Abstract
Addition of exogenous astaxanthin for improving ε-poly-l-lysine (ε-PL) production in Streptomyces griseofuscus was investigated in this study. By this unique strategy, the ε-PL production in shaker-flask fermentation was 2.48 g/L, which was 67.5% higher than the control at the addition dosage of 1.0 g/L, owing to the oxidation resistance of astaxanthin. In fed-batch fermentation, the ε-PL production reached 36.1 g/L, a 36.3% increase compared to the control. Intracellular response for oxidation in S. griseofuscus such as ROS generation and lipid peroxidation was reduced by astaxanthin addition. Illumina RNA deep sequencing (RNA-seq) technology further revealed that S. griseofuscus with astaxanthin addition showed down-regulated transcriptions of genes involved in oxidative stress. This research proved that the beneficial effect of astaxanthin addition was far better than glutathione (GSH) owing to the stronger antioxidant capacity, and provided a novel approach to regulate ε-PL synthesis.
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This work was financially supported by Shandong Natural Science Foundation (ZR2019BC044).
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Li, S., Ji, J., Hu, S. et al. Enhancement of ε-poly-l-lysine production in Streptomyces griseofuscus by addition of exogenous astaxanthin. Bioprocess Biosyst Eng 43, 1813–1821 (2020). https://doi.org/10.1007/s00449-020-02372-y
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DOI: https://doi.org/10.1007/s00449-020-02372-y