Crystal structure of a possible 3-hydroxyisobutyrate Dehydrogenase from pseudomonas aeruginosa pao1

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

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Biochemical and Structural Studies of Uncharacterized Protein PA0743 from Pseudomonas aeruginosa Revealed NAD+-dependent L-Serine Dehydrogenase.

Tchigvintsev, A.Singer, A.Brown, G.Flick, R.Evdokimova, E.Tan, K.Gonzalez, C.F.Savchenko, A.Yakunin, A.F.

(2012) J Biol Chem 287: 1874-1883

  • DOI: https://doi.org/10.1074/jbc.M111.294561
  • Primary Citation of Related Structures:  
    3OBB, 3Q3C

  • PubMed Abstract: 

    The β-hydroxyacid dehydrogenases form a large family of ubiquitous enzymes that catalyze oxidation of various β-hydroxy acid substrates to corresponding semialdehydes. Several known enzymes include β-hydroxyisobutyrate dehydrogenase, 6-phosphogluconate dehydrogenase, 2-(hydroxymethyl)glutarate dehydrogenase, and phenylserine dehydrogenase, but the vast majority of β-hydroxyacid dehydrogenases remain uncharacterized. Here, we demonstrate that the predicted β-hydroxyisobutyrate dehydrogenase PA0743 from Pseudomonas aeruginosa catalyzes an NAD(+)-dependent oxidation of l-serine and methyl-l-serine but exhibits low activity against β-hydroxyisobutyrate. Two crystal structures of PA0743 were solved at 2.2-2.3-Å resolution and revealed an N-terminal Rossmann fold domain connected by a long α-helix to the C-terminal all-α domain. The PA0743 apostructure showed the presence of additional density modeled as HEPES bound in the interdomain cleft close to the predicted catalytic Lys-171, revealing the molecular details of the PA0743 substrate-binding site. The structure of the PA0743-NAD(+) complex demonstrated that the opposite side of the enzyme active site accommodates the cofactor, which is also bound near Lys-171. Site-directed mutagenesis of PA0743 emphasized the critical role of four amino acid residues in catalysis including the primary catalytic residue Lys-171. Our results provide further insight into the molecular mechanisms of substrate selectivity and activity of β-hydroxyacid dehydrogenases.

  • Organizational Affiliation

    Department of Chemical Engineering, University of Toronto, Toronto, Ontario M5G 1L6, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Probable 3-hydroxyisobutyrate dehydrogenase300Pseudomonas aeruginosaMutation(s): 0 
Gene Names: PA0743
Find proteins for Q9I5I6 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I5I6 
Go to UniProtKB:  Q9I5I6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I5I6
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 62 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.611α = 90
b = 92.611β = 90
c = 124.86γ = 120
Software Package:
Software NamePurpose
SBC-Collectdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-11-23
    Changes: Database references
  • Version 1.3: 2012-02-01
    Changes: Database references
  • Version 1.4: 2017-10-25
    Changes: Author supporting evidence