Metal cofactor regulation combined with rational genetic engineering of Schizochytrium sp. for high-yield production of squalene.
Biotechnol Bioeng
; 120(4): 1026-1037, 2023 04.
Article
in En
| MEDLINE
| ID: mdl-36522292
ABSTRACT
The increasing market demand for squalene requires novel biotechnological production platforms. Schizochytrium sp. is an industrial oleaginous host with a high potential for squalene production due to its abundant native acetyl-CoA pool. We first found that iron starvation led to the accumulation of 1.5 g/L of squalene by Schizochytrium sp., which was 40-fold higher than in the control. Subsequent transcriptomic and lipidomic analyses showed that the high squalene titer is due to the diversion of precursors from lipid biosynthesis and increased triglycerides (TAG) content for squalene storage. Furthermore, we constructed the engineered acetyl-CoA C-acetyltransferase (ACAT)-overexpressing strain 18SACAT, which produced 2.79 g/L of squalene, representing an 86% increase over the original strain. Finally, a nitrogen-rich feeding strategy was developed to further increase the squalene titer of the engineered strain, which reached 10.78 g/L in fed-batch fermentation, a remarkable 161-fold increase over the control. To our best knowledge, this is the highest squalene yield in thraustochytrids reported to date.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Squalene
/
Metabolic Engineering
Language:
En
Journal:
Biotechnol Bioeng
Year:
2023
Document type:
Article
Affiliation country:
China