Component of the menaquinol-cytochrome c reductase complex. The Rieske protein is a high potential 2Fe-2S protein. Binds 1 [2Fe-2S] cluster per subunit. The main subunits of the menaquinone:cytochrome c complex are: cytochrome b, the Rieske protein and a cytochrome b/c subunit. Belongs to the Rieske iron-sulfur protein family.