Abstract
Rapamycin is a clinically important macrocyclic polyketide with immunosuppressive activity produced by Streptomyces hygroscopicus. To rationally guide the improvement of rapamycin production, comparative metabolic profiling analysis was performed in this work to investigate the intracellular metabolic changes in S. hygroscopicus U1-6E7 fermentation in medium M1 and derived medium M2. A correlation between the metabolic profiles and rapamycin accumulation was revealed by partial least-squares to latent structures analysis, and 16 key metabolites that most contributed to the metabolism differences and rapamycin production were identified. Most of these metabolites were involved in tricarboxylic acid cycle, fatty acids, and shikimic acid and amino acids metabolism. Based on the analysis of key metabolites changes in the above pathways, corresponding exogenous addition strategies were proposed as follows: 1.0 g/L methyl oleate was added at 0 h; 1.0 g/L lysine was added at 12 h; 0.5 g/L shikimic acid was added at 24 h; 0.5 g/L sodium succinate, 0.1 g/L phenylalanine, 0.1 g/L tryptophan, and 0.1 g/L tyrosine were added at 36 h, successively, and a redesigned fermentation medium (M3) was obtained finally on the basis of M2. The production of rapamycin in M3 was increased by 56.6 % compared with it in M2, reaching 307 mg/L at the end of fermentation (120 h). These results demonstrated that metabolic profiling analysis was a successful method applied in the rational guidance of the production improvement of rapamycin, as well as other industrially or clinically important compounds.
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Acknowledgments
This work was financially supported by the National 973 Project of China (No. 2013CB733600), the Key Program of National Natural Science Foundation of China (No. 21236005), National Natural Science Foundation of China (No. 21176181), and the Program of Introducing Talents of Discipline to Universities (No. B06006).
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Zhao, S., Huang, D., Qi, H. et al. Comparative metabolic profiling-based improvement of rapamycin production by Streptomyces hygroscopicus . Appl Microbiol Biotechnol 97, 5329–5341 (2013). https://doi.org/10.1007/s00253-013-4852-7
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DOI: https://doi.org/10.1007/s00253-013-4852-7