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Conserved domains on  [gi|486172232|gb|AGK91246|]
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cytochrome oxidase subunit 1, partial (mitochondrion) [Diphyscium fulvifolium]

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 ...
 1-19 6.96e-09

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: 47.17  E-value: 6.96e-09
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00153 193 LLLSLPVLAGAITMLLTDR 211
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-19 6.96e-09

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 47.17  E-value: 6.96e-09
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00153 193 LLLSLPVLAGAITMLLTDR 211
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-19 2.92e-08

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: 45.17  E-value: 2.92e-08
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:cd01663  186 LLLSLPVLAGAITMLLTDR 204
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-19 6.96e-09

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 47.17  E-value: 6.96e-09
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00153 193 LLLSLPVLAGAITMLLTDR 211
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-19 2.92e-08

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: 45.17  E-value: 2.92e-08
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:cd01663  186 LLLSLPVLAGAITMLLTDR 204
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-19 4.85e-07

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 41.97  E-value: 4.85e-07
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00167 195 LLLSLPVLAAAITMLLTDR 213
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-19 6.32e-07

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 41.50  E-value: 6.32e-07
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00223 192 LLLSLPVLAGAITMLLTDR 210
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-19 3.04e-06

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 39.71  E-value: 3.04e-06
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00142 193 LLLSLPVLAGAITMLLTDR 211
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-19 5.87e-06

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 38.92  E-value: 5.87e-06
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00116 195 LLLSLPVLAAGITMLLTDR 213
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-19 7.64e-06

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 38.51  E-value: 7.64e-06
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00079 195 LVLSLPVLAGAITMLLTDR 213
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-19 1.08e-05

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 37.88  E-value: 1.08e-05
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00182 197 LLLSLPVLAGAITMLLTDR 215
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-19 1.60e-05

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 37.50  E-value: 1.60e-05
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00184 197 LLLSLPVLAGAITMLLTDR 215
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 1-19 3.63e-05

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 36.58  E-value: 3.63e-05
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00048 193 LLLSLPVLAAAITMLLFDR 211
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-19 3.95e-04

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 33.70  E-value: 3.95e-04
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00103 195 LLLSLPVLAAGITMLLTDR 213
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-19 5.25e-04

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 33.36  E-value: 5.25e-04
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00183 195 LLLSLPVLAAGITMLLTDR 213
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-19 5.95e-04

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 32.99  E-value: 5.95e-04
                         10
                 ....*....|....*....
gi 486172232   1 LLLSLPVLAGAITMLLTDR 19
Cdd:MTH00077 195 LLLSLPVLAAGITMLLTDR 213
 
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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