3PWQ

The Phenylacetyl-CoA monooxygenase PaaAC subcomplex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Functional Studies of the Escherichia coli Phenylacetyl-CoA Monooxygenase Complex.

Grishin, A.M.Ajamian, E.Tao, L.Zhang, L.Menard, R.Cygler, M.

(2011) J.Biol.Chem. 286: 10735-10743

  • DOI: 10.1074/jbc.M110.194423
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The utilization of phenylacetic acid (PA) in Escherichia coli occurs through a hybrid pathway that shows features of both aerobic and anaerobic metabolism. Oxygenation of the aromatic ring is performed by a multisubunit phenylacetyl-coenzyme A oxygen ...

    The utilization of phenylacetic acid (PA) in Escherichia coli occurs through a hybrid pathway that shows features of both aerobic and anaerobic metabolism. Oxygenation of the aromatic ring is performed by a multisubunit phenylacetyl-coenzyme A oxygenase complex that shares remote homology of two subunits to well studied bacterial multicomponent monooxygenases and was postulated to form a new bacterial multicomponent monooxygenase subfamily. We expressed the subunits PaaA, B, C, D, and E of the PA-CoA oxygenase and showed that PaaABC, PaaAC, and PaaBC form stable subcomplexes that can be purified. In vitro reconstitution of the oxygenase subunits showed that each of the PaaA, B, C, and E subunits are necessary for catalysis, whereas PaaD is not essential. We have determined the crystal structure of the PaaAC complex in a ligand-free form and with several CoA derivatives. We conclude that PaaAC forms a catalytic core with a monooxygenase fold with PaaA being the catalytic α subunit and PaaC, the structural β subunit. PaaAC forms heterotetramers that are organized very differently from other known multisubunit monooxygenases and lacks their conservative network of hydrogen bonds between the di-iron center and protein surface, suggesting different association with the reductase and different mechanisms of electron transport. The PaaA structure shows adaptation of the common access route to the active site for binding a CoA-bound substrate. The enzyme-substrate complex shows the orientation of the aromatic ring, which is poised for oxygenation at the ortho-position, in accordance with the expected chemistry. The PA-CoA oxygenase complex serves as a paradigm for the new subfamily multicomponent monooxygenases comprising several hundred homologs.


    Organizational Affiliation

    Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phenylacetic acid degradation protein paaC
A, B, E, G, I, J, K, R
259Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: paaC (ydbP)
Find proteins for P76079 (Escherichia coli (strain K12))
Go to UniProtKB:  P76079
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Phenylacetic acid degradation protein paaA
C, D, F, H
311Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: paaA (ydbO)
EC: 1.14.13.149
Find proteins for P76077 (Escherichia coli (strain K12))
Go to UniProtKB:  P76077
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.234 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 110.257α = 90.00
b = 109.062β = 90.00
c = 305.926γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
HKL-2000data reduction
MOLREPphasing
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance