>cd01661 cbb3_Oxidase_I Cytochrome cbb3 oxidase subunit I. Cytochrome cbb3 oxidase, the terminal oxidase in the respiratory chains of proteobacteria, is a multi-chain transmembrane protein located in the cell membrane. Like other cytochrome oxidases, it catalyzes the reduction of O2 and simultaneously pumps protons across the membrane. Found mainly in proteobacteria, cbb3 is believed to be a modern enzyme that has evolved independently to perform a specialized function in microaerobic energy metabolism. 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 to the binuclear center. The cbb3 operon contains four genes (ccoNOQP or fixNOQP), with ccoN coding for subunit I. Instead of a CuA-containing subunit II analogous to other cytochrome oxidases, cbb3 utilizes subunits ccoO and ccoP, which contain one and two

Probab=100.00 E-value=0 Score=651.07 Aligned_cols=435 Identities=17% Similarity=0.237 Sum_probs=392.9 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCC Q ss_conf 79999999999999999999999999985076756677668789899999999999999999999999999999864986 Q gi|254780473|r 65 KKIGIMYIILSLVMLFRGFADAIMMRLQQAIASGGGEGYLDAHHYDQIFTAHGVIMIFFVAMPMITGIMNFVVPLQIGAR 144 (671) Q Consensus 65 K~IGi~Yiv~a~~~ll~Gg~~allmR~qla~p~~~~~~~l~~~~Ynq~~T~HG~~Mif~~a~p~~~G~~n~lvPl~iGar 144 (671) T Consensus 44 ~~~v~~f~i~s~~w~~vG~l~gl~~a~~L~~P~~~~--~~~~ltfgrlr~~Htn~~ifgw~~~a~~g~a~ylvPr~~~t~ 121 (493) T cd01661 44 DGPVFVGVIATMFWGLVGSLVGLIAALQLAEPDLLF--DLAWLSFGRLRPLHTNAVIFGFGGNALIATSFYVVQRTCRAR 121 (493) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCC--CCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC T ss_conf 276999999999999999999999999992876445--785415321268788999999999999999999999995982 Q ss_pred CHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf 40058899999999999999999999717677888313478655877885204588779999999998755689999997 Q gi|254780473|r 145 DVSFPFLNNFSFWMTVAGAVVIMCSLFIGEFASVGWLAYPPLSGISYSPGVGVDYYIWGLQIAGIGTTLSGINLVVTIIK 224 (671) Q Consensus 145 dlaFPrlna~sfWl~~~g~~l~~~S~~~g~~~~~GWt~YpPLs~~~~spg~g~d~~i~gl~l~gigsll~~iNfi~TI~~ 224 (671) T Consensus 122 -l~~~~L~~~~fw~~~~g~~l~~~~~~~G~-t~g~Ey~E~p--------------w~idi~i~-v~~~~~~~~~~~Ti~~ 184 (493) T cd01661 122 -LAGGNLAWFVFWGYNLFIVLAATGYLLGI-TQGKEYAEPE--------------WYVDLWLT-VVWVAYLLPFLGTLLR 184 (493) T ss_pred -CCCCHHHHHHHHHHHHHHHHHHHHHHCCC-CCCCCHHCCH--------------HHHHHHHH-HHHHHHHHHHHHHHHH T ss_conf -68752899999999999999999997358-7996520252--------------99999999-9999999999999997 Q ss_pred HCCCCCCHHHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCEECCCCCCCCHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf 23689883133156668999999999973335788899877763298011465432101322123334012579999879 Q gi|254780473|r 225 MRCPGMTMMKMPVFVWTAFCSNIMIIAAFPILTATLFLLTLDRYIGTNFFTNHLGGNPMMYINLIWIWGHPEVYILVLPA 304 (671) Q Consensus 225 ~RapGm~l~rmPlf~W~~l~tsil~i~a~PvL~~al~ll~lDr~~g~~FF~~~~GGdplL~q~LFW~fGHPeVYIliLPa 304 (671) T Consensus 185 rr~~~i-----yvs~W~~la~----li~~~~l~~~~~l~~~~~~~~~~~~~~~~Gv~~a~~~---WwfgH~~V~~~ltp~ 252 (493) T cd01661 185 RKEPHI-----YVANWYYLAF----IVTVAVLHIVNNLAVPVSWFGSKSYSAHAGVQDATTQ---WWYGHNAVGFFLTAG 252 (493) T ss_pred CCCCCE-----EHHHHHHHHH----HHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHHHHH---HHHHCHHHHHHHHHH T ss_conf 169960-----3369999999----9999999999887887887312313535342766888---765142899999999 Q ss_pred -HHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC Q ss_conf -9999999853105640266899999999999975332210224787588998765334678898779999878742587 Q gi|254780473|r 305 -FGIFSEVVATFSGKRLFGYNSMVYATLAITILSYTVWLHHFFTMGSGANVNAFFGIMTMVIAVPTGAKIFNWLFTMRLG 383 (671) Q Consensus 305 -~Gi~seiip~fs~kplfgy~~~v~A~~~i~~lsf~VW~HHmFt~G~~~~~~~~F~i~Tm~IaIPTgvkiFnwl~Tl~~G 383 (671) T Consensus 253 ~lgi~yy~lPk~~~rPi~sy~l~vi~fwal~~~~~~~g~HH~~~~~~P~w~~~~~~v~S~l~~vP~~~~~~N~~~Tl~g~ 332 (493) T cd01661 253 FLAMMYYFLPKIAERPVYSYRLSIIGFWALAFLYIWAGPHHLHYTALPDWLQTLGMVFSVMLWMPSWAGMINGLLTLRGA 332 (493) T ss_pred HHHHHHHHHHHHHCCCEEEEHHHHHHHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 99999999999819862543299999999999999875627305780789999999999999998999999999999842 Q ss_pred --CCEECHHHHHHHHHHHHHHHHHHHHHHCCCCCCCEEECCCEEHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCC-CCH Q ss_conf --30224379999999999998875565303432111212742204478999999999999999999624430767-471 Q gi|254780473|r 384 --KVRFEVPMMWTLGFMITFLIGGMTGVLLAVPPADFTLHNSLFLVAHFHNTIIGGVVFGLFAGIVYWFPKAFGYQ-LNS 460 (671) Q Consensus 384 --~ir~~~pml~~lgfi~~F~iGG~tGv~lA~~~~D~~lHnT~fVVAHFHyvl~gg~vf~~fagiyyW~Pk~~Gr~-l~e 460 (671) T Consensus 333 w~~~~~~~~l~f~~~~~~~y~~~g~~G~~~a~~~vn~~~H~T~~vvaH~H~~~~G~~~~~~fg~iYy~~Prl~gr~~~s~ 412 (493) T cd01661 333 WDKLRTDPTLRFMVVGGAFYGLSTFEGSFMAIRAVNSLSHYTDWTVGHVHLGALGWVGFITFGAIYFLVPRIWKREWPSP 412 (493) T ss_pred HCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCEEEHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCHHH T ss_conf 12556668999999999999999763897511556678236541188999999999999999999999999839963028 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHHHH-HHCCCHHHCCCCC-C---------HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf 6899999999999999999999987-6405303002587-0---------057999999999999999999999999999 Q gi|254780473|r 461 FWGKVSFWCWFVGFYLAFMPLYALG-LKGVTRRLSQYED-T---------TLQVYYVVALLGAVLIGIGVFSFVLSFIVS 529 (671) Q Consensus 461 ~lgk~~Fwl~~iGf~l~F~pm~~lG-l~GmpRR~~~y~~-~---------~~~~~n~istiGa~l~~~g~l~f~~nl~~S 529 (671) T Consensus 413 ~L~~~hFWl~~iG~~~~~~~m~~aGi~QG~~~r~~~~~g~~~~~f~~~v~~~~p~~~~R~~gG~l~~~G~l~f~yN~~~t 492 (493) T cd01661 413 KLVEWHFWLATIGIVIYFVAMWISGILQGLMWRDYDSDGFLVYSFIESVQATHPYYIARSVGGLLMLSGALVMAYNFWMT 492 (493) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHC T ss_conf 99999999999999999999999999976887402657664688999999873299999999999999999999999840 Q ss_pred H Q ss_conf 7 Q gi|254780473|r 530 F 530 (671) Q Consensus 530 ~ 530 (671) T Consensus 493 i 493 (493) T cd01661 493 I 493 (493) T ss_pred C T ss_conf 9

HHsearch alignment for GI: 254780473 and conserved domain: cd01661