NCBI Home Page NCBI Site Search page NCBI Guide that lists and describes the NCBI resources
Conserved domains on  [gi|164449464|gb|ABY56202|]
View 

cytochrome oxidase subunit 1, partial (mitochondrion) [Notothenia coriiceps]

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

 Zoom to residue level

show extra options »

Show site features     Horizontal zoom: ×

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 ...
 1-205 1.31e-135

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 MTH00183:

Pssm-ID: 469701  Cd Length: 516  Bit Score: 389.67  E-value: 1.31e-135
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00183  30 GTALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00183 110 LLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00183 190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 234
 
Name Accession Description Interval E-value
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-205 1.31e-135

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 389.67  E-value: 1.31e-135
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00183  30 GTALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00183 110 LLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00183 190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 234
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-205 3.06e-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: 354.48  E-value: 3.06e-122
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:cd01663   21 GTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSL 100

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:cd01663  101 LLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSVL 180

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:cd01663  181 ITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHL 225
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-205 1.20e-67

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 215.76  E-value: 1.20e-67
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPiMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:COG0843   33 GGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGG 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:COG0843  112 LLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAAL 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:COG0843  192 VTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHL 236
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-205 1.24e-42

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: 148.10  E-value: 1.24e-42
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464    1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPiMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:pfam00115  17 GGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGA 95

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   81 LLLLASSGveaGAGTGWTVYPPLSGnlahagasVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQyQTPLFVWAVL 160
Cdd:pfam00115  96 VLLLASFG---GATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAIL 163

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*
gi 164449464  161 ITAVLLLLSLPVLAAGITMLLTDRNLNttffdpAGGGDPILYQHL 205
Cdd:pfam00115 164 ATAILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHL 202
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 1-205 1.20e-35

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: 131.90  E-value: 1.20e-35
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464    1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGgFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:TIGR02882  68 GGIDALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGA 146

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:TIGR02882 147 MLFNISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTL 226

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*
gi 164449464  161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:TIGR02882 227 ITTLIIIFAFPVLTVALALMTTDRIFDTAFFTVAHGGMPMLWANL 271
 
Name Accession Description Interval E-value
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-205 1.31e-135

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 389.67  E-value: 1.31e-135
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00183  30 GTALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00183 110 LLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00183 190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 234
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-205 7.88e-134

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 385.00  E-value: 7.88e-134
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00103  30 GTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00103 110 LLLLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMSQYQTPLFVWSVL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00103 190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 234
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-205 4.83e-130

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 375.36  E-value: 4.83e-130
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00153  28 GTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSL 107

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00153 108 TLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVL 187

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00153 188 ITAILLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHL 232
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-205 5.19e-127

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 367.50  E-value: 5.19e-127
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00116  30 GTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00116 110 LLLLASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAMSQYQTPLFVWSVL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00116 190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 234
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-205 1.21e-124

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 361.69  E-value: 1.21e-124
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00167  30 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSL 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00167 110 LLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGITQYQTPLFVWSIL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00167 190 VTTILLLLSLPVLAAAITMLLTDRNLNTTFFDPAGGGDPILYQHL 234
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-205 3.06e-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: 354.48  E-value: 3.06e-122
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:cd01663   21 GTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSL 100

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:cd01663  101 LLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSVL 180

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:cd01663  181 ITAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHL 225
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-205 1.19e-117

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 343.85  E-value: 1.19e-117
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00077  30 GTALSLLIRAELSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00077 110 LLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSMSQYQTPLFVWSVL 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00077 190 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPVLYQHL 234
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-205 2.14e-113

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 332.84  E-value: 2.14e-113
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00142  28 GTGLSLLIRAELGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPAL 107

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00142 108 LLLLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGMKFERVPLFVWSVK 187

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00142 188 ITAILLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHL 232
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-205 2.14e-113

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 332.71  E-value: 2.14e-113
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00223  27 GTSLSLLIRAELGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPSL 106

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00223 107 YLLLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGMQLERLPLFVWSVK 186

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00223 187 VTAFLLLLSLPVLAGAITMLLTDRNFNTSFFDPAGGGDPILYQHL 231
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-205 1.11e-102

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 305.60  E-value: 1.11e-102
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00037  30 GTAMSVIIRTELAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLIPPSF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00037 110 LLLLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGMTFDRLPLFVWSVF 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00037 190 ITAFLLLLSLPVLAGAITMLLTDRNINTTFFDPAGGGDPILFQHL 234
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-205 1.34e-98

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 294.89  E-value: 1.34e-98
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00007  27 GTSMSLLIRIELGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPAL 106

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00007 107 ILLVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGLRLERIPLFVWAVV 186

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00007 187 ITVVLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHL 231
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-205 1.37e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 285.18  E-value: 1.37e-94
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00184  32 GTAFSMLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPAL 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00184 112 TLLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGITMDRMPLFVWSIL 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00184 192 VTTFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHL 236
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-205 1.89e-94

