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Conserved domains on  [gi|254575733|gb|ACT68354|]
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cytochrome oxidase subunit I, partial (mitochondrion) [Flatocerus nankunshanensis]

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 ...
 14-222 4.93e-128

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: 371.12  E-value: 4.93e-128
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00153  30 SLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLTL 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00153 110 LLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVLIT 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00153 190 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 238
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 14-222 4.93e-128

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 371.12  E-value: 4.93e-128
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00153  30 SLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLTL 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00153 110 LLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVLIT 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00153 190 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 238
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 14-222 1.36e-122

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: 356.41  E-value: 1.36e-122
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:cd01663   23 SLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSLLL 102

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:cd01663  103 LLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSVLIT 182

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:cd01663  183 AFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFGH 231
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
15-222 5.08e-69

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 220.38  E-value: 5.08e-69
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  15 FSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPiMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLL 94
Cdd:COG0843   36 LALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGGLLL 114

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  95 LSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMITA 174
Cdd:COG0843  115 LISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAALVTS 194

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*...
gi 254575733 175 ILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:COG0843  195 ILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHLFWFFGH 242
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 15-222 5.33e-41

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: 144.64  E-value: 5.33e-41
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   15 FSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPiMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLL 94
Cdd:pfam00115  20 LGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGAVLL 98

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   95 LSSSMvdcGVGTGWTVYPPLSGqmahsgpaIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMdQIPLFVWSVMITA 174
Cdd:pfam00115  99 LASFG---GATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAILATA 166

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 254575733  175 ILLLLSLPVLAGAITMLLTDRNLNtsffdpAGGGDPILYQHLFWFFGH 222
Cdd:pfam00115 167 ILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHLFWWFGH 208
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 14-222 4.93e-128

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 371.12  E-value: 4.93e-128
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00153  30 SLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLTL 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00153 110 LLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVLIT 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00153 190 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 238
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 14-222 1.36e-122

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: 356.41  E-value: 1.36e-122
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:cd01663   23 SLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSLLL 102

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:cd01663  103 LLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSVLIT 182

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:cd01663  183 AFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFGH 231
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 8-222 5.98e-115

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 337.80  E-value: 5.98e-115
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   8 WAAFWDS-FSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWL 86
Cdd:MTH00167  25 WAGMVGTaLSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWL 104

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  87 LPPSLTLLLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLF 166
Cdd:MTH00167 105 LPPSLLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGITQYQTPLF 184

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 254575733 167 VWSVMITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00167 185 VWSILVTTILLLLSLPVLAAAITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFGH 240
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 16-222 2.60e-114

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 336.29  E-value: 2.60e-114
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  16 SMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLLL 95
Cdd:MTH00116  34 SLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLL 113

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  96 SSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMITAI 175
Cdd:MTH00116 114 ASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAMSQYQTPLFVWSVLITAV 193

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*..
gi 254575733 176 LLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00116 194 LLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFGH 240
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 14-222 9.03e-110

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 324.62  E-value: 9.03e-110
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00223  29 SLSLLIRAELGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPSLYL 108

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00223 109 LLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGMQLERLPLFVWSVKVT 188

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00223 189 AFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFGH 237
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 14-222 9.71e-109

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 321.67  E-value: 9.71e-109
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00142  30 GLSLLIRAELGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPALLL 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00142 110 LLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGMKFERVPLFVWSVKIT 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00142 190 AILLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHLFWFFGH 238
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 14-222 2.91e-100

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 300.32  E-value: 2.91e-100
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00077  32 ALSLLIRAELSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLL 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00077 112 LLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSMSQYQTPLFVWSVLIT 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00077 192 AVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPVLYQHLFWFFGH 240
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 14-222 5.95e-99

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 296.81  E-value: 5.95e-99
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00007  29 SMSLLIRIELGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPALIL 108

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00007 109 LVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGLRLERIPLFVWAVVIT 188

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00007 189 VVLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 237
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 14-222 1.75e-98

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 295.64  E-value: 1.75e-98
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00103  32 ALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLL 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00103 112 LLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMSQYQTPLFVWSVLIT 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00103 192 AVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFGH 240
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 14-222 1.15e-97

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 293.75  E-value: 1.15e-97
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00183  32 ALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFLL 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00183 112 LLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVLIT 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00183 192 AVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHLFWFFGH 240
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 14-222 3.30e-97

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 292.50  E-value: 3.30e-97
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00037  32 AMSVIIRTELAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLIPPSFLL 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00037 112 LLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGMTFDRLPLFVWSVFIT 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00037 192 AFLLLLSLPVLAGAITMLLTDRNINTTFFDPAGGGDPILFQHLFWFFGH 240
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 14-222 3.43e-95

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 287.49  E-value: 3.43e-95
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00182  34 AFSMLIRLELSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNISFWLLPPALIL 113

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00182 114 LLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGVTFNRLPLFVWSILIT 193

