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Conserved domains on  [gi|1404740614|gb|AWV55725|]
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cytochrome oxidase subunit I, partial (mitochondrion) [Atractomorpha burri]

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 ...
 1-202 3.59e-132

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 MTH00153:

Pssm-ID: 469701  Cd Length: 511  Bit Score: 380.37  E-value: 3.59e-132
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00153   23 WSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWL 102

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00153  103 LPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLF 182

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00153  183 VWSVLITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 224
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-202 3.59e-132

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 380.37  E-value: 3.59e-132
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00153   23 WSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWL 102

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00153  103 LPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLF 182

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00153  183 VWSVLITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 224
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-202 4.18e-118

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: 343.70  E-value: 4.18e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:cd01663    16 WSGLVGTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWL 95

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:cd01663    96 LPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLF 175

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:cd01663   176 VWSVLITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGG 217
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
6-202 1.01e-61

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 200.35  E-value: 1.01e-61
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   6 GTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPiMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSL 85
Cdd:COG0843    33 GGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGG 111

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  86 TLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFVWSVA 165
Cdd:COG0843   112 LLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAAL 191

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1404740614 166 ITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:COG0843   192 VTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGG 228
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 3-199 4.14e-38

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: 136.16  E-value: 4.14e-38
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   3 GMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPiMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLP 82
Cdd:pfam00115  14 FLVGGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVV 92

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  83 PSLTLLISSSLvntGVGTGWTIYPPLasaiahsgTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLdQTPLFVW 162
Cdd:pfam00115  93 LGAVLLLASFG---GATTGWTEYPPL--------VGVDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVW 160

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1404740614 163 SVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPA 199
Cdd:pfam00115 161 AILATAILILLAFPVLAAALLLLLLDRSLGAGGGDPL 197
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 10-202 3.38e-31

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: 119.19  E-value: 3.38e-31
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  10 SMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGgFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSLTLLI 89
Cdd:TIGR02882  72 ALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGAMLFN 150

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  90 SSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFVWSVAITAL 169
Cdd:TIGR02882 151 ISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTLITTL 230

                         170       180       190
                  ....*....|....*....|....*....|...
gi 1404740614 170 LLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:TIGR02882 231 IIIFAFPVLTVALALMTTDRIFDTAFFTVAHGG 263
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-202 3.59e-132

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 380.37  E-value: 3.59e-132
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00153   23 WSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWL 102

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00153  103 LPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLF 182

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00153  183 VWSVLITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 224
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-202 4.18e-118

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: 343.70  E-value: 4.18e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:cd01663    16 WSGLVGTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWL 95

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:cd01663    96 LPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLF 175

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:cd01663   176 VWSVLITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGG 217
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-202 4.96e-115

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 337.03  E-value: 4.96e-115
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00167   25 WAGMVGTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 104

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00167  105 LPPSLLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGITQYQTPLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00167  185 VWSILVTTILLLLSLPVLAAAITMLLTDRNLNTTFFDPAGGG 226
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-202 3.37e-114

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 334.75  E-value: 3.37e-114
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00116   25 WAGMVGTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 104

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00116  105 LPPSFLLLLASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAMSQYQTPLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00116  185 VWSVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGG 226
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-202 4.26e-108

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 318.98  E-value: 4.26e-108
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00142   23 WAGMVGTGLSLLIRAELGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWL 102

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00142  103 LPPALLLLLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGMKFERVPLF 182

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00142  183 VWSVKITAILLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGG 224
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-202 8.26e-108

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 318.46  E-value: 8.26e-108
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00223   22 WSGLVGTSLSLLIRAELGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSFWL 101

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00223  102 LPPSLYLLLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGMQLERLPLF 181

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00223  182 VWSVKVTAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGG 223
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-202 4.10e-101

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 301.47  E-value: 4.10e-101
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00077   25 WAGMVGTALSLLIRAELSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 104

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00077  105 LPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSMSQYQTPLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00077  185 VWSVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGG 226
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-202 5.68e-101

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 301.03  E-value: 5.68e-101
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00103   25 WAGMVGTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 104

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00103  105 LPPSFLLLLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMSQYQTPLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00103  185 VWSVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGG 226
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-202 5.30e-100

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 298.76  E-value: 5.30e-100
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00183   25 WAGMVGTALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWL 104

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00183  105 LPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00183  185 VWAVLITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGG 226
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-202 1.38e-99

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 297.51  E-value: 1.38e-99
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00037   25 WAGMVGTAMSVIIRTELAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWL 104

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00037  105 IPPSFLLLLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGMTFDRLPLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00037  185 VWSVFITAFLLLLSLPVLAGAITMLLTDRNINTTFFDPAGGG 226
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-202 8.07e-99

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 295.66  E-value: 8.07e-99
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00007   22 WGGLLGTSMSLLIRIELGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSFWL 101

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00007  102 LPPALILLVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGLRLERIPLF 181

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00007  182 VWAVVITVVLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 223
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 2-202 6.47e-92

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 278.24  E-value: 6.47e-92
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   2 SGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLL 81
Cdd:MTH00182   28 AGMIGTAFSMLIRLELSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNISFWLL 107

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  82 PPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFV 161
Cdd:MTH00182  108 PPALILLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGVTFNRLPLFV 187

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|.
gi 1404740614 162 WSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00182  188 WSILITAFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGG 228
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-202 3.63e-90

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 273.63  E-value: 3.63e-90
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00184   27 FAGMIGTAFSMLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWL 106

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00184  107 LPPALTLLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGITMDRMPLF 186

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00184  187 VWSILVTTFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGG 228
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-202 2.04e-88

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 268.86  E-value: 2.04e-88
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00079   26 WSGMVGTSLSLIIRLELSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSFWL 105

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLaSAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:MTH00079  106 LPTSLFLILDSCFVDMGPGTSWTVYPPL-STLGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSISLEHMSLF 184

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00079  185 VWTVFVTVFLLVLSLPVLAGAITMLLTDRNLNTSFFDPSTGG 226
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 2-202 1.67e-82

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 254.17  E-value: 1.67e-82
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   2 SGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLL 81
Cdd:MTH00026   27 SGAIGTAFSMLIRLELSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNISFWLL 106

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  82 PPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFV 161
Cdd:MTH00026  107 PPALFLLLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGMTMSRIPLFV 186

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|.
gi 1404740614 162 WSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00026  187 WSVFITAILLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGG 227
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-202 1.74e-73

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: 228.95  E-value: 1.74e-73
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPlMIGAPDMAFPRMNNMSFWL 80
Cdd:cd00919    14 VALLLGGLLALLIRLELATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPP-LIGARDLAFPRLNNLSFWL 92

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLF 160
Cdd:cd00919    93 FPPGLLLLLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGMTLDKMPLF 172

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:cd00919   173 VWSVLVTAILLLLALPVLAAALVMLLLDRNFGTSFFDPAGGG 214
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
6-202 1.01e-61

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 200.35  E-value: 1.01e-61
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   6 GTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPiMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSL 85
Cdd:COG0843    33 GGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGG 111

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  86 TLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFVWSVA 165
Cdd:COG0843   112 LLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAAL 191

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1404740614 166 ITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:COG0843   192 VTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGG 228
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 1-202 7.12e-57

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 187.19  E-value: 7.12e-57
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   1 WSGMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 80
Cdd:MTH00048   26 WSGFVGLSLSLLIRLNFLDPYYNVISLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSAWL 105

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  81 LPPSLTLLISSSLVntGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLdQTPLF 160
Cdd:MTH00048  106 LVPSIVFLLLSMCL--GAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNVFS-RTSII 182

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|..
gi 1404740614 161 VWSVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:MTH00048  183 LWSYLFTSILLLLSLPVLAAAITMLLFDRNFGSAFFDPLGGG 224
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 5-202 3.96e-48

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: 163.91  E-value: 3.96e-48
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   5 MGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGgFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPS 84
Cdd:cd01662    24 RGGVDALLMRTQLALPGNDFLSPEHYNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFG 102

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  85 LTLLISSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFVWSV 164
Cdd:cd01662   103 GLLLNASLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTWTT 182

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1404740614 165 AITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:cd01662   183 LVTSILILFAFPVLTAALALLELDRYFGTHFFTNALGG 220
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 3-199 4.14e-38

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: 136.16  E-value: 4.14e-38
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614   3 GMMGTSMSMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPiMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLP 82
Cdd:pfam00115  14 FLVGGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVV 92

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  83 PSLTLLISSSLvntGVGTGWTIYPPLasaiahsgTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLdQTPLFVW 162
Cdd:pfam00115  93 LGAVLLLASFG---GATTGWTEYPPL--------VGVDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVW 160

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1404740614 163 SVAITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPA 199
Cdd:pfam00115 161 AILATAILILLAFPVLAAALLLLLLDRSLGAGGGDPL 197
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 10-202 3.38e-31

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: 119.19  E-value: 3.38e-31
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  10 SMLIRAELGQPGSLINDDQIYNVIITSHAFIMIFFMVMPIMIGgFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSLTLLI 89
Cdd:TIGR02882  72 ALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGAMLFN 150

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  90 SSSLVNTGVGTGWTIYPPLASAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFVWSVAITAL 169
Cdd:TIGR02882 151 ISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTLITTL 230

                         170       180       190
                  ....*....|....*....|....*....|...
gi 1404740614 170 LLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGG 202
Cdd:TIGR02882 231 IIIFAFPVLTVALALMTTDRIFDTAFFTVAHGG 263
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 30-202 4.35e-29

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 113.11  E-value: 4.35e-29
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614  30 YNVIITSHAFIMIFFMVMPIMIGgFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSLTLLISSSLVNTGVGTGWTIYPPLA 109
Cdd:PRK15017   99 YDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPPLS 177

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1404740614 110 SAIAHSGTSVDLAIFSLHLAGVSSILGAVNFITTSINMKSKNMSLDQTPLFVWSVAITALLLLLSLPVLAGAITMLLTDR 189
Cdd:PRK15017  178 GIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTLDR 257

                         170
                  ....*....|...
gi 1404740614 190 NLNTSFFDPAGGG 202
Cdd:PRK15017  258 YLGTHFFTNDMGG 270
 
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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