Abstract
Sucrose non-fermenting 1 (SNF1) plays a crucial role in utilizing non-glucose carbon sources and regulating lipid metabolism. However, the mechanism by which SNF1 regulates lipid accumulation in oleaginous filamentous fungi in response to nutrient signals remains unclear. In the present study, by analysing the growth and lipid accumulation of M. circinelloides on xylose under nitrogen limitation, combined with the transcriptional changes of each subunit of SNF1, the regulation of SNF1 between nutrient signal and lipid accumulation was explored. The results showed that with the increase of carbon/nitrogen (C/N) ratio, the xylose consumption and cell growth of M. circinelloides decreased, and the lipid accumulation increased gradually. The optimal C/N ratio was 160:1, and the maximum lipid yield was 4.1 g/L. Two subunits of SNF1, Snf-α1 and Snf-β, are related to the regulation of lipid metabolism in response to nutrient signals from different external nitrogen sources. This is the first report on the transcriptional analysis of SNF1 subunits on xylose metabolism under nitrogen limitation. This study provides a basis for further understanding of lipid synthesis mechanism on xylose in oleaginous fungi, and it also lays a foundation for the genetic engineering of high-lipid strain.
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Funding
This work was supported by the Shandong Provincial Natural Science Foundation (ZR2020MC007), the National Natural Science Foundation of China (32101927), School-City integration project in Zhangdian District (2021JSCG0016).
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YZ was involved in the study conception, experimental design, data analysis, figures and tables’ arrangement, result interpretation, manuscript writing and review of the final draft. YY and SZ carried out the experiments and collected data. QL and WD participated in the experimental research. YS conceived the study and reviewed the original manuscript. All authors read and approved the final manuscript.
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Zhang, Y., Yang, Y., Zhang, S. et al. Lipid accumulation and SNF1 transcriptional analysis of Mucor circinelloides on xylose under nitrogen limitation. Antonie van Leeuwenhoek 116, 383–391 (2023). https://doi.org/10.1007/s10482-023-01810-7
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DOI: https://doi.org/10.1007/s10482-023-01810-7