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Conserved domains on  [gi|2126712907|gb|UDW38213|]
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cytochrome oxidase subunit I, partial (mitochondrion) [Atta cephalotes]

Protein Classification

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 ...
 1-102 1.96e-66

Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in the respiratory chains of prokaryotes and mitochondria which catalyze the reduction of O2 and simultaneously pump protons across the membrane. The superfamily is diverse in terms of electron donors, subunit composition, and heme types. The number of subunits varies from three to five in bacteria and up to 13 in mammalian mitochondria. It has been proposed that Archaea acquired heme-copper oxidases through gene transfer from Gram-positive bacteria. Membership in the superfamily is defined by subunit I, which contains a heme-copper binuclear center (the active site where O2 is reduced to water) formed by a high-spin heme and a copper ion. It also contains a low-spin heme, believed to participate in the transfer of electrons to the binuclear center. Only subunit I is common to the entire superfamily. For every reduction of an O2 molecule, eight protons are taken from the inside aqueous compartment and four electrons are taken from the electron donor on the opposite side of the membrane. The four electrons and four of the protons are used in the reduction of O2; the four remaining protons are pumped across the membrane. This charge separation of four charges contributes to the electrochemical gradient used for ATP synthesis. Two proton channels, the D-pathway and K-pathway, leading to the binuclear center have been identified in subunit I of cytochrome c oxidase (CcO) and ubiquinol oxidase. A well-defined pathway for the transfer of pumped protons beyond the binuclear center has not been identified. Electron transfer occurs in two segments: from the electron donor to the low-spin heme, and from the low-spin heme to the binuclear center. The first segment can be a multi-step process and varies among the different families, while the second segment, a direct transfer, is consistent throughout the superfamily.


The actual alignment was detected with superfamily member MTH00153:

Pssm-ID: 469701  Cd Length: 511  Bit Score: 207.41  E-value: 1.96e-66
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00153  260 SGKKETFGTLGMIYAMLAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKIFSWLATLHGSQINYSPSLLWA 339

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00153  340 LGFVFLFTIGGLTGVVLANSSI 361
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-102 1.96e-66

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 207.41  E-value: 1.96e-66
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00153  260 SGKKETFGTLGMIYAMLAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKIFSWLATLHGSQINYSPSLLWA 339

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00153  340 LGFVFLFTIGGLTGVVLANSSI 361
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-102 3.67e-60

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: 190.77  E-value: 3.67e-60
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:cd01663   253 SGKKPVFGYLGMVYAMLSIGILGFIVWAHHMFTVGLDVDTRAYFTAATMIIAVPTGIKVFSWLATMWGGSIKFETPMLWA 332

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:cd01663   333 LGFIFLFTIGGLTGVVLANSSL 354
CtaD_CoxA TIGR02891
cytochrome c oxidase, subunit I; This large family represents subunit I's (CtaD, CoxA, CaaA) ...
 3-102 1.18e-33

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: 120.79  E-value: 1.18e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:TIGR02891 256 RKPIFGYRAMVYATVAIGFLSFGVWAHHMFTTGMPPLALAFFSAATMLIAVPTGVKVFNWIATLWGGSIRFTTPMLFALG 335

                          90       100
                  ....*....|....*....|
gi 2126712907  83 FIFLFSIGGLTGIMLSNSSI 102
Cdd:TIGR02891 336 FIFLFVIGGLTGVMLASVPL 355
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
3-102 6.10e-33

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 119.08  E-value: 6.10e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:COG0843   265 RKPLFGYKAMVLATVAIAFLSFLVWAHHMFTPGISPLVKAFFSIATMLIAVPTGVKVFNWIATMWRGRIRFTTPMLFALG 344

                          90       100
                  ....*....|....*....|
gi 2126712907  83 FIFLFSIGGLTGIMLSNSSI 102
Cdd:COG0843   345 FIILFVIGGLTGVMLASVPL 364
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 3-102 8.54e-23

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: 90.32  E-value: 8.54e-23
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFN-PALWWSL 81
Cdd:pfam00115 231 GRPLFGYKLSVLAFWLIAFLGFLVWAHHLFTTGLPPWLQALFSVFSMLIAVPSGVKVFNWLATLWGGWIRFRtTPMLFFL 310

                          90       100
                  ....*....|....*....|.
gi 2126712907  82 GFIFLFSIGGLTGIMLSNSSI 102
Cdd:pfam00115 311 GFAFLFIIGGLTGVMLALPPV 331
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-102 1.96e-66

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 207.41  E-value: 1.96e-66
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00153  260 SGKKETFGTLGMIYAMLAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKIFSWLATLHGSQINYSPSLLWA 339

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00153  340 LGFVFLFTIGGLTGVVLANSSI 361
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-102 3.67e-60

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: 190.77  E-value: 3.67e-60
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:cd01663   253 SGKKPVFGYLGMVYAMLSIGILGFIVWAHHMFTVGLDVDTRAYFTAATMIIAVPTGIKVFSWLATMWGGSIKFETPMLWA 332

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:cd01663   333 LGFIFLFTIGGLTGVVLANSSL 354
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-102 9.99e-54

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 174.40  E-value: 9.99e-54
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00223  259 SSKKEVFGTLGMIYAMLSIGVLGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVFSWLATIYGSKIKYEAPMLWA 338

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00223  339 LGFIFLFTVGGLTGIILSNSSL 360
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-102 1.32e-53

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 174.12  E-value: 1.32e-53
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00116  262 AGKKEPFGYMGMVWAMLSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGIKVFSWLATLHGGTIKWDPPMLWA 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00116  342 LGFIFLFTIGGLTGIVLANSSL 363
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-102 3.05e-53

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 173.37  E-value: 3.05e-53
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00142  260 SGKKEVFGTLGMIYAMLSIGLLGFIVWAHHMFTVGMDVDTRAYFTAATMVIAVPTGIKVFSWLATLHGSKVKYEPPMLWA 339

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00142  340 LGFIFLFTVGGLTGIVLANSSL 361
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-102 3.84e-53

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 172.94  E-value: 3.84e-53
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00167  262 SGKKEPFGYMGMVWAMMAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKVFSWLATLHGGKIKWETPMLWA 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00167  342 LGFIFLFTVGGLTGIVLANSSL 363
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-102 1.82e-48

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 160.62  E-value: 1.82e-48
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00079  262 TGKKEVFGSLGMVYAILSIGLIGCVVWAHHMYTVGMDLDSRAYFTAATMVIAVPTGVKVFSWLATLFGMKMKFQPLLLWV 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00079  342 LGFIFLFTIGGLTGVILSNSSL 363
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-102 5.20e-48

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 159.66  E-value: 5.20e-48
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00103  262 SGKKEPFGYMGMVWAMMSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGVKVFSWLATLHGGNIKWSPAMLWA 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00103  342 LGFIFLFTVGGLTGIVLANSSL 363
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-102 7.19e-47

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 156.60  E-value: 7.19e-47
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00007  259 AGKLEPFGTLGMIYAMLGIGVLGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVFSWLATIHGSPIKYETPMLWA 338

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00007  339 LGFIFLFTTGGLTGIVLSNSSL 360
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-102 1.66e-46

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 155.37  E-value: 1.66e-46
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00037  262 SGKQEPFGYLGMVYAMIAIGILGFLVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVFSWMATLQGSNLRWETPLLWA 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00037  342 LGFVFLFTIGGLTGIVLANSSI 363
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-102 1.84e-46

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 155.47  E-value: 1.84e-46
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00183  262 SGKKEPFGYMGMVWAMMAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGVKVFSWLATLHGGSIKWETPLLWA 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00183  342 LGFIFLFTVGGLTGIVLANSSL 363
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-102 8.56e-45

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 150.86  E-value: 8.56e-45
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00077  262 SAKKEPFGYMGMVWAMMSIGLLGFIVWAHHMFTVDLNVDTRAYFTSATMIIAIPTGVKVFSWLATMHGGAIKWDAAMLWA 341

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00077  342 LGFIFLFTVGGLTGIVLANSSL 363
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-102 9.53e-42

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 143.04  E-value: 9.53e-42
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00182  264 VAKKQIFGYLGMVYAMLSIGILGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKVFSWLATIYGGTLRLDTPMLWA 343

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00182  344 MGFVFLFTLGGLTGVVLANSSL 365
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-102 1.16e-39

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 137.27  E-value: 1.16e-39
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWS 80
Cdd:MTH00184  264 AAKKQIFGYLGMVYAMVSIGILGFIVWAHHMFTVGMDVDTRAYFTAATMIIAVPTGIKIFSWIATIFGGSLRLDTPMLWA 343

                          90       100
                  ....*....|....*....|..
gi 2126712907  81 LGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00184  344 IGFVFLFTMGGLTGIVLANSSL 365
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 3-102 4.13e-36

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: 126.88  E-value: 4.13e-36
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:cd00919   251 GKPLFGYKLMVYAFLAIGFLSFLVWAHHMFTVGLPVDTRAYFTAATMIIAVPTGIKVFNWLATLWGGRIRFDPPMLFALG 330

                          90       100
                  ....*....|....*....|
gi 2126712907  83 FIFLFSIGGLTGIMLSNSSI 102
Cdd:cd00919   331 FLFLFTIGGLTGVVLANVPL 350
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-102 4.14e-36

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 127.82  E-value: 4.14e-36
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKIN--FNPALW 78
Cdd:MTH00026  263 SYKKQIFGYLGMVYAMLAIGVLGFIVWAHHMYVVGMDVDTRAYFTAATMIIAVPTGIKIFSWLATVSGSGRNliFTTPMA 342

                          90       100
                  ....*....|....*....|....
gi 2126712907  79 WSLGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00026  343 WALGFIFLFTIGGLTGIVLSNSSL 366
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 1-102 6.74e-34

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 121.71  E-value: 6.74e-34
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   1 SGKKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINF-NPALWW 79
Cdd:MTH00048  260 SNNDDPFGYYGLVFAMFSIVCLGSVVWAHHMFTVGLDVKTAVFFSSVTMIIGVPTGIKVFSWLYMLLNSRVRKsDPVVWW 339

                          90       100
                  ....*....|....*....|...
gi 2126712907  80 SLGFIFLFSIGGLTGIMLSNSSI 102
Cdd:MTH00048  340 VVSFIVLFTIGGVTGIVLSASVL 362
CtaD_CoxA TIGR02891
cytochrome c oxidase, subunit I; This large family represents subunit I's (CtaD, CoxA, CaaA) ...
 3-102 1.18e-33

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: 120.79  E-value: 1.18e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:TIGR02891 256 RKPIFGYRAMVYATVAIGFLSFGVWAHHMFTTGMPPLALAFFSAATMLIAVPTGVKVFNWIATLWGGSIRFTTPMLFALG 335

                          90       100
                  ....*....|....*....|
gi 2126712907  83 FIFLFSIGGLTGIMLSNSSI 102
Cdd:TIGR02891 336 FIFLFVIGGLTGVMLASVPL 355
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
3-102 6.10e-33

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 119.08  E-value: 6.10e-33
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:COG0843   265 RKPLFGYKAMVLATVAIAFLSFLVWAHHMFTPGISPLVKAFFSIATMLIAVPTGVKVFNWIATMWRGRIRFTTPMLFALG 344

                          90       100
                  ....*....|....*....|
gi 2126712907  83 FIFLFSIGGLTGIMLSNSSI 102
Cdd:COG0843   345 FIILFVIGGLTGVMLASVPL 364
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 3-98 7.10e-32

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: 116.14  E-value: 7.10e-32
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:cd01662   257 RKPLFGYRSMVYATVAIGFLSFGVWVHHMFTTGAGALVNAFFSIATMIIAVPTGVKIFNWLFTMWRGRIRFETPMLWAIG 336

                          90
                  ....*....|....*.
gi 2126712907  83 FIFLFSIGGLTGIMLS 98
Cdd:cd01662   337 FLVTFVIGGLTGVMLA 352
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 3-98 4.33e-25

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 97.70  E-value: 4.33e-25
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFNPALWWSLG 82
Cdd:PRK15017  307 RKRLFGYTSLVWATVCITVLSFIVWLHHFFTMGAGANVNAFFGITTMIIAIPTGVKIFNWLFTMYQGRIVFHSAMLWTIG 386

                          90
                  ....*....|....*.
gi 2126712907  83 FIFLFSIGGLTGIMLS 98
Cdd:PRK15017  387 FIVTFSVGGMTGVLLA 402
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 3-102 8.54e-23

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: 90.32  E-value: 8.54e-23
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 2126712907   3 KKETFGTLGMIYAMMAIGLLGFIVWAHHMFTIGLDVDTRAYFTSATLIIAIPTGIKVFSWLATLHGMKINFN-PALWWSL 81
Cdd:pfam00115 231 GRPLFGYKLSVLAFWLIAFLGFLVWAHHLFTTGLPPWLQALFSVFSMLIAVPSGVKVFNWLATLWGGWIRFRtTPMLFFL 310

                          90       100
                  ....*....|....*....|.
gi 2126712907  82 GFIFLFSIGGLTGIMLSNSSI 102
Cdd:pfam00115 311 GFAFLFIIGGLTGVMLALPPV 331
 
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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