>gnl|CDD|176645 cd05282, ETR_like, 2-enoyl thioester reductase-like. 2-enoyl thioester reductase (ETR) catalyzes the NADPH-dependent conversion of trans-2-enoyl acyl carrier protein/coenzyme A (ACP/CoA) to acyl-(ACP/CoA) in fatty acid synthesis. 2-enoyl thioester reductase activity has been linked in Candida tropicalis as essential in maintaining mitiochondrial respiratory function. This ETR family is a part of the medium chain dehydrogenase/reductase family, but lack the zinc coordination sites characteristic of the alcohol dehydrogenases in this family. NAD(P)(H)-dependent oxidoreductases are the major enzymes in the interconversion of alcohols and aldehydes, or ketones. Alcohol dehydrogenase in the liver converts ethanol and NAD+ to acetaldehyde and NADH, while in yeast and some other microorganisms ADH catalyzes the conversion acetaldehyde to ethanol in alcoholic fermentation. ADH is a member of the medium chain alcohol dehydrogenase family (MDR), which has a NAD(P)(H)-binding domain in a Rossmann fold of a beta-alpha form. The NAD(H)-binding region is comprised of 2 structurally similar halves, each of which contacts a mononucleotide. The N-terminal catalytic domain has a distant homology to GroES. These proteins typically form dimers (typically higher plants, mammals) or tetramers (yeast, bacteria), and have 2 tightly bound zinc atoms per subunit, a catalytic zinc at the active site and a structural zinc in a lobe of the catalytic domain. NAD(H) binding occurs in the cleft between the catalytic and coenzyme-binding domains at the active site, and coenzyme binding induces a conformational closing of this cleft. Coenzyme binding typically precedes and contributes to substrate binding. Candida tropicalis enoyl thioester reductase (Etr1p) catalyzes the NADPH-dependent reduction of trans-2-enoyl thioesters in mitochondrial fatty acid synthesis. Etr1p forms homodimers with each subunit containing a nucleotide-binding Rossmann fold domain and a catalytic domain. Length = 323

 Score =  116 bits (292), Expect = 1e-26
 Identities = 86/318 (27%), Positives = 137/318 (43%), Gaps = 15/318 (4%)

Query: 20  VMFLAESPIPQPQKEEILIKVEAIGVNRPDVMQRKGLYP--PPKNANPILGLEVAGKIVD 77
           V+ L   PIP P   E+L+++ A  +N  D++   G Y   PP  A  + G E  G +V+
Sbjct: 13  VLELVSLPIPPPGPGEVLVRMLAAPINPSDLITISGAYGSRPPLPA--VPGNEGVGVVVE 70

Query: 78  LGENTTHWNIGDEVCALVNGGGYAEYCLSHQGHTLPIPKGYNAIQAASL---PESFFTVW 134
           +G   +   +G  V  L   G + EY ++     +P+P   +  QAA L   P    T W
Sbjct: 71  VGSGVSGLLVGQRVLPLGGEGTWQEYVVAPADDLIPVPDSISDEQAAMLYINP---LTAW 127

Query: 135 ANLFQTANLRSGQTVLIHGGSSGIGTTAIQLASYFGA-TVYTTAKSEEKCLACLK-LGAK 192
             L +   L  G  V+ +  +S +G   IQLA   G  T+       ++ +  LK LGA 
Sbjct: 128 LMLTEYLKLPPGDWVIQNAANSAVGRMLIQLAKLLGFKTINVV--RRDEQVEELKALGAD 185

Query: 193 HAINYLKEDFLEILQKETQGRGIDIILDMVGAEYLNQHLTLLSKEGKLIIISFLGGNIAT 252
             I+   ED  + +++ T G G  + LD VG E   +    L   G L+    L G    
Sbjct: 186 EVIDSSPEDLAQRVKEATGGAGARLALDAVGGESATRLARSLRPGGTLVNYGLLSGEPVP 245

Query: 253 EINLNPIISKRITITGSTLRRRTDIAKQSIRDSLQLKIWPLLNSHVIAPVIHTVLPLGKV 312
               +  I K IT+ G  LR+    A +  +     ++  L+ + V+   +    PL   
Sbjct: 246 -FPRSVFIFKDITVRGFWLRQWLHSATKEAKQETFAEVIKLVEAGVLTTPVGAKFPLEDF 304

Query: 313 AMAHDIMEKSEHIGKIIL 330
             A    E+    GK++L
Sbjct: 305 EEAVAAAEQPGRGGKVLL 322