>gnl|CDD|99867 cd06114, EcCS_like, Escherichia coli (Ec) citrate synthase (CS) GltA_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). 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 including EcCS are strongly and specifically inhibited by NADH through an allosteric mechanism. Included in this group is an NADH-insensitive type II Acetobacter acetii CS which has retained many of the residues used by EcCS for NADH binding.. Length = 400

Score = 693 bits (1791), Expect = 0.0 Identities = 251/401 (62%), Positives = 312/401 (77%), Gaps = 2/401 (0%) Query: 17 LPIKEGSLGSSVLDISFLHKN-GIFTYDPAFSSTASCKSKITFIDGNNGILLYRGYPIEQ 75 LP+ EG+ G V+DIS L K G+FTYDP F +TASC+S IT+IDG GIL YRGYPIEQ Sbjct: 1 LPVLEGTEGEKVIDISSLRKKTGVFTYDPGFMNTASCESAITYIDGEKGILRYRGYPIEQ 60 Query: 76 LSEKSDFLEVCYLLLHGELANVSQQKDFNDKISRHALLNENMSRFFMGFPSSAHPMAMLV 135 L+EKS FLEVCYLLL+GEL Q ++F ++I+RH L++E M RFF GFP AHPMA+L Sbjct: 61 LAEKSSFLEVCYLLLYGELPTAEQLQEFREEITRHTLVHEQMKRFFNGFPRDAHPMAILS 120 Query: 136 SAVGALSSFYYSPSGVQDLEQCVNVSLRMIAKISTIAAMIYKYSIGQPFVYPRSDLDYAS 195 + V ALS+FY V D EQ ++R+IAK+ TIAAM Y+YSIGQPF+YP +DL Y Sbjct: 121 AMVNALSAFYPDSLDVNDPEQRELAAIRLIAKVPTIAAMAYRYSIGQPFIYPDNDLSYVE 180 Query: 196 NFLHMCFSVPCAEYQVNPLLARAMNRIFILHADHEQNASTSTVRLAGSSGADPFACIAAG 255 NFLHM F+VP Y+V+P++ +A++ I ILHADHEQNASTSTVR+ GSSGA+ FA I+AG Sbjct: 181 NFLHMMFAVPYEPYEVDPVVVKALDTILILHADHEQNASTSTVRMVGSSGANLFASISAG 240 Query: 256 VACLGGRAHGGANEEALNMLMEIGSLERIPHYIMRAKDKNDPFRIMGFGHRVYRNHDPRC 315 +A L G HGGANE L ML EIGS+ + YI +AKDKNDPFR+MGFGHRVY+N+DPR Sbjct: 241 IAALWGPLHGGANEAVLEMLEEIGSVGNVDKYIAKAKDKNDPFRLMGFGHRVYKNYDPRA 300 Query: 316 RIMRETMYEVLEVTGRFNDPIAQVAIELERIALEDEYFIERKLYPNVDFYSGITLRALGF 375 +I+++T EVL G+ +DP+ ++A+ELE IAL+D+YFIERKLYPNVDFYSGI LRALG Sbjct: 301 KILKKTCDEVLAELGK-DDPLLEIAMELEEIALKDDYFIERKLYPNVDFYSGIILRALGI 359 Query: 376 PTNLFTVLFAVARTAGWVSQWTEMIVDPSRRIGRPRQLYTG 416 PT +FTVLFA+ RT GW++QW EM DP +IGRPRQLYTG Sbjct: 360 PTEMFTVLFALGRTPGWIAQWREMHEDPELKIGRPRQLYTG 400

RPSBLAST alignment for GI: 254780355 and conserved domain: cd06114