4UTP

Crystal structure of pneumococcal surface antigen PsaA in the Cd- bound, closed state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.221 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Dysregulation of transition metal ion homeostasis is the molecular basis for cadmium toxicity in Streptococcus pneumoniae.

Begg, S.L.Eijkelkamp, B.A.Luo, Z.Counago, R.M.Morey, J.R.Maher, M.J.Ong, C.L.McEwan, A.G.Kobe, B.O'Mara, M.L.Paton, J.C.McDevitt, C.A.

(2015) Nat Commun 6: 6418-6418

  • DOI: 10.1038/ncomms7418
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cadmium is a transition metal ion that is highly toxic in biological systems. Although relatively rare in the Earth's crust, anthropogenic release of cadmium since industrialization has increased biogeochemical cycling and the abundance of the ion in ...

    Cadmium is a transition metal ion that is highly toxic in biological systems. Although relatively rare in the Earth's crust, anthropogenic release of cadmium since industrialization has increased biogeochemical cycling and the abundance of the ion in the biosphere. Despite this, the molecular basis of its toxicity remains unclear. Here we combine metal-accumulation assays, high-resolution structural data and biochemical analyses to show that cadmium toxicity, in Streptococcus pneumoniae, occurs via perturbation of first row transition metal ion homeostasis. We show that cadmium uptake reduces the millimolar cellular accumulation of manganese and zinc, and thereby increases sensitivity to oxidative stress. Despite this, high cellular concentrations of cadmium (~17 mM) are tolerated, with negligible impact on growth or sensitivity to oxidative stress, when manganese and glutathione are abundant. Collectively, this work provides insight into the molecular basis of cadmium toxicity in prokaryotes, and the connection between cadmium accumulation and oxidative stress.


    Organizational Affiliation

    1] School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia [2] Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland 4072, Australia.,1] School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia [2] School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia.,1] School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, Queensland 4072, Australia [2] Australian Infectious Diseases Research Centre, University of Queensland, Brisbane, Queensland 4072, Australia [3] Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland 4072, Australia.,La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia.,Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 4072, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MANGANESE ABC TRANSPORTER SUBSTRATE-BINDING LIPOPROTEIN
A, B
314Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)Mutation(s): 0 
Gene Names: psaA
Find proteins for P0A4G2 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Go to UniProtKB:  P0A4G2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CD
Query on CD

Download SDF File 
Download CCD File 
A, B
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.221 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.239α = 90.00
b = 47.911β = 106.96
c = 101.524γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
REFMACphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2015-03-11
    Type: Database references
  • Version 1.2: 2018-03-28
    Type: Database references, Structure summary