| Literature DB >> 18189118 |
Yi Cao1, Li Liao, Xue-wei Xu, Aharon Oren, Ce Wang, Xu-feng Zhu, Min Wu.
Abstract
Alcohol dehydrogenase (ADH; EC: 1.1.1.1) is a key enzyme in production and utilization of ethanol. In this study, the gene encoding for ADH of the haloalkaliphilic archaeon Natronomonas pharaonis (NpADH), which has a 1,068-bp open reading frame that encodes a protein of 355 amino acids, was cloned into the pET28b vector and was expressed in Escherichia coli. Then, NpADH was purified by Ni-NTA affinity chromatography. The recombinant enzyme showed a molecular mass of 41.3 kDa by SDS-PAGE. The enzyme was haloalkaliphilic and thermophilic, being most active at 5 M NaCl or 4 M KCl and 70 degrees C, respectively. The optimal pH was 9.0. Zn2+ significantly inhibited activity. The Km value for acetaldehyde was higher than that for ethanol. It was concluded that the physiological role of this enzyme is likely the catalysis of the oxidation of ethanol to acetaldehyde.Entities:
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Year: 2008 PMID： 18189118 DOI： 10.1007/s00792-007-0133-7
Source DB: PubMed Journal: Extremophiles ISSN： 1431-0651 Impact factor: 2.395