2D4V

Crystal structure of NAD dependent isocitrate dehydrogenase from Acidithiobacillus thiooxidans


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and quantum chemical analysis of NAD+-dependent isocitrate dehydrogenase: hydride transfer and co-factor specificity

Imada, K.Tamura, T.Takenaka, R.Kobayashi, I.Namba, K.Inagaki, K.

(2008) Proteins 70: 63-71

  • DOI: 10.1002/prot.21486

  • PubMed Abstract: 
  • The crystal structure of Acidithiobacillus thiooxidans isocitrate dehydrogenase complexed with NAD+ and citrate has been solved to a resolution of 1.9 A. The protein fold of this NAD+-dependent enzyme shares a high similarity with those of NADP+-depe ...

    The crystal structure of Acidithiobacillus thiooxidans isocitrate dehydrogenase complexed with NAD+ and citrate has been solved to a resolution of 1.9 A. The protein fold of this NAD+-dependent enzyme shares a high similarity with those of NADP+-dependent bacterial ICDHs. The NAD+ and the citrate are clearly identified in the active site cleft with a well-defined electron density. Asp-357 is the direct cofactor-specificity determinant that interacts with 2'-OH and 3'-OH of the adenosine ribose. The adenosine ribose takes a C2'-endo puckering conformation as previously reported for an NAD+-specific isopropylmalate dehydrogenase. The nicotinamide moiety of NAD+ has the amide NH2 group oriented in cis conformation with respect to the C4 carbon of the nicotinamide ring, slanted toward the bound citrate molecule with a dihedral angle of -21 degrees . The semi-empirical molecular orbital calculation suggests that the pro-R hydrogen atom at C4 of NADH would bear the largest negative charge when the amide NH2 group is in such conformation, suggesting that the amide group has a catalytically significant role in stabilizing the transition state as NADH is being formed during the hydride transfer catalysis.


    Organizational Affiliation

    Department of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan. kimada@fbs.osaka-u.ac.jp




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
isocitrate dehydrogenase
A, B, C, D
429Acidithiobacillus thiooxidansMutation(s): 0 
Gene Names: icd
EC: 1.1.1.42
Find proteins for Q8GAX0 (Acidithiobacillus thiooxidans)
Go to UniProtKB:  Q8GAX0
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download SDF File 
Download CCD File 
A, B, C, D
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
FLC
Query on FLC

Download SDF File 
Download CCD File 
A, B, C, D
CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.179 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 125.981α = 90.00
b = 125.981β = 90.00
c = 267.774γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance