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Conserved domains on  [gi|1234184979|gb|ASU64344|]
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cytochrome oxidase subunit 1, partial (mitochondrion) [Trematocarpus antarcticus]

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 ...
 1-210 4.77e-125

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: 361.80  E-value: 4.77e-125
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:cd01663    22 TSLSLLIRLELSQPGS--QLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPS 99

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:cd01663   100 LLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSV 179

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:cd01663   180 LITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFF 229
 
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 ...
 1-210 4.77e-125

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: 361.80  E-value: 4.77e-125
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:cd01663    22 TSLSLLIRLELSQPGS--QLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPS 99

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:cd01663   100 LLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSV 179

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:cd01663   180 LITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFF 229
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 3-210 1.61e-122

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 356.10  E-value: 1.61e-122
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00153   31 LSLLIRAELGQPGS--LIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLT 108

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00153  109 LLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVLI 188

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00153  189 TAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFF 236
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-210 1.87e-76

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 238.87  E-value: 1.87e-76
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPvMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:COG0843    34 GLLALLMRLQLAGPGLGLLSPET--YNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFG 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:COG0843   111 GLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAA 190

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:COG0843   191 LVTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHLFWFF 240
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-210 4.14e-45

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: 154.65  E-value: 4.14e-45
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLlgNHQVYNVLITAHAFLMIFFMVMPvMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:pfam00115  18 GLLGLLIRLQLAFPGLNFL--SPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLG 94

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAiveVGAGTGWTVYPPLssiqshsgGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMyRMPLFVWSI 160
Cdd:pfam00115  95 AVLLLASF---GGATTGWTEYPPL--------VGVDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAI 162

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNtsffdpAGGGDPVLYQHLFWFF 210
Cdd:pfam00115 163 LATAILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHLFWWF 206
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 1-208 9.24e-38

cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type quinone oxidase, one of several bacterial terminal oxidases. This complex couples oxidation of reduced quinones with the reduction of molecular oxygen to water and the pumping of protons to form a proton gradient utilized for ATP production. aa3-type oxidases contain two heme a cofactors as well as copper atoms in the active site. [Energy metabolism, Electron transport]


Pssm-ID: 131928  Cd Length: 643  Bit Score: 138.06  E-value: 9.24e-38
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPVMIGgFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:TIGR02882  69 GIDALLMRAQLTVPDNKFLDAQH--YNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAG 145

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:TIGR02882 146 AMLFNISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTT 225

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFW 208
Cdd:TIGR02882 226 LITTLIIIFAFPVLTVALALMTTDRIFDTAFFTVAHGGMPMLWANLFW 273
 
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 ...
 1-210 4.77e-125

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: 361.80  E-value: 4.77e-125
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:cd01663    22 TSLSLLIRLELSQPGS--QLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPS 99

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:cd01663   100 LLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSV 179

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:cd01663   180 LITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFF 229
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 3-210 1.61e-122

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 356.10  E-value: 1.61e-122
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00153   31 LSLLIRAELGQPGS--LIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLT 108

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00153  109 LLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVLI 188

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00153  189 TAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFF 236
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 3-210 7.21e-111

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 326.63  E-value: 7.21e-111
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00167   33 LSLLIRAELSQPGS--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSLL 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00167  111 LLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGITQYQTPLFVWSILV 190

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00167  191 TTILLLLSLPVLAAAITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFF 238
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 3-210 1.01e-107

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 318.46  E-value: 1.01e-107
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGnhLLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00223   30 LSLLIRAELGQPG--ALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPSLY 107

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00223  108 LLLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGMQLERLPLFVWSVKV 187

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00223  188 TAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFF 235
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 2-210 1.75e-107

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 318.19  E-value: 1.75e-107
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   2 CMSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSL 81
Cdd:MTH00116   32 ALSLLIRAELGQPGT--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  82 CLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSIL 161
Cdd:MTH00116  110 LLLLASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAMSQYQTPLFVWSVL 189

