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: 1.70 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.241 

wwPDB Validation   3D Report Full Report


This is version 2.0 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
  • Primary Citation of Related Structures:  
    1XZO

  • 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) center in cytochrome c oxidase and may play a role in the transfer of copper to this site ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Hypothetical protein ypmQA, B174Bacillus subtilisMutation(s): 0 
Gene Names: ypmQ
UniProt
Find proteins for P54178 (Bacillus subtilis (strain 168))
Explore P54178 
Go to UniProtKB:  P54178
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CD
Query on CD

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], E [auth A], F [auth A], O [auth B]CADMIUM ION
Cd
WLZRMCYVCSSEQC-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
G [auth A] , H [auth A] , I [auth A] , J [auth A] , K [auth A] , L [auth A] , M [auth A] , N [auth A] , 
G [auth A],  H [auth A],  I [auth A],  J [auth A],  K [auth A],  L [auth A],  M [auth A],  N [auth A],  P [auth B],  Q [auth B],  R [auth B],  S [auth B],  T [auth B],  U [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.241 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 68.033α = 90
b = 68.033β = 90
c = 191.733γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-03-01
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Data collection
  • Version 2.0: 2020-06-17
    Changes: Database references, Polymer sequence