Abstract
Trichosporon cutaneum, a dimorphic oleaginous yeast, has immense biotechnological potential, which can use lignocellulose hydrolysates to accumulate lipids. Our preliminary studies on its dimorphic transition suggested that pH can significantly induce its morphogenesis. However, researches on dimorphic transition correlating with lipid biosynthesis in oleaginous yeasts are still limited. In this study, the unicellular yeast cells induced under pH 6.0–7.0 shake flask cultures resulted in 54.32% lipid content and 21.75 g/L dry cell weight (DCW), so lipid production was over threefold than that in hypha cells induced by acidic condition (pH 3.0–4.0). Furthermore, in bioreactor batch cultivation, the DCW and lipid content in unicellular yeast cells can reach 21.94 g/L and 58.72%, respectively, both of which were also more than twofold than that in hypha cells. Moreover, the activities of isocitrate dehydrogenase (IDH), malic enzyme (MAE), isocitrate lyase (ICL) and ATP citrate lyase (ACL) in unicellular cells were all higher than in the hyphal cells. In the meanwhile, the transcriptome data showed that the genes related to fatty acid biosynthesis, carbon metabolism and encoded Rim101 and cAMP–PKA signaling transduction pathways were significantly up-regulated in unicellular cells, which may play an important role in enhancing the lipid accumulation. In conclusion, our results provided insightful information focused on the molecular mechanism of dimorphic transition and process optimization for enhancing lipid accumulation in T. cutaneum.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 31760021, 21466015), the Jiangxi Provincial Science Foundation for Distinguished Young Scholars (20171BCB23037), the Foundation of Jiangxi Provincial Department of Education (No. GJJ160310) and Jiangxi Provincial Department of Education for Technological Innovations.
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Wang, Y., Tang, L.J., Peng, X. et al. Transcriptome analysis of the dimorphic transition induced by pH change and lipid biosynthesis in Trichosporon cutaneum. J Ind Microbiol Biotechnol 47, 49–61 (2020). https://doi.org/10.1007/s10295-019-02244-9
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DOI: https://doi.org/10.1007/s10295-019-02244-9