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Conserved domains on  [gi|1798176490|gb|QHI43088|]
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cytochrome c oxidase subunit I, partial (mitochondrion) [Pterocladiella capillacea]

Protein Classification

heme-copper oxidase family protein( domain architecture ID 14)

heme-copper oxidase family protein may catalyze the transfer of electrons from an electron donor onto molecular oxygen

Graphical summary

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List of domain hits

 Name Accession Description Interval E-value
Heme_Cu_Oxidase_I super family cl00275
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-228 5.21e-134

Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in the respiratory chains of prokaryotes and mitochondria which catalyze the reduction of O2 and simultaneously pump protons across the membrane. The superfamily is diverse in terms of electron donors, subunit composition, and heme types. The number of subunits varies from three to five in bacteria and up to 13 in mammalian mitochondria. It has been proposed that Archaea acquired heme-copper oxidases through gene transfer from Gram-positive bacteria. Membership in the superfamily is defined by subunit I, which contains a heme-copper binuclear center (the active site where O2 is reduced to water) formed by a high-spin heme and a copper ion. It also contains a low-spin heme, believed to participate in the transfer of electrons to the binuclear center. Only subunit I is common to the entire superfamily. For every reduction of an O2 molecule, eight protons are taken from the inside aqueous compartment and four electrons are taken from the electron donor on the opposite side of the membrane. The four electrons and four of the protons are used in the reduction of O2; the four remaining protons are pumped across the membrane. This charge separation of four charges contributes to the electrochemical gradient used for ATP synthesis. Two proton channels, the D-pathway and K-pathway, leading to the binuclear center have been identified in subunit I of cytochrome c oxidase (CcO) and ubiquinol oxidase. A well-defined pathway for the transfer of pumped protons beyond the binuclear center has not been identified. Electron transfer occurs in two segments: from the electron donor to the low-spin heme, and from the low-spin heme to the binuclear center. The first segment can be a multi-step process and varies among the different families, while the second segment, a direct transfer, is consistent throughout the superfamily.


The actual alignment was detected with superfamily member cd01663:

Pssm-ID: 469701  Cd Length: 488  Bit Score: 385.30  E-value: 5.21e-134
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:cd01663     5 DIGTLYLIFGLWSGLVGTSLSLLIRLELSQPGS--QLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPD 82

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:cd01663    83 MAFPRLNNLSFWLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNM 162

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:cd01663   163 RAPGMTLEKMPLFVWSVLITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFG 230
 
Name Accession Description Interval E-value
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-228 5.21e-134

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), believed to participate in the transfer of electrons to the binuclear center. For every reduction of an O2 molecule, eight protons are taken from the inside aqueous compartment and four electrons are taken from cytochrome c on the opposite side of the membrane. The four electrons and four of the protons are used in the reduction of O2; the four remaining protons are pumped across the membrane. This charge separation of four charges contributes to the electrochemical gradient used for ATP synthesis. Two proton channels, the D-pathway and K-pathway, leading to the binuclear center have been identified in subunit I. A well-defined pathway for the transfer of pumped protons beyond the binuclear center has not been identified. Electrons are transferred from cytochrome c (the electron donor) to heme a via the CuA binuclear site in subunit II, and directly from heme a to the binuclear center.


Pssm-ID: 238833  Cd Length: 488  Bit Score: 385.30  E-value: 5.21e-134
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:cd01663     5 DIGTLYLIFGLWSGLVGTSLSLLIRLELSQPGS--QLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPD 82

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:cd01663    83 MAFPRLNNLSFWLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNM 162

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:cd01663   163 RAPGMTLEKMPLFVWSVLITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFG 230
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-228 1.20e-130

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 377.67  E-value: 1.20e-130
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00153   12 DIGTLYFIFGAWSGMVGTSLSLLIRAELGQPGS--LIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPD 89

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00153   90 MAFPRMNNMSFWLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINM 169

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00153  170 RSKGMTLDRMPLFVWSVLITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFG 237
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-228 1.25e-80

Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];


Pssm-ID: 440605  Cd Length: 535  Bit Score: 250.43  E-value: 1.25e-80
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPvLIGGFGNWLVPIMIGSPD 80
Cdd:COG0843    17 RIGIMYLVTAFVFLLIGGLLALLMRLQLAGPGLGLLSPET--YNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARD 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:COG0843    94 MAFPRLNALSFWLYLFGGLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKM 173

