2L55 image
Deposition Date 2010-10-25
Release Date 2011-02-23
Last Version Date 2024-05-15
Entry Detail
PDB ID:
2L55
Title:
Solution structure of the C-terminal domain of SilB from Cupriavidus metallidurans
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
1000
Conformers Submitted:
20
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:SilB,Silver efflux protein, MFP component of the three components proton antiporter metal efflux system
Gene (Uniprot):silB
Chain IDs:A
Chain Length:82
Number of Molecules:1
Biological Source:Cupriavidus metallidurans
Ligand Molecules
Primary Citation
Structural and Metal Binding Characterization of the C-Terminal Metallochaperone Domain of Membrane Fusion Protein SilB from Cupriavidus metallidurans CH34.
Biochemistry 50 2194 2204 (2011)
PMID: 21299248 DOI: 10.1021/bi200005k

Abstact

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.

Legend

Protein

Chemical

Disease

Primary Citation of related structures