1KV7

Crystal Structure of CueO, a multi-copper oxidase from E. coli involved in copper homeostasis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure and electron transfer kinetics of CueO, a multicopper oxidase required for copper homeostasis in Escherichia coli.

Roberts, S.A.Weichsel, A.Grass, G.Thakali, K.Hazzard, J.T.Tollin, G.Rensing, C.Montfort, W.R.

(2002) Proc.Natl.Acad.Sci.USA 99: 2766-2771

  • DOI: 10.1073/pnas.052710499

  • PubMed Abstract: 
  • CueO (YacK), a multicopper oxidase, is part of the copper-regulatory cue operon in Escherichia coli. The crystal structure of CueO has been determined to 1.4-A resolution by using multiple anomalous dispersion phasing and an automated building proced ...

    CueO (YacK), a multicopper oxidase, is part of the copper-regulatory cue operon in Escherichia coli. The crystal structure of CueO has been determined to 1.4-A resolution by using multiple anomalous dispersion phasing and an automated building procedure that yielded a nearly complete model without manual intervention. This is the highest resolution multicopper oxidase structure yet determined and provides a particularly clear view of the four coppers at the catalytic center. The overall structure is similar to those of laccase and ascorbate oxidase, but contains an extra 42-residue insert in domain 3 that includes 14 methionines, nine of which lie in a helix that covers the entrance to the type I (T1, blue) copper site. The trinuclear copper cluster has a conformation not previously seen: the Cu-O-Cu binuclear species is nearly linear (Cu-O-Cu bond angle = 170 degrees) and the third (type II) copper lies only 3.1 A from the bridging oxygen. CueO activity was maximal at pH 6.5 and in the presence of >100 microM Cu(II). Measurements of intermolecular and intramolecular electron transfer with laser flash photolysis in the absence of Cu(II) show that, in addition to the normal reduction of the T1 copper, which occurs with a slow rate (k = 4 x 10(7) M(-1)x (-1)), a second electron transfer process occurs to an unknown site, possibly the trinuclear cluster, with k = 9 x 10(7) M(-1) x (-1), followed by a slow intramolecular electron transfer to T1 copper (k approximately 10 s(-1)). These results suggest the methionine-rich helix blocks access to the T1 site in the absence of excess copper.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, University of Arizona, Tucson, AZ 85721, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROBABLE BLUE-COPPER PROTEIN YACK
A
488Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: cueO (yacK)
Find proteins for P36649 (Escherichia coli (strain K12))
Go to UniProtKB:  P36649
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C2O
Query on C2O

Download SDF File 
Download CCD File 
A
CU-O-CU LINKAGE
Cu2 O
BERDEBHAJNAUOM-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

Download SDF File 
Download CCD File 
A
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.820α = 90.00
b = 90.510β = 102.90
c = 53.090γ = 90.00
Software Package:
Software NamePurpose
d*TREKdata scaling
MLPHAREphasing
SHELXL-97refinement
DMphasing
Blu-Icedata collection
DMmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-02-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance