RPSBLAST alignment for GI: 254780355 and conserved domain: cd06116
>gnl|CDD|99869 cd06116, CaCS_like, Chloroflexus aurantiacus (Ca) citrate synthase (CS)_like. CS catalyzes the condensation of acetyl coenzyme A (AcCoA) and oxalacetate (OAA) to form citrate and coenzyme A (CoA), the first step in the citric acid cycle (TCA or Krebs cycle). This group is similar to gram-negative Escherichia coli (Ec) CS (type II, gltA) and Arabidopsis thaliana (Ath) peroxisomal (Per) CS. However EcCS and AthPerCS are not found in this group. 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). Some type II CSs are strongly and specifically inhibited by NADH through an allosteric mechanism. C. aurantiacus is a gram-negative thermophilic green gliding bacterium, its CS belonging to this group may be a type I CS; it is not inhibited by NADH or 2-oxoglutarate and is inhibited by ATP. Both gram-positive and gram-negative bacteria are found in this group.. Length = 384
Score = 502 bits (1293), Expect = e-143
Identities = 215/388 (55%), Positives = 279/388 (71%), Gaps = 4/388 (1%)
Query: 38 GIFTYDPAFSSTASCKSKITFIDGNNGILLYRGYPIEQLSEKSDFLEVCYLLLHGELANV 97
G+ TYDPA+ +TASCKS IT+IDG GIL YRGYPIEQL+E+S +LEV YLLLHGEL
Sbjct: 1 GLMTYDPAYLNTASCKSAITYIDGEKGILRYRGYPIEQLAEQSSYLEVAYLLLHGELPTK 60
Query: 98 SQQKDFNDKISRHALLNENMSRFFMGFPSSAHPMAMLVSAVGALSSFYYSPSGVQDLEQC 157
+ + I+RH + +EN+ +F GF AHPM +L+S+V ALS+FY + D EQ
Sbjct: 61 ERLAQWVYDITRHTMTHENLKKFMDGFRYDAHPMGILISSVAALSTFYPEAKNIGDEEQR 120
Query: 158 VNVSLRMIAKISTIAAMIYKYSIGQPFVYPRSDLDYASNFLHMCFSVPCAEYQVNPLLAR 217
+R+I K+ TIAA Y++ +G P+V P +DL Y NFL M F + +Y+ NP+LA+
Sbjct: 121 NKQIIRLIGKMPTIAAFAYRHRLGLPYVLPDNDLSYTGNFLSMLFKMTEPKYEPNPVLAK 180
Query: 218 AMNRIFILHADHEQNASTSTVRLAGSSGADPFACIAAGVACLGGRAHGGANEEALNMLME 277
A++ +FILHADHEQN STS +R GSS ADP+ +AA VA L G HGGANE L ML +
Sbjct: 181 ALDVLFILHADHEQNCSTSAMRSVGSSRADPYTAVAAAVAALYGPLHGGANEAVLRMLQQ 240
Query: 278 IGSLERIPHYIMRAKDKNDPFRIMGFGHRVYRNHDPRCRIMRETMYEVLEVTGRFNDPIA 337
IGS + IP +I K + R+MGFGHRVY+N+DPR RI+++ EV E TGR +P+
Sbjct: 241 IGSPKNIPDFIETVKQGKE--RLMGFGHRVYKNYDPRARIIKKIADEVFEATGR--NPLL 296
Query: 338 QVAIELERIALEDEYFIERKLYPNVDFYSGITLRALGFPTNLFTVLFAVARTAGWVSQWT 397
+A+ELE+IALEDEYFI RKLYPNVDFYSG+ +ALGFPT FTVLFA+ RT+GW++QW
Sbjct: 297 DIAVELEKIALEDEYFISRKLYPNVDFYSGLIYQALGFPTEAFTVLFAIPRTSGWLAQWI 356
Query: 398 EMIVDPSRRIGRPRQLYTGALKRDYVPL 425
EM+ DP ++I RPRQ+YTG RDYVP+
Sbjct: 357 EMLRDPEQKIARPRQVYTGPRDRDYVPI 384