2Y4O

Crystal Structure of PaaK2 in complex with phenylacetyl adenylate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Defining a Structural and Kinetic Rationale for Paralogous Copies of Phenylacetate-Coa Ligases from the Cystic Fibrosis Pathogen Burkholderia Cenocepacia J2315.

Law, A.Boulanger, M.J.

(2011) J Biol Chem 286: 15577

  • DOI: https://doi.org/10.1074/jbc.M111.219683
  • Primary Citation of Related Structures:  
    2Y27, 2Y4N, 2Y4O

  • PubMed Abstract: 

    The phenylacetic acid (PAA) degradation pathway is the sole aerobic route for phenylacetic acid metabolism in bacteria and facilitates degradation of environmental pollutants such as styrene and ethylbenzene. The PAA pathway also is implicated in promoting Burkholderia cenocepacia infections in cystic fibrosis patients. Intriguingly, the first enzyme in the PAA pathway is present in two copies (paaK1 and paaK2), yet each subsequent enzyme is present in only a single copy. Furthermore, sequence divergence indicates that PaaK1 and PaaK2 form a unique subgroup within the adenylate-forming enzyme (AFE) superfamily. To establish a biochemical rationale for the existence of the PaaK paralogs in B. cenocepacia, we present high resolution x-ray crystal structures of a selenomethionine derivative of PaaK1 in complex with ATP and adenylated phenylacetate intermediate complexes of PaaK1 and PaaK2 in distinct conformations. Structural analysis reveals a novel N-terminal microdomain that may serve to recruit subsequent PAA enzymes, whereas a bifunctional role is proposed for the P-loop in stabilizing the C-terminal domain in conformation 2. The potential for different kinetic profiles was suggested by a structurally divergent extension of the aryl substrate pocket in PaaK1 relative to PaaK2. Functional characterization confirmed this prediction, with PaaK1 possessing a lower K(m) for phenylacetic acid and better able to accommodate 3' and 4' substitutions on the phenyl ring. Collectively, these results offer detailed insight into the reaction mechanism of a novel subgroup of the AFE superfamily and provide a clear biochemical rationale for the presence of paralogous copies of PaaK of B. cenocepacia.


  • Organizational Affiliation

    Department of Biochemistry & Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PHENYLACETATE-COENZYME A LIGASE
A, B
443Burkholderia cenocepacia J2315Mutation(s): 0 
EC: 6.2.1.30
UniProt
Find proteins for B4EL89 (Burkholderia cenocepacia (strain ATCC BAA-245 / DSM 16553 / LMG 16656 / NCTC 13227 / J2315 / CF5610))
Explore B4EL89 
Go to UniProtKB:  B4EL89
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB4EL89
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
DLL
Query on DLL

Download Ideal Coordinates CCD File 
E [auth A],
F [auth B]
5'-O-[HYDROXY(PHENYLACETYL)PHOSPHORYL]ADENOSINE
C18 H20 N5 O8 P
VUKDZGAUWUDQRZ-XKLVTHTNSA-N
PEG
Query on PEG

Download Ideal Coordinates CCD File 
G [auth B],
H [auth B],
I [auth B],
J [auth B],
K [auth B]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
BME
Query on BME

Download Ideal Coordinates CCD File 
L [auth B]BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
K
Query on K

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D [auth A],
N [auth B]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth A],
M [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.15α = 90
b = 81.97β = 97.27
c = 80.89γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
iMOSFLMdata reduction
SCALAdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description