RPSBLAST alignment for GI: 254780290 and conserved domain: cd08290

>gnl|CDD|176250 cd08290, ETR, 2-enoyl thioester reductase (ETR). 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 = 341
 Score = 79.2 bits (196), Expect = 2e-15
 Identities = 75/315 (23%), Positives = 125/315 (39%), Gaps = 26/315 (8%)

Query: 13  SGYGK-SNVMFLAESPIPQPQ-KEEILIKVEAIGVNRPDVMQRKGLYP--PPKNANP--I 66
           + +G+   V+ L    IP P    E+L+K+ A  +N  D+ Q +G+YP  PP    P  +
Sbjct: 7   TEHGEPKEVLQLESYEIPPPGPPNEVLVKMLAAPINPADINQIQGVYPIKPPTTPEPPAV 66

Query: 67  LGLEVAGKIVDLGENTTHWNIGDEVCALVNGGG-YAEYCLSHQGHTLPIPKGYNAIQAAS 125
            G E  G++V +G        GD V  L  G G +  + +      + +P   +  QAA+
Sbjct: 67  GGNEGVGEVVKVGSGVKSLKPGDWVIPLRPGLGTWRTHAVVPADDLIKVPNDVDPEQAAT 126

Query: 126 LPESFFTVWANLFQTANLRSGQTVLIHGGSSGIGTTAIQLASYFGATV---------YTT 176
           L  +  T +  L     L+ G  V+ +G +S +G   IQLA   G               
Sbjct: 127 LSVNPCTAYRLLEDFVKLQPGDWVIQNGANSAVGQAVIQLAKLLGIKTINVVRDRPDLEE 186

Query: 177 AKSEEKCLACLKLGAKHAINY---LKEDFLEILQKETQGRGIDIILDMVGAEYLNQHLTL 233
            K   K      LGA H +           E+L K   G    + L+ VG +   +   L
Sbjct: 187 LKERLK-----ALGADHVLTEEELRSLLATELL-KSAPGGRPKLALNCVGGKSATELARL 240

Query: 234 LSKEGKLIIISFLGGNIATEINLNPIISKRITITGSTLRRRTDIAKQSIRDSLQLKIWPL 293
           LS  G ++    + G     +  + +I K IT+ G  L R    A    ++ +  ++  L
Sbjct: 241 LSPGGTMVTYGGMSGQ-PVTVPTSLLIFKDITLRGFWLTRWLKRANPEEKEDMLEELAEL 299

Query: 294 LNSHVIAPVIHTVLP 308
           +    +       + 
Sbjct: 300 IREGKLKAPPVEKVT 314