>cd06101 citrate_synt Citrate synthase (CS) catalyzes the condensation of acetyl coenzyme A (AcCoA) and oxalacetate (OAA) to form citrate and coenzyme A (CoA), the first step in the oxidative citric acid cycle (TCA or Krebs cycle). Peroxisomal CS is involved in the glyoxylate cycle. This group also includes CS proteins which functions as a 2-methylcitrate synthase (2MCS). 2MCS catalyzes the condensation of propionyl-CoA (PrCoA) and OAA to form 2-methylcitrate and CoA during propionate metabolism. This group contains proteins which functions exclusively as either a CS or a 2MCS, as well as those with relaxed specificity which have dual functions as both a CS and a 2MCS. The overall CS reaction is thought to proceed through three partial reactions and involves both closed and open conformational forms of the enzyme: a) the carbanion or equivalent is generated from AcCoA by base abstraction of a proton, b) the nucleophilic attack of this carbanion on OAA to generate citryl-CoA, and c) the

Probab=100.00 E-value=0 Score=698.32 Aligned_cols=263 Identities=51% Similarity=0.825 Sum_probs=251.1 Q ss_pred CCCCCEEEEEEEEEEEECCCCEEEECCEEHHHHHHHCCHHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCHHHHHHHHH Q ss_conf 88786238787565433447778989931999975089899999998187999899999999886406899899999985 Q gi|254780355|r 44 PAFSSTASCKSKITFIDGNNGILLYRGYPIEQLSEKSDFLEVCYLLLHGELANVSQQKDFNDKISRHALLNENMSRFFMG 123 (429) Q Consensus 44 pG~~~ta~ceS~IT~IDG~~G~L~YRGY~IedLa~~~sFeEVayLLl~GeLPt~~el~~F~~~l~~~~~lpe~v~~~i~~ 123 (429) T Consensus 1 pGl~~~~~~~s~Is~idg~~g~L~yRGy~i~dLa~~~sfeeva~LL~~G~LP---------------------------- 52 (265) T cd06101 1 PGLRGVAALESEISVIDGDEGGLRYRGYPIEELAENSSFEEVAYLLLTGELP---------------------------- 52 (265) T ss_pred CCCCCCCEEEEECEEEECCCCEEEECCEEHHHHHHCCCHHHHHHHHHCCCCC---------------------------- T ss_conf 9988850566456277189998989995899987359999999999479899---------------------------- Q ss_pred HCCCCCHHHHHHHHHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCHHHHHHHHHHHCC Q ss_conf 12476525789999999875206855767878898889999999999999999972798534888642468877876428 Q gi|254780355|r 124 FPSSAHPMAMLVSAVGALSSFYYSPSGVQDLEQCVNVSLRMIAKISTIAAMIYKYSIGQPFVYPRSDLDYASNFLHMCFS 203 (429) Q Consensus 124 ~p~~ahPM~~L~~~vsaL~a~~~~~~~~~d~~~~~~~a~rLiA~~p~i~A~~yr~~~G~~~i~Pd~~lsyaeNfL~Ml~~ 203 (429) T Consensus 53 --------------------------------------------------------------------~~a~nfl~ml~g 64 (265) T cd06101 53 --------------------------------------------------------------------SYAENFLYMLGG 64 (265) T ss_pred --------------------------------------------------------------------CCHHHHHHHHCC T ss_conf --------------------------------------------------------------------828789998548 Q ss_pred CCCCCCCCCHHHHHHHHHHHHEECCCCCCCHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHCCCC-- Q ss_conf 984101479699999875635013678763015555442056542467767554210022203528999998621553-- Q gi|254780355|r 204 VPCAEYQVNPLLARAMNRIFILHADHEQNASTSTVRLAGSSGADPFACIAAGVACLGGRAHGGANEEALNMLMEIGSL-- 281 (429) Q Consensus 204 ~~~~~~~~~~~~~~ald~~LILhADHe~NaSTft~R~vaSt~adlysai~agi~aL~GPlHGGAne~v~~ml~~I~~~-- 281 (429) T Consensus 65 ~-----~p~~~~~~~ld~~Lil~aDH~~n~STfaaRvvaSt~adl~~avaagi~aL~GplHGGA~e~~~~~l~ei~~~~~ 139 (265) T cd06101 65 E-----EPDPEFAKAMDLALILHADHEGNASTFTARVVGSTLSDPYSAIAAAIAALKGPLHGGANEAVLKMLEEIGTPKN 139 (265) T ss_pred C-----CCCHHHHHHHHHHHHHHHCCCCCHHHHHHHHHHCCCCCHHHHHHHHHHHCCCCCCCCCHHHHHHHHHHHCCCCC T ss_conf 9-----99989999999999998315776048887877525987899998778756787777838999999998578654 Q ss_pred CHHHHHHHHHHHCCCCCEEECCCCCCCCCCCHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCC Q ss_conf 51279999998214786143027743555540346899999998886087765179999999999961153145798778 Q gi|254780355|r 282 ERIPHYIMRAKDKNDPFRIMGFGHRVYRNHDPRCRIMRETMYEVLEVTGRFNDPIAQVAIELERIALEDEYFIERKLYPN 361 (429) Q Consensus 282 ~~v~~~i~~~~~~~~~~ri~GfGHrvyk~~DPRa~~l~~~~~~l~~~~~~~~~~~~~~a~~le~~a~~d~~~~~r~l~pN 361 (429) T Consensus 140 ~~a~~~v~~~~~~~~--~i~GFGHrvYk~~DPRa~~L~~~~~~l~~~~~--~~~~~~~a~~~e~~~~~~~~~--k~l~pN 213 (265) T cd06101 140 EPAEAYIRKKLNSKR--VLMGFGHRVYKKYDPRATVLKKFAEKLLKEKG--LDPMFELAAELEKIAPEVLYE--KKLYPN 213 (265) T ss_pred CHHHHHHHHHHHCCC--CCCCCCCCCCCCCCCCHHHHHHHHHHHHHHCC--CCHHHHHHHHHHHHHHHHHCC--CCCCCC T ss_conf 379999998773488--64467887789999618999999999987518--636999999999998862222--688765 Q ss_pred CCHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCC Q ss_conf 44788999998499966858999999998999999999707898300456210 Q gi|254780355|r 362 VDFYSGITLRALGFPTNLFTVLFAVARTAGWVSQWTEMIVDPSRRIGRPRQLY 414 (429) Q Consensus 362 vDfysg~i~~~lGip~~~ft~iFa~~R~~Gw~AH~~Eq~~~~~~ri~RP~~~Y 414 (429) T Consensus 214 vD~~~a~l~~~lG~p~~~~t~iFaisR~~Gw~AH~~Eq~~~~-~ri~RP~~~Y 265 (265) T cd06101 214 VDFYSGVLYKAMGFPTELFTPLFAVSRAVGWLAHLIEQREDG-QRIIRPRAEY 265 (265) T ss_pred HHHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCC-CCCCCCCCCC T ss_conf 799999999990979436779999999999999999999779-9856886769

HHsearch alignment for GI: 254780355 and conserved domain: cd06101