1P1V

Crystal Structure of FALS-associated human Copper-Zinc Superoxide Dismutase (CuZnSOD) Mutant D125H to 1.4A

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.146 

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


Literature

An Alternative Mechanism of Bicarbonate-mediated Peroxidation by Copper-Zinc Superoxide Dismutase: RATES ENHANCED VIA PROPOSED ENZYME-ASSOCIATED PEROXYCARBONATE INTERMEDIATE

Elam, J.S., Malek, K., Rodriguez, J.A., Doucette, P.A., Taylor, A.B., Hayward, L.J., Cabelli, D.E., Valentine, J.S., Hart, P.J.

(2003) J Biol Chem 278: 21032-21039

  • DOI: 10.1074/jbc.M300484200
  • Primary Citation of Related Structures:  
    1P1V

  • PubMed Abstract: 

    • Hydrogen peroxide can interact with the active site of copper-zinc superoxide dismutase (SOD1) to generate a powerful oxidant. This oxidant can either damage amino acid residues at the active site, inactivating the enzyme (the self-oxidative pathway), or ...

    Hydrogen peroxide can interact with the active site of copper-zinc superoxide dismutase (SOD1) to generate a powerful oxidant. This oxidant can either damage amino acid residues at the active site, inactivating the enzyme (the self-oxidative pathway), or oxidize substrates exogenous to the active site, preventing inactivation (the external oxidative pathway). It is well established that the presence of bicarbonate anion dramatically enhances the rate of oxidation of exogenous substrates. Here, we show that bicarbonate also substantially enhances the rate of self-inactivation of human wild type SOD1. Together, these observations suggest that the strong oxidant formed by hydrogen peroxide and SOD1 in the presence of bicarbonate arises from a pathway mechanistically distinct from that producing the oxidant in its absence. Self-inactivation rates are further enhanced in a mutant SOD1 protein (L38V) linked to the fatal neurodegenerative disorder, familial amyotrophic lateral sclerosis. The 1.4 A resolution crystal structure of pathogenic SOD1 mutant D125H reveals the mode of oxyanion binding in the active site channel and implies that phosphate anion attenuates the bicarbonate effect by competing for binding to this site. The orientation of the enzyme-associated oxyanion suggests that both the self-oxidative and external oxidative pathways can proceed through an enzyme-associated peroxycarbonate intermediate.

    Organizational Affiliation: 

    Department of Biochemistry and the X-ray Crystallography Core Laboratory, University of Texas Health Science Center, San Antonio, Texas 78229-3900, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Superoxide dismutase [Cu-Zn] A, B, C153Homo sapiensMutation(s): 2 
Gene Names: SOD1
EC: 1.15.1.1
Find proteins for P00441 (Homo sapiens)
Explore P00441 
Go to UniProtKB:  P00441
NIH Common Fund Data Resources
PHAROS:  P00441
GTEx:  ENSG00000142168
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.146 
  • R-Value Observed: 0.146 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.449α = 90
b = 101.14β = 90
c = 143.08γ = 90
Software Package:
Software NamePurpose
SHELXmodel building
SHELXL-97refinement
HKL-2000data reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-08-26
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance