A comparison of two novel alcohol dehydrogenase enzymes (ADH1 and ADH2) from the extreme halophile Haloferax volcanii

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Title: A comparison of two novel alcohol dehydrogenase enzymes (ADH1 and ADH2) from the extreme halophile Haloferax volcanii
Authors: Timpson, Leanne M.
Liliensiek, Ann-Kathrin
Alsafadi, Diya
Cassidy, Jennifer
Sharkey, Michael A.
Liddell, Susan
Allers, Thorsten
Paradisi, Francesca
Permanent link: http://hdl.handle.net/10197/4151
Date: Jan-2013
Abstract: Haloarchaeal alcohol dehydrogenases are exciting biocatalysts with potential industrial applications. In this study, two alcohol dehydrogenase enzymes from the extremely halophilic archaeon Haloferax volcanii (HvADH1 and HvADH2) were homologously expressed and subsequently purified by immobilized metal-affinity chromatography. The proteins appeared to copurify with endogenous alcohol dehydrogenases, and a double Δadh2 Δadh1 gene deletion strain was constructed to prevent this occurrence. Purified HvADH1 and HvADH2 were compared in terms of stability and enzymatic activity over a range of pH values, salt concentrations, and temperatures. Both enzymes were haloalkaliphilic and thermoactive for the oxidative reaction and catalyzed the reductive reaction at a slightly acidic pH. While the NAD+-dependent HvADH1 showed a preference for short-chain alcohols and was inherently unstable, HvADH2 exhibited dual cofactor specificity, accepted a broad range of substrates, and, with respect to HvADH1, was remarkably stable. Furthermore, HvADH2 exhibited tolerance to organic solvents. HvADH2 therefore displays much greater potential as an industrially useful biocatalyst than HvADH1.
Type of material: Journal Article
Publisher: Springer
Copyright (published version): 2013, Springer
Keywords: Alcohol dehydrogenase;Biocatalyst discovery;Protein characterization;Extremophile;Haloferax volcanii;Organic solvents
DOI: 10.1007/s00253-012-4074-4
Language: en
Status of Item: Not peer reviewed
Appears in Collections:Chemistry Research Collection

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