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Conserved domains on  [gi|1906770346|gb|QNT60550|]
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cytochrome c oxidase subunit I, partial (mitochondrion) [Diaulula sandiegensis]

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 ...
 1-198 6.42e-111

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: 326.05  E-value: 6.42e-111
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00153   15 TLYFIFGAWSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPR 94

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00153   95 MNNMSFWLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGM 174

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00153  175 TLDRMPLFVWSVLITAILLLLSLPVLAGAITMLLTDRN 212
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-198 6.42e-111

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 326.05  E-value: 6.42e-111
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00153   15 TLYFIFGAWSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPR 94

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00153   95 MNNMSFWLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGM 174

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00153  175 TLDRMPLFVWSVLITAILLLLSLPVLAGAITMLLTDRN 212
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-198 1.61e-107

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: 316.73  E-value: 1.61e-107
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:cd01663     8 TLYLIFGLWSGLVGTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPR 87

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:cd01663    88 LNNLSFWLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGM 167

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:cd01663   168 TLEKMPLFVWSVLITAFLLLLSLPVLAGAITMLLTDRN 205
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
2-198 5.17e-55

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 182.63  E-value: 5.17e-55
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRM 81
Cdd:COG0843    21 MYLVTAFVFLLIGGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRL 99

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:COG0843   100 NALSFWLYLFGGLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMT 179

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1906770346 162 MERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:COG0843   180 LMRMPLFTWAALVTSILILLAFPVLAAALLLLLLDRS 216
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 2-198 7.81e-36

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: 130.00  E-value: 7.81e-36
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRM 81
Cdd:pfam00115   5 LYLVTALVWFLVGGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRL 83

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCSTlmeGGAGTGWTVYPPLSGpvghggtsVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:pfam00115  84 NALSFWLVVLGAVLLLASF---GGATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMT 152

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1906770346 162 MeRLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:pfam00115 153 L-RMPLFVWAILATAILILLAFPVLAAALLLLLLDRS 188
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 2-197 6.74e-27

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: 106.86  E-value: 6.74e-27
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRM 81
Cdd:TIGR02882  56 MYIICAVLMLFRGGIDALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVL 134

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:TIGR02882 135 NALSFWLFFAGAMLFNISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMK 214

                         170       180       190
                  ....*....|....*....|....*....|....*.
gi 1906770346 162 MERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDR 197
Cdd:TIGR02882 215 LMQMPMFTWTTLITTLIIIFAFPVLTVALALMTTDR 250
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 1-198 6.42e-111

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 326.05  E-value: 6.42e-111
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00153   15 TLYFIFGAWSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPR 94

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00153   95 MNNMSFWLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGM 174

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00153  175 TLDRMPLFVWSVLITAILLLLSLPVLAGAITMLLTDRN 212
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 1-198 1.48e-110

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 325.39  E-value: 1.48e-110
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00223   14 TLYLIFGMWSGLVGTSLSLLIRAELGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPR 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00223   94 LNNMSFWLLPPSLYLLLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGM 173

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00223  174 QLERLPLFVWSVKVTAFLLLLSLPVLAGAITMLLTDRN 211
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 1-198 1.61e-107

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: 316.73  E-value: 1.61e-107
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:cd01663     8 TLYLIFGLWSGLVGTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPR 87

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:cd01663    88 LNNLSFWLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGM 167

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:cd01663   168 TLEKMPLFVWSVLITAFLLLLSLPVLAGAITMLLTDRN 205
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 1-198 1.34e-98

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 294.66  E-value: 1.34e-98
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00167   17 TLYFIFGAWAGMVGTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPR 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00167   97 MNNMSFWLLPPSLLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGI 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00167  177 TQYQTPLFVWSILVTTILLLLSLPVLAAAITMLLTDRN 214
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-198 6.32e-96

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 288.14  E-value: 6.32e-96
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00116   17 TLYLIFGAWAGMVGTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPR 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00116   97 MNNMSFWLLPPSFLLLLASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAM 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00116  177 SQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDRN 214
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-198 1.92e-95

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 286.62  E-value: 1.92e-95
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00142   15 TLYFLFGAWAGMVGTGLSLLIRAELGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPR 94

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00142   95 MNNMSFWLLPPALLLLLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGM 174

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00142  175 KFERVPLFVWSVKITAILLLLSLPVLAGAITMLLTDRN 212
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-198 2.56e-89

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 271.32  E-value: 2.56e-89
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00037   17 TLYLIFGAWAGMVGTAMSVIIRTELAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPR 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00037   97 MNNMSFWLIPPSFLLLLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGM 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00037  177 TFDRLPLFVWSVFITAFLLLLSLPVLAGAITMLLTDRN 214
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-198 3.74e-87

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 265.59  E-value: 3.74e-87
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00103   17 TLYLLFGAWAGMVGTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPR 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00103   97 MNNMSFWLLPPSFLLLLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAM 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00103  177 SQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDRN 214
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-198 1.34e-85

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 261.41  E-value: 1.34e-85
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00077   17 TLYLVFGAWAGMVGTALSLLIRAELSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPR 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00077   97 MNNMSFWLLPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSM 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00077  177 SQYQTPLFVWSVLITAVLLLLSLPVLAAGITMLLTDRN 214
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-198 2.27e-85

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 261.01  E-value: 2.27e-85
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00183   17 TLYLVFGAWAGMVGTALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPR 96

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00183   97 MNNMSFWLLPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAI 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00183  177 SQYQTPLFVWAVLITAVLLLLSLPVLAAGITMLLTDRN 214
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-198 3.48e-85

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 260.91  E-value: 3.48e-85
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00182   19 TLYLVFGAGAGMIGTAFSMLIRLELSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPR 98

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00182   99 LNNISFWLLPPALILLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGV 178

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00182  179 TFNRLPLFVWSILITAFLLLLSLPVLAGAITMLLTDRN 216
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 1-198 1.34e-83

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 256.37  E-value: 1.34e-83
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00007   14 TLYFILGVWGGLLGTSMSLLIRIELGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPR 93

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00007   94 LNNMSFWLLPPALILLVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGL 173

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00007  174 RLERIPLFVWAVVITVVLLLLSLPVLAGAITMLLTDRN 211
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-198 4.76e-83

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 255.14  E-value: 4.76e-83
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00184   19 TLYLLFGAFAGMIGTAFSMLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPR 98

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00184   99 LNNISFWLLPPALTLLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGI 178

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00184  179 TMDRMPLFVWSILVTTFLLLLSLPVLAGAITMLLTDRN 216
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 1-198 8.22e-79

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 243.82  E-value: 8.22e-79
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00079   18 TLYFLFGLWSGMVGTSLSLIIRLELSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPR 97

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGpVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00079   98 LNNLSFWLLPTSLFLILDSCFVDMGPGTSWTVYPPLST-LGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSI 176

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00079  177 SLEHMSLFVWTVFVTVFLLVLSLPVLAGAITMLLTDRN 214
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-198 4.88e-74

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 232.21  E-value: 4.88e-74
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPR 80
Cdd:MTH00026   18 SLYLVFGALSGAIGTAFSMLIRLELSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPR 97

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:MTH00026   98 LNNISFWLLPPALFLLLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGM 177

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00026  178 TMSRIPLFVWSVFITAILLLLSLPVLAGAITMLLTDRN 215
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-198 1.04e-64

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: 206.23  E-value: 1.04e-64
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   1 TLYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLlIGAPDMSFPR 80
Cdd:cd00919     6 LLYLIFAFVALLLGGLLALLIRLELATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPPL-IGARDLAFPR 84

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  81 MNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAM 160
Cdd:cd00919    85 LNNLSFWLFPPGLLLLLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGM 164

                         170       180       190
                  ....*....|....*....|....*....|....*...
gi 1906770346 161 SMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:cd00919   165 TLDKMPLFVWSVLVTAILLLLALPVLAAALVMLLLDRN 202
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
2-198 5.17e-55

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 182.63  E-value: 5.17e-55
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRM 81
Cdd:COG0843    21 MYLVTAFVFLLIGGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRL 99

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:COG0843   100 NALSFWLYLFGGLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMT 179

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1906770346 162 MERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:COG0843   180 LMRMPLFTWAALVTSILILLAFPVLAAALLLLLLDRS 216
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 2-198 1.78e-46

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 159.46  E-value: 1.78e-46
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRM 81
Cdd:MTH00048   19 IYTLLGVWSGFVGLSLSLLIRLNFLDPYYNVISLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRL 98

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCStlMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:MTH00048   99 NALSAWLLVPSIVFLLLS--MCLGAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNVF 176

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1906770346 162 mERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:MTH00048  177 -SRTSIILWSYLFTSILLLLSLPVLAAAITMLLFDRN 212
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 21-197 1.72e-41

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: 146.19  E-value: 1.72e-41
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  21 IRFELGTAGA-FLGDDHfYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRMNNMSFWLLPPSFVLLLCS 99
Cdd:cd01662    32 MRTQLALPGNdFLSPEH-YNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFLFGGLLLNAS 109

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346 100 TLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMSMERLSLFVWSVLVTAFLL 179
Cdd:cd01662   110 LLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTWTTLVTSILI 189

                         170
                  ....*....|....*...
gi 1906770346 180 LLSLPVLAGAITMLLTDR 197
Cdd:cd01662   190 LFAFPVLTAALALLELDR 207
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 2-198 7.81e-36

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: 130.00  E-value: 7.81e-36
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRM 81
Cdd:pfam00115   5 LYLVTALVWFLVGGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRL 83

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCSTlmeGGAGTGWTVYPPLSGpvghggtsVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:pfam00115  84 NALSFWLVVLGAVLLLASF---GGATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMT 152

                         170       180       190
                  ....*....|....*....|....*....|....*..
gi 1906770346 162 MeRLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDRN 198
Cdd:pfam00115 153 L-RMPLFVWAILATAILILLAFPVLAAALLLLLLDRS 188
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 36-197 5.45e-29

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 112.72  E-value: 5.45e-29
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  36 HFYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRMNNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPP 115
Cdd:PRK15017   97 HHYDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPP 175

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346 116 LSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMSMERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLT 195
Cdd:PRK15017  176 LSGIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTL 255


                  ..
gi 1906770346 196 DR 197
Cdd:PRK15017  256 DR 257
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 2-197 6.74e-27

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: 106.86  E-value: 6.74e-27
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346   2 LYIIFGMWCGLLGTGLSLLIRFELGTAGAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRM 81
Cdd:TIGR02882  56 MYIICAVLMLFRGGIDALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVL 134

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 1906770346  82 NNMSFWLLPPSFVLLLCSTLMEGGAGTGWTVYPPLSGPVGHGGTSVDLAIFSLHLAGASSLLGAINFITTIFNMRSTAMS 161
Cdd:TIGR02882 135 NALSFWLFFAGAMLFNISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMK 214

                         170       180       190
                  ....*....|....*....|....*....|....*.
gi 1906770346 162 MERLSLFVWSVLVTAFLLLLSLPVLAGAITMLLTDR 197
Cdd:TIGR02882 215 LMQMPMFTWTTLITTLIIIFAFPVLTVALALMTTDR 250
 
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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