A protein complex composed of enzymes and accessory factors of the ubiquinone (CoQ) biosynthesis pathway. In E. coli, the complex is composed of seven proteins: UbiE, F, G, H, I, J and K. In eukaryotes, the complex is located on the matrix face of the inner mitochondrial membrane and includes COQ3, COQ4, COQ5, COQ6, COQ7, COQ9. [GOC:imk, PMID:27060254, PMID:28927698, PMID:30686758]
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C5: Ontology GO: Gene Ontology GO:CC: GO Cellular Component