Crystal structure of D-3-hydroxybutyrate dehydrogenase from Alcaligenes faecalis complexed with NAD+ and a substrate D-3-hydroxybutyrate

Experimental Data Snapshot

  • Resolution: 1.19 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.158 

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Structural insights into the catalytic reaction trigger and inhibition of D-3-hydroxybutyrate dehydrogenase

Kanazawa, H.Hoque, M.M.Tsunoda, M.Suzuki, K.Yamamoto, T.Kawai, G.Kondo, J.Takenaka, A.

(2016) Acta Crystallogr F Struct Biol Commun 72: 507-515

  • DOI: https://doi.org/10.1107/S2053230X16007767
  • Primary Citation of Related Structures:  
    5B4T, 5B4U, 5B4V

  • PubMed Abstract: 

    D-3-Hydroxybutyrate dehydrogenase catalyzes the reversible conversion of acetoacetate and D-3-hydroxybutyrate. These ketone bodies are both energy-storage forms of acetyl-CoA. In order to clarify the structural mechanisms of the catalytic reaction with the cognate substrate D-3-hydroxybutyrate and of the inhibition of the reaction by inhibitors, the enzyme from Alcaligenes faecalis has been analyzed by X-ray crystallography in liganded states with the substrate and with two types of inhibitor: malonate and methylmalonate. In each subunit of the tetrameric enzyme, the substrate is trapped on the nicotinamide plane of the bound NAD(+). An OMIT map definitively shows that the bound ligand is D-3-hydroxybutyrate and not acetoacetate. The two carboxylate O atoms form four hydrogen bonds to four conserved amino-acid residues. The methyl group is accommodated in the nearby hydrophobic pocket so that the formation of a hydrogen bond from the OH group of the substrate to the hydroxy group of Tyr155 at the active centre is facilitated. In this geometry, the H atom attached to the C(3) atom of the substrate in the sp(3) configuration is positioned at a distance of 3.1 Å from the nicotinamide C(4) atom in the direction normal to the plane. In addition, the donor-acceptor relationship of the hydrogen bonds suggests that the Tyr155 OH group is allowed to ionize by the two donations from the Ser142 OH group and the ribose OH group. A comparison of the protein structures with and without ligands indicates that the Gln196 residue of the small movable domain participates in the formation of additional hydrogen bonds. It is likely that this situation can facilitate H-atom movements as the trigger of the catalytic reaction. In the complexes with inhibitors, however, their principal carboxylate groups interact with the enzyme in a similar way, while the interactions of other groups are changed. The crucial determinant for inhibition is that the inhibitors have no active H atom at C(3). A second determinant is the Tyr155 OH group, which is perturbed by the inhibitors to donate its H atom for hydrogen-bond formation, losing its nucleophilicity.

  • Organizational Affiliation

    Department of Materials and Life Sciences, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-hydroxybutyrate dehydrogenase260Alcaligenes faecalisMutation(s): 0 
Gene Names: UZ73_03715
Find proteins for D0VWQ0 (Alcaligenes faecalis)
Explore D0VWQ0 
Go to UniProtKB:  D0VWQ0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD0VWQ0
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.19 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.157 
  • R-Value Observed: 0.158 
  • Space Group: P 42 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.78α = 90
b = 62.78β = 90
c = 119.49γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-17
    Type: Initial release
  • Version 1.1: 2020-02-26
    Changes: Data collection, Derived calculations