Component of the MITRAC (mitochondrial translation regulation assembly intermediate of cytochrome c oxidase complex) complex, that regulates cytochrome c oxidase assembly. {ECO:0000269|PubMed:24027061, ECO:0000269|PubMed:9843204, ECO:0000305|PubMed:26321642}. This is the function of Ensembl gene identifier ENSG00000148290 (SURF1, SURF1 cytochrome c oxidase assembly factor).