Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 8.90 kDa 
• Atom Count: 796 
• Modelled Residue Count: 80 
• Deposited Residue Count: 80 
• Unique protein chains: 1

3E6Z

1.0 A Structure of CusF-W44A-Cu(II) residues 10-88 from Escherichia coli

• PDB DOI: 10.2210/pdb3E6Z/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2008-08-17 Released: 2009-07-07 
• Deposition Author(s): Loftin, I.R.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.00 Å
• R-Value Free: 0.214 
• R-Value Work: 0.194 
• R-Value Observed: 0.195 

Literature

Tryptophan Cu(I)-pi interaction fine-tunes the metal binding properties of the bacterial metallochaperone CusF

Loftin, I.R., Blackburn, N.J., McEvoy, M.M.

(2009) J Biol Inorg Chem 14: 905-912

• PubMed: 19381697 
• DOI: 10.1007/s00775-009-0503-y
• Primary Citation of Related Structures:  
  3E6Z


• PubMed Abstract: 
  

The periplasmic metallochaperone CusF coordinates Cu(I) and Ag(I) through a unique site consisting of a Met(2)His motif as well as a Cu(I)-pi interaction between a nearby tryptophan, W44, and the metal ion. Through mutational analyses we investigate here the role that W44 in CusF plays in metal coordination. Nuclear magnetic resonance spectra show that the specificity of CusF for Cu(I) and Ag(I) is not altered by mutation of W44. X-ray absorption spectroscopy studies reveal that W44 protects the bound Cu(I) from oxidation as well as from adventitious ligands. Competition assays demonstrate that W44 does not significantly contribute to the affinity of CusF for metal, but that substitution of W44 by methionine, which forms a fourth Cu(I) ligand, substantially increases the affinity. These studies indicate that W44 is important in maintaining a moderate-affinity and solvent-shielded three-coordinate environment for Cu(I), which has implications for the function of CusF as a metallochaperone.

---

Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cation efflux system protein cusF	A [auth X]	80	Escherichia coli	Mutation(s): 1  Gene Names: cusF, cusX, ylcC
UniProt
Find proteins for P77214 (Escherichia coli (strain K12)) Explore P77214  Go to UniProtKB:  P77214

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CU	B [auth X]	COPPER (II) ION Cu JPVYNHNXODAKFH-UHFFFAOYSA-N
ACT	C [auth X]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.00 Å
• R-Value Free: 0.214 
• R-Value Work: 0.194 
• R-Value Observed: 0.195 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 26.272	α = 90
b = 31.615	β = 90
c = 84.685	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
Blu-Ice	data collection
CrystalClear	data reduction
SCALA	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-08-17 
• Released Date: 2009-07-07 
Deposition Author(s): Loftin, I.R.

Revision History  

• Version 1.0: 2009-07-07
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2017-10-25
  Changes: Refinement description
• Version 1.3: 2021-10-20
  Changes: Database references, Derived calculations