Project description:Our preliminary analysis identifies that glycerol enhanced DHA accumulation in native isolate Aurantiochytrium limacinum. To evaluate temporal changes in the presence of glycerol, time-course metabolite profiling was done in the presence of glycerol and glucose at three different time-points i.e., 0, 48 and 96 h using GC-MS. We identified nearly 40 metabolites, among which metabolites belonging to pentose phosphate pathway, TCA cycle and amino acid metabolism were significantly differentially regulated which suggests its role in glycerol induced DHA accumulation.
Project description:Thraustochytrids of the genera Schizochytrium and Aurantiochytrium accumulate oils rich in the essential, marine n3 fatty acid docosahexaenoic acid (DHA). DHA production in Aurantiochytrium sp T66 was studied with the aim to provide more knowledge about factors that affect the DHA-productivities and the contributions of the two enzyme systems used for fatty acid synthesis in thraustochytrids, fatty acid synthetase (FAS) and PUFA-synthase. Fermentations with nitrogen starvation, which is well-known to initiate lipid accumulation in oleaginous organisms, were compared to fermentations with nitrogen in excess where lipid accumulation was obtained by oxygen limitation. The specific productivities of fatty acids originating from FAS were considerably higher under nitrogen starvation than with nitrogen in excess, while the specific productivities of DHA were the same at both conditions. Global transcriptome analysis showed significant up-regulation of FAS under N-deficient conditions, while the PUFA-synthase genes were only marginally upregulated. Neither of them was upregulated under O2-limitation where nitrogen was in excess, suggesting that N-starvation mainly affects the FAS and may be less important for the PUFA-synthase. The transcriptome analysis also revealed responses likely to be related to the generation of reducing power (NADPH) for fatty acid synthesis.
2019-12-19 | GSE134374 | GEO
Project description:Genome and transcriptome of Aurantiochytrium sp.SK4
| PRJNA495801 | ENA
Project description:Transcriptome analysis of carotenoids biosynthesis in Schizochytrium limacinum B4D1 by methanol induction.