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 284.79  E-value: 1.89e-94
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00182  32 GTAFSMLIRLELSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNISFWLLPPAL 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00182 112 ILLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGVTFNRLPLFVWSIL 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00182 192 ITAFLLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILFQHL 236
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-205 1.09e-87

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 266.93  E-value: 1.09e-87
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00079  31 GTSLSLIIRLELSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSFWLLPTSL 110

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSgNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00079 111 FLILDSCFVDMGPGTSWTVYPPLS-TLGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSISLEHMSLFVWTVF 189

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00079 190 VTVFLLVLSLPVLAGAITMLLTDRNLNTSFFDPSTGGNPLLYQHL 234
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-205 2.37e-85

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 261.87  E-value: 2.37e-85
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00026  31 GTAFSMLIRLELSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNISFWLLPPAL 110

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:MTH00026 111 FLLLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGMTMSRIPLFVWSVF 190

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00026 191 ITAILLLLSLPVLAGAITMLLTDRNFNTTFFDPAGGGDPILYQHL 235
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-205 6.73e-77

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: 237.81  E-value: 6.73e-77
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPlMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:cd00919   19 GGLLALLIRLELATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPP-LIGARDLAFPRLNNLSFWLFPPGL 97

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:cd00919   98 LLLLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGMTLDKMPLFVWSVL 177

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:cd00919  178 VTAILLLLALPVLAAALVMLLLDRNFGTSFFDPAGGGDPVLYQHL 222
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-205 1.20e-67

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 215.76  E-value: 1.20e-67
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPiMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:COG0843   33 GGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGG 111

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:COG0843  112 LLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAAL 191

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:COG0843  192 VTSILILLAFPVLAAALLLLLLDRSLGTHFFDPAGGGDPLLWQHL 236
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 1-205 4.52e-59

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 192.97  E-value: 4.52e-59
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:MTH00048  31 GLSLSLLIRLNFLDPYYNVISLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSAWLLVPSI 110

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASsgVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISqYQTPLFVWAVL 160
Cdd:MTH00048 111 VFLLLS--MCLGAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNVF-SRTSIILWSYL 187

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:MTH00048 188 FTSILLLLSLPVLAAAITMLLFDRNFGSAFFDPLGGGDPVLFQHM 232
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 1-205 8.85e-58

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: 189.33  E-value: 8.85e-58
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGgFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:cd01662   25 GGVDALLMRTQLALPGNDFLSPEHYNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFGG 103

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:cd01662  104 LLLNASLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTWTTL 183

                        170       180       190       200
                 ....*....|....*....|....*....|....*....|....*
gi 164449464 161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:cd01662  184 VTSILILFAFPVLTAALALLELDRYFGTHFFTNALGGNPMLWQHL 228
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-205 1.24e-42

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: 148.10  E-value: 1.24e-42
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464    1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPiMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:pfam00115  17 GGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGA 95

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   81 LLLLASSGveaGAGTGWTVYPPLSGnlahagasVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQyQTPLFVWAVL 160
Cdd:pfam00115  96 VLLLASFG---GATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAIL 163

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*
gi 164449464  161 ITAVLLLLSLPVLAAGITMLLTDRNLNttffdpAGGGDPILYQHL 205
Cdd:pfam00115 164 ATAILILLAFPVLAAALLLLLLDRSLG------AGGGDPLLDQHL 202
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 25-205 9.17e-37

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 135.06  E-value: 9.17e-37
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464  25 YNVIVTAHAFVMIFFMVMPIMIGgFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEAGAGTGWTVYPPLS 104
Cdd:PRK15017  99 YDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPPLS 177

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464 105 GNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVLITAVLLLLSLPVLAAGITMLLTDR 184
Cdd:PRK15017 178 GIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTLDR 257

                        170       180
                 ....*....|....*....|.
gi 164449464 185 NLNTTFFDPAGGGDPILYQHL 205
Cdd:PRK15017 258 YLGTHFFTNDMGGNMMMYINL 278
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 1-205 1.20e-35

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: 131.90  E-value: 1.20e-35
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464    1 GTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGgFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSF 80
Cdd:TIGR02882  68 GGIDALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGA 146

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 164449464   81 LLLLASSGVEAGAGTGWTVYPPLSGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAISQYQTPLFVWAVL 160
Cdd:TIGR02882 147 MLFNISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTL 226

                         170       180       190       200
                  ....*....|....*....|....*....|....*....|....*
gi 164449464  161 ITAVLLLLSLPVLAAGITMLLTDRNLNTTFFDPAGGGDPILYQHL 205
Cdd:TIGR02882 227 ITTLIIIFAFPVLTVALALMTTDRIFDTAFFTVAHGGMPMLWANL 271
 
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.
Help | Disclaimer | Write to the Help Desk
NCBI | NLM | NIH