期刊
BIORESOURCE TECHNOLOGY
卷 297, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122402
关键词
Batch fermentation; Bioreactor; Biomass; Transcriptome; FAS pathway; PKS pathway
资金
- China Ocean Mineral Resources R&D Association (COMRA) Program [DY135-B2-09]
- National Science Foundation of China [31670044, 91751115, 31602185]
- National Key R&D Program of China [2017YFC1404500]
This study reports comparative evaluation of the growth and DHA productivity of the thraustochytrid strain Thraustochytriidae PKU#Mn16 fermented with seven different substrate feeding strategies. Of these strategies, fed-batch fermentation of the mixed substrate (glucose & glycerol) yielded the maximum growth (52.2 +/- 1.5 g/ L), DHA yield (Y-p/s: 8.65) and productivity (100.7 +/- 2.9 mg/L-h), comparable with those of previously reported Aurantiochytrium strains. Transcriptomics analyses revealed that glucose upregulated some genes of the fatty acid synthase pathway whereas glycerol upregulated a few genes of the polyketide synthase pathway. Co-fermentation of the mixed substrate differentially regulated genes of these two pathways and significantly enhanced the DHA productivity. Furthermore, some genes involved in DNA replication, phagosome, carbon metabolism, and beta-oxidation were also found to alter significantly during the mixed-substrate fermentation. Overall, this study provides a unique strategy for enhancing growth and DHA productivity of the strain PKU#Mn16 and the first insight into the mechanisms underlying mixed-substrate fermentation.
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