1QQ5

STRUCTURE OF L-2-HALOACID DEHALOGENASE FROM XANTHOBACTER AUTOTROPHICUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.52 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structures of intermediates in the dehalogenation of haloalkanoates by L-2-haloacid dehalogenase.

Ridder, I.S.Rozeboom, H.J.Kalk, K.H.Dijkstra, B.W.

(1999) J Biol Chem 274: 30672-30678

  • DOI: 10.1074/jbc.274.43.30672
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The L-2-haloacid dehalogenase from the 1,2-dichloroethane-degrading bacterium Xanthobacter autotrophicus GJ10 catalyzes the hydrolytic dehalogenation of small L-2-haloalkanoates to their corresponding D-2-hydroxyalkanoates, with inversion of the conf ...

    The L-2-haloacid dehalogenase from the 1,2-dichloroethane-degrading bacterium Xanthobacter autotrophicus GJ10 catalyzes the hydrolytic dehalogenation of small L-2-haloalkanoates to their corresponding D-2-hydroxyalkanoates, with inversion of the configuration at the C(2) atom. The structure of the apoenzyme at pH 8 was refined at 1.5-A resolution. By lowering the pH, the catalytic activity of the enzyme was considerably reduced, allowing the crystal structure determination of the complexes with L-2-monochloropropionate and monochloroacetate at 1.7 and 2.1 A resolution, respectively. Both complexes showed unambiguous electron density extending from the nucleophile Asp(8) to the C(2) atom of the dechlorinated substrates corresponding to a covalent enzyme-ester reaction intermediate. The halide ion that is cleaved off is found in line with the Asp(8) Odelta1-C(2) bond in a halide-stabilizing cradle made up of Arg(39), Asn(115), and Phe(175). In both complexes, the Asp(8) Odelta2 carbonyl oxygen atom interacts with Thr(12), Ser(171), and Asn(173), which possibly constitute the oxyanion hole in the hydrolysis of the ester bond. The carboxyl moiety of the substrate is held in position by interactions with Ser(114), Lys(147), and main chain NH groups. The L-2-monochloropropionate CH(3) group is located in a small pocket formed by side chain atoms of Lys(147), Asn(173), Phe(175), and Asp(176). The size and position of the pocket explain the stereospecificity and the limited substrate specificity of the enzyme. These crystallographic results demonstrate that the reaction of the enzyme proceeds via the formation of a covalent enzyme-ester intermediate at the nucleophile Asp(8).


    Related Citations: 
    • Three-Dimensional Structure of L-2-Haloacid Dehalogenase from Xanthobacter Autotrophicus Gj10 Complexed with the Substrate-Analogue Formate
      Ridder, I.S., Rozeboom, H.J., Kalk, K.H., Janssen, D.B., Dijkstra, B.W.
      (1997) J Biol Chem 272: 33015
    • Crystallization and Preliminary X-Ray Analysis of L-2-Haloacid Dehalogenase from Xanthobacter Autotrophicus Gj10
      Ridder, I.S., Rozeboom, H.J., Kingma, J., Janssen, D.B., Dijkstra, B.W.
      (1995) Protein Sci 4: 2619

    Organizational Affiliation

    Laboratory of Biophysical Chemistry, BIOSON Research Institute, Department of Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (L-2-HALOACID DEHALOGENASE)A, B253Xanthobacter autotrophicusMutation(s): 0 
Gene Names: dhlB
EC: 3.8.1.2
Find proteins for Q60099 (Xanthobacter autotrophicus)
Explore Q60099 
Go to UniProtKB:  Q60099
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMT
Query on FMT

Download CCD File 
A, B
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.52 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.05α = 90
b = 83.928β = 90
c = 91.227γ = 90
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-10-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance