>gnl|CDD|99866 cd06113, citrate_synt_like_1_2, 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) a carbanion or equivalent is generated from AcCoA by base abstraction of a proton, b) nucleophilic attack of this carbanion on OAA to generate citryl-CoA, and c) hydrolysis of citryl-CoA to produce citrate and CoA. CSs are found in two structural types: type I (homodimeric) and type II CSs (homohexameric). Type II CSs are unique to gram-negative bacteria. Type I CSs are found in eukarya, gram-positive bacteria, archaea, and in some gram-negative bacteria. Type I CS is active as a homodimer, both subunits participating in the active site. Type II CS is a hexamer of identical subunits (approximated as a trimer of dimers). Some type II CSs are strongly and specifically inhibited by NADH through an allosteric mechanism. This subgroup includes both gram-positive and gram-negative bacteria.. Length = 406

 Score =  180 bits (459), Expect = 6e-46
 Identities = 120/376 (31%), Positives = 183/376 (48%), Gaps = 40/376 (10%)

Query: 64  GILLYRGYPIEQL---SEKSD---FLEVCYLLLHGELANVSQQKDFNDKISRHALLNENM 117
           G L YRGY +E L   ++K +   F E  YLLL G L N  + ++F + +S +  L +N 
Sbjct: 36  GKLYYRGYDVEDLVNGAQKENRFGFEETAYLLLFGYLPNKEELEEFCEILSSYRTLPDNF 95

Query: 118 SR-FFMGFPSSAHPMAMLVSAVGALSSFYYSPSGVQDLEQCVNVSLRMIAKISTIAAMIY 176
                +  PS    M  L  +V AL S+   P  +  LE  +  S+++IA++ TIA   Y
Sbjct: 96  VEDVILKAPSK-DIMNKLQRSVLALYSYDDKPDDI-SLENVLRQSIQLIARLPTIAVYAY 153

Query: 177 K----YSIGQPFV--YPRSDLDYASNFLHMCFSVPCAEYQVNPLLARAMNRIFILHADHE 230
           +    Y  G+     +P+ +L  A N L M    P  +Y    L A+ ++   +LHA+H 
Sbjct: 154 QAKRHYYDGESLYIHHPQPELSTAENILSML--RPDKKY--TELEAKLLDLCLVLHAEHG 209

Query: 231 Q-NASTSTVRLAGSSGADPFACIAAGVACLGGRAHGGANEEALNMLMEI----------G 279
             N ST T R+  SSG D ++ IAA +  L G  HGGAN + + ML +I           
Sbjct: 210 GGNNSTFTTRVVSSSGTDTYSAIAAAIGSLKGPRHGGANIKVMEMLEDIKENVKDWTDED 269

Query: 280 SLERIPHYIMRAKDKNDPFRIMGFGHRVYRNHDPRCRIMRETMYEVLEVTGR-----FND 334
            +      I+  +  +    I G GH VY   DPR  ++++    + +  GR       +
Sbjct: 270 EVRAYLRKILNKEAFDKSGLIYGMGHAVYTLSDPRAVVLKKYARSLAKEKGREEEFALYE 329

Query: 335 PIAQVAIELERIALEDEYFIERKLYPNVDFYSGITLRALGFPTNLFTVLFAVARTAGWVS 394
            I ++A E+    + +E  I + +  NVDFYSG   + LG P  L+T LFAVAR  GW +
Sbjct: 330 RIERLAPEV----IAEERGIGKTVCANVDFYSGFVYKMLGIPQELYTPLFAVARIVGWCA 385

Query: 395 QWTEMIVDPSRRIGRP 410
              E +++   RI RP
Sbjct: 386 HRIEELLNSG-RIIRP 400