1HYH

CRYSTAL STRUCTURE OF L-2-HYDROXYISOCAPROATE DEHYDROGENASE FROM LACTOBACILLUS CONFUSUS AT 2.2 ANGSTROMS RESOLUTION-AN EXAMPLE OF STRONG ASYMMETRY BETWEEN SUBUNITS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.250 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of L-2-hydroxyisocaproate dehydrogenase from Lactobacillus confusus at 2.2 A resolution. An example of strong asymmetry between subunits.

Niefind, K.Hecht, H.J.Schomburg, D.

(1995) J.Mol.Biol. 251: 256-281


  • PubMed Abstract: 
  • L-2-Hydroxyisocaproate dehydrogenase (L-HicDH) from Lactobacillus confusus, a homotetramer with a molecular mass of 33 kDa per subunit, belongs to the protein family of the NAD(+)-dependent L-2-hydroxycarboxylate dehydrogenases. L-HicDH was crystalli ...

    L-2-Hydroxyisocaproate dehydrogenase (L-HicDH) from Lactobacillus confusus, a homotetramer with a molecular mass of 33 kDa per subunit, belongs to the protein family of the NAD(+)-dependent L-2-hydroxycarboxylate dehydrogenases. L-HicDH was crystallized with ammonium sulphate as precipitant in the presence of NAD+. The crystals belong to the trigonal space group P3(2)21, with a = 135.9 A and c = 205.9 A, and diffract X-rays to 2.2 A resolution. The crystal structure was solved by Patterson search and molecular replacement techniques and refined to an R-value of 21.4% (2.2 to 8 A). The final structure model contains one NAD+ molecule and one sulphate ion per subunit, with 309 water molecules. An unusual feature of this crystal structure is the deviation of the protein subunits from non-crystallographic symmetry, which is so strong that it can be detected globally by self-rotation calculations in reciprocal space. This asymmetry is especially pronounced in the environment of the active site; it is reflected also in the nicotinamide conformation of NAD+ and allows some conclusions to be drawn about the catalytic mechanism. In this context, an "inner active site loop" is identified as a structural element of fundamental functional importance. Furthermore, with knowledge of the crystal structure of L-HicDH the differences in substrate specificity between L-HicDH and the L-lactate dehydrogenases can be partly explained.


    Related Citations: 
    • L-2-Hydroxyisocaproate Dehydrogenase-A New Enzyme from Lactobacillus Confusus for the Stereospecific Reduction of 2-Ketocarboxylic Acids
      Schuette, H.,Hummel, W.,Kula, M.-R.
      (1984) Appl.Microbiol.Biotechnol. 19: 167
    • Deletion Variants of L-Hydroxyisocaproate Dehydrogenase-Probing Substrate Specificity
      Feil, I.K.,Lerch, H.-P.,Schomburg, D.
      (1994) Eur.J.Biochem. 223: 857
    • Roentgenkristallographische Untersuchungen an Drei Mikrobiellen Enzymen: D-2-Hydroxyisocaproat-Dehydrogenase Aus Lactobacillus Casei, L-2-Hydroxyisocaproat-Dehydrogenase Aus Lactobacillus Confusus, Alkalische Protease Aus Bacillus Alcalophilus(Slash)Variante Q59R (German, with English Summary)
      Niefind, K.
      (1993) Thesis, Technische Universitat Carolo-Wilhelmina Zu Braunschweig --: --
    • Cloning, Sequencing and Expression of the L-2-Hydroxyisocaproate Dehydrogenase-Encoding Gene of Lactobacillus Confusus in Escherichia Coli
      Lerch, H.-P.,Frank, R.,Collins, J.
      (1989) Gene 83: 263


    Organizational Affiliation

    Gesellschaft für Biotechnologische Forschung (GBF), Abteilung Molekulare Strukturforschung, Braunschweig, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
L-2-HYDROXYISOCAPROATE DEHYDROGENASE
A, B, C, D
309Weissella confusaEC: 1.1.1.-
Find proteins for P14295 (Weissella confusa)
Go to UniProtKB:  P14295
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B, C, D
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.250 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 135.900α = 90.00
b = 135.900β = 90.00
c = 205.900γ = 120.00
Software Package:
Software NamePurpose
PROLSQrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-10-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance