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Conserved domains on  [gi|121762300|gb|ABM65077|]
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cytochrome oxidase subunit I, partial (mitochondrion) [Bulla punctulata]

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 ...
 2-196 1.61e-117

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: 343.00  E-value: 1.61e-117
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00153  21 GAWSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSF 100

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00153 101 WLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMP 180

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00153 181 LFVWSVLITAILLLLSLPVLAGAITMLLTDRNLNT 215
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 2-196 1.61e-117

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 343.00  E-value: 1.61e-117
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00153  21 GAWSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSF 100

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00153 101 WLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMP 180

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00153 181 LFVWSVLITAILLLLSLPVLAGAITMLLTDRNLNT 215
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 2-196 1.20e-111

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: 327.13  E-value: 1.20e-111
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:cd01663   14 GLWSGLVGTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSF 93

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:cd01663   94 WLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMP 173

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:cd01663  174 LFVWSVLITAFLLLLSLPVLAGAITMLLTDRNFNT 208
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
7-196 1.34e-58

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 191.88  E-value: 1.34e-58
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   7 LVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRMNNMSFWLLPP 86
Cdd:COG0843   31 LIGGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  87 SFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLSLFVWS 166
Cdd:COG0843  110 GGLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWA 189

                        170       180       190
                 ....*....|....*....|....*....|
gi 121762300 167 VFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:COG0843  190 ALVTSILILLAFPVLAAALLLLLLDRSLGT 219
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 2-196 7.23e-39

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: 137.70  E-value: 7.23e-39
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300    2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:pfam00115  10 ALVWFLVGGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSF 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   82 WLLPPSFILLLVSSmieGGAGTGWTVYPPLSGpiahgstsVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFeRLS 161
Cdd:pfam00115  89 WLVVLGAVLLLASF---GGATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMP 156

                         170       180       190
                  ....*....|....*....|....*....|....*
gi 121762300  162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:pfam00115 157 LFVWAILATAILILLAFPVLAAALLLLLLDRSLGA 191
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 13-196 4.13e-31

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: 118.80  E-value: 4.13e-31
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   13 SLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRMNNMSFWLLPPSFILLL 92
Cdd:TIGR02882  72 ALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGAMLFN 150

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   93 VSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLSLFVWSVFVTAF 172
Cdd:TIGR02882 151 ISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTLITTL 230

                         170       180
                  ....*....|....*....|....
gi 121762300  173 LLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:TIGR02882 231 IIIFAFPVLTVALALMTTDRIFDT 254
 
Name Accession Description Interval E-value
COX1 MTH00153
cytochrome c oxidase subunit I; Provisional
 2-196 1.61e-117

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177210  Cd Length: 511  Bit Score: 343.00  E-value: 1.61e-117
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00153  21 GAWSGMVGTSLSLLIRAELGQPGSLIGDDQIYNVIVTAHAFIMIFFMVMPIMIGGFGNWLVPLMLGAPDMAFPRMNNMSF 100

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00153 101 WLLPPSLTLLLSSSMVESGAGTGWTVYPPLSSNIAHSGASVDLAIFSLHLAGISSILGAINFITTIINMRSKGMTLDRMP 180

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00153 181 LFVWSVLITAILLLLSLPVLAGAITMLLTDRNLNT 215
COX1 MTH00223
cytochrome c oxidase subunit I; Provisional
 2-196 1.10e-116

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177260  Cd Length: 512  Bit Score: 340.80  E-value: 1.10e-116
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00223  20 GMWSGLVGTSLSLLIRAELGQPGALLGDDQLYNVIVTAHAFVMIFFLVMPMMIGGFGNWLVPLMLGAPDMAFPRLNNMSF 99

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00223 100 WLLPPSLYLLLSSSAVESGVGTGWTVYPPLSSNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTIINMRSPGMQLERLP 179

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00223 180 LFVWSVKVTAFLLLLSLPVLAGAITMLLTDRNFNT 214
Cyt_c_Oxidase_I cd01663
Cytochrome C oxidase subunit I. Cytochrome c oxidase (CcO), the terminal oxidase in the ...
 2-196 1.20e-111

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: 327.13  E-value: 1.20e-111
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:cd01663   14 GLWSGLVGTSLSLLIRLELSQPGSQLGNDQLYNVIVTAHALIMIFFMVMPALIGGFGNWLVPLMIGAPDMAFPRLNNLSF 93

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:cd01663   94 WLLPPSLLLLLLSALVEGGAGTGWTVYPPLSSILAHSGPSVDLAIFSLHLAGISSILGAINFITTIFNMRAPGMTLEKMP 173

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:cd01663  174 LFVWSVLITAFLLLLSLPVLAGAITMLLTDRNFNT 208
COX1 MTH00167
cytochrome c oxidase subunit I; Provisional
 2-196 1.04e-103

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177222  Cd Length: 512  Bit Score: 307.76  E-value: 1.04e-103
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00167  23 GAWAGMVGTALSLLIRAELSQPGSLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMSF 102

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00167 103 WLLPPSLLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGSINFITTIINMKPPGITQYQTP 182

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00167 183 LFVWSILVTTILLLLSLPVLAAAITMLLTDRNLNT 217
COX1 MTH00142
cytochrome c oxidase subunit I; Provisional
 1-196 1.01e-101

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214431  Cd Length: 511  Bit Score: 302.41  E-value: 1.01e-101
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00142  20 FGAWAGMVGTGLSLLIRAELGQPGSLLGDDQLYNVIVTAHAFVMIFFMVMPVMIGGFGNWLVPLMLGAPDMAFPRMNNMS 99

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00142 100 FWLLPPALLLLLSSAAVESGAGTGWTVYPPLSSNLAHSGGSVDLAIFSLHLAGVSSILGAINFITTVINMRAGGMKFERV 179

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00142 180 PLFVWSVKITAILLLLSLPVLAGAITMLLTDRNFNT 215
COX1 MTH00116
cytochrome c oxidase subunit I; Provisional
 1-196 4.62e-100

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177177  Cd Length: 515  Bit Score: 298.54  E-value: 4.62e-100
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00116  22 FGAWAGMVGTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMS 101

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00116 102 FWLLPPSFLLLLASSTVEAGAGTGWTVYPPLAGNLAHAGASVDLAIFSLHLAGVSSILGAINFITTCINMKPPAMSQYQT 181

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00116 182 PLFVWSVLITAVLLLLSLPVLAAGITMLLTDRNLNT 217
COX1 MTH00037
cytochrome c oxidase subunit I; Provisional
 1-196 3.04e-93

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177112  Cd Length: 517  Bit Score: 280.95  E-value: 3.04e-93
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00037  22 FGAWAGMVGTAMSVIIRTELAQPGSLLQDDQIYNVIVTAHALVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMS 101

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00037 102 FWLIPPSFLLLLASAGVESGAGTGWTIYPPLSSNIAHAGGSVDLAIFSLHLAGASSILASINFITTIINMRTPGMTFDRL 181

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00037 182 PLFVWSVFITAFLLLLSLPVLAGAITMLLTDRNINT 217
COX1 MTH00103
cytochrome c oxidase subunit I; Validated
 1-196 2.31e-91

cytochrome c oxidase subunit I; Validated


Pssm-ID: 177165  Cd Length: 513  Bit Score: 275.99  E-value: 2.31e-91
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00103  22 FGAWAGMVGTALSLLIRAELGQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMS 101

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00103 102 FWLLPPSFLLLLASSMVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAMSQYQT 181

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00103 182 PLFVWSVLITAVLLLLSLPVLAAGITMLLTDRNLNT 217
COX1 MTH00183
cytochrome c oxidase subunit I; Provisional
 1-196 2.32e-90

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177234  Cd Length: 516  Bit Score: 273.72  E-value: 2.32e-90
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00183  22 FGAWAGMVGTALSLLIRAELSQPGALLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLIPLMIGAPDMAFPRMNNMS 101

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00183 102 FWLLPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTIINMKPPAISQYQT 181

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00183 182 PLFVWAVLITAVLLLLSLPVLAAGITMLLTDRNLNT 217
COX1 MTH00077
cytochrome c oxidase subunit I; Provisional
 1-196 2.55e-89

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214419  Cd Length: 514  Bit Score: 271.04  E-value: 2.55e-89
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00077  22 FGAWAGMVGTALSLLIRAELSQPGTLLGDDQIYNVIVTAHAFVMIFFMVMPIMIGGFGNWLVPLMIGAPDMAFPRMNNMS 101

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00077 102 FWLLPPSFLLLLASSGVEAGAGTGWTVYPPLAGNLAHAGASVDLTIFSLHLAGVSSILGAINFITTSINMKPPSMSQYQT 181

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00077 182 PLFVWSVLITAVLLLLSLPVLAAGITMLLTDRNLNT 217
COX1 MTH00182
cytochrome c oxidase subunit I; Provisional
 1-196 6.85e-89

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 214451  Cd Length: 525  Bit Score: 270.15  E-value: 6.85e-89
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00182  24 FGAGAGMIGTAFSMLIRLELSAPGAMLGDDHLYNVIVTAHAFIMIFFLVMPVMIGGFGNWLVPLYIGAPDMAFPRLNNIS 103

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00182 104 FWLLPPALILLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGAVDMAIFSLHLAGVSSILGAINFITTIFNMRAPGVTFNRL 183

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00182 184 PLFVWSILITAFLLLLSLPVLAGAITMLLTDRNFNT 219
COX1 MTH00007
cytochrome c oxidase subunit I; Validated
 2-196 8.45e-88

cytochrome c oxidase subunit I; Validated


Pssm-ID: 133649  Cd Length: 511  Bit Score: 267.15  E-value: 8.45e-88
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00007  20 GVWGGLLGTSMSLLIRIELGQPGAFLGSDQLYNTIVTAHAFLMIFFLVMPVFIGGFGNWLVPLMLGAPDMAFPRLNNMSF 99

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00007 100 WLLPPALILLVSSAAVEKGVGTGWTVYPPLASNLAHAGPSVDLAIFSLHLAGVSSILGAINFITTVINMRWKGLRLERIP 179

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00007 180 LFVWAVVITVVLLLLSLPVLAGAITMLLTDRNLNT 214
COX1 MTH00184
cytochrome c oxidase subunit I; Provisional
 1-196 3.44e-87

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177235  Cd Length: 519  Bit Score: 265.54  E-value: 3.44e-87
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00184  24 FGAFAGMIGTAFSMLIRLELSAPGSMLGDDHLYNVIVTAHAFVMIFFLVMPVMIGGFGNWFVPLYIGAPDMAFPRLNNIS 103

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00184 104 FWLLPPALTLLLGSAFVEQGAGTGWTVYPPLSSIQAHSGGSVDMAIFSLHLAGISSILGAMNFITTIFNMRAPGITMDRM 183

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00184 184 PLFVWSILVTTFLLLLSLPVLAGAITMLLTDRNFNT 219
COX1 MTH00079
cytochrome c oxidase subunit I; Provisional
 2-196 8.36e-84

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177148  Cd Length: 508  Bit Score: 256.53  E-value: 8.36e-84
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00079  24 GLWSGMVGTSLSLIIRLELSKPGLLLGNGQLYNSVITAHAILMIFFMVMPSMIGGFGNWMLPLMLGAPDMSFPRLNNLSF 103

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGpIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLS 161
Cdd:MTH00079 104 WLLPTSLFLILDSCFVDMGPGTSWTVYPPLST-LGHPGSSVDLAIFSLHCAGISSILGGINFMVTTKNLRSSSISLEHMS 182

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00079 183 LFVWTVFVTVFLLVLSLPVLAGAITMLLTDRNLNT 217
COX1 MTH00026
cytochrome c oxidase subunit I; Provisional
 1-196 2.95e-77

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 164599  Cd Length: 534  Bit Score: 240.30  E-value: 2.95e-77
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMS 80
Cdd:MTH00026  23 FGALSGAIGTAFSMLIRLELSSPGSMLGDDHLYNVIVTAHAFVMIFFLVMPTMIGGFGNWFVPLMIGAPDMAFPRLNNIS 102

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:MTH00026 103 FWLLPPALFLLLGSSLVEQGAGTGWTVYPPLASIQAHSGGSVDMAIFSLHLAGLSSILGAMNFITTVMNMRTPGMTMSRI 182

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00026 183 PLFVWSVFITAILLLLSLPVLAGAITMLLTDRNFNT 218
Heme_Cu_Oxidase_I cd00919
Heme-copper oxidase subunit I. Heme-copper oxidases are transmembrane protein complexes in ...
 1-196 8.48e-69

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: 216.63  E-value: 8.48e-69
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   1 WGLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLlIGAPDMSFPRMNNMS 80
Cdd:cd00919   11 FAFVALLLGGLLALLIRLELATPGSLFLDPQLYNQLVTAHGVIMIFFFVMPAIFGGFGNLLPPL-IGARDLAFPRLNNLS 89

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  81 FWLLPPSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERL 160
Cdd:cd00919   90 FWLFPPGLLLLLSSVLVGGGAGTGWTFYPPLSTLSYSSGVGVDLAILGLHLAGVSSILGAINFITTILNMRAPGMTLDKM 169

                        170       180       190
                 ....*....|....*....|....*....|....*.
gi 121762300 161 SLFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:cd00919  170 PLFVWSVLVTAILLLLALPVLAAALVMLLLDRNFGT 205
CyoB COG0843
Heme/copper-type cytochrome/quinol oxidase, subunit 1 [Energy production and conversion];
7-196 1.34e-58

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


Pssm-ID: 440605  Cd Length: 535  Bit Score: 191.88  E-value: 1.34e-58
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   7 LVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRMNNMSFWLLPP 86
Cdd:COG0843   31 LIGGLLALLMRLQLAGPGLGLLSPETYNQLFTMHGTIMIFFFATP-FLAGFGNYLVPLQIGARDMAFPRLNALSFWLYLF 109

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  87 SFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLSLFVWS 166
Cdd:COG0843  110 GGLLLLISLFVGGAADVGWTFYPPLSGLEASPGVGVDLWLLGLALFGVGSILGGVNFIVTILKMRAPGMTLMRMPLFTWA 189

                        170       180       190
                 ....*....|....*....|....*....|
gi 121762300 167 VFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:COG0843  190 ALVTSILILLAFPVLAAALLLLLLDRSLGT 219
COX1 MTH00048
cytochrome c oxidase subunit I; Provisional
 2-196 4.33e-51

cytochrome c oxidase subunit I; Provisional


Pssm-ID: 177123  Cd Length: 511  Bit Score: 171.78  E-value: 4.33e-51
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:MTH00048  24 GVWSGFVGLSLSLLIRLNFLDPYYNVISLDVYNFLITNHGIIMIFFFLMPVLIGGFGNYLLPLLLGLSDLNLPRLNALSA 103

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  82 WLLPPSFILLLVSsmIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGItFERLS 161
Cdd:MTH00048 104 WLLVPSIVFLLLS--MCLGAGVGWTFYPPLSSSLFSSSWGVDFLMFSLHLAGVSSLFGSINFICTIYSAFMTNV-FSRTS 180

                        170       180       190
                 ....*....|....*....|....*....|....*
gi 121762300 162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:MTH00048 181 IILWSYLFTSILLLLSLPVLAAAITMLLFDRNFGS 215
Ubiquinol_Oxidase_I cd01662
Ubiquinol oxidase subunit I. Ubiquinol oxidase, the terminal oxidase in the respiratory ...
 7-196 4.24e-44

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: 152.74  E-value: 4.24e-44
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   7 LVGTGLSLLIRFELGTASA-FLGDDHfYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRMNNMSFWLLP 85
Cdd:cd01662   23 LRGGVDALLMRTQLALPGNdFLSPEH-YNQIFTMHGTIMIFLFAMPLVFG-LMNYLVPLQIGARDVAFPRLNALSFWLFL 100

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  86 PSFILLLVSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLSLFVW 165
Cdd:cd01662  101 FGGLLLNASLLIGGFPDAGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPIFTW 180

                        170       180       190
                 ....*....|....*....|....*....|.
gi 121762300 166 SVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:cd01662  181 TTLVTSILILFAFPVLTAALALLELDRYFGT 211
COX1 pfam00115
Cytochrome C and Quinol oxidase polypeptide I; Cytochrome c oxidase (E.C:7.1.1.9) is a key ...
 2-196 7.23e-39

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: 137.70  E-value: 7.23e-39
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300    2 GLWCGLVGTGLSLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPlMIGGFGNWMVPLLIGAPDMSFPRMNNMSF 81
Cdd:pfam00115  10 ALVWFLVGGLLGLLIRLQLAFPGLNFLSPLTYNQLRTLHGNLMIFWFATP-FLFGFGNYLVPLMIGARDMAFPRLNALSF 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   82 WLLPPSFILLLVSSmieGGAGTGWTVYPPLSGpiahgstsVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFeRLS 161
Cdd:pfam00115  89 WLVVLGAVLLLASF---GGATTGWTEYPPLVG--------VDLWYIGLLLAGVSSLLGAINFIVTILKRRAPGMTL-RMP 156

                         170       180       190
                  ....*....|....*....|....*....|....*
gi 121762300  162 LFVWSVFVTAFLLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:pfam00115 157 LFVWAILATAILILLAFPVLAAALLLLLLDRSLGA 191
QoxB TIGR02882
cytochrome aa3 quinol oxidase, subunit I; This family (QoxB) encodes subunit I of the aa3-type ...
 13-196 4.13e-31

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: 118.80  E-value: 4.13e-31
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   13 SLLIRFELGTASAFLGDDHFYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRMNNMSFWLLPPSFILLL 92
Cdd:TIGR02882  72 ALLMRAQLTVPDNKFLDAQHYNEIFTTHGVIMIIFMAMPFIIG-LMNIVVPLQIGARDVAFPVLNALSFWLFFAGAMLFN 150

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300   93 VSSMIEGGAGTGWTVYPPLSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLSLFVWSVFVTAF 172
Cdd:TIGR02882 151 ISFVIGGSPDAGWTNYAPLAGPEFSPGVGVNYYLIALQISGIGTLMTGINFFVTILKMRAPGMKLMQMPMFTWTTLITTL 230

                         170       180
                  ....*....|....*....|....
gi 121762300  173 LLLLSLPVLAGAITMLLTDRNFNT 196
Cdd:TIGR02882 231 IIIFAFPVLTVALALMTTDRIFDT 254
PRK15017 PRK15017
cytochrome o ubiquinol oxidase subunit I; Provisional
 31-196 4.13e-30

cytochrome o ubiquinol oxidase subunit I; Provisional


Pssm-ID: 184978  Cd Length: 663  Bit Score: 115.80  E-value: 4.13e-30
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300  31 HFYNVIVTAHAFVMIFFMVMPLMIGgFGNWMVPLLIGAPDMSFPRMNNMSFWLLPPSFILLLVSSMIEGGAGTGWTVYPP 110
Cdd:PRK15017  97 HHYDQIFTAHGVIMIFFVAMPFVIG-LMNLVVPLQIGARDVAFPFLNNLSFWFTVVGVILVNVSLGVGEFAQTGWLAYPP 175

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 121762300 111 LSGPIAHGSTSVDLVIFSLHLAGMSSILGAINFITTIINMRSPGITFERLSLFVWSVFVTAFLLLLSLPVLAGAITMLLT 190
Cdd:PRK15017 176 LSGIEYSPGVGVDYWIWSLQLSGIGTTLTGINFFVTILKMRAPGMTMFKMPVFTWASLCANVLIIASFPILTVTVALLTL 255


                 ....*.
gi 121762300 191 DRNFNT 196
Cdd:PRK15017 256 DRYLGT 261
 
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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