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Conserved domains on  [gi|1956369429|gb|QQP17464|]
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cytochrome c oxidase subunit I, partial (mitochondrion) [Megascops atricapilla]

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 ...
 1-126 1.67e-82

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 MTH00116:

Pssm-ID: 469701  Cd Length: 515  Bit Score: 250.39  E-value: 1.67e-82
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00116  242 EVYILILPGFGIISHIVTYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00116  322 SWLATLHGGTIKWDPPMLWALGFIFLFTIGGLTGIVLANSSLDIVL 367
 
Name Accession Description Interval E-value
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-126 1.67e-82

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 250.39  E-value: 1.67e-82
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00116  242 EVYILILPGFGIISHIVTYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00116  322 SWLATLHGGTIKWDPPMLWALGFIFLFTIGGLTGIVLANSSLDIVL 367
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-126 5.17e-82

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: 248.17  E-value: 5.17e-82
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:cd01663   233 EVYILILPGFGIISHIISTFSGKKPVFGYLGMVYAMLSIGILGFIVWAHHMFTVGLDVDTRAYFTAATMIIAVPTGIKVF 312

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:cd01663   313 SWLATMWGGSIKFETPMLWALGFIFLFTIGGLTGVVLANSSLDIAL 358
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-124 3.89e-50

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 166.46  E-value: 3.89e-50
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:COG0843   244 EVYILILPAFGIVSEIIPTFSRKP-LFGYKAMVLATVAIAFLSFLVWAHHMFTPGISPLVKAFFSIATMLIAVPTGVKVF 322

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNI 124
Cdd:COG0843   323 NWIATMWRGRIRFTTPMLFALGFIILFVIGGLTGVMLASVPLDY 366
CtaD_CoxA TIGR02891
cytochrome c oxidase, subunit I; This large family represents subunit I's (CtaD, CoxA, CaaA) ...
 1-126 2.43e-49

cytochrome c oxidase, subunit I; This large family represents subunit I's (CtaD, CoxA, CaaA) of cytochrome c oxidases of bacterial origin. Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits I-III form the functional core of the enzyme complex. Subunit I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit II and heme a of subunit I to the bimetallic center formed by heme a3 and copper B. This cytochrome c oxidase shows proton pump activity across the membrane in addition to the electron transfer. In the bacilli an apparent split (paralogism) has created a sister clade (TIGR02882) encoding subunits (QoxA) of the aa3-type quinone oxidase complex which reacts directly with quinones, bypassing the interaction with soluble cytochrome c. This model attempts to exclude these sequences, placing them between the trusted and noise cutoffs. These families, as well as archaeal and eukaryotic cytochrome c subunit I's are included within the superfamily model, pfam00115. [Energy metabolism, Electron transport]


Pssm-ID: 213748  Cd Length: 499  Bit Score: 163.93  E-value: 2.43e-49
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:TIGR02891 235 EVYIIFLPAFGIISEILPTFARKP-IFGYRAMVYATVAIGFLSFGVWAHHMFTTGMPPLALAFFSAATMLIAVPTGVKVF 313

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:TIGR02891 314 NWIATLWGGSIRFTTPMLFALGFIFLFVIGGLTGVMLASVPLDWQL 359
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-124 4.19e-33

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: 119.60  E-value: 4.19e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:pfam00115 210 EVYILILPAFGIIYYILPKFAGRP-LFGYKLSVLAFWLIAFLGFLVWAHHLFTTGLPPWLQALFSVFSMLIAVPSGVKVF 288

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*
gi 1956369429  81 SWLATLHGGTIKW-DPPLLWAMGFIFLFTIGGLTGIILANSSLNI 124
Cdd:pfam00115 289 NWLATLWGGWIRFrTTPMLFFLGFAFLFIIGGLTGVMLALPPVNY 333
 
Name Accession Description Interval E-value
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-126 1.67e-82

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 250.39  E-value: 1.67e-82
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00116  242 EVYILILPGFGIISHIVTYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00116  322 SWLATLHGGTIKWDPPMLWALGFIFLFTIGGLTGIVLANSSLDIVL 367
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-126 5.17e-82

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: 248.17  E-value: 5.17e-82
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:cd01663   233 EVYILILPGFGIISHIISTFSGKKPVFGYLGMVYAMLSIGILGFIVWAHHMFTVGLDVDTRAYFTAATMIIAVPTGIKVF 312

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:cd01663   313 SWLATMWGGSIKFETPMLWALGFIFLFTIGGLTGVVLANSSLDIAL 358
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-126 2.39e-81

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 247.09  E-value: 2.39e-81
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00153  240 EVYILILPGFGMISHIISQESGKKETFGTLGMIYAMLAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKIF 319

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00153  320 SWLATLHGSQINYSPSLLWALGFVFLFTIGGLTGVVLANSSIDIIL 365
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-126 4.07e-79

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 241.50  E-value: 4.07e-79
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00167  242 EVYILILPGFGMISHIVVYYSGKKEPFGYMGMVWAMMAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00167  322 SWLATLHGGKIKWETPMLWALGFIFLFTVGGLTGIVLANSSLDIVL 367
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-126 1.17e-72

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 224.76  E-value: 1.17e-72
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00103  242 EVYILILPGFGMISHIVTYYSGKKEPFGYMGMVWAMMSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGVKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00103  322 SWLATLHGGNIKWSPAMLWALGFIFLFTVGGLTGIVLANSSLDIVL 367
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-126 4.27e-72

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 223.65  E-value: 4.27e-72
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00183  242 EVYILILPGFGMISHIVAYYSGKKEPFGYMGMVWAMMAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGVKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00183  322 SWLATLHGGSIKWETPLLWALGFIFLFTVGGLTGIVLANSSLDIVL 367
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-126 2.53e-71

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 221.39  E-value: 2.53e-71
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00223  239 EVYILILPGFGMISHIVSHYSSKKEVFGTLGMIYAMLSIGVLGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVF 318

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00223  319 SWLATIYGSKIKYEAPMLWALGFIFLFTVGGLTGIILSNSSLDIML 364
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-126 1.28e-70

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 219.59  E-value: 1.28e-70
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00142  240 EVYILILPGFGMISHIINHYSGKKEVFGTLGMIYAMLSIGLLGFIVWAHHMFTVGMDVDTRAYFTAATMVIAVPTGIKVF 319

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00142  320 SWLATLHGSKVKYEPPMLWALGFIFLFTVGGLTGIVLANSSLDVVL 365
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-126 1.72e-69

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 216.73  E-value: 1.72e-69
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00077  242 EVYILILPGFGMISHIVTYYSAKKEPFGYMGMVWAMMSIGLLGFIVWAHHMFTVDLNVDTRAYFTSATMIIAIPTGVKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00077  322 SWLATMHGGAIKWDAAMLWALGFIFLFTVGGLTGIVLANSSLDIVL 367
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-126 6.45e-67

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 210.07  E-value: 6.45e-67
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00037  242 EVYILILPGFGMISHVIAHYSGKQEPFGYLGMVYAMIAIGILGFLVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00037  322 SWMATLQGSNLRWETPLLWALGFVFLFTIGGLTGIVLANSSIDVVL 367
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-126 5.29e-62

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 197.05  E-value: 5.29e-62
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00007  239 EVYILILPGFGAISHIVTHYAGKLEPFGTLGMIYAMLGIGVLGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVF 318

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00007  319 SWLATIHGSPIKYETPMLWALGFIFLFTTGGLTGIVLSNSSLDIIL 364
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-126 5.66e-61

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 194.51  E-value: 5.66e-61
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00079  242 EVYILILPAFGIISQSTLYLTGKKEVFGSLGMVYAILSIGLIGCVVWAHHMYTVGMDLDSRAYFTAATMVIAVPTGVKVF 321

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00079  322 SWLATLFGMKMKFQPLLLWVLGFIFLFTIGGLTGVILSNSSLDIIL 367
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-126 1.23e-59

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 191.19  E-value: 1.23e-59
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00182  244 EVYILILPGFGMISQIIPTFVAKKQIFGYLGMVYAMLSIGILGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVF 323

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00182  324 SWLATIYGGTLRLDTPMLWAMGFVFLFTLGGLTGVVLANSSLDIVL 369
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-126 1.15e-57

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 186.19  E-value: 1.15e-57
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00184  244 EVYILILPGFGIISQIIPTFAAKKQIFGYLGMVYAMVSIGILGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKIF 323

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00184  324 SWIATIFGGSLRLDTPMLWAIGFVFLFTMGGLTGIVLANSSLDVVL 369
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-126 3.33e-51

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: 168.09  E-value: 3.33e-51
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:cd00919   230 EVYILILPAFGAISEIIPTFSGKP-LFGYKLMVYAFLAIGFLSFLVWAHHMFTVGLPVDTRAYFTAATMIIAVPTGIKVF 308

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:cd00919   309 NWLATLWGGRIRFDPPMLFALGFLFLFTIGGLTGVVLANVPLDIVL 354
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
1-124 3.89e-50

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 166.46  E-value: 3.89e-50
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:COG0843   244 EVYILILPAFGIVSEIIPTFSRKP-LFGYKAMVLATVAIAFLSFLVWAHHMFTPGISPLVKAFFSIATMLIAVPTGVKVF 322

