3MFQ

A Glance into the Metal Binding Specificity of TroA: Where Elaborate Behaviors Occur in the Active Center


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.232 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Insight into the interaction of metal ions with TroA from Streptococcus suis

Zheng, B.Zhang, Q.Gao, J.Han, H.Li, M.Zhang, J.Qi, J.Yan, J.Gao, G.F.

(2011) PLoS One 6: e19510-e19510

  • DOI: https://doi.org/10.1371/journal.pone.0019510
  • Primary Citation of Related Structures:  
    3MFQ

  • PubMed Abstract: 

    The scavenging ability of sufficient divalent metal ions is pivotal for pathogenic bacteria to survive in the host. ATP-binding cassette (ABC)-type metal transporters provide a considerable amount of different transition metals for bacterial growth. TroA is a substrate binding protein for uptake of multiple metal ions. However, the function and structure of the TroA homologue from the epidemic Streptococcus suis isolates (SsTroA) have not been characterized. Here we determined the crystal structure of SsTroA from a highly pathogenic streptococcal toxic shock syndrome (STSS)-causing Streptococcus suis in complex with zinc. Inductively coupled plasma mass spectrometry (ICP-MS) analysis revealed that apo-SsTroA binds Zn(2+) and Mn(2+). Both metals bind to SsTroA with nanomolar affinity and stabilize the protein against thermal unfolding. Zn(2+) and Mn(2+) induce distinct conformational changes in SsTroA compared with the apo form as confirmed by both circular dichroism (CD) and nuclear magnetic resonance (NMR) spectra. NMR data also revealed that Zn(2+)/Mn(2+) bind to SsTroA in either the same site or an adjacent region. Finally, we found that the folding of the metal-bound protein is more compact than the corresponding apoprotein. Our findings reveal a mechanism for uptake of metal ions in S. suis and this mechanism provides a reasonable explanation as to how SsTroA operates in metal transport.


  • Organizational Affiliation

    CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
High-affinity zinc uptake system protein znuA
A, B, C
282Streptococcus suis 05ZYH33Mutation(s): 0 
Gene Names: SSU05_2086
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.232 
  • Space Group: P 43
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 102.36α = 90
b = 102.36β = 90
c = 107.333γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-04-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-08-24
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description