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*....
gi 1234184979 162 VTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00116  190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFF 238
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 3-210 9.65e-105

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 310.89  E-value: 9.65e-105
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00142   31 LSLLIRAELGQPGS--LLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPALL 108

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00142  109 LLLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGMKFERVPLFVWSVKI 188

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00142  189 TAILLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFF 236
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 3-210 4.49e-100

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 299.43  E-value: 4.49e-100
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00182   35 FSMLIRLELSAPGA--MLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNISFWLLPPALI 112

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00182  113 LLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGVTFNRLPLFVWSILI 192

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00182  193 TAFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILFQHLFWFF 240
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 3-210 2.19e-98

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 294.81  E-value: 2.19e-98
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00184   35 FSMLIRLELSAPGS--MLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPALT 112

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00184  113 LLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGITMDRMPLFVWSILV 192

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00184  193 TTFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHLFWFF 240
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 3-210 1.32e-96

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 290.19  E-value: 1.32e-96
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00037   33 MSVIIRTELAQPGS--LLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLIPPSFL 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00037  111 LLLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGMTFDRLPLFVWSVFI 190

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00037  191 TAFLLLLSLPVLAGAITMLLTDRNINTTFFDPAGGGDPILFQHLFWFF 238
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 3-210 5.83e-96

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 288.70  E-value: 5.83e-96
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00103   33 LSLLIRAELGQPGT--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFL 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00103  111 LLLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMSQYQTPLFVWSVLI 190

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00103  191 TAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFF 238
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 3-210 5.01e-95

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 286.07  E-value: 5.01e-95
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00077   33 LSLLIRAELSQPGT--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFL 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00077  111 LLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSMSQYQTPLFVWSVLI 190

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00077  191 TAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPVLYQHLFWFF 238
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 3-210 1.36e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 285.28  E-value: 1.36e-94
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00183   33 LSLLIRAELSQPGA--LLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFL 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00183  111 LLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVLI 190

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00183  191 TAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFF 238
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 3-210 2.00e-93

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 282.18  E-value: 2.00e-93
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00007   30 MSLLIRIELGQPGA--FLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPALI 107

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00007  108 LLVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGLRLERIPLFVWAVVI 187

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00007  188 TVVLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFF 235
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 4-210 4.20e-89

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 271.50  E-value: 4.20e-89
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   4 SMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLCL 83
Cdd:MTH00026   35 SMLIRLELSSPGS--MLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNISFWLLPPALFL 112

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  84 LLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILVT 163
Cdd:MTH00026  113 LLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGMTMSRIPLFVWSVFIT 192

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*..
gi 1234184979 164 AFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00026  193 AILLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHLFWFF 239
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 3-210 1.07e-88

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 269.63  E-value: 1.07e-88
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGnhLLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00079   34 LSLIIRLELSKPG--LLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSFWLLPTSLF 111

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVEVGAGTGWTVYPPLSSiQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILV 162
Cdd:MTH00079  112 LILDSCFVDMGPGTSWTVYPPLST-LGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSISLEHMSLFVWTVFV 190

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00079  191 TVFLLVLSLPVLAGAITMLLTDRNLNTSFFDPSTGGNPLLYQHLFWFF 238
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-210 8.08e-80

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: 245.52  E-value: 8.08e-80
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNhlLLGNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPiMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:cd00919    20 GLLALLIRLELATPGS--LFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPP-LIGARDLAFPRLNNLSFWLFPPG 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:cd00919    97 LLLLLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGMTLDKMPLFVWSV 176

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:cd00919   177 LVTAILLLLALPVLAAALVMLLLDRNFGTSFFDPAGGGDPVLYQHLFWFF 226
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-210 1.87e-76

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 238.87  E-value: 1.87e-76
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPvMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:COG0843    34 GLLALLMRLQLAGPGLGLLSPET--YNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFG 110

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:COG0843   111 GLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAA 190

