1CC3

PURPLE CUA CENTER


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of electron transfer modulation in the purple CuA center.

Robinson, H.Ang, M.C.Gao, Y.G.Hay, M.T.Lu, Y.Wang, A.H.

(1999) Biochemistry 38: 5677-5683

  • DOI: 10.1021/bi9901634

  • PubMed Abstract: 
  • The X-ray structure of an engineered purple CuA center in azurin from Pseudomonas aeruginosa has been determined and refined at 1.65 A resolution. Two independent purple CuA azurin molecules are in the asymmetric unit of a new P21 crystal, and they h ...

    The X-ray structure of an engineered purple CuA center in azurin from Pseudomonas aeruginosa has been determined and refined at 1.65 A resolution. Two independent purple CuA azurin molecules are in the asymmetric unit of a new P21 crystal, and they have nearly identical conformations (rmsd of 0.27 A for backbone atoms). The purple CuA azurin was produced by the loop-engineering strategy, and the resulting overall structure is unperturbed. The insertion of a slightly larger Cu-binding loop into azurin causes the two structural domains of azurin to move away from each other. The high-resolution structure reveals the detailed environment of the delocalized mixed-valence [Cu(1.5).Cu(1.5)] binuclear purple CuA center, which serves as a useful reference model for other native proteins, and provides a firm basis for understanding results from spectroscopic and functional studies of this class of copper center in biology. The two independent Cu-Cu distances of 2.42 and 2.35 A (with respective concomitant adjustments of ligand-Cu distances) are consistent with that (2.39 A) obtained from X-ray absorption spectroscopy with the same molecule, and are among the shortest Cu-Cu bonds observed to date in proteins or inorganic complexes. A comparison of the purple CuA azurin structure with those of other CuA centers reveals an important relationship between the angular position of the two His imidazole rings with respect to the Cu2S2(Cys) core plane and the distance between the Cu and the axial ligand. This relationship strongly suggests that the fine structural variation of different CuA centers can be correlated with the angular positions of the two histidine rings because, from these positions, one can predict the relative axial ligand interactions, which are responsible for modulating the Cu-Cu distance and the electron transfer properties of the CuA centers.


    Organizational Affiliation

    Department of Cell and Structural Biology, University of Illinois at Urbana-Champaign 61801, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (CUA AZURIN)
A, B
130Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228)Gene Names: azu
Find proteins for P00282 (Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228))
Go to UniProtKB:  P00282
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CU
Query on CU

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 35.630α = 90.00
b = 62.332β = 99.50
c = 51.230γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
SHELXL-97refinement
X-PLORphasing
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-12-23
    Type: Initial release
  • Version 1.1: 2008-04-26
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance