>TIGR02485 CobZ_N-term precorrin 3B synthase CobZ; InterPro: IPR012831 Cobalamin (vitamin B12) is a structurally complex cofactor, consisting of a modified tetrapyrrole with a centrally chelated cobalt. Cobalamin is usually found in one of two biologically active forms: methylcobalamin and adocobalamin. Most prokaryotes, as well as animals, have cobalamin-dependent enzymes, whereas plants and fungi do not appear to use it. In bacteria and archaea, these include methionine synthase, ribonucleotide reductase, glutamate and methylmalonyl-CoA mutases, ethanolamine ammonia lyase, and diol dehydratase . In mammals, cobalamin is obtained through the diet, and is required for methionine synthase and methylmalonyl-CoA mutase . There are at least two distinct cobalamin biosynthetic pathways in bacteria : Aerobic pathway that requires oxygen and in which cobalt is inserted late in the pathway ; found in Pseudomonas denitrificans and Rhodobacter capsulatus. Anaerobic pathway in which cobalt insertion is the first committed step towards cobalamin synthesis ; found in Salmonella typhimurium, Bacillus megaterium, and Propionibacterium freudenreichii shermanii. Either pathway can be divided into two parts: (1) corrin ring synthesis (differs in aerobic and anaerobic pathways) and (2) adenosylation of corrin ring, attachment of aminopropanol arm, and assembly of the nucleotide loop (common to both pathways) . There are about 30 enzymes involved in either pathway, where those involved in the aerobic pathway are prefixed Cob and those of the anaerobic pathway Cbi. Several of these enzymes are pathway-specific: CbiD, CbiG, and CbiK are specific to the anaerobic route of S. typhimurium, whereas CobE, CobF, CobG, CobN, CobS, CobT, and CobW are unique to the aerobic pathway of P. denitrificans. This entry represents CobZ, which is essential for cobalamin biosynthesis and is complemented by precorrin 3B synthase CobG (1.3.99.1 from EC). The enzyme has been shown to contain flavin, haem and Fe-S cluster cofactors, and is believed to require dioxygen as a substrate. In Rhodobacter capsulatus, CobZ is found as a N-terminal domain, whereas in other species it exists as a separate protein. The C-terminal portion is homologous to the 2-component signal transduction system protein CitB (IPR012830 from INTERPRO)..

Probab=98.69 E-value=5e-08 Score=74.70 Aligned_cols=276 Identities=18% Similarity=0.143 Sum_probs=144.8 Q ss_pred CCEEEECCCHHHHHHHHHHHHCCCCCEEEEEECCCCCCCCCCCCCEECHHHHH---H----HCCC-------HHHHCCCC Q ss_conf 47799989768999999999808997399997867789864027403336788---8----6787-------26414885 Q gi|254781024|r 15 YDVVIIGAGPAGLAAAIRCKQINPHLSVVILEKSAEVGAHILSGAIIDPIGID---S----LLPR-------WREDKGHP 80 (554) Q Consensus 15 yDVvIVGaGPAG~saA~~La~~g~~l~VlvlEK~~~pG~~i~sG~vl~p~aL~---e----L~Pd-------~~e~~g~p 80 (554) T Consensus 2 V~VLvIGgG~AgLCAAi~ArraG--AsVllLeaAPr~~---rGGNarHgRN~R~~hd~p~d~~~D~YpaEEf~~dL--~~ 74 (467) T TIGR02485 2 VDVLVIGGGLAGLCAAIEARRAG--ASVLLLEAAPRDL---RGGNARHGRNLRVAHDIPLDFLRDAYPAEEFRRDL--LK 74 (467) T ss_pred CEEEEECCCHHHHHHHHHHHHCC--CEEEEECCCCCCC---CCCCCCCCCCCEEECCCCCCCCCCCCCHHHHHHHH--HH T ss_conf 23788764258899999986379--6798402478532---57865333451110157888645787378999875--43 Q ss_pred CCCEEEEEEEE-EECCCC----------CEECCCCCCCCCCCCCCCEEEEHH---------HHHHHHHHHHHHCCCEECC Q ss_conf 43224366999-977997----------677365435654467882688888---------9899999999874953306 Q gi|254781024|r 81 FHTVVKRDLYW-FLNAQR----------SIQIPHFCLPDFMDNKEHYIVSLG---------QVCRWLKNKAEALGVEIYC 140 (554) Q Consensus 81 l~~~v~~d~~~-~l~~~~----------~~~~p~~~~p~~~~~~g~yiv~r~---------~fd~~L~~~Ae~~Gvei~~ 140 (554) T Consensus 75 vtgg~t~~~l~~L~i~r~s~~~~w~~~~GVhl~----P~~---aG~lpysRrtaF~~GGGkAl~NAly~sAerLGv~Iry 147 (467) T TIGR02485 75 VTGGRTDERLARLLIERASSILRWLIAHGVHLQ----PAA---AGVLPYSRRTAFLLGGGKALVNALYASAERLGVEIRY 147 (467) T ss_pred HCCCCCCHHHHHHHHHHCCHHHHHHHHCCCEEC----CCC---CCCCCHHHCCCCCCCCHHHHHHHHHHHHHHCCEEEEC T ss_conf 127874115789988720023689996794336----632---5657601111123576189999999988555725414 Q ss_pred CCEEEEEEECC-CCCEEEEEECCCCCCCCCCCCCCCCCEEEEEEEEEEEECCCCCHHHHHHHHHCCCCCCC--CHHHH-- Q ss_conf 82243477627-76201454124324434665787563026774257860664432554211224899888--89899-- Q gi|254781024|r 141 GFTATEIYYGK-KGEALGILTGEKGKNYDGTQGKHYIAPMLLLSKYMLVGEGACGSLTRQLIERYSLMDGR--QPQKF-- 215 (554) Q Consensus 141 g~~v~~i~~~e-~g~vvgv~t~~~G~~k~~~~~~~~~~g~~i~Ak~vI~AdG~~s~lak~l~~~~~l~~~~--~p~~~-- 215 (554) T Consensus 148 ~~~V~ri~~~~~g~~~i~~~~v~~~-------------~~rI~t~a~VlaaGG~ganr~WLr~~~G~~a~geWPadn~~~ 214 (467) T TIGR02485 148 DAEVERIEREEDGRAFIAARLVAAA-------------DERIATKAVVLAAGGLGANREWLRKAFGSRAEGEWPADNFLV 214 (467) T ss_pred CCCCCCCCCCCCCCCCCCCEEEECC-------------CCCEEEEEEEEEECCCCCCHHHHHHHCCCCCCCCCCHHCEEE T ss_conf 7730002645678620121466226-------------881224688886178888979999836887577885110012 Q ss_pred -----HHHHHHHHHHC-CCCC---CCCEEEEEECCCCCCCCCCCEEEEECCCCEEEEEEEECCCCCCCCCCHHHHHHHHH Q ss_conf -----88988887516-5667---88808995043476876641257664798059999832666566889889999986 Q gi|254781024|r 216 -----GLGIKELWKIK-PQYH---RRGLALHSIGWPLDMNTSGGGFVYHFDDNLVSIGFVLHLDYRNPWISAYEELQRFK 286 (554) Q Consensus 216 -----~~gvke~~ei~-~~~~---~~G~~~h~~g~~~~~~~~gggwiy~~~d~~~~iG~v~~ld~~~~~~~~~~~lq~fk 286 (554) T Consensus 215 RGTpy~~G~LL~~ll~d~Ga~aiGdPt-~~HvVavDaR-aP~~DgGIvtRid~-~~lG~VV~r~G~R-----------f~ 280 (467) T TIGR02485 215 RGTPYAKGRLLKLLLDDEGADAIGDPT-DAHVVAVDAR-APLYDGGIVTRIDS-VSLGVVVDRDGER-----------FA 280 (467) T ss_pred CCCCHHCCHHHHHHHHHCCCCCCCCCC-CCCEEEECCC-CCCCCCCEEEEECE-EECCEEECCCCCC-----------HH T ss_conf 588021026899998541643037798-7306765688-88457835744121-2113178897761-----------24 Q ss_pred HCCCHHHHHCCCCEECCCCEECCCCCCCCCCCCCCCCEEEEC-CCCCCCCCCCCCCH Q ss_conf 080045650388263035134005421248742308879961-23233136643522 Q gi|254781024|r 287 THPDIRIIFTEGERLEYGARVISEGGWQSVPKLSFPGGSLIG-CAAGFVNLLRIKGS 342 (554) Q Consensus 287 ~hp~i~~~l~gg~~~~yga~~ip~gg~~s~pk~~~~g~lLvG-DAAG~vnP~~g~GI 342 (554) T Consensus 281 de----Ga~~~P~rya~Wgr~~a~-----~P--gq~ay~lld~~a~~r~~P~a~pp~ 326 (467) T TIGR02485 281 DE----GADSQPKRYAVWGRRVAD-----RP--GQLAYLLLDAKALKRLAPSALPPV 326 (467) T ss_pred HC----CCCCCCCEEECHHHHHHC-----CC--CCEEEEEECCHHHHHCCCCCCCCC T ss_conf 13----667788413001367635-----89--851532432057863587456978

HHsearch alignment for GI: 254781024 and conserved domain: TIGR02485