>gnl|CDD|176257 cd08297, CAD3, Cinnamyl alcohol dehydrogenases (CAD). These alcohol dehydrogenases are related to the cinnamyl alcohol dehydrogenases (CAD), members of the medium chain dehydrogenase/reductase family. NAD(P)(H)-dependent oxidoreductases are the major enzymes in the interconversion of alcohols and aldehydes, or ketones. Cinnamyl alcohol dehydrogenases (CAD) reduce cinnamaldehydes to cinnamyl alcohols in the last step of monolignal metabolism in plant cells walls. CAD binds 2 zinc ions and is NADPH- dependent. CAD family members are also found in non-plant species, e.g. in yeast where they have an aldehyde reductase activity. The medium chain dehydrogenases/reductase (MDR)/zinc-dependent alcohol dehydrogenase-like family, which contains the zinc-dependent alcohol dehydrogenase (ADH-Zn) and related proteins, is a diverse group of proteins related to the first identified member, class I mammalian ADH. MDRs display a broad range of activities and are distinguished from the smaller short chain dehydrogenases (~ 250 amino acids vs. the ~ 350 amino acids of the MDR). The MDR proteins have 2 domains: a C-terminal NAD(P) binding-Rossmann fold domain of a beta-alpha form and an N-terminal catalytic domain with distant homology to GroES. The MDR group contains a host of activities, including the founding alcohol dehydrogenase (ADH), quinone reductase, sorbitol dehydrogenase, formaldehyde dehydrogenase, butanediol DH, ketose reductase, cinnamyl reductase, and numerous others. The zinc-dependent alcohol dehydrogenases (ADHs) catalyze the NAD(P)(H)-dependent interconversion of alcohols to aldehydes or ketones. Active site zinc has a catalytic role, while structural zinc aids in stability. ADH-like proteins typically form dimers (typically higher plants, mammals) or tetramers (yeast, bacteria), and generally have 2 tightly bound zinc atoms per subunit. The active site zinc is coordinated by a histidine, two cysteines, and a water molecule. The second zinc seems to play a structural role, affects subunit interactions, and is typically coordinated by 4 cysteines. Length = 341

 Score =  139 bits (352), Expect = 1e-33
 Identities = 87/333 (26%), Positives = 146/333 (43%), Gaps = 42/333 (12%)

Query: 27  PIPQPQKEEILIKVEAIGVNRPDVMQRKGLYPPPKNANPILGLEVAGKIVDLGENTTHWN 86
           P+P+P   E+L+K+EA GV   D+    G +P       I G E AG +V +G   +   
Sbjct: 20  PVPEPGPGEVLVKLEASGVCHTDLHAALGDWPVKPKLPLIGGHEGAGVVVAVGPGVSGLK 79

Query: 87  IGD--------------EVC----------ALVNG----GGYAEYCLSHQGHTLPIPKGY 118
           +GD              E C             +G    G +AEY ++   +  PIP G 
Sbjct: 80  VGDRVGVKWLYDACGKCEYCRTGDETLCPNQKNSGYTVDGTFAEYAIADARYVTPIPDGL 139

Query: 119 NAIQAASLPESFFTVWANLFQTANLRSGQTVLIHGGSSGIGTTAIQLASYFGATVYTTAK 178
           +  QAA L  +  TV+  L + A L+ G  V+I G   G+G   +Q A   G  V     
Sbjct: 140 SFEQAAPLLCAGVTVYKAL-KKAGLKPGDWVVISGAGGGLGHLGVQYAKAMGLRVIAIDV 198

Query: 179 SEEKCLACLKLGAKHAINYLKEDFLEILQKETQGRGID-IILDMVGAEYLNQHLTLLSKE 237
            +EK     +LGA   +++ K D +E +++ T G G   +++  V A    Q L  L   
Sbjct: 199 GDEKLELAKELGADAFVDFKKSDDVEAVKELTGGGGAHAVVVTAVSAAAYEQALDYLRPG 258

Query: 238 GKLIIISFLGGNIATEINLNPIISKRITITGSTLRRRTDIAKQSIRDSLQLKIWPLLNSH 297
           G L+ +    G     ++   ++ + ITI GS +  R D     ++++L+          
Sbjct: 259 GTLVCVGLPPGGFI-PLDPFDLVLRGITIVGSLVGTRQD-----LQEALE-----FAARG 307

Query: 298 VIAPVIHTVLPLGKVAMAHDIMEKSEHIGKIIL 330
            + P I  V+PL  +    + ME+ +  G++++
Sbjct: 308 KVKPHI-QVVPLEDLNEVFEKMEEGKIAGRVVV 339