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Conserved domains on  [gi|1839362153|gb|QJQ82264|]
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cytochrome oxidase subunit I, partial (mitochondrion) [Porifera sp. R1995 0255]

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 ...
 1-138 1.07e-84

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 MTH00184:

Pssm-ID: 469701  Cd Length: 519  Bit Score: 256.68  E-value: 1.07e-84
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00184   37 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPALTLLLG 116

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00184  117 SAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMR 174
 
Name Accession Description Interval E-value
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-138 1.07e-84

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 256.68  E-value: 1.07e-84
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00184   37 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPALTLLLG 116

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00184  117 SAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMR 174
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-138 6.70e-81

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: 245.86  E-value: 6.70e-81
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:cd01663    26 LLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSLLLLLL 105

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:cd01663   106 SALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMR 163
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-138 2.66e-44

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 151.43  E-value: 2.66e-44
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPvMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:COG0843    38 LLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGGLLLLI 116

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:COG0843   117 SLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMR 174
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-138 1.03e-27

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: 105.73  E-value: 1.03e-27
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPvMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:pfam00115  22 LLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGAVLLLA 100

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAfveQGAGTGWTVYPPLAsiqahsggSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:pfam00115 101 SF---GGATTGWTEYPPLV--------GVDLWYIGLLLAGVSSLLGAINFIVTILKRR 147
 
Name Accession Description Interval E-value
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-138 1.07e-84

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 256.68  E-value: 1.07e-84
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00184   37 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPALTLLLG 116

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00184  117 SAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMR 174
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-138 1.65e-81

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 248.24  E-value: 1.65e-81
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00153   33 LLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLTLLLS 112

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00153  113 SSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMR 170
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-138 6.70e-81

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: 245.86  E-value: 6.70e-81
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:cd01663    26 LLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSLLLLLL 105

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:cd01663   106 SALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMR 163
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-139 2.09e-77

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 238.18  E-value: 2.09e-77
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00182   37 MLIRLELSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNISFWLLPPALILLLG 116

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMRV 139
Cdd:MTH00182  117 SAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRA 175
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-138 2.60e-74

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 229.56  E-value: 2.60e-74
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00167   35 LLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSLLLLLA 114

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00167  115 SSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMK 172
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 2-139 1.73e-73

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 227.55  E-value: 1.73e-73
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   2 LIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLGS 81
Cdd:MTH00223   33 LIRAELGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPSLYLLLSS 112

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  82 AFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMRV 139
Cdd:MTH00223  113 SAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRS 170
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-138 4.16e-72

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 223.83  E-value: 4.16e-72
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00142   33 LLIRAELGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPALLLLLS 112

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00142  113 SAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMR 170
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-138 8.50e-71

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 220.73  E-value: 8.50e-71
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00116   35 LLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLA 114

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00116  115 SSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMK 172
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-138 4.00e-67

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 211.80  E-value: 4.00e-67
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00026   36 MLIRLELSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNISFWLLPPALFLLLG 115

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00026  116 SSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMR 173
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-138 2.33e-64

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 203.96  E-value: 2.33e-64
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00103   35 LLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLA 114

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00103  115 SSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMK 172
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-138 2.57e-64

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 204.02  E-value: 2.57e-64
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00077   35 LLIRAELSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLA 114

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00077  115 SSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMK 172
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-138 4.15e-64

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 203.23  E-value: 4.15e-64
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00183   35 LLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLA 114

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00183  115 SSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMK 172
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-138 4.23e-63

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 200.51  E-value: 4.23e-63
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00007   32 LLIRIELGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPALILLVS 111

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00007  112 SAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMR 169
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 2-138 1.94e-61

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 196.59  E-value: 1.94e-61
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   2 LIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLGS 81
Cdd:MTH00037   36 IIRTELAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLIPPSFLLLLAS 115

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 1839362153  82 AFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00037  116 AGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMR 172
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-138 7.17e-55

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 179.11  E-value: 7.17e-55
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00079   36 LIIRLELSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSFWLLPTSLFLILD 115

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLaSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:MTH00079  116 SCFVDMGPGTSWTVYPPL-STLGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLR 172
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-138 7.45e-50

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: 165.01  E-value: 7.45e-50
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLyIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:cd00919    24 LLIRLELATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPPL-IGARDLAFPRLNNLSFWLFPPGLLLLLS 102

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:cd00919   103 SVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMR 160
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-138 2.66e-44

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 151.43  E-value: 2.66e-44
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPvMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:COG0843    38 LLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGGLLLLI 116

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:COG0843   117 SLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMR 174
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 1-138 6.70e-37

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: 131.16  E-value: 6.70e-37
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGgFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:cd01662    30 LLMRTQLALPGNDFLSPEHYNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFGGLLLNA 108

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAFVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:cd01662   109 SLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMR 166
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 1-135 1.50e-35

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 127.87  E-value: 1.50e-35
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPVMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:MTH00048   36 LLIRLNFLDPYYNVISLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSAWLLVPSIVFLLL 115

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 1839362153  81 SAFVeqGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIL 135
Cdd:MTH00048  116 SMCL--GAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIY 168
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-138 1.03e-27

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: 105.73  E-value: 1.03e-27
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153   1 MLIRLELSAPGSMLGDDHLYNVIVTAHAFVMVFFLVMPvMIGGFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLG 80
Cdd:pfam00115  22 LLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGAVLLLA 100

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 1839362153  81 SAfveQGAGTGWTVYPPLAsiqahsggSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:pfam00115 101 SF---GGATTGWTEYPPLV--------GVDLWYIGLLLAGVSSLLGAINFIVTILKRR 147
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 18-138 8.82e-26

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 101.17  E-value: 8.82e-26
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1839362153  18 HLYNVIVTAHAFVMVFFLVMPVMIGgFGNWLVPLYIGSPDMAFPRLNNISFWLLPPALTLLLGSAFVEQGAGTGWTVYPP 97
Cdd:PRK15017   97 HHYDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPP 175

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|.
gi 1839362153  98 LASIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTILNMR 138
Cdd:PRK15017  176 LSGIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMR 216
 
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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