Abstract
This study aimed to express an inulinase gene from the yeast Kluyveromyces marxianus (KmINU) in Aurantiochytrium sp. and realized one-step utilization of inulin resource for DHA production without any chemical pretreatment. An expression cassette with a length of 6052 bp for expressing the inulinase gene was constructed by a fast two-step PCR method and then was transferred into the Aurantiochytrium sp. cells. The Aurantiochytrium sp. recombinant T39 was selected with an inulinase activity up to 50.1 U/mL in 72 h. In a 5-l fed-batch fermentation, as high as 148.9 g/L of inulin was directly used within 120 h, and only 1.2 g/L of total sugar was left in the medium at the end of fermentation. The biomass of 51.4 g/L with a lipid content of 69.2% DCW and a DHA yield of 14.9 g/L was obtained.
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Abbreviations
- DHA:
-
Docosahexaenoic acid
- IOS:
-
Inulooligosaccharide
- SP:
-
Signal peptide
- Pac :
-
Actin promoter
- Pubi :
-
Ubiquitin promoter
- LB:
-
Luria–Bertani medium
- Torfc :
-
OrfC terminator
- KmINU:
-
The inulinase gene from Kluyveromyces marxianus
- DCW:
-
Dry cell weight
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Acknowledgements
This study was financially supported by the Zhejiang Provincial Natural Science Foundation of China (No. LY18C010004).
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Yu, XJ., Wang, ZP., Liang, MJ. et al. One-step utilization of inulin for docosahexaenoic acid (DHA) production by recombinant Aurantiochytrium sp. carrying Kluyveromyces marxianus inulinase. Bioprocess Biosyst Eng 43, 1801–1811 (2020). https://doi.org/10.1007/s00449-020-02371-z
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DOI: https://doi.org/10.1007/s00449-020-02371-z