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:COG0843   174 RAPGMTLMRMPLFTWAALVTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHLFWFFG 241
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-228 1.04e-48

Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key enzyme in aerobic metabolism. Proton pumping haem-copper oxidases represent the terminal, energy-transfer enzymes of respiratory chains in prokaryotes and eukaryotes. The CuB-haem a3 (or haem o) binuclear centre, associated with the largest subunit I of cytochrome c and ubiquinol oxidases (E.C:1.10.3.11), is directly involved in the coupling between dioxygen reduction and proton pumping. Some terminal oxidases generate a transmembrane proton gradient across the plasma membrane (prokaryotes) or the mitochondrial inner membrane (eukaryotes). The enzyme complex consists of 3-4 subunits (prokaryotes) up to 13 polypeptides (mammals) of which only the catalytic subunit (equivalent to mammalian subunit I (COXI) is found in all haem-copper respiratory oxidases. The presence of a bimetallic centre (formed by a high-spin haem and copper B) as well as a low-spin haem, both ligated to six conserved histidine residues near the outer side of four transmembrane spans within CO I is common to all family members.


Pssm-ID: 459678  Cd Length: 432  Bit Score: 165.05  E-value: 1.04e-48
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNHLLlgNHQVYNVLITAHAFLMIFFMVMPVlIGGFGNWLVPIMIGSPD 80
Cdd:pfam00115   1 RIGLLYLVTALVWFLVGGLLGLLIRLQLAFPGLNFL--SPLTYNQLRTLHGNLMIFWFATPF-LFGFGNYLVPLMIGARD 77

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALvevGVGTGWTVYPPLssiqshsgGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:pfam00115  78 MAFPRLNALSFWLVVLGAVLLLASFG---GATTGWTEYPPL--------VGVDLWYIGLLLAGVSSLLGAINFIVTILKR 146

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMyRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNtsffdpAGGGDPVLYQHLFWFFG 228
Cdd:pfam00115 147 RAPGMTL-RMPLFVWAILATAILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHLFWWFG 207
 
Name Accession Description Interval E-value
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-228 5.21e-134

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), believed to participate in the transfer of electrons to the binuclear center. For every reduction of an O2 molecule, eight protons are taken from the inside aqueous compartment and four electrons are taken from cytochrome c on the opposite side of the membrane. The four electrons and four of the protons are used in the reduction of O2; the four remaining protons are pumped across the membrane. This charge separation of four charges contributes to the electrochemical gradient used for ATP synthesis. Two proton channels, the D-pathway and K-pathway, leading to the binuclear center have been identified in subunit I. A well-defined pathway for the transfer of pumped protons beyond the binuclear center has not been identified. Electrons are transferred from cytochrome c (the electron donor) to heme a via the CuA binuclear site in subunit II, and directly from heme a to the binuclear center.


Pssm-ID: 238833  Cd Length: 488  Bit Score: 385.30  E-value: 5.21e-134
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:cd01663     5 DIGTLYLIFGLWSGLVGTSLSLLIRLELSQPGS--QLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPD 82

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:cd01663    83 MAFPRLNNLSFWLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNM 162

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:cd01663   163 RAPGMTLEKMPLFVWSVLITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFG 230
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-228 1.20e-130

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 377.67  E-value: 1.20e-130
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00153   12 DIGTLYFIFGAWSGMVGTSLSLLIRAELGQPGS--LIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPD 89

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00153   90 MAFPRMNNMSFWLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINM 169

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00153  170 RSKGMTLDRMPLFVWSVLITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFG 237
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-228 4.07e-118

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 345.89  E-value: 4.07e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00167   14 DIGTLYFIFGAWAGMVGTALSLLIRAELSQPGS--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPD 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00167   92 MAFPRMNNMSFWLLPPSLLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINM 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00167  172 KPPGITQYQTPLFVWSILVTTILLLLSLPVLAAAITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFG 239
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-228 1.32e-115

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 339.76  E-value: 1.32e-115
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00116   14 DIGTLYLIFGAWAGMVGTALSLLIRAELGQPGT--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPD 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00116   92 MAFPRMNNMSFWLLPPSFLLLLASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINM 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00116  172 KPPAMSQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFG 239
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-228 3.19e-114

