>gnl|CDD|176252 cd08292, ETR_like_2, 2-enoyl thioester reductase (ETR) like proteins, child 2. 2-enoyl thioester reductase (ETR) like proteins. 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 2-enoyl thioester reductase (ETR) like proteins. ETR catalyzes the NADPH-dependent 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 = 324

 Score = 90.1 bits (224), Expect = 8e-19
 Identities = 73/329 (22%), Positives = 135/329 (41%), Gaps = 11/329 (3%)

Query: 7   MRHVAMSGYGK-SNVMFLAESPIPQPQKEEILIKVEAIGVNRPDVMQRKGLYPPPKNANP 65
           MR    + +G  ++V+ + E P P P   E+L++     ++  D+   +G Y        
Sbjct: 1   MRAAVHTQFGDPADVLEIGEVPKPTPGAGEVLVRTTLSPIHNHDLWTIRGTYGYKPELPA 60

Query: 66  ILGLEVAGKIVDLGENTTHWNIGDEVCALVNGGGYAEYCLSHQGHTLPIPKGYN---AIQ 122
           I G E  G +  +GE      +G  V      G +AEY ++     +P+P G +   A Q
Sbjct: 61  IGGSEAVGVVDAVGEGVKGLQVGQRVAVAPVHGTWAEYFVAPADGLVPLPDGISDEVAAQ 120

Query: 123 AASLPESFFTVWANLFQTANLRSGQTVLIHGGSSGIGTTAIQLASYFGATVYTTAKSEEK 182
             ++P S       L     ++ GQ ++ +     +G     LA+  G  V    + +  
Sbjct: 121 LIAMPLSA----LMLLDFLGVKPGQWLIQNAAGGAVGKLVAMLAAARGINVINLVRRDAG 176

Query: 183 CLACLKLGAKHAINYLKEDFLEILQKETQGRGIDIILDMVGAEYLNQHLTLLSKEGKLII 242
                 LG    ++  +  + + +++   G  I + LD VG +   + L+LL + G L+ 
Sbjct: 177 VAELRALGIGPVVSTEQPGWQDKVREAAGGAPISVALDSVGGKLAGELLSLLGEGGTLVS 236

Query: 243 ISFLGGNIATEINLNPIISKRITITGSTLRRRTDIAKQSIRDSLQLKIWPL-LNSHVIAP 301
              + G    +I+   +I K+ T+ G    R +       R  +  ++  L L   ++ P
Sbjct: 237 FGSMSGEP-MQISSGDLIFKQATVRGFWGGRWSQEMSVEYRKRMIAELLTLALKGQLLLP 295

Query: 302 VIHTVLPLGKVAMAHDIMEKSEHIGKIIL 330
           V   V  LG  A A     +    GK++L
Sbjct: 296 V-EAVFDLGDAAKAAAASMRPGRAGKVLL 323