4MJ3

Haloalkane dehalogenase DmrA from Mycobacterium rhodesiae JS60


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Biochemical and biophysical characterisation of haloalkane dehalogenases DmrA and DmrB in Mycobacterium strain JS60 and their role in growth on haloalkanes.

Fung, H.K.Gadd, M.S.Drury, T.A.Cheung, S.Guss, J.M.Coleman, N.V.Matthews, J.M.

(2015) Mol Microbiol 97: 439-453

  • DOI: 10.1111/mmi.13039
  • Primary Citation of Related Structures:  
    4MJ3

  • PubMed Abstract: 
  • Haloalkane dehalogenases (HLDs) catalyse the hydrolysis of haloalkanes to alcohols, offering a biological solution for toxic haloalkane industrial wastes. Hundreds of putative HLD genes have been identified in bacterial genomes, but relatively few enzymes have been characterised ...

    Haloalkane dehalogenases (HLDs) catalyse the hydrolysis of haloalkanes to alcohols, offering a biological solution for toxic haloalkane industrial wastes. Hundreds of putative HLD genes have been identified in bacterial genomes, but relatively few enzymes have been characterised. We identified two novel HLDs in the genome of Mycobacterium rhodesiae strain JS60, an isolate from an organochlorine-contaminated site: DmrA and DmrB. Both recombinant enzymes were active against C2-C6 haloalkanes, with a preference for brominated linear substrates. However, DmrA had higher activity against a wider range of substrates. The kinetic parameters of DmrA with 4-bromobutyronitrile as a substrate were Km  = 1.9 ± 0.2 mM, kcat  = 3.1 ± 0.2 s(-1) . DmrB showed the highest activity against 1-bromohexane. DmrA is monomeric, whereas DmrB is tetrameric. We determined the crystal structure of selenomethionyl DmrA to 1.7 Å resolution. A spacious active site and alternate conformations of a methionine side-chain in the slot access tunnel may contribute to the broad substrate activity of DmrA. We show that M. rhodesiae JS60 can utilise 1-iodopropane, 1-iodobutane and 1-bromobutane as sole carbon and energy sources. This ability appears to be conferred predominantly through DmrA, which shows significantly higher levels of upregulation in response to haloalkanes than DmrB.


    Organizational Affiliation

    School of Molecular Bioscience, University of Sydney, Sydney, NSW, 2006, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Haloalkane dehalogenaseA, B, C, D325Mycolicibacterium rhodesiae JS60Mutation(s): 0 
Gene Names: MycrhDRAFT_3907
EC: 3.8.1.5
UniProt
Find proteins for G4I2J6 (Mycolicibacterium rhodesiae JS60)
Explore G4I2J6 
Go to UniProtKB:  G4I2J6
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.22α = 90
b = 79.079β = 92.52
c = 95.761γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-25
    Type: Initial release
  • Version 1.1: 2015-08-19
    Changes: Database references