1R8W

Native structure of the B12-independent glycerol dehydratase from clostridium butyricum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.171 

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This is version 1.2 of the entry. See complete history


Literature

Insight into the mechanism of the B12-independent glycerol dehydratase from Clostridium butyricum: preliminary biochemical and structural characterization.

O'Brien, J.R.Raynaud, C.Croux, C.Girbal, L.Soucaille, P.Lanzilotta, W.N.

(2004) Biochemistry 43: 4635-4645

  • DOI: 10.1021/bi035930k
  • Primary Citation of Related Structures:  
    1R8W, 1R9D

  • PubMed Abstract: 
  • The molecular characterization of a B12-independent glycerol dehydratase from Clostridium butyricum has recently been reported [Raynaud, C., et al. (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 5010-5015]. In this work, we have further characterized this system by biochemical and crystallographic methods ...

    The molecular characterization of a B12-independent glycerol dehydratase from Clostridium butyricum has recently been reported [Raynaud, C., et al. (2003) Proc. Natl. Acad. Sci. U.S.A. 100, 5010-5015]. In this work, we have further characterized this system by biochemical and crystallographic methods. Both the glycerol dehydratase (GD) and the GD-activating enzyme (GD-AE) could be purified to homogeneity under aerobic conditions. In this form, both the GD and GD-AE were inactive. A reconstitution procedure, similar to what has been reported for pyruvate formate lyase activating enzyme (PFL-AE), was employed to reconstitute the activity of the GD-AE. Subsequently, the reconstituted GD-AE could be used to reactivate the GD under strictly anaerobic conditions. We also report here the crystal structure of the inactive GD in the native (2.5 A resolution, Rcryst = 17%, Rfree = 20%), glycerol-bound (1.8 A resolution, Rcryst = 21%, Rfree = 24%), and 1,2-propanediol-bound (2.4 A resolution, Rcryst = 20%, Rfree = 24%) forms. The overall fold of the GD monomer was similar to what has been observed for pyruvate formate lyase (PFL) and anaerobic ribonucleotide reductase (ARNR), consisting of a 10-stranded beta/alpha barrel motif. Clear density was observed for both substrates, and a mechanism for the dehydration reaction is presented. This mechanism clearly supports a concerted pathway for migration of the OH group through a cyclic transition state that is stabilized by partial protonation of the migrating OH group. Finally, despite poor alignment (rmsd approximately 6.8 A) of the 10 core strands that comprise the barrel structure of the GD and PFL, the C-terminal domains of both proteins align well (rmsd approximately 0.7 A) and have structural properties consistent with this being the docking site for the activating enzyme. A single point mutation within this domain, at a strictly conserved arginine residue (R782K) in the GD, resulted in formation of a tight protein-protein complex between the GD and the GD-AE in vivo, thereby supporting this hypothesis.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
glycerol dehydrataseA, B787Clostridium butyricumMutation(s): 0 
Gene Names: dhaB1EBQ27_00705
UniProt
Find proteins for Q8GEZ8 (Clostridium butyricum)
Explore Q8GEZ8 
Go to UniProtKB:  Q8GEZ8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.171 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.434α = 90
b = 212.912β = 90
c = 199.498γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-01
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance