Crystal structure of pneumococcal surface antigen PsaA D280N in the Cd-bound, open state

Experimental Data Snapshot

  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.181 

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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: https://doi.org/10.1038/ncomms7418
  • Primary Citation of Related Structures:  
    4UTO, 4UTP

  • 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 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

    Research Centre for Infectious Diseases, School of Biological Sciences, The University of Adelaide, Adelaide, South Australia 4072, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
309Streptococcus pneumoniaeMutation(s): 1 
Find proteins for P0A4G2 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4))
Explore P0A4G2 
Go to UniProtKB:  P0A4G2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A4G2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.55 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.181 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.737α = 106.86
b = 59.292β = 104.9
c = 62.468γ = 93.37
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-11
    Type: Initial release
  • Version 2.0: 2018-03-28
    Changes: Atomic model, Data collection, Database references, Structure summary
  • Version 2.1: 2024-01-10
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description