>gnl|CDD|176251 cd08291, ETR_like_1, 2-enoyl thioester reductase (ETR) like proteins, child 1. 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 = 94.6 bits (236), Expect = 4e-20
 Identities = 77/270 (28%), Positives = 117/270 (43%), Gaps = 12/270 (4%)

Query: 7   MRHVAMSGYGKSNVMF---LAESPIPQPQKEEILIKVEAIGVNRPDVMQRKGLYPPPKNA 63
           M+ + +  YGK   +    L E  +P+P   E+LIKVEA  +N  D+   KG Y   K  
Sbjct: 1   MKALLLEEYGKPLEVKELSLPEPEVPEPGPGEVLIKVEAAPINPSDLGFLKGQYGSTKAL 60

Query: 64  NPILGLEVAGKIVDLGENTTHWN-IGDEVCALVNGGG-YAEYCLSHQGHTLPIPKGYNAI 121
               G E +G +V  G      + IG  V  L    G YAEY ++     LP+P G +  
Sbjct: 61  PVPPGFEGSGTVVAAGGGPLAQSLIGKRVAFLAGSYGTYAEYAVADAQQCLPLPDGVSFE 120

Query: 122 QAASLPESF---FTVWANLFQTANLRSGQTVLIHGGSSGIGTTAIQLASYFGATVYTTAK 178
           Q AS   SF    T    + +TA     + V+    +S +G   ++L    G  V    +
Sbjct: 121 QGAS---SFVNPLTALG-MLETAREEGAKAVVHTAAASALGRMLVRLCKADGIKVINIVR 176

Query: 179 SEEKCLACLKLGAKHAINYLKEDFLEILQKETQGRGIDIILDMVGAEYLNQHLTLLSKEG 238
            +E+     K+GA++ +N    DFLE L++        I  D VG     Q L  +    
Sbjct: 177 RKEQVDLLKKIGAEYVLNSSDPDFLEDLKELIAKLNATIFFDAVGGGLTGQILLAMPYGS 236

Query: 239 KLIIISFLGGNIATEINLNPIISKRITITG 268
            L +  +L G +   I+   +I K  +I G
Sbjct: 237 TLYVYGYLSGKLDEPIDPVDLIFKNKSIEG 266