Its gene product is a subunit of the respiratory chain protein Ubiquinol Cytochrome c Reductase (UQCR, Complex III or Cytochrome bc1 complex), which consists of the products of one mitochondrially encoded gene, MTCYTB (mitochondrial cytochrome b) and ten nuclear genes: UQCRC1, UQCRC2, Cytochrome c1, UQCRFS1 (Rieske protein), UQCRB, UQCRQ [1]("11kDa protein"), UQCRH (cyt c1 Hinge protein), Rieske Protein presequence, UCRC("cyt. c1 associated protein"), and UQCR [2]("Rieske-associated protein").
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