Fed-batch fermentation of mixed carbon source significantly enhances the production of docosahexaenoic acid in Thraustochytriidae sp. PKU#Mn16 by differentially regulating fatty acids biosynthetic pathways.
Bioresour Technol
; 297: 122402, 2020 Feb.
Article
en En
| MEDLINE
| ID: mdl-31761627
ABSTRACT
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⯱â¯1.5â¯g/L), DHA yield (Yp/s 8.65) and productivity (100.7⯱â¯2.9â¯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 ß-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.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Carbono
/
Ácidos Docosahexaenoicos
Idioma:
En
Año:
2020
Tipo del documento:
Article