1B15

ALCOHOL DEHYDROGENASE FROM DROSOPHILA LEBANONENSIS TERNARY COMPLEX WITH NAD-ACETONE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The catalytic reaction and inhibition mechanism of Drosophila alcohol dehydrogenase: observation of an enzyme-bound NAD-ketone adduct at 1.4 A resolution by X-ray crystallography.

Benach, J.Atrian, S.Gonzalez-Duarte, R.Ladenstein, R.

(1999) J.Mol.Biol. 289: 335-355

  • DOI: 10.1006/jmbi.1999.2765
  • Primary Citation of Related Structures:  1B14, 1B16, 1B2L

  • PubMed Abstract: 
  • Drosophila alcohol dehydrogenase (DADH) is an NAD+-dependent enzyme that catalyzes the oxidation of alcohols to aldehydes/ketones. DADH is the member of the short-chain dehydrogenases/reductases family (SDR) for which the largest amount of biochemica ...

    Drosophila alcohol dehydrogenase (DADH) is an NAD+-dependent enzyme that catalyzes the oxidation of alcohols to aldehydes/ketones. DADH is the member of the short-chain dehydrogenases/reductases family (SDR) for which the largest amount of biochemical data has been gathered during the last three decades. The crystal structures of one binary form (NAD+) and three ternary complexes with NAD+.acetone, NAD+.3-pentanone and NAD+.cyclohexanone were solved at 2.4, 2.2, 1. 4 and 1.6 A resolution, respectively. From the molecular interactions observed, the reaction mechanism could be inferred. The structure of DADH undergoes a conformational change in order to bind the coenzyme. Furthermore, upon binding of the ketone, a region that was disordered in the apo form (186-191) gets stabilized and closes the active site cavity by creating either a small helix (NAD+. acetone, NAD+.3-pentanone) or an ordered loop (NAD+.cyclohexanone). The active site pocket comprises a hydrophobic bifurcated cavity which explains why the enzyme is more efficient in oxidizing secondary aliphatic alcohols (preferably R form) than primary ones. Difference Fourier maps showed that the ketone inhibitor molecule has undergone a covalent reaction with the coenzyme in all three ternary complexes. Due to the presence of the positively charged ring of the coenzyme (NAD+) and the residue Lys155, the amino acid Tyr151 is in its deprotonated (tyrosinate) state at physiological pH. Tyr151 can subtract a proton from the enolic form of the ketone and catalyze a nucleophilic attack of the Calphaatom to the C4 position of the coenzyme creating an NAD-ketone adduct. The binding of these NAD-ketone adducts to DADH accounts for the inactivation of the enzyme. The catalytic reaction proceeds in a similar way, involving the same amino acids as in the formation of the NAD-ketone adduct. The p Kavalue of 9-9.5 obtained by kinetic measurements on apo DADH can be assigned to a protonated Tyr151 which is converted to an unprotonated tyrosinate (p Ka7.6) by the influence of the positively charged nicotinamide ring in the binary enzyme-NAD+form. pH independence during the release of NADH from the binary complex enzyme-NADH can be explained by either a lack of electrostatic interaction between the coenzyme and Tyr151 or an apparent p Kavalue for this residue higher than 10.0.


    Related Citations: 
    • The Refined Crystal Structure of Drosophila Lebanonensis Alcohol Dehydrogenase at 1.9 A Resolution
      Benach, J.,Atrian, S.,Gonzalez-Duarte, R.,Ladenstein, R.
      (1998) J.Mol.Biol. 282: 383


    Organizational Affiliation

    Karolinska Institutet, Novum, Center for Structural Biochemistry, Huddinge, S-14157, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ALCOHOL DEHYDROGENASE
A, B
254Drosophila lebanonensisGene Names: Adh
EC: 1.1.1.1
Find proteins for P10807 (Drosophila lebanonensis)
Go to UniProtKB:  P10807
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAE
Query on NAE

Download SDF File 
Download CCD File 
A, B
NICOTINAMIDE ADENINE DINUCLEOTIDE ACETONE ADDUCT
C24 H31 N7 O15 P2
SGHBFOOIAAJJMI-YDKVLQLQSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 66.700α = 90.00
b = 53.500β = 107.10
c = 70.700γ = 90.00
Software Package:
Software NamePurpose
CCP4model building
RAVEphasing
RAVEmodel building
Omodel building
MAINphasing
AMoREphasing
DENZOdata reduction
SCALEPACKdata scaling
CCP4phasing
REFMACrefinement
MAINmodel building
X-PLORphasing
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-11-26
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance