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Efficient production of cellobionic acid using whole-cell biocatalyst of genetically modified Pseudomonas taetrolens

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Abstract

Pseudomonas taetrolens has previously been shown to convert cellobiose to cellobionic acid (CBA), which can potentially be used in cosmetics, food, and pharmaceutical industries. The cellobiose-oxidizing activity of the P. taetrolens strain, which expressed the homologous quinoprotein glucose dehydrogenase (GDH), was increased by approximately 50.8% compared to the original strain. Whole-cell biocatalyst (WCB) of the genetically modified P. taetrolens strain [pDSK-GDH] was prepared simply by fermentation and washing processes. Reaction conditions for the proper use of WCB, such as reaction temperature, cell density to be added, and cell harvest time for preparing WCB, were investigated. The highest CBA productivity (18.2 g/L/h) was achieved when WCB prepared in the late-exponential phase of cell culture was used at 35 °C with cell density of 10 at OD600nm. Under these conditions, 200 g/L of cellobiose was all converted to CBA in 11 h, and the WCB of P. taetrolens [pDSK-GDH] maintained the maximum catalytic activity during at least six cycles without a significant decline in the productivity. Our results suggest that the manufacture of WCB based on genetically engineered P. taetrolens and its optimized use could be further developed as an economically viable option for the large-scale production of CBA.

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Abbreviations

CBA:

Cellobionic acid

GDH:

Quinoprotein glucose dehydrogenase

WCBs:

Whole-cell biocatalysts

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Funding

This work was supported in part by the R&D program of MOTIE/KEIT (10077291), the R&D program of KRICT (SS2142-10, BSF21-505), and the R&D program of Ulsan-KRICT (US21-12, US21-12-01).

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Authors and Affiliations

  1. Bio-Based Chemistry Research Center, Korea Research Institute of Chemical Technology (KRICT), Ulsan, 44429, Republic of Korea

    Yu-Ri Oh & Gyeong Tae Eom

  2. Bio-Based Chemistry Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea

    Jae Kwang Song

  3. Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea

    Gyeong Tae Eom

Authors
  1. Yu-Ri Oh
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  2. Jae Kwang Song
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  3. Gyeong Tae Eom
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Contributions

YRO: Investigation, validation, data curation, and writing—original draft. JKS: Data curation, writing—original draft, and writing—review and editing. GTE: Conceptualization, project administration, supervision, writing—original draft, writing—review and editing, funding acquisition, and resources.

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Correspondence to Gyeong Tae Eom.

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Oh, YR., Song, J.K. & Eom, G.T. Efficient production of cellobionic acid using whole-cell biocatalyst of genetically modified Pseudomonas taetrolens. Bioprocess Biosyst Eng 45, 1057–1064 (2022). https://doi.org/10.1007/s00449-022-02725-9

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  • DOI: https://doi.org/10.1007/s00449-022-02725-9

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