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNI 124
Cdd:COG0843   323 NWIATMWRGRIRFTTPMLFALGFIILFVIGGLTGVMLASVPLDY 366
CtaD_CoxA TIGR02891
cytochrome c oxidase, subunit I; This large family represents subunit I's (CtaD, CoxA, CaaA) ...
 1-126 2.43e-49

cytochrome c oxidase, subunit I; This large family represents subunit I's (CtaD, CoxA, CaaA) of cytochrome c oxidases of bacterial origin. Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits I-III form the functional core of the enzyme complex. Subunit I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit II and heme a of subunit I to the bimetallic center formed by heme a3 and copper B. This cytochrome c oxidase shows proton pump activity across the membrane in addition to the electron transfer. In the bacilli an apparent split (paralogism) has created a sister clade (TIGR02882) encoding subunits (QoxA) of the aa3-type quinone oxidase complex which reacts directly with quinones, bypassing the interaction with soluble cytochrome c. This model attempts to exclude these sequences, placing them between the trusted and noise cutoffs. These families, as well as archaeal and eukaryotic cytochrome c subunit I's are included within the superfamily model, pfam00115. [Energy metabolism, Electron transport]


Pssm-ID: 213748  Cd Length: 499  Bit Score: 163.93  E-value: 2.43e-49
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:TIGR02891 235 EVYIIFLPAFGIISEILPTFARKP-IFGYRAMVYATVAIGFLSFGVWAHHMFTTGMPPLALAFFSAATMLIAVPTGVKVF 313

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:TIGR02891 314 NWIATLWGGSIRFTTPMLFALGFIFLFVIGGLTGVMLASVPLDWQL 359
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 1-126 4.80e-47

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 157.92  E-value: 4.80e-47
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00048  240 EVYVLILPGFGIISHICLSLSNNDDPFGYYGLVFAMFSIVCLGSVVWAHHMFTVGLDVKTAVFFSSVTMIIGVPTGIKVF 319

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*..
gi 1956369429  81 SWLATLHG-GTIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00048  320 SWLYMLLNsRVRKSDPVVWWVVSFIVLFTIGGVTGIVLSASVLDNVL 366
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-126 1.04e-46

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 157.48  E-value: 1.04e-46
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:MTH00026  243 EVYILILPGFGIISQILSLFSYKKQIFGYLGMVYAMLAIGVLGFIVWAHHMYVVGMDVDTRAYFTAATMIIAVPTGIKIF 322

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*...
gi 1956369429  81 SWLATLHGG--TIKWDPPLLWAMGFIFLFTIGGLTGIILANSSLNIAL 126
Cdd:MTH00026  323 SWLATVSGSgrNLIFTTPMAWALGFIFLFTIGGLTGIVLSNSSLDILL 370
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 1-118 2.17e-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: 153.51  E-value: 2.17e-45
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:cd01662   236 EVYILILPAFGIFSEIVPTFSRKP-LFGYRSMVYATVAIGFLSFGVWVHHMFTTGAGALVNAFFSIATMIIAVPTGVKIF 314

                          90       100       110
                  ....*....|....*....|....*....|....*...
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILA 118
Cdd:cd01662   315 NWLFTMWRGRIRFETPMLWAIGFLVTFVIGGLTGVMLA 352
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 1-124 4.19e-33

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: 119.60  E-value: 4.19e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAGKKePFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:pfam00115 210 EVYILILPAFGIIYYILPKFAGRP-LFGYKLSVLAFWLIAFLGFLVWAHHLFTTGLPPWLQALFSVFSMLIAVPSGVKVF 288

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*
gi 1956369429  81 SWLATLHGGTIKW-DPPLLWAMGFIFLFTIGGLTGIILANSSLNI 124
Cdd:pfam00115 289 NWLATLWGGWIRFrTTPMLFFLGFAFLFIIGGLTGVMLALPPVNY 333
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 1-118 9.18e-33

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 120.43  E-value: 9.18e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1956369429   1 EVYILILPGFGIISHVVAYYAgKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVF 80
Cdd:PRK15017  286 EVYILILPVFGVFSEIAATFS-RKRLFGYTSLVWATVCITVLSFIVWLHHFFTMGAGANVNAFFGITTMIIAIPTGVKIF 364

                          90       100       110
                  ....*....|....*....|....*....|....*...
gi 1956369429  81 SWLATLHGGTIKWDPPLLWAMGFIFLFTIGGLTGIILA 118
Cdd:PRK15017  365 NWLFTMYQGRIVFHSAMLWTIGFIVTFSVGGMTGVLLA 402
 
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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