectroscopy. Both the crystal structures of IDI-2 binding the flavin-inhibitor adduct and the UV-visible spectra of the adducts indicate that the covalent bond is formed at C4a of flavin rather than at N5, which had been proposed previously. In addition, the high-resolution crystal structures of IDI-2-substrate complexes and the kinetic studies of new mutants confirmed that only the flavin cofactor can catalyze protonation of the substrates and suggest that N5 of flavin is most likely to be involved in proton transfer. These data provide support for a mechanism where the reduced flavin cofactor acts as a general acid/base catalyst and helps stabilize the carbocationic intermediate formed by protonation.


  • Organizational Affiliation

    Department of Applied Molecular Bioscience, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, 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
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
FNR
Query on FNR

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
K [auth C],
N [auth D]
1-DEOXY-1-(7,8-DIMETHYL-2,4-DIOXO-3,4-DIHYDRO-2H-BENZO[G]PTERIDIN-1-ID-10(5H)-YL)-5-O-PHOSPHONATO-D-RIBITOL
C17 H23 N4 O9 P
YTNIXZGTHTVJBW-SCRDCRAPSA-N
IPE
Query on IPE

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
L [auth C],
O [auth D]
3-METHYLBUT-3-ENYL TRIHYDROGEN DIPHOSPHATE
C5 H12 O7 P2
NUHSROFQTUXZQQ-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
G [auth A],
J [auth B],
M [auth C],
P [auth D]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.617α = 90
b = 101.617β = 90
c = 333.078γ = 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: 2011-11-02
    Type: Initial release
  • Version 1.1: 2012-05-23
    Changes: Database references
  • Version 1.2: 2024-03-13
    Changes: Data collection, Database references, Derived calculations, Refinement description