3K91

Polysulfane Bridge in Cu-Zn Superoxide Dismutase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Characterization of a covalent polysulfane bridge in copper-zinc superoxide dismutase .

You, Z.Cao, X.Taylor, A.B.Hart, P.J.Levine, R.L.

(2010) Biochemistry 49: 1191-1198

  • DOI: 10.1021/bi901844d

  • PubMed Abstract: 
  • In the course of studies on human copper-zinc superoxide dismutase (SOD1), we observed a modified form of the protein whose mass was increased by 158 mass units. The covalent modification was characterized, and we established that it is a novel hepta ...

    In the course of studies on human copper-zinc superoxide dismutase (SOD1), we observed a modified form of the protein whose mass was increased by 158 mass units. The covalent modification was characterized, and we established that it is a novel heptasulfane bridge connecting the two Cys111 residues in the SOD1 homodimer. The heptasulfane bridge was visualized directly in the crystal structure of a recombinant human mutant SOD1, H46R/H48Q, produced in yeast. The modification is reversible, with the bridge being cleaved by thiols, by cyanide, and by unfolding of the protein to expose the polysulfane. The polysulfane bridge can be introduced in vitro by incubation of purified SOD1 with elemental sulfur, even under anaerobic conditions and in the presence of a metal chelator. Because polysulfanes and polysulfides can catalyze the generation of reactive oxygen and sulfur species, the modification may endow SOD1 with a toxic gain of function.


    Organizational Affiliation

    Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, Bethesda, Maryland 20892, USA.




Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Superoxide dismutase [Cu-Zn]
A, B
153Homo sapiensMutations: R46H, Q48H
Gene Names: SOD1
EC: 1.15.1.1
Find proteins for P00441 (Homo sapiens)
Go to Gene View: SOD1
Go to UniProtKB:  P00441
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PS5
Query on PS5

Download SDF File 
Download CCD File 
A
PENTASULFIDE-SULFUR
S5
FBNHIFPJXGPDIP-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 40.049α = 90.00
b = 57.925β = 90.00
c = 104.988γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
PHENIXrefinement
CrystalCleardata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance