2JI3: X-ray structure of the iron-peroxide intermediate of superoxide reductase (E114A mutant) from Desulfoarculus baarsii

Citation:
Abstract
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.
PDB ID: 2JI3Download
MMDB ID: 45500
PDB Deposition Date: 2007/2/24
Updated in MMDB: 2012/11
Experimental Method:
x-ray diffraction
Resolution: 1.95  Å
Source Organism:
Similar Structures:
Biological Unit for 2JI3: dimeric; determined by author and by software (PQS)
Molecular Components in 2JI3
Label Count Molecule
Proteins (2 molecules)
2
Desulfoferrodoxin
Molecule annotation
Chemicals (9 molecules)
1
4
2
3
3
1
4
1
* Click molecule labels to explore molecular sequence information.

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