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J. Biochem, 1988, Vol. 103, No. 4 606-610
© 1988 Japanese Biochemical Society

research-article

Nucleotide Sequence of the Gene Coding for Cytochrome Oxidase Subunit I from the Thermophilic Bacterium PS31

Nobuhito Sone*, Fumiaki Yokoi*, Tao Fu*, Shigeo Ohta*, Tuula Metso**, Mirja Raitio** and Matti Saraste**

*Department of Biochemistry, Jichi Medical School Minamikawachi-machi, Tochigi 329-04
**Department of Medical Chemistry, University of Helsinki Siltavuorenpenger 10A, SF-00170 Helsinki, Finland

The gene coding for cytochrome oxidase subunit I (COI) was isolated from a genomic DNA library of the thermophilic bacterium PS3 and sequenced. The N-terminal of the COI protein was also sequenced to verify the initiation site of the reading frame. The deduced amino acid sequence of COI protein is composed of 536 amino acid residues and its molecular mass is 59,510. The protein is clearly homologous to the corresponding subunit in the mitochondrial cytochrome oxidase and similarly appears to have 12 trans-membrane segments. The proposed ligands to two hemes (cytochrome aa3) and a copper atom (CuB) in this protein (Holm et al. (1987) EMBO J. 6, 2819–2823) are conserved in the sequence.

1 This study was supported in part by a Grant-in-Aid (No. 61480468 to N.S) from the Ministry of Education, Science and Culture of Japan and by a Research Contract from the Academy of Finland (SRC).


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N. Sone, G. Sawa, T. Sone, and S. Noguchi
Thermophilic Bacilli Have Split Cytochrome b Genes for Cytochrome b[IMAGE] and Subunit IV
J. Biol. Chem., May 5, 1995; 270(18): 10612 - 10617.
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