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:COG0843   191 LVTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHLFWFF 240
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 1-210 4.73e-65

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: 208.59  E-value: 4.73e-65
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPVMIGgFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:cd01662    26 GVDALLMRTQLALPGNDFLSPEH--YNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFG 102

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:cd01662   103 GLLLNASLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTWTT 182

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:cd01662   183 LVTSILILFAFPVLTAALALLELDRYFGTHFFTNALGGNPMLWQHLFWIF 232
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 3-210 9.60e-61

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 197.59  E-value: 9.60e-61
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   3 MSMLIRMELAQPGNHLLlgNHQVYNVLITAHAFLMIFFMVMPVMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLC 82
Cdd:MTH00048   34 LSLLIRLNFLDPYYNVI--SLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSAWLLVPSIV 111

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  83 LLLASAIVevGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSmYRMPLFVWSILV 162
Cdd:MTH00048  112 FLLLSMCL--GAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNVF-SRTSIILWSYLF 188

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 163 TAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFWFF 210
Cdd:MTH00048  189 TSILLLLSLPVLAAAITMLLFDRNFGSAFFDPLGGGDPVLFQHMFWFF 236
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-210 4.14e-45

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: 154.65  E-value: 4.14e-45
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLlgNHQVYNVLITAHAFLMIFFMVMPvMIGGFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:pfam00115  18 GLLGLLIRLQLAFPGLNFL--SPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLG 94

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAiveVGAGTGWTVYPPLssiqshsgGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMyRMPLFVWSI 160
Cdd:pfam00115  95 AVLLLASF---GGATTGWTEYPPL--------VGVDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAI 162

                         170       180       190       200       210
                  ....*....|....*....|....*....|....*....|....*....|
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNtsffdpAGGGDPVLYQHLFWFF 210
Cdd:pfam00115 163 LATAILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHLFWWF 206
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 1-208 9.24e-38

cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type quinone oxidase, one of several bacterial terminal oxidases. This complex couples oxidation of reduced quinones with the reduction of molecular oxygen to water and the pumping of protons to form a proton gradient utilized for ATP production. aa3-type oxidases contain two heme a cofactors as well as copper atoms in the active site. [Energy metabolism, Electron transport]


Pssm-ID: 131928  Cd Length: 643  Bit Score: 138.06  E-value: 9.24e-38
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   1 GCMSMLIRMELAQPGNHLLLGNHqvYNVLITAHAFLMIFFMVMPVMIGgFGNWLVPIMIGSPDMAFPRLNNISFWLLPPS 80
Cdd:TIGR02882  69 GIDALLMRAQLTVPDNKFLDAQH--YNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAG 145

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  81 LCLLLASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSI 160
Cdd:TIGR02882 146 AMLFNISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTT 225

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 1234184979 161 LVTAFLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFW 208
Cdd:TIGR02882 226 LITTLIIIFAFPVLTVALALMTTDRIFDTAFFTVAHGGMPMLWANLFW 273
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 5-208 4.22e-37

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 136.22  E-value: 4.22e-37
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979   5 MLIRMELAQPGNHLLLGNHQvYNVLITAHAFLMIFFMVMPVMIGgFGNWLVPIMIGSPDMAFPRLNNISFWLLPPSLCLL 84
Cdd:PRK15017   79 MRSQQALASAGEAGFLPPHH-YDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILV 156

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1234184979  85 LASAIVEVGAGTGWTVYPPLSSIQSHSGGAVDLAIFSLHLSGASSILGAINFISTILNMRNPGQSMYRMPLFVWSILVTA 164
Cdd:PRK15017  157 NVSLGVGEFAQTGWLAYPPLSGIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCAN 236

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....
gi 1234184979 165 FLLLLAVPVLAGAITMLLTDRNFNTSFFDPAGGGDPVLYQHLFW 208
Cdd:PRK15017  237 VLIIASFPILTVTVALLTLDRYLGTHFFTNDMGGNMMMYINLIW 280
 
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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