>cd01663 Cyt_c_Oxidase_I Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the respiratory chains of eukaryotes and most bacteria, is a multi-chain transmembrane protein located in the inner membrane of mitochondria and the cell membrane of prokaryotes. It catalyzes the reduction of O2 and simultaneously pumps protons across the membrane. The number of subunits varies from three to five in bacteria and up to 13 in mammalian mitochondria. Only subunits I and II are essential for function, but subunit III, which is also conserved, may play a role in assembly or oxygen delivery to the active site. Subunits I, II, and III of mammalian CcO are encoded within the mitochondrial genome and the remaining 10 subunits are encoded within the nuclear genome. Subunit I contains a heme-copper binuclear center (the active site where O2 is reduced to water) formed by a high-spin heme (heme a3) and a copper ion (CuB). It also contains a low-spin heme (heme a), believ

Probab=96.32  E-value=0.078  Score=30.17  Aligned_cols=42  Identities=17%  Similarity=0.397  Sum_probs=26.6

Q ss_pred             HHHHHH-HHHHHHHHHCCCCCCHHHCCHHH-HHHHHHHHHHHHHH
Q ss_conf             987556-89999997236898831331566-68999999999973
Q gi|254780473|r  211 TTLSGI-NLVVTIIKMRCPGMTMMKMPVFV-WTAFCSNIMIIAAF  253 (671)
Q Consensus       211 sll~~i-Nfi~TI~~~RapGm~l~rmPlf~-W~~l~tsil~i~a~  253 (671)
T Consensus        64 ~l~ggfgNylvPl-~iGarDmAFPRlN~lsfWl~~~g~~ll~~s~  107 (488)
T cd01663          64 ALIGGFGNWLVPL-MIGAPDMAFPRLNNLSFWLLPPSLLLLLLSA  107 (488)
T ss_pred             HHHHHHHHHHHHH-HCCCCCCHHHHHHHHHHHHHHHHHHHHHHHH
T ss_conf             9999999999999-7699620126588889999778889877555