RPSBLAST alignment for GI: 254780290 and conserved domain: cd08264
>gnl|CDD|176225 cd08264, Zn_ADH_like2, Alcohol dehydrogenases of the MDR family. This group resembles the zinc-dependent alcohol dehydrogenases of the medium chain dehydrogenase family. However, this subgroup does not contain the characteristic catalytic zinc site. Also, it contains an atypical structural zinc-binding pattern: DxxCxxCxxxxxxxC. 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. 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 = 325
Score = 101 bits (253), Expect = 3e-22
Identities = 88/318 (27%), Positives = 150/318 (47%), Gaps = 51/318 (16%)
Query: 7 MRHVAMSGYGKSNVMFLAESPIPQPQKEEILIKVEAIGVNRPD--VMQRKGLYPPPKNAN 64
M+ + G N+ + P+P E+LI+V+ GVN D V+ + P P
Sbjct: 1 MKALVFEKSGIENLKVE-DVKDPKPGPGEVLIRVKMAGVNPVDYNVINAVKVKPMPH--- 56
Query: 65 PILGLEVAGKIVDLGENTTHWNIGDEV----------CAL---------VNG-------- 97
I G E AG + ++G++ GD V C + NG
Sbjct: 57 -IPGAEFAGVVEEVGDHVKGVKKGDRVVVYNRVFDGTCDMCLSGNEMLCRNGGIIGVVSN 115
Query: 98 GGYAEYCLSHQGHTLPIPKGYNAIQAASLPESFFTVWANLFQTANLRSGQTVLIHGGSSG 157
GGYAEY + + + IP + AASLP + T + + +TA L G+TV++ G S
Sbjct: 116 GGYAEYIVVPEKNLFKIPDSISDELAASLPVAALTAY-HALKTAGLGPGETVVVFGASGN 174
Query: 158 IGTTAIQLASYFGATVYTTAKSEEKCLACLKLGAKHAINY--LKEDFLEILQKETQGRGI 215
G A+QLA GA V A S + L + GA ++Y ++E EI +
Sbjct: 175 TGIFAVQLAKMMGAEVI--AVSRKDWLK--EFGADEVVDYDEVEEKVKEIT------KMA 224
Query: 216 DIILDMVGAEYLNQHLTLLSKEGKLIII-SFLGGNIATEINLNPIISKRITITGSTLRRR 274
D++++ +G+ + + L++L + G+L+ + GG + ++L+ + SK+I+I GST R
Sbjct: 225 DVVINSLGSSFWDLSLSVLGRGGRLVTFGTLTGGEVK--LDLSDLYSKQISIIGSTGGTR 282
Query: 275 TDIAK-QSIRDSLQLKIW 291
++ + I L++K+W
Sbjct: 283 KELLELVKIAKDLKVKVW 300