Its gene product is a subunit of the respiratory chain protein Ubiquinol Cytochrome c Reductase (UQCR, Complex III or Cytochrome bc1 complex; E.C. 1.10.2.2), 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, "11kDa protein", UQCRH (cyt c1 Hinge protein), Rieske Protein presequence, "cyt. c1 associated protein", and "Rieske-associated protein".
Wen JJ, Garg N (2005). "Oxidative modification of mitochondrial respiratory complexes in response to the stress of Trypanosoma cruzi infection". Free Radic. Biol. Med. 37 (12): 2072–81. doi:10.1016/j.freeradbiomed.2004.09.011. PMID15544925.