3NTQ

Crystal structure of K97V mutant myo-inositol dehydrogenase from Bacillus subtilis with bound cofactor NAD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6004 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural investigation of myo-inositol dehydrogenase from Bacillus subtilis: implications for catalytic mechanism and inositol dehydrogenase subfamily classification.

van Straaten, K.E.Zheng, H.Palmer, D.R.Sanders, D.A.

(2010) Biochem.J. 432: 237-247

  • DOI: 10.1042/BJ20101079
  • Primary Citation of Related Structures:  3MZ0, 3NT2, 3NT4, 3NT5, 3NTO, 3NTR

  • PubMed Abstract: 
  • Inositol dehydrogenase from Bacillus subtilis (BsIDH) is a NAD+-dependent enzyme that catalyses the oxidation of the axial hydroxy group of myo-inositol to form scyllo-inosose. We have determined the crystal structures of wild-type BsIDH and of the i ...

    Inositol dehydrogenase from Bacillus subtilis (BsIDH) is a NAD+-dependent enzyme that catalyses the oxidation of the axial hydroxy group of myo-inositol to form scyllo-inosose. We have determined the crystal structures of wild-type BsIDH and of the inactive K97V mutant in apo-, holo- and ternary complexes with inositol and inosose. BsIDH is a tetramer, with a novel arrangement consisting of two long continuous β-sheets, formed from all four monomers, in which the two central strands are crossed over to form the core of the tetramer. Each subunit in the tetramer consists of two domains: an N-terminal Rossmann fold domain containing the cofactor-binding site, and a C-terminal domain containing the inositol-binding site. Structural analysis allowed us to determine residues important in cofactor and substrate binding. Lys97, Asp172 and His176 are the catalytic triad involved in the catalytic mechanism of BsIDH, similar to what has been proposed for related enzymes and short-chain dehydrogenases. Furthermore, a conformational change in the nicotinamide ring was observed in some ternary complexes, suggesting hydride transfer to the si-face of NAD+. Finally, comparison of the structure and sequence of BsIDH with other putative inositol dehydrogenases allowed us to differentiate these enzymes into four subfamilies based on six consensus sequence motifs defining the cofactor- and substrate-binding sites.


    Organizational Affiliation

    Department of Chemistry, University of Saskatchewan, Saskatoon, SK, Canada, S7N 5C9.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Inositol 2-dehydrogenase/D-chiro-inositol 3-dehydrogenase
A, B
344Bacillus subtilis (strain 168)Gene Names: iolG (idh)
EC: 1.1.1.18, 1.1.1.369
Find proteins for P26935 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P26935
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download SDF File 
Download CCD File 
A, B
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6004 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.230 
  • Space Group: I 21 3
Unit Cell:
Length (Å)Angle (°)
a = 184.387α = 90.00
b = 184.387β = 90.00
c = 184.387γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata reduction
MxDCdata collection
d*TREKdata scaling
MOLREPphasing
PDB_EXTRACTdata extraction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-09-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-08
    Type: Refinement description