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Characterization of alcohol dehydrogenase from the haloalkaliphilic archaeon Natronomonas pharaonis

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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°C, respectively. The optimal pH was 9.0. Zn2+ significantly inhibited activity. The K m 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.

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Acknowledgments

This work was supported by the grants from the Major State Basic Research Development Program of China (973 Program) (Grant No. 2004CB719604-3) and the National Natural Science Foundation of China (Grant No. 30670048).

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Correspondence to Min Wu.

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Communicated by K. Horikoshi.

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Cao, Y., Liao, L., Xu, Xw. et al. Characterization of alcohol dehydrogenase from the haloalkaliphilic archaeon Natronomonas pharaonis . Extremophiles 12, 471–476 (2008). https://doi.org/10.1007/s00792-007-0133-7

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