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Single cell oil production on molasses by Yarrowia lipolytica strains overexpressing DGA2 in multicopy.

Abstract：

:Yarrowia lipolytica is a promising platform for single cell oil production. It is well-known for its metabolism oriented toward utilization of hydrophobic substrates and accumulation of storage lipids. Multiple copies of DGA2 under constitutive promoter were introduced into the Q4 strain, a quadruple mutant deleted for the four acyltransferases (Δdga1, Δdga2, Δlro1, and Δare1) to improve lipid accumulation. The Q4-DGA2 x3 strain contains three copies of DGA2. Further increase in accumulation was accomplished by blocking the β-oxidation pathway through MFE1 gene deletion yielding Q4-Δmfe DGA2 x3. In order to use molasses as a substrate for single cell oil production, sucrose utilization was established by expressing the Saccharomyces cerevisiae SUC2 gene yielding Q4-SUC2 DGA2 x3 and Q4-Δmfe SUC2 DGA2 x3. During cultivation on sucrose medium with a carbon to nitrogen ratio of 80, both strains accumulated more than 40 % of lipids, which was a 2-fold increase in lipid storage. Q4-Δmfe SUC2 DGA2 x3 accumulated more lipids than Q4-SUC2 DGA2 x3 (49 vs. 43 %) but yielded less biomass (13.7 vs. 15 g/L). When grown on 8 % (v/v) molasses, both strains accumulated more than 30 % of lipids after 3 days, while biomass yield was higher in Q4-SUC2 DGA2 x3 (16.4 vs. 14.4 g/L). Further addition of molasses at 72 h resulted in higher biomass yield, 26.6 g/L for Q4-SUC2 DGA2 x3, without modification of lipid content. This work presents genetically modified strains of Y. lipolytica as suitable tools for direct conversion of industrial molasses into value added products based on single cell oils.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Gajdoš P,Nicaud JM,Rossignol T,Čertík M

doi

10.1007/s00253-015-6733-8

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

8065-74

issue

19

eissn

0175-7598

issn

1432-0614

journal_volume

99

pub_type

杂志文章

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