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00182 194 AFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILFQHLFWFFGH 242
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 14-222 2.14e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 285.04  E-value: 2.14e-94
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00079  33 SLSLIIRLELSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSFWLLPTSLFL 112

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSgQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00079 113 ILDSCFVDMGPGTSWTVYPPLS-TLGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSISLEHMSLFVWTVFVT 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00079 192 VFLLVLSLPVLAGAITMLLTDRNLNTSFFDPSTGGNPLLYQHLFWFFGH 240
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 14-222 3.97e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 284.80  E-value: 3.97e-94
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:MTH00184  34 AFSMLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPALTL 113

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:MTH00184 114 LLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGITMDRMPLFVWSILVT 193

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00184 194 TFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHLFWFFGH 242
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 9-222 1.93e-87

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 268.03  E-value: 1.93e-87
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   9 AAFWDSFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLP 88
Cdd:MTH00026  28 GAIGTAFSMLIRLELSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNISFWLLP 107

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  89 PSLTLLLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVW 168
Cdd:MTH00026 108 PALFLLLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGMTMSRIPLFVW 187

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|....
gi 254575733 169 SVMITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00026 188 SVFITAILLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHLFWFFGH 241
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 14-222 1.01e-76

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: 238.20  E-value: 1.01e-76
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  14 SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLlPLMIGAPDMAFPRMNNMSFWLLPPSLTL 93
Cdd:cd00919   21 LLALLIRLELATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLL-PPLIGARDLAFPRLNNLSFWLFPPGLLL 99

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  94 LLSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMIT 173
Cdd:cd00919  100 LLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGMTLDKMPLFVWSVLVT 179

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*....
gi 254575733 174 AILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:cd00919  180 AILLLLALPVLAAALVMLLLDRNFGTSFFDPAGGGDPVLYQHLFWFFGH 228
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
15-222 5.08e-69

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 220.38  E-value: 5.08e-69
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  15 FSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPiMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLL 94
Cdd:COG0843   36 LALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGGLLL 114

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  95 LSSSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMITA 174
Cdd:COG0843  115 LISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAALVTS 194

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*...
gi 254575733 175 ILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:COG0843  195 ILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHLFWFFGH 242
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 8-222 2.21e-62

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 202.60  E-value: 2.21e-62
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   8 WAAFWD-SFSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWL 86
Cdd:MTH00048  26 WSGFVGlSLSLLIRLNFLDPYYNVISLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSAWL 105

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  87 LPPSLTLLLSSSMVDCGVGtgWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMdQIPLF 166
Cdd:MTH00048 106 LVPSIVFLLLSMCLGAGVG--WTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNVFS-RTSII 182

                        170       180       190       200       210
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 254575733 167 VWSVMITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:MTH00048 183 LWSYLFTSILLLLSLPVLAAAITMLLFDRNFGSAFFDPLGGGDPVLFQHMFWFFGH 238
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 17-222 2.62e-55

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: 183.55  E-value: 2.62e-55
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  17 MLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPIMIGgFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLLLS 96
Cdd:cd01662   30 LLMRTQLALPGNDFLSPEHYNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFGGLLLNA 108

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  97 SSMVDCGVGTGWTVYPPLSGQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMITAIL 176
Cdd:cd01662  109 SLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTWTTLVTSIL 188

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*.
gi 254575733 177 LLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:cd01662  189 ILFAFPVLTAALALLELDRYFGTHFFTNALGGNPMLWQHLFWIFGH 234
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 15-222 5.33e-41

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: 144.64  E-value: 5.33e-41
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   15 FSMLIRMELSTPGHLINNEQLYNVIVTSHAFIMIFFMVMPiMIGGFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLL 94
Cdd:pfam00115  20 LGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGAVLL 98

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733   95 LSSSMvdcGVGTGWTVYPPLSGqmahsgpaIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMdQIPLFVWSVMITA 174
Cdd:pfam00115  99 LASFG---GATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAILATA 166

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*...
gi 254575733  175 ILLLLSLPVLAGAITMLLTDRNLNtsffdpAGGGDPILYQHLFWFFGH 222
Cdd:pfam00115 167 ILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHLFWWFGH 208
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 36-222 8.93e-33

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 124.66  E-value: 8.93e-33
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733  36 YNVIVTSHAFIMIFFMVMPIMIGgFGNWLLPLMIGAPDMAFPRMNNMSFWLLPPSLTLLLSSSMVDCGVGTGWTVYPPLS 115
Cdd:PRK15017  99 YDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPPLS 177

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 254575733 116 GQMAHSGPAIDLAIFSLHLAGASSILGAINFITTTMNMKSSSLTMDQIPLFVWSVMITAILLLLSLPVLAGAITMLLTDR 195
Cdd:PRK15017 178 GIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTLDR 257

                        170       180
                 ....*....|....*....|....*..
gi 254575733 196 NLNTSFFDPAGGGDPILYQHLFWFFGH 222
Cdd:PRK15017 258 YLGTHFFTNDMGGNMMMYINLIWAWGH 284
 
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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