2ji3

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X-ray structure of the iron-peroxide intermediate of superoxide reductase (E114A mutant) from Desulfoarculus baarsii

Structural highlights

2ji3 is a 4 chain structure with sequence from Desulfarculus baarsii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.95Å
Ligands:CA, FE, NO3, PER
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

DFX_DESB2 Catalyzes the one-electron reduction of superoxide anion radical to hydrogen peroxide at a nonheme ferrous iron center. Plays a fundamental role in case of oxidative stress via its superoxide detoxification activity.[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Iron-peroxide intermediates are central in the reaction cycle of many iron-containing biomolecules. We trapped iron(III)-(hydro)peroxo species in crystals of superoxide reductase (SOR), a nonheme mononuclear iron enzyme that scavenges superoxide radicals. X-ray diffraction data at 1.95 angstrom resolution and Raman spectra recorded in crystallo revealed iron-(hydro)peroxo intermediates with the (hydro)peroxo group bound end-on. The dynamic SOR active site promotes the formation of transient hydrogen bond networks, which presumably assist the cleavage of the iron-oxygen bond in order to release the reaction product, hydrogen peroxide.

Raman-assisted crystallography reveals end-on peroxide intermediates in a nonheme iron enzyme.,Katona G, Carpentier P, Niviere V, Amara P, Adam V, Ohana J, Tsanov N, Bourgeois D Science. 2007 Apr 20;316(5823):449-53. PMID:17446401[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. ↑ Lombard M, Fontecave M, Touati D, Niviere V. Reaction of the desulfoferrodoxin from Desulfoarculus baarsii with superoxide anion. Evidence for a superoxide reductase activity. J Biol Chem. 2000 Jan 7;275(1):115-21. PMID:10617593
  2. ↑ Katona G, Carpentier P, Niviere V, Amara P, Adam V, Ohana J, Tsanov N, Bourgeois D. Raman-assisted crystallography reveals end-on peroxide intermediates in a nonheme iron enzyme. Science. 2007 Apr 20;316(5823):449-53. PMID:17446401 doi:316/5823/449

Contents


PDB ID 2ji3

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OCA

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