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Conserved domains on  [gi|1101488749|gb|APC02642|]
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cytochrome oxidase subunit I, partial (mitochondrion) [Etrumeus micropus]

Protein Classification

heme-copper oxidase family protein( domain architecture ID 14)

heme-copper oxidase family protein may catalyze the transfer of electrons from an electron donor onto molecular oxygen

Graphical summary

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List of domain hits

 Name Accession Description Interval E-value
Heme_Cu_Oxidase_I super family cl00275
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-184 2.01e-118

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: 344.98  E-value: 2.01e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00183   41 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00183  121 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVLITAVLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00183  201 VLAAGITMLLTDRNLNTTFFDPAG 224
 
Name Accession Description Interval E-value
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-184 2.01e-118

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 344.98  E-value: 2.01e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00183   41 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00183  121 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVLITAVLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00183  201 VLAAGITMLLTDRNLNTTFFDPAG 224
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-184 6.65e-103

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: 304.41  E-value: 6.65e-103
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:cd01663    32 LSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSLLLLLLSALVEG 111

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:cd01663   112 GAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSVLITAFLLLLSLP 191

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:cd01663   192 VLAGAITMLLTDRNFNTSFFDPAG 215
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-184 3.81e-53

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 176.86  E-value: 3.81e-53
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIlIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:COG0843    44 LAGPGLGLLSPETYNQLFTMHGTIMIFFFATPF-LAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGGLLLLISLFVGG 122

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:COG0843   123 AADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAALVTSILILLAFP 202

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:COG0843   203 VLAAALLLLLLDRSLGTHFFDPAG 226
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-183 1.03e-34

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: 126.15  E-value: 1.03e-34
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIlIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGvea 80
Cdd:pfam00115  28 LAFPGLNFLSPLTYNQLRTLHGNLMIFWFATPF-LFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGAVLLLASFG--- 103

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGnlahagasVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQyQTPLFVWSVLITAVLLLLSLP 160
Cdd:pfam00115 104 GATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAILATAILILLAFP 174

                         170       180
                  ....*....|....*....|...
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPA 183
Cdd:pfam00115 175 VLAAALLLLLLDRSLGAGGGDPL 197
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 1-183 3.06e-30

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: 115.72  E-value: 3.06e-30
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGgFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:TIGR02882  79 LTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGAMLFNISFVIGG 157

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:TIGR02882 158 SPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTLITTLIIIFAFP 237

                         170       180
                  ....*....|....*....|...
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPA 183
Cdd:TIGR02882 238 VLTVALALMTTDRIFDTAFFTVA 260
 
Name Accession Description Interval E-value
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-184 2.01e-118

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 344.98  E-value: 2.01e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00183   41 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00183  121 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQTPLFVWAVLITAVLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00183  201 VLAAGITMLLTDRNLNTTFFDPAG 224
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-184 4.14e-118

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 344.23  E-value: 4.14e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00077   41 LSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00077  121 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSMSQYQTPLFVWSVLITAVLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00077  201 VLAAGITMLLTDRNLNTTFFDPAG 224
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-184 9.46e-118

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 343.02  E-value: 9.46e-118
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00103   41 LGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSMVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00103  121 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMSQYQTPLFVWSVLITAVLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00103  201 VLAAGITMLLTDRNLNTTFFDPAG 224
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-184 1.50e-110

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 324.51  E-value: 1.50e-110
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00153   39 LGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSLTLLLSSSMVES 118

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00153  119 GAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMPLFVWSVLITAILLLLSLP 198

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00153  199 VLAGAITMLLTDRNLNTSFFDPAG 222
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-184 5.94e-110

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 323.20  E-value: 5.94e-110
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00116   41 LGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSFLLLLASSTVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00116  121 GAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAMSQYQTPLFVWSVLITAVLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00116  201 VLAAGITMLLTDRNLNTTFFDPAG 224
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-184 5.64e-106

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 313.15  E-value: 5.64e-106
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00167   41 LSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSFWLLPPSLLLLLASSGVEA 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00167  121 GAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGITQYQTPLFVWSILVTTILLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00167  201 VLAAAITMLLTDRNLNTTFFDPAG 224
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-184 6.65e-103

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: 304.41  E-value: 6.65e-103
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:cd01663    32 LSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSFWLLPPSLLLLLLSALVEG 111

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:cd01663   112 GAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMPLFVWSVLITAFLLLLSLP 191

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:cd01663   192 VLAGAITMLLTDRNFNTSFFDPAG 215
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-184 1.00e-96

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 289.32  E-value: 1.00e-96
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00142   39 LGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPALLLLLSSAAVES 118

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00142  119 GAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGMKFERVPLFVWSVKITAILLLLSLP 198

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00142  199 VLAGAITMLLTDRNFNTSFFDPAG 222
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-184 1.69e-95

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 286.10  E-value: 1.69e-95
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00223   38 LGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPSLYLLLSSSAVES 117

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00223  118 GVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGMQLERLPLFVWSVKVTAFLLLLSLP 197

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00223  198 VLAGAITMLLTDRNFNTSFFDPAG 221
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-184 4.99e-87

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 264.77  E-value: 4.99e-87
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00037   41 LAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMSFWLIPPSFLLLLASAGVES 120

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00037  121 GAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGMTFDRLPLFVWSVFITAFLLLLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00037  201 VLAGAITMLLTDRNINTTFFDPAG 224
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-184 1.78e-84

