Crystal structure of the C90A mutant of the Sco copper chaperone protein from Streptomyces lividans

Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.131 
  • R-Value Observed: 0.134 

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Structural and Mechanistic Insights Into an Extracytoplasmic Copper Trafficking Pathway in Streptomyces Lividans.

Blundell, K.L.I.M.Hough, M.A.Vijgenboom, E.Worrall, J.A.R.

(2014) Biochem J 459: 525

  • DOI: https://doi.org/10.1042/BJ20140017
  • Primary Citation of Related Structures:  
    3ZJA, 3ZK0, 4BPY

  • PubMed Abstract: 

    In Streptomyces lividans an extracytoplasmic copper-binding Sco protein plays a role in two unlinked processes: (i) initiating a morphological development switch and (ii) facilitating the co-factoring of the CuA domain of CcO (cytochrome c oxidase). How Sco obtains copper once secreted to the extracytoplasmic environment is unknown. In the present paper we report on a protein possessing an HX₆MX₂₁HXM motif that binds a single cuprous ion with subfemtomolar affinity. High-resolution X-ray structures of this extracytoplasmic copper chaperone-like protein (ECuC) in the apo- and Cu(I)-bound states reveal that the latter possesses a surface-accessible cuprous-ion-binding site located in a dish-shaped region of β-sheet structure. A cuprous ion is transferred under a favourable thermodynamic gradient from ECuC to Sco with no back transfer occurring. The ionization properties of the cysteine residues in the Cys⁸⁶xxxCys⁹⁰ copper-binding motif of Sco, together with their positional locations identified from an X-ray structure of Sco, suggests a role for Cys⁸⁶ in initiating an inter-complex ligand-exchange reaction with Cu(I)-ECuC. Generation of the genetic knockouts, Δsco, Δecuc and Δsco/ecuc, and subsequent in vivo assays lend support to the existence of a branched extracytoplasmic copper-trafficking pathway in S. lividans. One branch requires both Sco and to a certain extent ECuC to cofactor the CuA domain, whereas the other uses only Sco to deliver copper to a cuproenzyme to initiate morphological development.

  • Organizational Affiliation

    †Molecular Biotechnology, Institute of Biology, Sylvius Laboratory, Leiden University, PO Box 9505, 2300RA Leiden, The Netherlands.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SCO PROTEIN175Streptomyces lividansMutation(s): 1 
Find proteins for Q93J40 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Explore Q93J40 
Go to UniProtKB:  Q93J40
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ93J40
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CSD
Experimental Data & Validation

Experimental Data

  • Resolution: 1.40 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.131 
  • R-Value Observed: 0.134 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.2α = 90
b = 41.2β = 90
c = 76.631γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-05
    Type: Initial release
  • Version 1.1: 2014-04-23
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description