Abstrakti
D-Xylonate was produced from D-xylose using Kluyveromyces lactis strains which expressed the gene for NADP(+)-dependent D-xylose dehydrogenase from Trichoderma reesei (xyd1). Up to 19 +/- 2 g D-xylonate l(-1) was produced when K. lactis expressing xyd1 was grown on 10.5 g D-galactose l (1) and 40 g D-xylose l (1). Intracellular accumulation of D-xylonate (up to similar to 70 mg [g biomass](-1)) was observed.
D-Xylose was metabolised to D-xylonate, xylitol and biomass. Oxygen could be reduced to 6 mmol O(2) l(-1) h(-1) without loss in titre or production rate, but metabolism of D-xylose and xylitol were more efficient when 12 mmol O(2) l(-1) h(-1) were provided.
D-Xylose uptake was not affected by deletion of either the D-xylose reductase (XYL1) or a putative xylitol dehydrogenase encoding gene (XYL2) in xyd1 expressing strains. K. lactis xyd1 Delta XYL1 did not produce extracellular xylitol and produced more D-xylonate than the xyd1 strain containing the endogenous XYL1. K. lactis xyd1 Delta XYL2 produced high concentrations of xylitol and significantly less D-xylonate than the xyd1 strain with the endogenous XYL2. (C) 2011 Elsevier Inc. All rights reserved.
| Alkuperäiskieli | Englanti |
|---|---|
| Sivut | 383-391 |
| Sivumäärä | 9 |
| Julkaisu | Metabolic Engineering |
| Vuosikerta | 13 |
| Numero | 4 |
| DOI - pysyväislinkit | |
| Tila | Julkaistu - heinäk. 2011 |
| OKM-julkaisutyyppi | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä |
Rahoitus
Technical assistance of Tarja Laakso, Outi Kononen and Tuuli Teikari is gratefully acknowledged. This study was financially supported by the Academy of Finland through the Centre of Excellence in White Biotechnology-Green Chemistry (grant 118573). The financial support of the European Commission through the Sixth Framework Programme Integrated Project BioSynergy (038994-SES6) is also gratefully acknowledged.
Sormenjälki
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