Crystal structure of Arabidopsis thaliana ScoI with copper bound

Experimental Data Snapshot

  • Resolution: 2.66 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

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Arabidopsis thaliana Hcc1 is a Sco-like metallochaperone for CuAassembly in Cytochrome c Oxidase.

Llases, M.E.Lisa, M.N.Morgada, M.N.Giannini, E.Alzari, P.M.Vila, A.J.

(2020) FEBS J 287: 749-762

  • DOI: https://doi.org/10.1111/febs.15016
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The assembly of the Cu A site in Cytochrome c Oxidase (COX) is a critical step for aerobic respiration in COX-dependent organisms. Several gene products have been associated with the assembly of this copper site, the most conserved of them belonging to the Sco family of proteins, which have been shown to perform different roles in different organisms. Plants express two orthologs of Sco proteins: Hcc1 and Hcc2. Hcc1 is known to be essential for plant development and for COX maturation, but its precise function has not been addressed until now. Here, we report the biochemical, structural and functional characterization of Arabidopsis thaliana Hcc1 protein (here renamed Sco1). We solved the crystal structure of the Cu +1 -bound soluble domain of this protein, revealing a tri coordinated environment involving a CxxxCx n H motif. We show that AtSco1 is able to work as a copper metallochaperone, inserting two Cu +1 ions into the Cu A site in a model of CoxII. We also show that AtSco1 does not act as a thiol-disulfide oxido-reductase. Overall, this information sheds new light on the biochemistry of Sco proteins, highlighting the diversity of functions among them despite their high structural similarities. DATABASE: PDB entry 6N5U (Crystal structure of Arabidopsis thaliana ScoI with copper bound).

  • Organizational Affiliation

    Instituto de Biología Molecular y Celular de Rosario (IBR CONICET-UNR), Rosario, Argentina.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein SCO1 homolog 1, mitochondrial
A, B, C
170Arabidopsis thalianaMutation(s): 0 
Gene Names: HCC1SCO1-1At3g08950T16O11.9
Find proteins for Q8VYP0 (Arabidopsis thaliana)
Explore Q8VYP0 
Go to UniProtKB:  Q8VYP0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8VYP0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.66 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.65α = 90
b = 80.44β = 94.75
c = 72.31γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Council (NRC, Argentina)ArgentinaPICT-2012-1285

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-24
    Type: Initial release
  • Version 1.1: 2019-08-28
    Changes: Data collection, Database references
  • Version 1.2: 2020-01-08
    Changes: Author supporting evidence
  • Version 1.3: 2020-03-04
    Changes: Database references
  • Version 1.4: 2023-10-11
    Changes: Data collection, Database references, Refinement description