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Cloning and sequencing of the cDNA for a 13th different subunit (IHQ) of beef heart cytochrome c oxidase.

The mammalian cytochrome c oxidase is a complex of 13 different subunits. We present the full amino acid sequence of the one remaining uncharacterized subunit, subunit IHQ in the nomenclature used here, VIIb in the numbering system of Kadenbach and colleagues (e.g. Kadenbach, B., and Merle, P. (1981) FEBS Lett. 135, 1-11). A partial protein sequence was obtained from the purified subunit isolated by gel filtration procedures. This information was used to synthesize an oligonucleotide probe which was then used to isolate a cDNA clone encoding the subunit. This cDNA for subunit IHQ is 480 base pairs long and encodes a polypeptide which is either 83 or 88 amino acids long, including an N-terminal leader sequence of either 27 or 32 residues. The molecular weight of the mature subunit IHQ is 6350 based on the amino acid sequence deduced from the gene. The leader sequence is typical of other mitochondrial target sequences in having several positively charged residues but no negatively charged side chains.[1]

References

  1. Cloning and sequencing of the cDNA for a 13th different subunit (IHQ) of beef heart cytochrome c oxidase. Lightowlers, R., Takamiya, S., Wessling, R., Lindorfer, M., Capaldi, R.A. J. Biol. Chem. (1989) [Pubmed]
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