4A4J

Crosstalk between Cu(I) and Zn(II) homeostasis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.143 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Investigating the Role of Zinc and Copper Binding Motifs of Trafficking Sites in the Cyanobacterium Synechocystis Pcc 6803.

Badarau, A.Basle, A.Firbank, S.J.Dennison, C.

(2013) Biochemistry 52: 6816

  • DOI: 10.1021/bi400492t
  • Primary Citation of Related Structures:  4A47, 4A48

  • PubMed Abstract: 
  • Although zinc and copper are required by proteins with very different functions, these metals can be delivered to cellular locations by homologous metal transporters within the same organism, as demonstrated by the cyanobacterial ( Synechocystis PCC ...

    Although zinc and copper are required by proteins with very different functions, these metals can be delivered to cellular locations by homologous metal transporters within the same organism, as demonstrated by the cyanobacterial ( Synechocystis PCC 6803) zinc exporter ZiaA and thylakoidal copper importer PacS. The N-terminal metal-binding domains of these transporters (ZiaAN and PacSN, respectively) have related ferredoxin folds also found in the metallochaperone Atx1, which delivers copper to PacS, but differ in the residues found in their M/IXCXXC metal-binding motifs. To investigate the role of the nonconserved residues in this region on metal binding, the sequence from ZiaAN has been introduced into Atx1 and PacSN, and the motifs of Atx1 and PacSN swapped. The motif sequence can tune Cu(I) affinity only approximately 3-fold. However, the introduction of the ZiaAN motif (MDCTSC) dramatically increases the Zn(II) affinity of both Atx1 and PacSN by up to 2 orders of magnitude. The Atx1 mutant with the ZiaAN motif crystallizes as a side-to-side homodimer very similar to that found for [Cu(I)2-Atx1]2 ( Badarau et al. Biochemistry 2010 , 49 , 7798 ). In a crystal structure of the PacSN mutant possessing the ZiaAN motif (PacSN(ZiaAN)), the Asp residue from the metal-binding motif coordinates Zn(II). This demonstrates that the increased Zn(II) affinity of this variant and the high Zn(II) affinity of ZiaAN are due to the ability of the carboxylate to ligate this metal ion. Comparison of the Zn(II) sites in PacSN(ZiaAN) structures provides additional insight into Zn(II) trafficking in cyanobacteria.


    Organizational Affiliation

    Institute for Cell and Molecular Biosciences, Medical School, Newcastle University , Newcastle upon Tyne, NE2 4HH, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
COPPER-TRANSPORTING ATPASE PACS
A
69Synechocystis sp. (strain PCC 6803 / Kazusa)Gene Names: pacS
EC: 3.6.3.54
Find proteins for P73241 (Synechocystis sp. (strain PCC 6803 / Kazusa))
Go to UniProtKB:  P73241
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.143 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 22.780α = 90.00
b = 58.040β = 112.82
c = 24.780γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
SCALAdata scaling
iMOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-12-12
    Type: Initial release
  • Version 1.1: 2013-11-20
    Type: Database references, Other, Structure summary