title: Subunit IV of yeast cytochrome c oxidase: cloning and nucleotide sequencing of the gene and partial amino acid sequencing of the mature protein.
abstract: The six small subunits (IV-VII, VIIa, VIII) of yeast cytochrome c oxidase are encoded by nuclear genes and imported into the mitochondria. We have isolated the gene for subunit IV from a yeast genomic clone bank and determined its complete nucleotide sequence. We have also isolated subunit IV from purified yeast cytochrome c oxidase and determined most of its amino acid sequence which confirms the positioning of approximately 90% of the amino acid residues. The sequence comparison shows that the coding sequence of the gene lacks introns and that subunit IV is made as a precursor with an amino-terminal extension of 25 residues, five of which are basic and none of them acidic. Precursor processing involves cleavage of a Leu-Gln bond.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D003576:Electron Transport Complex IV / Q000235:genetics*; D005796:Genes; D005800:Genes, Fungal; D046911:Macromolecular Substances; D008928:Mitochondria / Q000201:enzymology; D009492:Neurospora crassa / Q000201:enzymology / Q000235:genetics; D010957:Plasmids; D012441:Saccharomyces cerevisiae / Q000201:enzymology* / Q000235:genetics; D013045:Species Specificity
chemical_list: D046911:Macromolecular Substances; D003576:Electron Transport Complex IV; D004262:DNA Restriction Enzymes