Redirecting the lipid metabolism of the yeast Starmerella bombicola from glycolipid to fatty acid production
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Accepted version
Author(s)
Jezierska, Sylwia
Claus, Silke
Ledesma-Amaro, Rodrigo
Van Bogaert, Inge
Type
Journal Article
Abstract
Free fatty acids are basic oleochemicals implemented in a range of applications including surfactants, lubricants, paints, plastics, and cosmetics. Microbial fatty acid biosynthesis has gained much attention as it provides a sustainable alternative for petrol- and plant oil-derived chemicals. The yeast Starmerella bombicola is a microbial cell factory that naturally employs its powerful lipid metabolism for the production of the biodetergents sophorolipids (> 300 g/L). However, in this study we exploit the lipidic potential of S. bombicola and convert it from the glycolipid production platform into a free fatty acid cell factory. We used several metabolic engineering strategies to promote extracellular fatty acid accumulation which include blocking competing pathways (sophorolipid biosynthesis and β-oxidation) and preventing free fatty acid activation. The best producing mutant (Δcyp52m1Δfaa1Δmfe2) secreted 0.933 g/L (± 0.04) free fatty acids with a majority of C18:1 (43.8%) followed by C18:0 and C16:0 (40.0 and 13.2%, respectively). Interestingly, deletion of SbFaa1 in a strain still producing sophorolipids also resulted in 25% increased de novo sophorolipid synthesis (P = 0.0089) and when oil was supplemented to the same strain, a 50% increase in sophorolipid production was observed compared to the wild type (P = 0.03). We believe that our work is pivotal for the further development and exploration of S. bombicola as a platform for synthesis of environmentally friendly oleochemicals.
Date Issued
2019-12-01
Date Acceptance
2019-09-04
Citation
Journal of Industrial Microbiology and Biotechnology, 2019, 46 (12), pp.1697-1706
ISSN
0169-4146
Publisher
Springer Verlag
Start Page
1697
End Page
1706
Journal / Book Title
Journal of Industrial Microbiology and Biotechnology
Volume
46
Issue
12
Copyright Statement
© Society for Industrial Microbiology and Biotechnology 2019. The final publication is available at Springer via https://link.springer.com/article/10.1007%2Fs10295-019-02234-x
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/31512095
PII: 10.1007/s10295-019-02234-x
Subjects
Free fatty acid
Lipid metabolism
Sophorolipid
Starmerella bombicola
Yeast
Publication Status
Published
Coverage Spatial
Germany
Date Publish Online
2019-09-11