>gnl|CDD|99859 cd06106, ScCit3_like, Saccharomyces cerevisiae (Sc) 2-methylcitrate synthase Cit3-like. 2-methylcitrate synthase (2MCS) catalyzes the condensation of propionyl-coenzyme A (PrCoA) and oxaloacetate (OAA) to form 2-methylcitrate and CoA. Citrate synthase (CS) catalyzes the condensation of acetyl coenzyme A (AcCoA) with OAA to form citrate and 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). ScCit3 is mitochondrial and functions in the metabolism of PrCoA; it is a dual specificity CS and 2MCS, having similar catalytic efficiency with both AcCoA and PrCoA. The pattern of expression of the ScCIT3 gene follows that of the major mitochondrial CS gene (CIT1, not included in this group) and its expression is increased in the presence of a CIT1 deletion. This group also contains Aspergillus nidulans 2MCS; a deletion of the gene encoding this protein results in a strain unable to grow on propionate. 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 = 428

 Score =  119 bits (300), Expect = 1e-27
 Identities = 104/363 (28%), Positives = 160/363 (44%), Gaps = 54/363 (14%)

Query: 87  YLLLHGELANVSQQKDFNDKISRHALLNENMSRFFMGFPSSAHPMAMLVSAVGAL---SS 143
           +LLL G++    Q +  + +++    L   + +     P + HPM  L   V AL   S 
Sbjct: 89  WLLLTGKVPTFEQARGLSKELAERGKLPHYIEKLLDSLPKTLHPMTQLSIGVAALNHDSK 148

Query: 144 F------------YYSPSGVQDLEQCVNVSLRMIAKISTIAAMIYK--YSIGQPFVYPRS 189
           F            Y+ P+    LE  +N    +IA++  +AA IY+  Y  G        
Sbjct: 149 FAAAYEKGIKKTEYWEPT----LEDSLN----LIARLPALAARIYRNVYGEGHGLGKIDP 200

Query: 190 DLDYASNFLHMCFSVPCAEYQVNPLLARAMNRIFILHADHEQ-NASTSTVRLAGSSGADP 248
           ++D++ NF  M        Y  N      +     LH DHE  N S  T  L GS+ +DP
Sbjct: 201 EVDWSYNFTSML------GYGDNLDFVDLLRLYIALHGDHEGGNVSAHTTHLVGSALSDP 254

Query: 249 FACIAAGVACLGGRAHGGANEEALNMLME----IGSL---ERIPHYIMRAKDKNDPFRIM 301
           +   +AG+  L G  HG A +E L  ++E    IGS    + I  Y+ +        R++
Sbjct: 255 YLSYSAGLMGLAGPLHGLAAQEVLRWILEMQKNIGSKATDQDIRDYLWKTLKSG---RVV 311

Query: 302 -GFGHRVYRNHDPRCRIMRETMYEVLEVTGRFNDPIAQVAIELERIA--LEDEYFIERKL 358
            G+GH V R  DPR   + E      E+    NDP+ Q+  +L  IA  +  E+   +  
Sbjct: 312 PGYGHAVLRKPDPRFTALMEFAQTRPELE---NDPVVQLVQKLSEIAPGVLTEHGKTKNP 368

Query: 359 YPNVDFYSGITLRALGFPTNLF-TVLFAVARTAGWVSQ--WTEMIVDPSRRIGRPRQLYT 415
           +PNVD  SG+     G    L+ TV+F V+R  G ++Q  W  ++  P   I RP+ L  
Sbjct: 369 FPNVDAASGVLFYHYGIREFLYYTVIFGVSRALGPLTQLVWDRILGLP---IERPKSLSL 425

Query: 416 GAL 418
             L
Sbjct: 426 EGL 428