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Everyone loves an underdog: metabolic engineering of the xylose oxidative pathway in recombinant microorganisms

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Abstract

The d-xylose oxidative pathway (XOP) has recently been employed in several recombinant microorganisms for growth or for the production of several valuable compounds. The XOP is initiated by d-xylose oxidation to d-xylonolactone, which is then hydrolyzed into d-xylonic acid. d-Xylonic acid is then dehydrated to form 2-keto-3-deoxy-d-xylonic acid, which may be further dehydrated then oxidized into α-ketoglutarate or undergo aldol cleavage to form pyruvate and glycolaldehyde. This review introduces a brief discussion about XOP and its discovery in bacteria and archaea, such as Caulobacter crescentus and Haloferax volcanii. Furthermore, the current advances in the metabolic engineering of recombinant strains employing the XOP are discussed. This includes utilization of XOP for the production of diols, triols, and short-chain organic acids in Escherichia coli, Saccharomyces cerevisiae, and Corynebacterium glutamicum. Improving the d-xylose uptake, growth yields, and product titer through several metabolic engineering techniques bring some of these recombinant strains close to industrial viability. However, more developments are still needed to optimize the XOP pathway in the host strains, particularly in the minimization of by-product formation.

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Funding

This work was supported by Korea Research Fellowship Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2015H1D3A1062172 and 2016R1C1B1013252) and by the Ministry of Education (No. 2018R1D1A1B07043993 and No. 2009-0093816).

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Correspondence to Huaiwei Liu or Wook-Jin Chung.

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

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Valdehuesa, K.N.G., Ramos, K.R.M., Nisola, G.M. et al. Everyone loves an underdog: metabolic engineering of the xylose oxidative pathway in recombinant microorganisms. Appl Microbiol Biotechnol 102, 7703–7716 (2018). https://doi.org/10.1007/s00253-018-9186-z

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  • DOI: https://doi.org/10.1007/s00253-018-9186-z

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