>gnl|CDD|176224 cd08263, Zn_ADH10, Alcohol dehydrogenases of the MDR 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 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 = 367

 Score =  127 bits (320), Expect = 5e-30
 Identities = 90/328 (27%), Positives = 151/328 (46%), Gaps = 60/328 (18%)

Query: 7   MRHVAMSGYGKSNVMFLAESPIPQPQKEEILIKVEAIGVNRPDVMQRKGLYPPPKNANPI 66
           M+   + G      + + E P+P+P++ EILI+V A GV   D+   KG  P P     +
Sbjct: 1   MKAAVLKGPNPP--LTIEEIPVPRPKEGEILIRVAACGVCHSDLHVLKGELPFPPPF--V 56

Query: 67  LGLEVAGKIVDLGENTTHWN---IGDEV-------------CA----------------- 93
           LG E++G++V++G N  +     +GD V             CA                 
Sbjct: 57  LGHEISGEVVEVGPNVENPYGLSVGDRVVGSFIMPCGKCRYCARGKENLCEDFFAYNRLK 116

Query: 94  --LVNG-----------------GGYAEYCLSHQGHTLPIPKGYNAIQAASLPESFFTVW 134
             L +G                 GG AEY +       P+P+  +  ++A L  + FT +
Sbjct: 117 GTLYDGTTRLFRLDGGPVYMYSMGGLAEYAVVPATALAPLPESLDYTESAVLGCAGFTAY 176

Query: 135 ANLFQTANLRSGQTVLIHGGSSGIGTTAIQLASYFGA-TVYTTAKSEEKCLACLKLGAKH 193
             L   A++R G+TV + G   G+G++AIQLA  FGA  +      +EK     +LGA H
Sbjct: 177 GALKHAADVRPGETVAVIG-VGGVGSSAIQLAKAFGASPIIAVDVRDEKLAKAKELGATH 235

Query: 194 AINYLKEDFLEILQKETQGRGIDIILDMVGA-EYLNQHLTLLSKEGKLIIISFLGGNIAT 252
            +N  KED +  +++ T GRG+D++++ +G  E     L ++   G+ +++    G    
Sbjct: 236 TVNAAKEDAVAAIREITGGRGVDVVVEALGKPETFKLALDVVRDGGRAVVVGLAPGGATA 295

Query: 253 EINLNPIISKRITITGST-LRRRTDIAK 279
           EI +  ++ + I I GS   R R D+ +
Sbjct: 296 EIPITRLVRRGIKIIGSYGARPRQDLPE 323