7MEK

Structure of copper bound to Ycnl


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 

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


Literature

The YcnI protein from Bacillus subtilis contains a copper-binding domain.

Damle, M.S.Singh, A.N.Peters, S.C.Szalai, V.A.Fisher, O.S.

(2021) J Biol Chem 297: 101078-101078

  • DOI: https://doi.org/10.1016/j.jbc.2021.101078
  • Primary Citation of Related Structures:  
    7ME6, 7MEK

  • PubMed Abstract: 

    Bacteria require a precise balance of copper ions to ensure that essential cuproproteins are fully metalated while also avoiding copper-induced toxicity. The Gram-positive bacterium Bacillus subtilis maintains appropriate copper homeostasis in part through the ycn operon. The ycn operon comprises genes encoding three proteins: the putative copper importer YcnJ, the copper-dependent transcriptional repressor YcnK, and the uncharacterized Domain of Unknown Function 1775 (DUF1775) containing YcnI. DUF1775 domains are found across bacterial phylogeny, and bioinformatics analyses indicate that they frequently neighbor domains implicated in copper homeostasis and transport. Here, we investigated whether YcnI can interact with copper and, using electron paramagnetic resonance and inductively coupled plasma-MS, found that this protein can bind a single Cu(II) ion. We determine the structure of both the apo and copper-bound forms of the protein by X-ray crystallography, uncovering a copper-binding site featuring a unique monohistidine brace ligand set that is highly conserved among DUF1775 domains. These data suggest a possible role for YcnI as a copper chaperone and that DUF1775 domains in other bacterial species may also function in copper homeostasis.


  • Organizational Affiliation

    Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Uncharacterized protein YcnI
A, B
129Bacillus subtilisMutation(s): 0 
Gene Names: ycnIBSU03940
UniProt
Find proteins for P94431 (Bacillus subtilis (strain 168))
Explore P94431 
Go to UniProtKB:  P94431
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP94431
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.11 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.197 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.19α = 90
b = 90.19β = 90
c = 209.12γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-08-18
    Type: Initial release
  • Version 1.1: 2021-09-01
    Changes: Database references
  • Version 1.2: 2021-09-15
    Changes: Database references
  • Version 1.3: 2023-10-18
    Changes: Data collection, Refinement description