A Membrane-Bound Gluconate Dehydrogenase from 2-Keto-d-Gluconic Acid Industrial Producing Strain Pseudomonas plecoglossicida JUIM01: Purification, Characterization, and Gene Identification

  • Da-Ming Wang
  • Lei Sun
  • Wen-Jing SunEmail author
  • Feng-Jie Cui
  • Jin-Song Gong
  • Xiao-Mei Zhang
  • Jin-Song Shi
  • Zheng-Hong XuEmail author


The membrane-bound gluconate dehydrogenase (mGADH) is a critical enzyme for 2-keto-d-gluconic acid (2KGA) production in Pseudomonas plecoglossicida JUIM01. The purified native flavin adenine dinucleotide-dependent mGADH (FAD-mGADH) was consisted of a gamma subunit, a flavoprotein subunit, and a cytochrome c subunit with molecular mass of ~ 27, 65, and 47 kDa, respectively. The specific activity of FAD-mGADH was determined as 90.71 U/mg at optimum pH and temperature of 6.0 and 35 °C. The Km and Vmax values of calcium d-gluconate were 0.631 mM and 0.734 mM/min. The metal ions Mg2+ and Mn2+ showed slight positive effects on FAD-mGADH activity. On the other hand, a 3868-bp-length gad gene cluster was amplified and expressed in Escherichia coli BL21(DE3). The recombinant protein showed the same molecular weight and enzyme activity as the native FAD-mGADH, which confirmed it as a FAD-mGADH encoding gene. The flavoprotein subunit and the cytochrome c subunit containing a putative FAD-binding motif and three possible heme-binding motifs concluded from alignment results of mGADHs. This study characterized the native and recombinant FAD-mGADH and would provide the basis for further genetic modification of Pseudomonas plecoglossicida JUIM01 with the intention of 2KGA productivity improvement.


Pseudomonas plecoglossicida 2-Keto-d-gluconic acid (2KGA) Gluconate dehydrogenase Heterologous expression 



Many thanks go to Ph.D. Xue Cai (Jiangnan University) for her help regarding the language polish of this manuscript.

Funding Information

This work was financially supported by the National Natural Science Foundation of China (31571885), the Innovation Group Construction Program of Jiangxi Province (20142BCB24024), the Science & Technology Program of Jiangxi Province (No. [2015]64), Science & Technology Program of Dexing city (No. [2015]44), and the National First-class Discipline Program of Light Industry Technology and Engineering (LITE2018-11 and LITE2018-18).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Da-Ming Wang
    • 1
    • 2
  • Lei Sun
    • 1
  • Wen-Jing Sun
    • 2
    • 3
    Email author
  • Feng-Jie Cui
    • 2
    • 3
  • Jin-Song Gong
    • 1
  • Xiao-Mei Zhang
    • 1
  • Jin-Song Shi
    • 1
  • Zheng-Hong Xu
    • 1
    Email author
  1. 1.The Key Laboratory of Industrial Biotechnology, Ministry of Education, National Engineering Laboratory for Cereal Fermentation Technology, School of BiotechnologyJiangnan UniversityWuxiPeople’s Republic of China
  2. 2.Parchn Sodium Isovitamin C Co., Ltd.DexingPeople’s Republic of China
  3. 3.School of Food and Biological EngineeringJiangsu UniversityZhenjiangPeople’s Republic of China

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