Molecular Biotechnology

, Volume 60, Issue 6, pp 420–426 | Cite as

Haloquadratum walsbyi Yields a Versatile, NAD+/NADP+ Dual Affinity, Thermostable, Alcohol Dehydrogenase (HwADH)

  • Jennifer Cassidy
  • Francesca ParadisiEmail author
Original Paper


This study presents the first example of an alcohol dehydrogenase (ADH) from the halophilic archaeum Haloquadratum walsbyi (HwADH). A hexahistidine-tagged recombinant HwADH was heterologously overexpressed in Haloferax volcanii. HwADH was purified in one step and was found to be thermophilic with optimal activity at 65 °C. HwADH was active in the presence of 10% (v/v) organic solvent. The enzyme displayed dual cofactor specificity and a broad substrate scope, and maximum activity was detected with benzyl alcohol and 2-phenyl-1-propanol. HwADH accepted aromatic ketones, acetophenone and phenylacetone as substrates. The enzyme also accepted cyclohexanol and aromatic secondary alcohols, 1-phenylethanol and 4-phenyl-2-butanol. H. walsbyi may offer an excellent alternative to other archaeal sources to expand the toolbox of halophilic biocatalysts.


Haloquadratum walsbyi Alcohol dehydrogenase Thermoactivity Dual cofactor specificity 





Alcohol dehydrogenase


Immobilised metal-affinity chromatography




Sodium dodecyl sulphate–polyacrylamide gel electrophoresis




Benzyl alcohol













The authors wish to acknowledge the support from the Synthesis and Solid State Pharmaceutical Centre and Science Foundation Ireland, Grant Number 12/RC/2275, and Dr. Thorsten Allers for useful discussions.


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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of ChemistryUniversity of NottinghamUniversity ParkUK
  2. 2.Synthesis and Solid State Pharmaceutical Centre (SSPC), School of ChemistryUniversity College DublinBelfield, Dublin 4Ireland

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