RPSBLAST alignment for GI: 254780290 and conserved domain: cd05280
>gnl|CDD|176183 cd05280, MDR_yhdh_yhfp, Yhdh and yhfp-like putative quinone oxidoreductases. Yhdh and yhfp-like putative quinone oxidoreductases (QOR). QOR catalyzes the conversion of a quinone + NAD(P)H to a hydroquinone + NAD(P)+. Quinones are cyclic diones derived from aromatic compounds. Membrane bound QOR actin the respiratory chains of bacteria and mitochondria, while soluble QOR acts to protect from toxic quinones (e.g. DT-diaphorase) or as a soluble eye-lens protein in some vertebrates (e.g. zeta-crystalin). QOR reduces quinones through a semi-quinone intermediate via a NAD(P)H-dependent single electron transfer. QOR is a member of the medium chain dehydrogenase/reductase family, but lacks the zinc-binding sites of the prototypical alcohol dehydrogenases of this group. 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 = 61.8 bits (151), Expect = 2e-10
Identities = 63/224 (28%), Positives = 97/224 (43%), Gaps = 31/224 (13%)
Query: 22 FLAESPIPQPQKEEILIKVEAIGVNRPDVMQRKGLYPPPKNANPILGLEVAGKIVDLGEN 81
FL P+ + ++LI+V +N D + G +N G++ AG +V +
Sbjct: 16 FLRTLPLDDLPEGDVLIRVHYSSLNYKDALAATGNGGVTRNYPHTPGIDAAGTVVSSDDP 75
Query: 82 TTHWNIGDEVCALVNG--------GGYAEYCLSHQGHTLPIPKGYNAIQAASLPESFFTV 133
+ GDEV LV G GG+AEY +P+P+G + +A L + FT
Sbjct: 76 R--FREGDEV--LVTGYDLGMNTDGGFAEYVRVPADWVVPLPEGLSLREAMILGTAGFT- 130
Query: 134 WANLFQTANLRSGQT-----VLIHGGSSGIGTTAIQLASYFGATVY-TTAKSEEKCLACL 187
A L +GQT VL+ G + G+G+ A+ + + G TV T K E+
Sbjct: 131 -AALSVHRLEDNGQTPEDGPVLVTGATGGVGSIAVAILAKLGYTVVALTGKEEQADYL-K 188
Query: 188 KLGAKHAINYLKEDFLEI----LQKETQGRGIDIILDMVGAEYL 227
LGA ++ +ED L+ L K I D VG + L
Sbjct: 189 SLGASEVLD--REDLLDESKKPLLKARWAGAI----DTVGGDVL 226