Respiratory supercomplex factor 2, mitochondrial

UniProtKB accession:  P53721

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UniProtKB description:  Assembly factor that plays a role in the assembly of the respiratory chain supercomplexes (SCs) composed of ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV). May be required for late-stage assembly of the COX12 and COX13 subunits (PubMed:22310663, PubMed:22342701). Required for the generation and maintenance of a normal proton motive force (PMF) across the inner mitochondrial membrane (IMM) by preventing proton leakage through an inactive population of CIV that accumulates when RCF1 and/or RCF2 proteins are absent (PubMed:30683696, PubMed:31591265).