Abstract
The ratio of carbon to nitrogen (C/N) in media plays a crucial role in the production of microbial carotenoids. However, the effects of a high C/N ratio on carotenoid production are ambiguous, and the mechanism of how C/N ratio affects astaxanthin accumulation in X. dendrorhous is unclear. In this study, the influence of C/N ratio on astaxanthin biosynthesis in X. dendrorhous at a fixed nitrogen concentration was investigated, and comparative proteomics were applied to address how C/N ratio affects cell growth and astaxanthin accumulation in X. dendrorhous. The results showed that cell growth and astaxanthin accumulation in X. dendrorhous were strongly related to the ratio of carbon to nitrogen with increasing C/N ratio in medium. However, the astaxanthin content per cell showed an inverse relationship, decreasing with an increasing C/N ratio. Differential proteomics showed the proteins with highest degree of change in expression under varying C/N ratios were mainly involved in carbohydrate metabolic pathways and carotenogenesis metabolism. In addition, several redox- and stress-associated proteins were up-regulated along with the carotenogenesis proteins, implying the environmental stress may affect metabolism and astaxanthin synthesis. A possible regulatory mechanism in response to glucose in X. dendrorhous is discussed.
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Acknowledgements
This study was funded by grants from the Science and Technology Program of Xiamen, China (No. 3502Z20153005) and from the Fundamental Research Funds for the Central Universities (No. 20720160077). We thank Oceanography and Environmental Science of Xiamen University for assistance with the MALDI-TOF MS–MS analysis.
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Pan, X., Wang, B., Gerken, H.G. et al. Proteomic analysis of astaxanthin biosynthesis in Xanthophyllomyces dendrorhous in response to low carbon levels. Bioprocess Biosyst Eng 40, 1091–1100 (2017). https://doi.org/10.1007/s00449-017-1771-5
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DOI: https://doi.org/10.1007/s00449-017-1771-5