Skip to main content
Log in

Understanding D-xylonic acid accumulation: a cornerstone for better metabolic engineering approaches

  • Mini-Review
  • Published:
Applied Microbiology and Biotechnology Aims and scope Submit manuscript

Abstract

The xylose oxidative pathway (XOP) has been engineered in microorganisms for the production of a wide range of industrially relevant compounds. However, the performance of metabolically engineered XOP-utilizing microorganisms is typically hindered by D-xylonic acid accumulation. It acidifies the media and perturbs cell growth due to toxicity, thus curtailing enzymatic activity and target product formation. Fortunately, from the growing portfolio of genetic tools, several strategies that can be adapted for the generation of efficient microbial cell factories have been implemented to address D-xylonic acid accumulation. This review centers its discussion on the causes of D-xylonic acid accumulation and how to address it through different engineering and synthetic biology techniques with emphasis given on bacterial strains. In the first part of this review, the ability of certain microorganisms to produce and tolerate D-xylonic acid is also tackled as an important aspect in developing efficient microbial cell factories. Overall, this review could shed some insights and clarity to those working on XOP in bacteria and its engineering for the development of industrially applicable product-specialist strains.

Key points

  • D-Xylonic acid accumulation is attributed to the overexpression of xylose dehydrogenase concomitant with basal or inefficient expression of enzymes involved in D-xylonic acid assimilation.

  • Redox imbalance and insufficient cofactors contribute to D-xylonic acid accumulation.

  • Overcoming D-xylonic acid accumulation can increase product formation among engineered strains.

  • Engineering strategies involving enzyme engineering, evolutionary engineering, coutilization of different sugar substrates, and synergy of different pathways could potentially address D-xylonic acid accumulation.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3.
Fig. 4

Similar content being viewed by others

References

Download references

Funding

This work was supported by the National Research Foundation of Korea (NRF) under the Basic Science Research Program through the Ministry of Education (2021R1F1A1045612 and 2020R1A6A1A03038817) and by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry & Energy (MOTIE No. 20194010201750).

Author information

Authors and Affiliations

Authors

Contributions

ABB conceived the outline of the review, wrote the manuscript, and prepared the figures. GMN supervised and revised the manuscript. KNGV revised the manuscript. WKL and WJC supervised and finalized the manuscript. All authors read and approved the final version of the manuscript.

Corresponding authors

Correspondence to Won-Keun Lee or Wook-Jin Chung.

Ethics declarations

Ethics approval

This article does not contain any studies with human participants performed by any of the authors.

Conflict of interest

The authors declare no competing interests.

Additional information

Publisher’s note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Bañares, A.B., Nisola, G.M., Valdehuesa, K.N.G. et al. Understanding D-xylonic acid accumulation: a cornerstone for better metabolic engineering approaches. Appl Microbiol Biotechnol 105, 5309–5324 (2021). https://doi.org/10.1007/s00253-021-11410-y

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00253-021-11410-y

Keywords

Navigation