How do engineered Yarrowia lipolytica strains secrete free fatty acids: hints from comparative transcriptomics.

Area of Science:

• Microbial biotechnology
• Synthetic biology
• Biochemistry

Background:

• Yarrowia lipolytica is a key platform for microbial production of fatty acids.
• Deleting the faa1 gene facilitates the accumulation and secretion of free fatty acids (FFAs).
• Understanding FFA secretion mechanisms is crucial for optimizing microbial cell factories.

Purpose of the Study:

• To investigate the molecular mechanisms underlying free fatty acid secretion in Yarrowia lipolytica.
• To identify genes involved in the secretion of FFAs by comparing a mutant strain with a wild-type strain.

Main Methods:

• Transcriptomic analysis of a faa1 deletion mutant and a wild-type strain.
• Creation and analysis of deletion and overexpression mutants for 12 upregulated genes.
• Theoretical and experimental examination of cell wall-related proteins.

Main Results:

• No single gene deletion or overexpression clearly demonstrated a role in FFA export.
• Overexpression of Ygpi induced FFA production in a wild-type background.
• Several evaluated genes were implicated in resistance to FFA toxicity.

Conclusions:

• The mechanism of FFA secretion in Yarrowia lipolytica is complex and not attributable to a single gene.
• Cell wall-related proteins and potentially Ygpi may play roles in FFA production or transport.
• Further research is needed to fully elucidate the FFA secretion pathway.