Numerous microorganisms oxidize sulfur for energy conservation and contribute to the global biogeochemical sulfur cycle. We have determined the 1.7 angstrom-resolution structure of the sulfur oxygenase reductase from the thermoacidophilic archaeon Acidianus ambivalens, which catalyzes an oxygen-dependent disproportionation of elemental sulfur ...
Numerous microorganisms oxidize sulfur for energy conservation and contribute to the global biogeochemical sulfur cycle. We have determined the 1.7 angstrom-resolution structure of the sulfur oxygenase reductase from the thermoacidophilic archaeon Acidianus ambivalens, which catalyzes an oxygen-dependent disproportionation of elemental sulfur. Twenty-four monomers form a large hollow sphere enclosing a positively charged nanocompartment. Apolar channels provide access for linear sulfur species. A cysteine persulfide and a low-potential mononuclear non-heme iron site ligated by a 2-His-1-carboxylate facial triad in a pocket of each subunit constitute the active sites, accessible from the inside of the sphere. The iron is likely the site of both sulfur oxidation and sulfur reduction.
Related Citations:
The Sulfur Oxygenase Reductase from Acidianus Ambivalens is an Icosatetramer as Shown by Crystallization and Patterson Analysis Urich, T., Coelho, R., Kletzin, A., Frazao, C. (2005) Biochim Biophys Acta 1747: 267
Molecular Characterization of the Sor Gene, which Encodes the Sulfur Oxygenase-Reductase of the Thermoacidophilic Archaeum Desulfurolobus Ambivalens Kletzin, A. (1992) J Bacteriol 174: 5854
Coupled Enzymatic Production of Sulfite, Thiosulfate, and Hydrogen Sulfide from Sulfur: Purification and Properties of a Sulfur Oxygenase Reductase from the Facultatively Anaerobic Archaebacterium Desulfurolobus Ambivalens Kletzin, A. (1989) J Bacteriol 171: 1638
Organizational Affiliation:
Darmstadt University of Technology, Institute of Microbiology and Genetics, Schnittspahnstrasse 10, 64287 Darmstadt, Germany.
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