2VB3

Crystal structure of Ag(I)CusF

• PDB DOI: https://doi.org/10.2210/pdb2VB3/pdb

• Classification: METAL TRANSPORT
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2007-09-06 Released: 2007-12-18 
• Deposition Author(s): Xue, Y., Davis, A.V., Balakrishnan, G., Stasser, J.P., Staehlin, B.M., Focia, P., Spiro, T.G., Penner-Hahn, J.E., O'Halloran, T.V.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.33 Å
• R-Value Free: 0.264 
• R-Value Work: 0.241 
• R-Value Observed: 0.242 

Literature

Cu(I) Recognition Via Cation-Pi and Methionine Interactions in Cusf.

Xue, Y., Davis, A.V., Balakrishnan, G., Stasser, J.P., Staehlin, B.M., Focia, P., Spiro, T.G., Penner-Hahn, J.E., O'Halloran, T.V.

(2008) Nat Chem Biol 4: 107

• PubMed: 18157124 
• DOI: https://doi.org/10.1038/nchembio.2007.57
• Primary Citation of Related Structures:  
  2VB2, 2VB3


• PubMed Abstract: 
  

  Methionine-rich motifs have an important role in copper trafficking factors, including the CusF protein. Here we show that CusF uses a new metal recognition site wherein Cu(I) is tetragonally displaced from a Met2His ligand plane toward a conserved tryptophan. Spectroscopic studies demonstrate that both thioether ligation and strong cation-pi interactions with tryptophan stabilize metal binding. This novel active site chemistry affords mechanisms for control of adventitious metal redox and substitution chemistry.

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Organizational Affiliation: 

Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 9.97 kDa 
• Atom Count: 601 
• Modelled Residue Count: 76 
• Deposited Residue Count: 88 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CATION EFFLUX SYSTEM PROTEIN CUSF	A [auth X]	88	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for P77214 (Escherichia coli (strain K12)) Explore P77214  Go to UniProtKB:  P77214

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AG	B [auth X]	SILVER ION Ag FOIXSVOLVBLSDH-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.33 Å
• R-Value Free: 0.264 
• R-Value Work: 0.241 
• R-Value Observed: 0.242 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 39.658	α = 90
b = 44.229	β = 90
c = 44.241	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2007-12-18 
Deposition Author(s): Xue, Y., Davis, A.V., Balakrishnan, G., Stasser, J.P., Staehlin, B.M., Focia, P., Spiro, T.G., Penner-Hahn, J.E., O'Halloran, T.V.

Revision History  

• Version 1.0: 2007-12-18
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2023-12-13
  Changes: Data collection, Database references, Refinement description