1XZO

Identification of a disulfide switch in BsSco, a member of the Sco family of cytochrome c oxidase assembly proteins


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.702 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Identification of a Disulfide Switch in BsSco, a Member of the Sco Family of Cytochrome c Oxidase Assembly Proteins

Ye, Q.Imriskova-Sosova, I.Hill, B.C.Jia, Z.

(2005) Biochemistry 44: 2934-2942

  • DOI: 10.1021/bi0480537

  • PubMed Abstract: 
  • BsSco is a membrane-associated protein from Bacillus subtilis characterized by the sequence CXXXCP, which is conserved in yeast and human mitochondrial Sco proteins, and their bacterial homologues. BsSco is involved in the assembly of the Cu(A) cente ...

    BsSco is a membrane-associated protein from Bacillus subtilis characterized by the sequence CXXXCP, which is conserved in yeast and human mitochondrial Sco proteins, and their bacterial homologues. BsSco is involved in the assembly of the Cu(A) center in cytochrome c oxidase and may play a role in the transfer of copper to this site. We have characterized the soluble domain of BsSco by biochemical, spectroscopic, and structural approaches. Soluble BsSco is monomeric in solution, and the two conserved cysteines are involved in an intramolecular cystine bridge. The cystine bridge is easily reduced, and circular dichroism spectroscopy shows no large-scale changes in BsSco's secondary structure upon reduction. The crystal structure of soluble BsSco, determined at 1.7 A resolution, reveals typical elements of a thioredoxin fold. The CXXXCP motif, in which Cys45 and Cys49 are conserved, is located in a turn structure on the surface of the protein. In various native and His135Ala mutant structures, both disulfide-bonded and non-disulfide-bonded forms of CXXXCP are observed. However, despite extensive attempts, copper has not been found near or beyond the CXXXCP motif, a presumptive copper-binding site. Another potential copper binding residue, His135, is located in a highly flexible loop parallel to the CXXXCP loop but is more than 10 A from Cys45 and Cys49. If these three residues are to coordinate copper, a conformational change is necessary. The structural identification of a disulfide switch demonstrates that BsSco has the capability to fill a redox role in Cu(A) assembly.


    Organizational Affiliation

    Department of Biochemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hypothetical protein ypmQ
A, B
174Bacillus subtilis (strain 168)Mutation(s): 0 
Gene Names: ypmQ
Find proteins for P54178 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P54178
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
CD
Query on CD

Download SDF File 
Download CCD File 
A, B
CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.702 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.238 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 68.033α = 90.00
b = 68.033β = 90.00
c = 191.733γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SOLVEphasing
DENZOdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-03-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-11
    Type: Data collection