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A method of expression for an oxygen-tolerant group III alcohol dehydrogenase from Pyrococcus horikoshii OT3

  • Chikanobu Sugimoto
  • Kouta Takeda
  • Yumi Kariya
  • Hirotoshi Matsumura
  • Masafumi Yohda
  • Hiroyuki Ohno
  • Nobuhumi Nakamura
Original Paper

Abstract

NAD(P)-dependent group III alcohol dehydrogenases (ADHs), well known as iron-activated enzymes, generally lose their activities under aerobic conditions due to their oxygen-sensitivities. In this paper, we expressed an extremely thermostable group III ADH from the hyperthermophilic archaeon Pyrococcus horikoshii OT3 (PhADH) heterologously in Escherichia coli. When purified from a culture medium containing nickel, the recombinant PhADH (Ni-PhADH) contained 0.85 ± 0.01 g-atoms of nickel per subunit. Ni-PhADH retained high activity under aerobic conditions (9.80 U mg−1), while the enzyme expressed without adding nickel contained 0.46 ± 0.01 g-atoms of iron per subunit and showed little activity (0.27 U mg−1). In the presence of oxygen, the activity of the Fe2+-reconstituted PhADH prepared from the Ni-PhADH was gradually decreased, whereas the Ni2+-reconstituted PhADH maintained enzymatic activity. These results indicated that PhADH with bound nickel ion was stable in oxygen. The activity of the Ni2+-reconstituted PhADH prepared from the expression without adding nickel was significantly lower than that from the Ni-PhADH, suggesting that binding a nickel ion to PhADH in this expression system contributed to protecting against inactivation during the expression and purification processes. Unlike other thermophilic group III ADHs, Ni-PhADH showed high affinity for NAD(H) rather than NADP(H). Furthermore, it showed an unusually high k cat value toward aldehyde reduction. The activity of Ni-PhADH for butanal reduction was increased to 60.7 U mg−1 with increasing the temperature to 95 °C. These findings provide a new strategy to obtain oxygen-sensitive group III ADHs.

Keywords

Metalloenzyme Alcohol dehydrogenase (ADH) Nickel Extreme thermophile Archaea 

Notes

Acknowledgements

This work was financially supported by a Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Fellows (Grant Number 14J08641 to K.T.). This work was partly supported by Building of Consortia for the Development of Human Resources in Science and Technology, MEXT, Japan. We thank Assoc. Prof. Makoto Sakurai, Ms. Ayumi Nakagawa and Mr. Hiromitsu Sasaki for the measurements of ICP-OES and Dr. Yasuaki Yamanaka and Mr. Tomohiro Miki for the measurements of SEC-MALS analysis.

Supplementary material

775_2017_1439_MOESM1_ESM.pdf (318 kb)
Supplementary material 1 (PDF 318 kb)

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Copyright information

© SBIC 2017

Authors and Affiliations

  • Chikanobu Sugimoto
    • 1
  • Kouta Takeda
    • 1
  • Yumi Kariya
    • 1
  • Hirotoshi Matsumura
    • 2
  • Masafumi Yohda
    • 1
  • Hiroyuki Ohno
    • 1
  • Nobuhumi Nakamura
    • 1
  1. 1.Department of Biotechnology and Life ScienceTokyo University of Agriculture and TechnologyTokyoJapan
  2. 2.Department of Life Science, Graduate School and Faculty of Engineering ScienceAkita UniversityAkitaJapan

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