The rieske domain has a [2Fe-2S] centre. Two conserved cysteines coordinate one Fe ion, while the other Fe ion is coordinated by two conserved histidines. In hyperthermophilic archaea there is a SKTPCX(2-3)C motif at the C-terminus. The cysteines in this motif form a disulphide bridge, which stabilises the protein [4].

1: Structure of a water soluble fragment of the 'Rieske' iron- sulfur protein of the bovine heart mitochondrial cytochrome bc1 complex determined by MAD phasing at 1.5 A resolution. Iwata S, Saynovits M, Link TA, Michel H Structure 1996;4:567-579. PMID:8736555

2: Functional analysis in yeast of cDNA coding for the mitochondrial Rieske iron-sulfur protein of higher plants. Huang JT, Struck F, Matzinger DF, Levings CS; Proc Natl Acad Sci U S A 1991;88:10716-10720. PMID:1961737

3: The mitochondrial targeting presequence of the Rieske iron-sulfur protein is processed in a single step after insertion into the cytochrome bc1 complex in mammals and retained as a subunit in the complex. Brandt U, Yu L, Yu CA, Trumpower BL; J Biol Chem 1993;268:8387-8390. PMID:8386158

4: Role of a novel disulfide bridge within the all-beta fold of soluble Rieske proteins. Botelho HM, Leal SS, Veith A, Prosinecki V, Bauer C, Frohlich R, Kletzin A, Gomes CM; J Biol Inorg Chem. 2010;15:271-281. PMID:19862563