4HA0

Structure of Geobacillus kaustophilus lactonase, mutant R230D with Zn2+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.261 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural evidence of a productive active site architecture for an evolved quorum-quenching GKL lactonase.

Xue, B.Chow, J.Y.Baldansuren, A.Yap, L.L.Gan, Y.H.Dikanov, S.A.Robinson, R.C.Yew, W.S.

(2013) Biochemistry 52: 2359-2370

  • DOI: https://doi.org/10.1021/bi4000904
  • Primary Citation of Related Structures:  
    4H9T, 4H9U, 4H9V, 4H9X, 4H9Y, 4H9Z, 4HA0

  • PubMed Abstract: 

    The in vitro evolution and engineering of quorum-quenching lactonases with enhanced reactivities was achieved using a thermostable GKL enzyme as a template, yielding the E101G/R230C GKL mutant with increased catalytic activity and a broadened substrate range [Chow, J. Y., Xue, B., Lee, K. H., Tung, A., Wu, L., Robinson, R. C., and Yew, W. S. (2010) J. Biol. Chem. 285, 40911-40920]. This enzyme possesses the (β/α)8-barrel fold and is a member of the PLL (phosphotriesterase-like lactonase) group of enzymes within the amidohydrolase superfamily that hydrolyze N-acyl-homoserine lactones, which mediate the quorum-sensing pathways of bacteria. The structure of the evolved N-butyryl-l-homoserine lactone (substrate)-bound E101G/R230C GKL enzyme was determined, in the presence of the inactivating D266N mutation, to a resolution of 2.2 Å to provide an explanation for the observed rate enhancements. In addition, the substrate-bound structure of the catalytically inactive E101N/D266N mutant of the manganese-reconstituted enzyme was determined to a resolution of 2.1 Å and the structure of the ligand-free, manganese-reconstituted E101N mutant to a resolution of 2.6 Å, and the structures of ligand-free zinc-reconstituted wild-type, E101N, R230D, and E101G/R230C mutants of GKL were determined to resolutions of 2.1, 2.1, 1.9, and 2.0 Å, respectively. In particular, the structure of the evolved E101G/R230C mutant of GKL provides evidence of a catalytically productive active site architecture that contributes to the observed enhancement of catalysis. At high concentrations, wild-type and mutant GKL enzymes are differentially colored, with absorbance maxima in the range of 512-553 nm. The structures of the wild-type and mutant GKL provide a tractable link between the origins of the coloration and the charge-transfer complex between the α-cation and Tyr99 within the enzyme active site. Taken together, this study provides evidence of the modulability of enzymatic catalysis through subtle changes in enzyme active site architecture.


  • Organizational Affiliation

    Institute of Molecular and Cell Biology, 61 Biopolis Drive, Singapore 138673.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphotriesterase
A, B
330Geobacillus kaustophilus HTA426Mutation(s): 1 
Gene Names: GK1506
EC: 3.5
UniProt
Find proteins for Q5KZU5 (Geobacillus kaustophilus (strain HTA426))
Explore Q5KZU5 
Go to UniProtKB:  Q5KZU5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5KZU5
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
KCX
Query on KCX
A, B
L-PEPTIDE LINKINGC7 H14 N2 O4LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.303 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.261 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.974α = 90
b = 76.218β = 90
c = 134.765γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
DENZOdata reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-11-07
    Type: Initial release
  • Version 1.1: 2013-05-22
    Changes: Database references