Solution structure of the C-terminal domain of SilB from Cupriavidus metallidurans

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Structural and Metal Binding Characterization of the C-Terminal Metallochaperone Domain of Membrane Fusion Protein SilB from Cupriavidus metallidurans CH34.

Bersch, B.Derfoufi, K.M.De Angelis, F.Auquier, V.Ngonlong Ekende, E.Mergeay, M.Ruysschaert, J.M.Vandenbussche, G.

(2011) Biochemistry 50: 2194-2204

  • DOI: https://doi.org/10.1021/bi200005k
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Detoxification of heavy metal ions in Proteobacteria is tightly controlled by various systems regulating their sequestration and transport. In Cupriavidus metallidurans CH34, a model organism for heavy metal resistance studies, the sil determinant is potentially involved in the efflux of silver and copper ions. Proteins SilA, SilB, and SilC form a resistance nodulation cell division (RND)-based transport system in which SilB is the periplasmic adaptor protein belonging to the membrane fusion protein (MFP) family. In addition to the four domains typical of known MFPs, SilB has a fifth additional C-terminal domain, called SilB(440-521), which is characterized here. Structure and backbone dynamics of SilB(440-521) have been investigated using nuclear magnetic resonance, and the residues of the metal site were identified from (15)N- and (13)C-edited HSQC spectra. The solution structure and additional metal binding experiments demonstrated that this C-terminal domain folds independently of the rest of the protein and has a conformation and a Ag(+) and Cu(+) binding specificity similar to those determined for CusF from Escherichia coli. The small protein CusF plays a role in metal trafficking in the periplasm. The similarity with CusF suggests a potential metallochaperone role for SilB(440-521) that is discussed in the context of simultaneous expression of different determinants involved in copper resistance in C. metallidurans CH34.

  • Organizational Affiliation

    CNRS, Institut de Biologie Structurale Jean-Pierre Ebel, Grenoble, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SilB,Silver efflux protein, MFP component of the three components proton antiporter metal efflux system82Cupriavidus metallidurans CH34Mutation(s): 0 
Gene Names: Rmet_6135silB
Find proteins for Q58AF3 (Cupriavidus metallidurans (strain ATCC 43123 / DSM 2839 / NBRC 102507 / CH34))
Explore Q58AF3 
Go to UniProtKB:  Q58AF3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ58AF3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-02-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-02-05
    Changes: Data collection, Other
  • Version 1.3: 2023-06-14
    Changes: Database references, Other