>gnl|CDD|176216 cd08254, hydroxyacyl_CoA_DH, 6-hydroxycyclohex-1-ene-1-carboxyl-CoA dehydrogenase, N-benzyl-3-pyrrolidinol dehydrogenase, and other MDR family members. This group contains enzymes of the zinc-dependent alcohol dehydrogenase family, including members (aka MDR) identified as 6-hydroxycyclohex-1-ene-1-carboxyl-CoA dehydrogenase and N-benzyl-3-pyrrolidinol dehydrogenase. 6-hydroxycyclohex-1-ene-1-carboxyl-CoA dehydrogenase catalyzes the conversion of 6-Hydroxycyclohex-1-enecarbonyl-CoA and NAD+ to 6-Ketoxycyclohex-1-ene-1-carboxyl-CoA,NADH, and H+. This group displays the characteristic catalytic and structural zinc sites of the zinc-dependent alcohol dehydrogenases. 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 have 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. A GxGxxG motif after the first mononucleotide contact half allows the close contact of the coenzyme with the ADH backbone. 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. In human ADH catalysis, the zinc ion helps coordinate the alcohol, followed by deprotonation of a histidine, the ribose of NAD, a serine, then the alcohol, which allows the transfer of a hydride to NAD+, creating NADH and a zinc-bound aldehyde or ketone. In yeast and some bacteria, the active site zinc binds an aldehyde, polarizing it, and leading to the reverse reaction. Length = 338

 Score =  129 bits (327), Expect = 9e-31
 Identities = 87/353 (24%), Positives = 151/353 (42%), Gaps = 47/353 (13%)

Query: 12  MSGYGKSNV----MFLAESPIPQPQKEEILIKVEAIGVNRPDVMQRKGLYPPPKNANPIL 67
           M  +         + L E P+P+P   E+L+KV+A GV   D+    G  P        L
Sbjct: 1   MKAWRFHKGSKGLLVLEEVPVPEPGPGEVLVKVKAAGVCHSDLHILDGGVPTLTKLPLTL 60

Query: 68  GLEVAGKIVDLGENTTHWNIGDEV----------CALVNG-----------------GGY 100
           G E+AG +V++G   T++ +GD V          CAL                    GG+
Sbjct: 61  GHEIAGTVVEVGAGVTNFKVGDRVAVPAVIPCGACALCRRGRGNLCLNQGMPGLGIDGGF 120

Query: 101 AEYCLSHQGHTLPIPKGYNAIQAASLPESFFTVWANLFQTANLRSGQTVLIHGGSSGIGT 160
           AEY +      +P+P G    QAA   ++  T +  + +   ++ G+TVL+  G  G+G 
Sbjct: 121 AEYIVVPARALVPVPDGVPFAQAAVATDAVLTPYHAVVRAGEVKPGETVLV-IGLGGLGL 179

Query: 161 TAIQLASYFGATVYTTAKSEEKCLACLKLGAKHAINYLKEDFLEILQKETQGRGIDIILD 220
            A+Q+A   GA V      EEK     +LGA   +N L +   +       G G D+I D
Sbjct: 180 NAVQIAKAMGAAVIAVDIKEEKLELAKELGADEVLNSLDDSPKDKKAAG-LGGGFDVIFD 238

Query: 221 MVGA-EYLNQHLTLLSKEGKLIIISFLGGNIATEINLNPIISKRITITGSTLRRRTDIAK 279
            VG           +   G+++++    G     ++L+ +I++ + I GS          
Sbjct: 239 FVGTQPTFEDAQKAVKPGGRIVVVGL--GRDKLTVDLSDLIARELRIIGS-----FGGTP 291

Query: 280 QSIRDSLQLKIWPLLNSHVIAPVIHTVLPLGKVAMAHDIMEKSEHIGKIILLP 332
           + + + L      L+    + P + T  PL ++    + + K +  G+++L+P
Sbjct: 292 EDLPEVLD-----LIAKGKLDPQVETR-PLDEIPEVLERLHKGKVKGRVVLVP 338