RPSBLAST alignment for GI: 254780355 and conserved domain: cd06105

>gnl|CDD|99858 cd06105, ScCit1-2_like, Saccharomyces cerevisiae (Sc) citrate synthases Cit1-2_like. Citrate synthases (CS) catalyzes the condensation of acetyl coenzyme A (AcCoA) with oxaloacetate (OAA) to form citrate and coenzyme A (CoA), the first step in the citric acid cycle (TCA or Krebs cycle). Some CS proteins function as 2-methylcitrate synthase (2MCS). 2MCS catalyzes the condensation of propionyl-coenzyme A (PrCoA) and OAA to form 2-methylcitrate and CoA during propionate metabolism. 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 hydrolysis of citryl-CoA to produce citrate and CoA. There are two types of CSs: type I CS and type II CSs. Type I CSs are found in eukarya, gram-positive bacteria, archaea, and in some gram-negative bacteria and are homodimers with both subunits participating in the active site. Type II CSs are unique to gram-negative bacteria and are homohexamers of identical subunits (approximated as a trimer of dimers). ScCit1 is a nuclear-encoded mitochondrial CS with highly specificity for AcCoA. In addition to its CS function, ScCit1 plays a part in the construction of the TCA cycle metabolon. Yeast cells deleted for Cit1 are hyper-susceptible to apoptosis induced by heat and aging stress. ScCit2 is a peroxisomal CS involved in the glyoxylate cycle; in addition to having activity with AcCoA, it may have activity with PrCoA. Chicken and pig heart CS, two Arabidopsis thaliana (Ath) CSs, CSY4 and -5, and Aspergillus niger (An) CS also belong to this group. Ath CSY4 has a mitochondrial targeting sequence; AthCSY5 has no identifiable targeting sequence. AnCS encoded by the citA gene has both an N-terminal mitochondrial import signal and a C-terminal peroxisiomal target sequence; it is not known if both these signals are functional in vivo. 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.. Length = 427
 Score =  138 bits (350), Expect = 2e-33
 Identities = 119/394 (30%), Positives = 186/394 (47%), Gaps = 54/394 (13%)

Query: 59  IDGNNGILLYRGYPIEQLSE---KSDFLE------VCYLLLHGELANVSQQKDFNDKISR 109
           +D   GI  +RG  I +  +   K+   E      + +LLL GE+    Q    + + + 
Sbjct: 53  LDPEEGIR-FRGLSIPECQKLLPKAPGGEEPLPEGLFWLLLTGEVPTKEQVSALSKEWAA 111

Query: 110 HALLNENMSRFFMGFPSSAHPMAMLVSAVGAL---SSFY--YSPSGVQD---LEQCVNVS 161
            A L  ++      FP++ HPM+ L +A+ AL   S F   Y+  G+      E     S
Sbjct: 112 RAALPSHVVTMLDNFPTNLHPMSQLSAAITALNSESKFAKAYA-EGIHKSKYWEYVYEDS 170

Query: 162 LRMIAKISTIAAMIYK--YSIGQPFVYPRSDLDYASNFLHMC-FSVPCAEYQVNPLLARA 218
           + +IAK+  +AA IY+  Y  G+  +   S+LD+++NF +M  ++        +P     
Sbjct: 171 MDLIAKLPCVAAKIYRNLYRGGK-IIAIDSNLDWSANFANMLGYT--------DPQFTEL 221

Query: 219 MNRIFILHADHEQ-NASTSTVRLAGSSGADPFACIAAGVACLGGRAHGGANEEALNMLM- 276
           M     +H+DHE  N S  T  L GS+ +DP+   AA +  L G  HG AN+E L  L  
Sbjct: 222 MRLYLTIHSDHEGGNVSAHTTHLVGSALSDPYLSFAAAMNGLAGPLHGLANQEVLVWLTK 281

Query: 277 ---EIG---SLERIPHYIMRAKDKNDPFRIMGFGHRVYRNHDPRCRIMRETMYEVLEVTG 330
              E+G   S E++  Y+   K  N    + G+GH V R  DPR    RE   + L    
Sbjct: 282 LQKEVGKDVSDEQLREYVW--KTLNSGRVVPGYGHAVLRKTDPRYTCQREFALKHLP--- 336

Query: 331 RFNDPIAQVAIELERIALE--DEYFIERKLYPNVDFYSGITLRALGFP-TNLFTVLFAVA 387
             NDP+ ++  +L +I      E    +  +PNVD +SG+ L+  G    N +TVLF V+
Sbjct: 337 --NDPLFKLVSQLYKIVPPVLTEQGKAKNPWPNVDAHSGVLLQYYGLTEMNYYTVLFGVS 394

Query: 388 RTAGWVSQ--WTEMIVDPSRRIGRPRQLYTGALK 419
           R  G +SQ  W   +  P   + RP+ + T  L+
Sbjct: 395 RALGVLSQLIWDRALGLP---LERPKSVSTDGLE 425