| Type: | Family | Name: | Sulphur oxygenase reductase |
| Description: | The crystal structure of the sulphur oxygenase/reductase (SOR) of the thermo-acidophilic archaeon Acidianus ambivalenshas been determined to 1.7-A resolution []. Twenty-four monomers form a large hollow sphere enclosing a positively charged nanocompartment. Apolar channels provide access for linear sulphur species. A cysteine persulphide 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 sulphur oxidation and sulphur reduction.At 85 degrees C in vitro, elemental sulphur is oxidised to sulphite, thiosulphate and hydrogen sulphide with no external cofactors needed. The proposed equation is: 4S + O2+ 4 H2O --->2 HSO3- + 2 H2S + 2 H+. | Short Name: | S_Oase_red |
