5U9M

Copper-Zinc Superoxide Dismutase is Activated through a Sulfenic Acid Intermediate at a Copper-ion Entry Site


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Copper-zinc superoxide dismutase is activated through a sulfenic acid intermediate at a copper ion entry site.

Fetherolf, M.M.Boyd, S.D.Taylor, A.B.Kim, H.J.Wohlschlegel, J.A.Blackburn, N.J.Hart, P.J.Winge, D.R.Winkler, D.D.

(2017) J Biol Chem 292: 12025-12040

  • DOI: 10.1074/jbc.M117.775981
  • Primary Citation of Related Structures:  
    5U9M

  • PubMed Abstract: 
  • Metallochaperones are a diverse family of trafficking molecules that provide metal ions to protein targets for use as cofactors. The copper chaperone for superoxide dismutase (Ccs1) activates immature copper-zinc superoxide dismutase (Sod1) by delivering copper and facilitating the oxidation of the Sod1 intramolecular disulfide bond ...

    Metallochaperones are a diverse family of trafficking molecules that provide metal ions to protein targets for use as cofactors. The copper chaperone for superoxide dismutase (Ccs1) activates immature copper-zinc superoxide dismutase (Sod1) by delivering copper and facilitating the oxidation of the Sod1 intramolecular disulfide bond. Here, we present structural, spectroscopic, and cell-based data supporting a novel copper-induced mechanism for Sod1 activation. Ccs1 binding exposes an electropositive cavity and proposed "entry site" for copper ion delivery on immature Sod1. Copper-mediated sulfenylation leads to a sulfenic acid intermediate that eventually resolves to form the Sod1 disulfide bond with concomitant release of copper into the Sod1 active site. Sod1 is the predominant disulfide bond-requiring enzyme in the cytoplasm, and this copper-induced mechanism of disulfide bond formation obviates the need for a thiol/disulfide oxidoreductase in that compartment.


    Organizational Affiliation

    Department of Biological Sciences, University of Texas at Dallas, Richardson, Texas 75080, duane.winkler@utdallas.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Superoxide dismutase [Cu-Zn]A, C153Homo sapiensMutation(s): 2 
Gene Names: SOD1
EC: 1.15.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P00441 (Homo sapiens)
Explore P00441 
Go to UniProtKB:  P00441
PHAROS:  P00441
GTEx:  ENSG00000142168 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00441
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Superoxide dismutase 1 copper chaperoneB, D248Saccharomyces cerevisiae S288CMutation(s): 3 
Gene Names: CCS1LYS7YMR038CYM9532.03C
UniProt
Find proteins for P40202 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P40202 
Go to UniProtKB:  P40202
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP40202
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates CCD File 
E [auth A],
F [auth B],
G [auth C]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.097α = 90
b = 184.353β = 90
c = 48.514γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-31
    Type: Initial release
  • Version 1.1: 2017-06-07
    Changes: Database references
  • Version 1.2: 2017-08-02
    Changes: Database references