>TIGR01800 cit_synth_II 2-methylcitrate synthase/citrate synthase II; InterPro: IPR011278 Citrate synthase 2.3.3.1 from EC is a member of a small family of enzymes that can directly form a carbon-carbon bond without the presence of metal ion cofactors. It catalyses the first reaction in the Krebs' cycle, namely the conversion of oxaloacetate and acetyl-coenzyme A into citrate and coenzyme A. This reaction is important for energy generation and for carbon assimilation. The reaction proceeds via a non-covalently bound citryl-coenzyme A intermediate in a 2-step process (aldol-Claisen condensation followed by the hydrolysis of citryl-CoA). Citrate synthase enzymes are found in two distinct structural types: type I enzymes (found in eukaryotes, Gram-positive bacteria and archaea) form homodimers and have shorter sequences than type II enzymes, which are found in Gram-negative bacteria and are hexameric in structure. In both types, the monomer is composed of two domains: a large alpha-helical domain consisting of two structural repeats, where the second repeat is interrupted by a small alpha-helical domain. The cleft between these domains forms the active site, where both citrate and acetyl-coenzyme A bind. The enzyme undergoes a conformational change upon binding of the oxaloacetate ligand, whereby the active site cleft closes over in order to form the acetyl-CoA binding site . The energy required for domain closure comes from the interaction of the enzyme with the substrate. Type II enzymes possess an extra N-terminal beta-sheet domain, and some type II enzymes are allosterically inhibited by NADH . This entry represents type I homodimeric citrate synthase enzymes (predominantly from Gram-positive bacteria and archaea), as well as 2-methylcitrate synthase; some enzyme in this entry may be bifunctional citrate synthase/2-methylcitrate synthase enzymes. Members of this family appear as a second citrate synthase isozyme but typically are associated with propionate metabolism and synthesise 2-methylcitrate from propionyl-CoA; citrate synthase activity may be incidental. A number of species, including Thermoplasma acidophilum, Pyrococcus furiosus, and the Antarctic bacterium DS2-3R have a bifunctional member of this family as the only citrate synthase isozyme . 2-methylcitrate (2.3.3.5 from EC) synthase catalyses the conversion of oxaloacetate and propanoyl-CoA into (2R,3S)-2-hydroxybutane-1,2,3-tricarboxylate and coenzyme A. This enzyme is induced during bacterial growth on propionate, while type II hexameric citrate synthase is constitutive . ; GO: 0046912 transferase activity transferring acyl groups acyl groups converted into alkyl on transfer, 0044262 cellular carbohydrate metabolic process, 0005737 cytoplasm.

Probab=100.00 E-value=0 Score=1059.30 Aligned_cols=376 Identities=36% Similarity=0.620 Sum_probs=365.4 Q ss_pred CCCCEEEEEEEEEEEECCCCEEEECCEEHHHHHHHCC-HHHHHHHHHCCCCCCHHHHHHHHHHHHHCCCCCHHHHHHHHH Q ss_conf 8786238787565433447778989931999975089-899999998187999899999999886406899899999985 Q gi|254780355|r 45 AFSSTASCKSKITFIDGNNGILLYRGYPIEQLSEKSD-FLEVCYLLLHGELANVSQQKDFNDKISRHALLNENMSRFFMG 123 (429) Q Consensus 45 G~~~ta~ceS~IT~IDG~~G~L~YRGY~IedLa~~~s-FeEVayLLl~GeLPt~~el~~F~~~l~~~~~lpe~v~~~i~~ 123 (429) T Consensus 2 GLegV~~~~T~ls~i~~~~g~L~Y~GY~i~DLa~~a~qFEEv~YLLl~G~LPt~~EL~~fk~~l~~~R~lP~~vi~~~~~ 81 (386) T TIGR01800 2 GLEGVLADETSLSTIDGEEGILTYRGYDIEDLAEKASQFEEVAYLLLHGKLPTKEELEKFKTELAKLRGLPDEVIELLES 81 (386) T ss_pred CCCCCCCCCEEEEEEECCCCEEEECCCCHHHHHHHCCCHHHHHHHHHHHCCCCHHHHHHHHHHHHHHCCCCHHHHHHHHH T ss_conf 76774211100004627887025637658999962264189999998205988889999989999751898989999986 Q ss_pred HCC-CCCHHHHHHHHHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCC--HHHHHHHHHH Q ss_conf 124-7652578999999987520685576787889888999999999999999997279853488864--2468877876 Q gi|254780355|r 124 FPS-SAHPMAMLVSAVGALSSFYYSPSGVQDLEQCVNVSLRMIAKISTIAAMIYKYSIGQPFVYPRSD--LDYASNFLHM 200 (429) Q Consensus 124 ~p~-~ahPM~~L~~~vsaL~a~~~~~~~~~d~~~~~~~a~rLiA~~p~i~A~~yr~~~G~~~i~Pd~~--lsyaeNfL~M 200 (429) T Consensus 82 LP~~~~HPM~~LRTAvS~LG~~d~~G~~~~t~~~~r~~a~~l~A~~P~Iva~~~R~~~g~~~v~P~~~s~~s~A~nFL~m 161 (386) T TIGR01800 82 LPAEESHPMAVLRTAVSYLGALDPEGAETRTPEEARDIAKRLLAKLPTIVAAWYRIRNGLEIVAPREDSDLSIAANFLYM 161 (386) T ss_pred CCCCCCCHHHHHHHHHHHHHCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCHHHHHHHH T ss_conf 03025898999999999984358777767898889888788774444999999976436885688435565356778876 Q ss_pred HCCCCCCCCCCCHHHHHHHHHHHHEECCCCCCCHHHHHHHHHCCCCCHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHCCC Q ss_conf 42898410147969999987563501367876301555544205654246776755421002220352899999862155 Q gi|254780355|r 201 CFSVPCAEYQVNPLLARAMNRIFILHADHEQNASTSTVRLAGSSGADPFACIAAGVACLGGRAHGGANEEALNMLMEIGS 280 (429) Q Consensus 201 l~~~~~~~~~~~~~~~~ald~~LILhADHe~NaSTft~R~vaSt~adlysai~agi~aL~GPlHGGAne~v~~ml~~I~~ 280 (429) T Consensus 162 L~GeddGsv~P~~~~~~a~~~aLiLyAeHe~NASTFaarv~aSTLSD~YSaitaAIGALkGPLHGGAnE~vm~~l~ei~~ 241 (386) T TIGR01800 162 LHGEDDGSVEPSKEEEKAMDIALILYAEHELNASTFAARVIASTLSDIYSAITAAIGALKGPLHGGANEAVMKMLDEIGD 241 (386) T ss_pred HCCCCCCCCCCCHHHHHHHCCHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHHHHHHHCC T ss_conf 41787788788979998613001134223885667999999988888999999999970687503189999999975238 Q ss_pred C-CHHHHHHHHHHHC-CCCCEEECCCCCCCCCCCHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHHHHHHHHHCCCCCC Q ss_conf 3-5127999999821-4786143027743555540346899999998886087765179999999999961153145798 Q gi|254780355|r 281 L-ERIPHYIMRAKDK-NDPFRIMGFGHRVYRNHDPRCRIMRETMYEVLEVTGRFNDPIAQVAIELERIALEDEYFIERKL 358 (429) Q Consensus 281 ~-~~v~~~i~~~~~~-~~~~ri~GfGHrvyk~~DPRa~~l~~~~~~l~~~~~~~~~~~~~~a~~le~~a~~d~~~~~r~l 358 (429) T Consensus 242 pd~~aE~~~~~~l~~GKE--riMGFGHRVYk~~DPRa~~lk~~a~~L~~~~G~--~K~Yei~~~~E~~~~--~~~g~Kgl 315 (386) T TIGR01800 242 PDDKAEAWIRKKLENGKE--RIMGFGHRVYKTYDPRAKILKEYAKKLSAKKGE--SKWYEISERIEDVME--KALGEKGL 315 (386) T ss_pred HHHHHHHHHHHHHHHCCC--EEEECCCCCCCCCCCCHHHHHHHHHHHHHCCCC--CCHHHHHHHHHHHHH--HHHCCCCC T ss_conf 444588999999970896--684057532468996278999999999841688--723688899999999--97214788 Q ss_pred CCCCCHHHHHHHHHCCCCHH--HHHHHHHHHHHHHHHHHHHHHHH-CCCCCCCCCCCCCCCCCCCCCCCHHHC Q ss_conf 77844788999998499966--85899999999899999999970-789830045621058876870685542 Q gi|254780355|r 359 YPNVDFYSGITLRALGFPTN--LFTVLFAVARTAGWVSQWTEMIV-DPSRRIGRPRQLYTGALKRDYVPLEER 428 (429) Q Consensus 359 ~pNvDfysg~i~~~lGip~~--~ft~iFa~~R~~Gw~AH~~Eq~~-~~~~ri~RP~~~Y~G~~~r~y~pi~~R 428 (429) T Consensus 316 ~PNvDFySa~vY~~lGiP~~nnlFTpiFa~sRvsGW~AH~~Eq~~e~--NRLIRPrA~YvG~~~r~~vPi~~R 386 (386) T TIGR01800 316 YPNVDFYSASVYYSLGIPVDNNLFTPIFAMSRVSGWTAHIIEQYEEN--NRLIRPRAEYVGPEERKYVPIEER 386 (386) T ss_pred CCCCCHHHHHHHHHCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHC--CCCCCCCCCCCCCCCCCCCCCCCC T ss_conf 98886145899874688853344405899987777687545413205--631177522467566620670139

HHsearch alignment for GI: 254780355 and conserved domain: TIGR01800