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 257.91  E-value: 1.78e-84
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00007   38 LGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPALILLVSSAAVEK 117

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00007  118 GVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGLRLERIPLFVWAVVITVVLLLLSLP 197

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00007  198 VLAGAITMLLTDRNLNTSFFDPAG 221
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-184 2.17e-80

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 247.81  E-value: 2.17e-80
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00182   43 LSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNISFWLLPPALILLLGSAFVEQ 122

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00182  123 GAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGVTFNRLPLFVWSILITAFLLLLSLP 202

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00182  203 VLAGAITMLLTDRNFNTTFFDPAG 226
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-184 7.79e-80

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 246.28  E-value: 7.79e-80
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00184   43 LSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNISFWLLPPALTLLLGSAFVEQ 122

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00184  123 GAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGITMDRMPLFVWSILVTTFLLLLSLP 202

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00184  203 VLAGAITMLLTDRNFNTTFFDPAG 226
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-184 1.14e-73

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 229.95  E-value: 1.14e-73
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00079   42 LSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSFWLLPTSLFLILDSCFVDM 121

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAgNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00079  122 GPGTSWTVYPPLS-TLGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSISLEHMSLFVWTVFVTVFLLVLSLP 200

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00079  201 VLAGAITMLLTDRNLNTSFFDPST 224
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-184 2.95e-72

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 227.20  E-value: 2.95e-72
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:MTH00026   42 LSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNISFWLLPPALFLLLGSSLVEQ 121

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:MTH00026  122 GAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGMTMSRIPLFVWSVFITAILLLLSLP 201

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:MTH00026  202 VLAGAITMLLTDRNFNTTFFDPAG 225
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-184 6.09e-62

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: 198.52  E-value: 6.09e-62
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPlMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:cd00919    30 LATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPP-LIGARDLAFPRLNNLSFWLFPPGLLLLLSSVLVGG 108

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:cd00919   109 GAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGMTLDKMPLFVWSVLVTAILLLLALP 188

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:cd00919   189 VLAAALVMLLLDRNFGTSFFDPAG 212
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-184 3.81e-53

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 176.86  E-value: 3.81e-53
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIlIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:COG0843    44 LAGPGLGLLSPETYNQLFTMHGTIMIFFFATPF-LAGFGNYLVPLQIGARDMAFPRLNALSFWLYLFGGLLLLISLFVGG 122

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:COG0843   123 AADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWAALVTSILILLAFP 202

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:COG0843   203 VLAAALLLLLLDRSLGTHFFDPAG 226
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 13-184 8.68e-48

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 162.54  E-value: 8.68e-48
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  13 IYNVIVTAHAFVMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASsgVEAGAGTGWTVYPPL 92
Cdd:MTH00048   54 VYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSAWLLVPSIVFLLLS--MCLGAGVGWTFYPPL 131

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  93 AGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSqYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTD 172
Cdd:MTH00048  132 SSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNVF-SRTSIILWSYLFTSILLLLSLPVLAAAITMLLFD 210

                         170
                  ....*....|..
gi 1101488749 173 RNLNTTFFDPAG 184
Cdd:MTH00048  211 RNFGSAFFDPLG 222
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 1-184 2.42e-45

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: 155.82  E-value: 2.42e-45
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGgFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:cd01662    36 LALPGNDFLSPEHYNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFGGLLLNASLLIGG 114

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:cd01662   115 FPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTWTTLVTSILILFAFP 194

                         170       180
                  ....*....|....*....|....
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPAG 184
Cdd:cd01662   195 VLTAALALLELDRYFGTHFFTNAL 218
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-183 1.03e-34

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: 126.15  E-value: 1.03e-34
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIlIGGFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGvea 80
Cdd:pfam00115  28 LAFPGLNFLSPLTYNQLRTLHGNLMIFWFATPF-LFGFGNYLVPLMIGARDMAFPRLNALSFWLVVLGAVLLLASFG--- 103

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGnlahagasVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQyQTPLFVWSVLITAVLLLLSLP 160
Cdd:pfam00115 104 GATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMPLFVWAILATAILILLAFP 174

                         170       180
                  ....*....|....*....|...
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPA 183
Cdd:pfam00115 175 VLAAALLLLLLDRSLGAGGGDPL 197
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 14-180 6.30e-34

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 126.20  E-value: 6.30e-34
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  14 YNVIVTAHAFVMIFFMVMPILIGgFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEAGAGTGWTVYPPLA 93
Cdd:PRK15017   99 YDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPPLS 177

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  94 GNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDR 173
Cdd:PRK15017  178 GIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTLDR 257


                  ....*..
gi 1101488749 174 NLNTTFF 180
Cdd:PRK15017  258 YLGTHFF 264
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 1-183 3.06e-30

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: 115.72  E-value: 3.06e-30
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749   1 LSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPILIGgFGNWLVPLMLGAPDMAFPRMNNMSFWLLPPSFLLLLASSGVEA 80
Cdd:TIGR02882  79 LTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGAMLFNISFVIGG 157

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1101488749  81 GAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGISSILGAINFITTIINMKPPAVSQYQTPLFVWSVLITAVLLLLSLP 160
Cdd:TIGR02882 158 SPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTLITTLIIIFAFP 237

                         170       180
                  ....*....|....*....|...
gi 1101488749 161 VLAAGITMLLTDRNLNTTFFDPA 183
Cdd:TIGR02882 238 VLTVALALMTTDRIFDTAFFTVA 260
 
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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