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 335.79  E-value: 3.19e-114
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGnhLLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00223   11 DIGTLYLIFGMWSGLVGTSLSLLIRAELGQPG--ALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPD 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00223   89 MAFPRLNNMSFWLLPPSLYLLLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINM 168

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00223  169 RSPGMQLERLPLFVWSVKVTAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFG 236
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-228 3.01e-111

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 328.22  E-value: 3.01e-111
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00142   12 DIGTLYFLFGAWAGMVGTGLSLLIRAELGQPGS--LLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPD 89

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00142   90 MAFPRMNNMSFWLLPPALLLLLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINM 169

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00142  170 RAGGMKFERVPLFVWSVKITAILLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFG 237
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-228 1.21e-105

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 314.45  E-value: 1.21e-105
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00182   16 DIGTLYLVFGAGAGMIGTAFSMLIRLELSAPGA--MLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPD 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00182   94 MAFPRLNNISFWLLPPALILLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNM 173

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00182  174 RAPGVTFNRLPLFVWSILITAFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILFQHLFWFFG 241
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-228 4.26e-104

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 310.22  E-value: 4.26e-104
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00037   14 DIGTLYLIFGAWAGMVGTAMSVIIRTELAQPGS--LLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPD 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00037   92 MAFPRMNNMSFWLIPPSFLLLLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINM 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00037  172 RTPGMTFDRLPLFVWSVFITAFLLLLSLPVLAGAITMLLTDRNINTTFFDPAGGGDPILFQHLFWFFG 239
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-228 6.19e-104

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 309.83  E-value: 6.19e-104
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00184   16 DIGTLYLLFGAFAGMIGTAFSMLIRLELSAPGS--MLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPD 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00184   94 MAFPRLNNISFWLLPPALTLLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNM 173

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00184  174 RAPGITMDRMPLFVWSILVTTFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHLFWFFG 241
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-228 7.74e-102

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 304.50  E-value: 7.74e-102
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00103   14 DIGTLYLLFGAWAGMVGTALSLLIRAELGQPGT--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPD 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00103   92 MAFPRMNNMSFWLLPPSFLLLLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINM 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00103  172 KPPAMSQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFG 239
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-228 1.20e-101

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 303.79  E-value: 1.20e-101
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00077   14 DIGTLYLVFGAWAGMVGTALSLLIRAELSQPGT--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPD 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00077   92 MAFPRMNNMSFWLLPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINM 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00077  172 KPPSMSQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPVLYQHLFWFFG 239
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-228 3.14e-100

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 300.30  E-value: 3.14e-100
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00183   14 DIGTLYLVFGAWAGMVGTALSLLIRAELSQPGA--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPD 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00183   92 MAFPRMNNMSFWLLPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINM 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00183  172 KPPAISQYQTPLFVWAVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFG 239
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-228 5.79e-100

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 299.51  E-value: 5.79e-100
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00007   11 DIGTLYFILGVWGGLLGTSMSLLIRIELGQPGA--FLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPD 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00007   89 MAFPRLNNMSFWLLPPALILLVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINM 168

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00007  169 RWKGLRLERIPLFVWAVVITVVLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFG 236
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-228 1.17e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 285.81  E-value: 1.17e-94
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGnhLLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00079   15 DIGTLYFLFGLWSGMVGTSLSLIIRLELSKPG--LLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPD 92

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSiQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00079   93 MSFPRLNNLSFWLLPTSLFLILDSCFVDMGPGTSWTVYPPLST-LGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNL 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00079  172 RSSSISLEHMSLFVWTVFVTVFLLVLSLPVLAGAITMLLTDRNLNTSFFDPSTGGNPLLYQHLFWFFG 239
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-228 5.98e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 284.98  E-value: 5.98e-94
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPD 80
Cdd:MTH00026   15 DIGSLYLVFGALSGAIGTAFSMLIRLELSSPGS--MLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPD 92

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:MTH00026   93 MAFPRLNNISFWLLPPALFLLLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNM 172

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00026  173 RTPGMTMSRIPLFVWSVFITAILLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHLFWFFG 240
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-228 8.37e-85

Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in the respiratory chains of prokaryotes and mitochondria which catalyze the reduction of O2 and simultaneously pump protons across the membrane. The superfamily is diverse in terms of electron donors, subunit composition, and heme types. The number of subunits varies from three to five in bacteria and up to 13 in mammalian mitochondria. It has been proposed that Archaea acquired heme-copper oxidases through gene transfer from Gram-positive bacteria. Membership in the superfamily is defined by subunit I, which contains a heme-copper binuclear center (the active site where O2 is reduced to water) formed by a high-spin heme and a copper ion. It also contains a low-spin heme, believed to participate in the transfer of electrons to the binuclear center. Only subunit I is common to the entire superfamily. For every reduction of an O2 molecule, eight protons are taken from the inside aqueous compartment and four electrons are taken from the electron donor on the opposite side of the membrane. The four electrons and four of the protons are used in the reduction of O2; the four remaining protons are pumped across the membrane. This charge separation of four charges contributes to the electrochemical gradient used for ATP synthesis. Two proton channels, the D-pathway and K-pathway, leading to the binuclear center have been identified in subunit I of cytochrome c oxidase (CcO) and ubiquinol oxidase. A well-defined pathway for the transfer of pumped protons beyond the binuclear center has not been identified. Electron transfer occurs in two segments: from the electron donor to the low-spin heme, and from the low-spin heme to the binuclear center. The first segment can be a multi-step process and varies among the different families, while the second segment, a direct transfer, is consistent throughout the superfamily.


Pssm-ID: 238461  Cd Length: 463  Bit Score: 259.00  E-value: 8.37e-85
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPiMIGSPD 80
Cdd:cd00919     3 DIGLLYLIFAFVALLLGGLLALLIRLELATPGS--LFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPP-LIGARD 79

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:cd00919    80 LAFPRLNNLSFWLFPPGLLLLLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNM 159

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:cd00919   160 RAPGMTLDKMPLFVWSVLVTAILLLLALPVLAAALVMLLLDRNFGTSFFDPAGGGDPVLYQHLFWFFG 227
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-228 1.25e-80

Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];


Pssm-ID: 440605  Cd Length: 535  Bit Score: 250.43  E-value: 1.25e-80
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPvLIGGFGNWLVPIMIGSPD 80
Cdd:COG0843    17 RIGIMYLVTAFVFLLIGGLLALLMRLQLAGPGLGLLSPET--YNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARD 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:COG0843    94 MAFPRLNALSFWLYLFGGLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKM 173

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:COG0843   174 RAPGMTLMRMPLFTWAALVTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHLFWFFG 241
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 2-228 3.36e-67

Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory chains of aerobic bacteria, is a multi-chain transmembrane protein located in the cell membrane. It catalyzes the reduction of O2 and simultaneously pumps protons across the membrane. The number of subunits in ubiquinol oxidase varies from two to five. Subunit I contains a heme-copper binuclear center (the active site where O2 is reduced to water) formed by a high-spin heme and a copper ion. It also contains a low-spin heme, believed to participate in the transfer of electrons from ubiquinol to the binuclear center. For every reduction of an O2 molecule, eight protons are taken from the inside aqueous compartment and four electrons are taken from ubiquinol on the opposite side of the membrane. The four electrons and four of the protons are used in the reduction of O2; the four remaining protons are pumped across the membrane. This charge separation of four charges contributes to the electrochemical gradient used for ATP synthesis. Two proton channels, the D-pathway and K-pathway, leading to the binuclear center have been identified in subunit I. It is generally believed that the channels contain water molecules that act as 'proton wires' to transfer the protons. A well-defined pathway for the transfer of pumped protons beyond the binuclear center has not been identified. Electrons are believed to be transferred directly from ubiquinol (the electron donor) to the low-spin heme, and directly from the low-spin heme to the binuclear center.


Pssm-ID: 238832  Cd Length: 501  Bit Score: 214.75  E-value: 3.36e-67
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   2 IGTLYLIFGAFSGILGGCMSILIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPVLIGgFGNWLVPIMIGSPDM 81
Cdd:cd01662    10 IGIMYIITAFVFFLRGGVDALLMRTQLALPGNDFLSPEH--YNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDV 86

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  82 AFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSMR 161
Cdd:cd01662    87 AFPRLNALSFWLFLFGGLLLNASLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMR 166

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 1798176490 162 NPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:cd01662   167 APGMTLMRMPIFTWTTLVTSILILFAFPVLTAALALLELDRYFGTHFFTNALGGNPMLWQHLFWIFG 233
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 2-228 4.32e-64

