2V0A

Atomic resolution crystal structure of Human Superoxide Dismutase

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.15 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.155 

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This is version 1.2 of the entry. See complete history. 

Literature

Molecular Dynamics Using Atomic-Resolution Structure Reveal Structural Fluctuations that May Lead to Polymerization of Human Cu-Zn Superoxide Dismutase.

Strange, R.W., Yong, C.W., Smith, W., Hasnain, S.S.

(2007) Proc.Natl.Acad.Sci.USA 104: 10040

  • DOI: 10.1073/pnas.0703857104

  • PubMed Abstract: 

    • Mutations of the gene encoding Cu-Zn superoxide dismutase (SOD1) cause 20% of the familial cases of the progressive neurodegenerative disease ALS. A growing body of evidence suggests that in familial ALS (FALS) it is the molecular behavior of the met ...

    Mutations of the gene encoding Cu-Zn superoxide dismutase (SOD1) cause 20% of the familial cases of the progressive neurodegenerative disease ALS. A growing body of evidence suggests that in familial ALS (FALS) it is the molecular behavior of the metal-depleted SOD1 dimer that leads to a gain of toxic properties by misfolding, unfolding, and aggregation. Structural studies have so far provided static snapshots on the behavior of the wild-type enzyme and some of the FALS mutants. New approaches are required to map out the structural trajectories of the molecule. Here, using our 1.15-A resolution structure of fully metallated human SOD1 and highly parallelized molecular dynamics code on a high-performance capability computer, we have undertaken molecular dynamics calculations to 4,000 ps to reveal the first stages of misfolding caused by metal deletion. Large spatial and temporal fluctuations of the "electrostatic" and "Zn-binding" loops adjacent to the metal-binding sites are observed in the apo-enzyme relative to the fully metallated dimer. These early misfolding events expose the beta-barrels of the dimer to the external environment, allowing close interactions with adjacent molecules. Protection of the beta-edge of the protein can be partially restored by incorporating a single Zn molecule per dimer. These calculations reveal an essential step in the formation of the experimentally observed self-aggregations of metal-depleted FALS mutant SOD1. This result also has implications for the role of demetallated wild-type SOD1 in sporadic cases of ALS, for which the molecular cause still remains undiscovered.

    Organizational Affiliation: 

    Molecular Biophysics Group and Department of Computational Science and Engineering, Science and Technology Facilities Council, Daresbury Laboratory, Warrington, Cheshire WA4 4AD, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SUPEROXIDE DISMUTASE
A, F
153Homo sapiensMutation(s): 0 
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 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
A, F
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4
Download SDF File 
Download CCD File 
A, F
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
ACT
Query on ACT
Download SDF File 
Download CCD File 
F
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CU
Query on CU
Download SDF File 
Download CCD File 
A, F
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.15 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.155 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 38.545α = 90.00
b = 68.220β = 105.14
c = 50.306γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-19
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance