RPSBLAST alignment for GI: 254780473 and conserved domain: cd01662

>gnl|CDD|29933 cd01662, Ubiquinol_Oxidase_I, 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.. Length = 501
 Score =  709 bits (1831), Expect = 0.0
 Identities = 303/506 (59%), Positives = 375/506 (74%), Gaps = 6/506 (1%)

Query: 58  WFTSVDHKKIGIMYIILSLVMLFRGFADAIMMRLQQAIASGGGEGYLDAHHYDQIFTAHG 117
           W T+VDHK+IGIMYII + V   RG  DA++MR Q A+       +L   HY+QIFT HG
Sbjct: 1   WLTTVDHKRIGIMYIITAFVFFLRGGVDALLMRTQLALPGND---FLSPEHYNQIFTMHG 57

Query: 118 VIMIFFVAMPMITGIMNFVVPLQIGARDVSFPFLNNFSFWMTVAGAVVIMCSLFIGEFAS 177
            IMIF  AMP++ G+MN++VPLQIGARDV+FP LN  SFW+ + G +++  SL IG F  
Sbjct: 58  TIMIFLFAMPLVFGLMNYLVPLQIGARDVAFPRLNALSFWLFLFGGLLLNASLLIGGFPD 117

Query: 178 VGWLAYPPLSGISYSPGVGVDYYIWGLQIAGIGTTLSGINLVVTIIKMRCPGMTMMKMPV 237
            GW AYPPLSG+ YSPGVGVDY+I GLQ +GIGT L  IN +VTI+KMR PGMT+M+MP+
Sbjct: 118 AGWFAYPPLSGLEYSPGVGVDYWILGLQFSGIGTLLGAINFIVTILKMRAPGMTLMRMPI 177

Query: 238 FVWTAFCSNIMIIAAFPILTATLFLLTLDRYIGTNFFTNHLGGNPMMYINLIWIWGHPEV 297
           F WT   ++I+I+ AFP+LTA L LL LDRY GT+FFTN LGGNPM++ +L WI+GHPEV
Sbjct: 178 FTWTTLVTSILILFAFPVLTAALALLELDRYFGTHFFTNALGGNPMLWQHLFWIFGHPEV 237

Query: 298 YILVLPAFGIFSEVVATFSGKRLFGYNSMVYATLAITILSYTVWLHHFFTMGSGANVNAF 357
           YIL+LPAFGIFSE+V TFS K LFGY SMVYAT+AI  LS+ VW+HH FT G+GA VNAF
Sbjct: 238 YILILPAFGIFSEIVPTFSRKPLFGYRSMVYATVAIGFLSFGVWVHHMFTTGAGALVNAF 297

Query: 358 FGIMTMVIAVPTGAKIFNWLFTMRLGKVRFEVPMMWTLGFMITFLIGGMTGVLLAVPPAD 417
           F I TM+IAVPTG KIFNWLFTM  G++RFE PM+W +GF++TF+IGG+TGV+LA PPAD
Sbjct: 298 FSIATMIIAVPTGVKIFNWLFTMWRGRIRFETPMLWAIGFLVTFVIGGLTGVMLASPPAD 357

Query: 418 FTLHNSLFLVAHFHNTIIGGVVFGLFAGIVYWFPKAFGYQLNSFWGKVSFWCWFVGFYLA 477
           F +H++ F+VAHFH  +IGGVVF LFAG  YWFPK FG  LN   GK SFW WF+GF L 
Sbjct: 358 FQVHDTYFVVAHFHYVLIGGVVFPLFAGFYYWFPKMFGRMLNERLGKWSFWLWFIGFNLT 417

Query: 478 FMPLYALGLKGVTRRLSQYE-DTTLQVYYVVALLGAVLIGIGVFSFVLSFIVSFLNRSKL 536
           F P++ LGL G+ RR+  Y          +++ +GA LI  GV  F+++ IVS     + 
Sbjct: 418 FFPMHILGLMGMPRRVYTYLPGPGWDPLNLISTIGAFLIAAGVLLFLINVIVSIRKGKR- 476

Query: 537 QDTIGDPWDGRTLEWSISSPSPQYNF 562
            D  GDPW  RTLEW+ SSP P YNF
Sbjct: 477 -DATGDPWGARTLEWATSSPPPAYNF 501