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 206.84  E-value: 4.32e-64
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   2 IGTLYLIFGAFSGILGGCMSILIRMELAQPGNHLLlgNHQVYNVLITAHAFLMIFFMVMPVLIGGFGNWLVPIMIGSPDM 81
Cdd:MTH00048   16 IGVIYTLLGVWSGFVGLSLSLLIRLNFLDPYYNVI--SLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDL 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  82 AFPRLNNISFWLLPPSLCLLLTSALVevGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILSMR 161
Cdd:MTH00048   94 NLPRLNALSAWLLVPSIVFLLLSMCL--GAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAF 171

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 1798176490 162 NPgQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:MTH00048  172 MT-NVFSRTSIILWSYLFTSILLLLSLPVLAAAITMLLFDRNFGSAFFDPLGGGDPVLFQHMFWFFG 237
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-228 1.04e-48

Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key enzyme in aerobic metabolism. Proton pumping haem-copper oxidases represent the terminal, energy-transfer enzymes of respiratory chains in prokaryotes and eukaryotes. The CuB-haem a3 (or haem o) binuclear centre, associated with the largest subunit I of cytochrome c and ubiquinol oxidases (E.C:1.10.3.11), is directly involved in the coupling between dioxygen reduction and proton pumping. Some terminal oxidases generate a transmembrane proton gradient across the plasma membrane (prokaryotes) or the mitochondrial inner membrane (eukaryotes). The enzyme complex consists of 3-4 subunits (prokaryotes) up to 13 polypeptides (mammals) of which only the catalytic subunit (equivalent to mammalian subunit I (COXI) is found in all haem-copper respiratory oxidases. The presence of a bimetallic centre (formed by a high-spin haem and copper B) as well as a low-spin haem, both ligated to six conserved histidine residues near the outer side of four transmembrane spans within CO I is common to all family members.


Pssm-ID: 459678  Cd Length: 432  Bit Score: 165.05  E-value: 1.04e-48
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   1 DIGTLYLIFGAFSGILGGCMSILIRMELAQPGNHLLlgNHQVYNVLITAHAFLMIFFMVMPVlIGGFGNWLVPIMIGSPD 80
Cdd:pfam00115   1 RIGLLYLVTALVWFLVGGLLGLLIRLQLAFPGLNFL--SPLTYNQLRTLHGNLMIFWFATPF-LFGFGNYLVPLMIGARD 77

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  81 MAFPRLNNISFWLLPPSLCLLLTSALvevGVGTGWTVYPPLssiqshsgGAVDLAIFSLHISGASSILGAVNFISTILSM 160
Cdd:pfam00115  78 MAFPRLNALSFWLVVLGAVLLLASFG---GATTGWTEYPPL--------VGVDLWYIGLLLAGVSSLLGAINFIVTILKR 146

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 1798176490 161 RNPGQTMyRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNtsffdpAGGGDPVLYQHLFWFFG 228
Cdd:pfam00115 147 RAPGMTL-RMPLFVWAILATAILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHLFWWFG 207
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 2-228 3.45e-37

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 137.37  E-value: 3.45e-37
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490   2 IGTLYLIFGAFSGILGGCMSILIRME--LAQPGNHLLLGNHQvYNVLITAHAFLMIFFMVMPVLIGgFGNWLVPIMIGSP 79
Cdd:PRK15017   57 LGIMYIIVAIVMLLRGFADAIMMRSQqaLASAGEAGFLPPHH-YDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGAR 134

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1798176490  80 DMAFPRLNNISFWLLPPSLCLLLTSALVEVGVGTGWTVYPPLSSIQSHSGGAVDLAIFSLHISGASSILGAVNFISTILS 159
Cdd:PRK15017  135 DVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPPLSGIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILK 214

                         170       180       190       200       210       220
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 1798176490 160 MRNPGQTMYRMPLFVWSIFVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFFG 228
Cdd:PRK15017  215 MRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTLDRYLGTHFFTNDMGGNMMMYINLIWAWG 283
 
Blast search parameters
Data Source: Precalculated data, version = cdd.v.3.21
Preset Options:Database: CDSEARCH/cdd   Low complexity filter: no  Composition Based Adjustment: yes   E-value threshold: 0.01

References:

  • Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
  • Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
  • Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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