NADP-dependent alcohol dehydrogenase 6

UniProtKB accession:  Q04894

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UniProtKB description:  NADP-dependent, medium-chain alcohol dehydrogenase with a broad substrate specificity. Aldehydes exhibited 50-12000 times higher catalytic efficiency than the corresponding alcohols, therefore the major function of the enzyme is as an aldehyde reductase. The enzyme is active towards aromatic and aliphatic (linear and branched-chain) aldehydes. The enzyme is very active towards aromatic aldehydes, such as cinnamaldehyde, benzaldehyde and substituted benzaldehydes, such as veratraldehyde and panisaldehyde. It exhibits low activity towards substituted cinnamaldehydes, such as coniferaldehyde and sinapaldehyde. The enzyme has no activity with ketones, such as acetone or cyclohexanone. For the reverse reaction, linear and branched-chain primary alcohols are substrates, whereas very low activity is found with secondary alcohols, such as butan-2-ol (PubMed:11742541). The enzyme may be physiologically involved in several steps of the lignin degradation pathway, initiated by other microorganisms, in the synthesis of fusel alcohols, products derived from the aminoacidic metabolism, and in the homeostasis of NADP(H) (Probable). Has the ability to reduce 5-hydroxymethyl furfural (HMF), a furan derivative which is formed during the hydrolysis of lignocellulosic materials, to 5-hydroxymethylfurfuryl alcohol, thereby alleviating the inhibition of the fermentation of lignocellulose hydrolysates by HMF during fuel ethanol production (PubMed:16652391).