Abstract
Huperzine A (HupA), a naturally occurring lycopodium alkaloid, is a potent, highly specific and reversible inhibitor of acetylcholinesterase and is a potential treatment for Alzheimer’s disease. However, isolating HupA from Huperziaceae plants is inefficient; thus, extracting this compound from endophytic fungi may be more controllable and sustainable. However, the large-scale production of this chemical from endophytes is limited by the innate instability of endophytic fungi. In this study, we maintained the stability and viability of the HupA-producing endophytic fungus Shiraia sp. Slf14 and enhanced the HupA titers during fermentation by adding Huperzia serrata extracts (HSE), l-lysine, and acetic acid into the culture as inducers. Adding trace amounts of HupA clearly improved the HupA production of Shiraia sp. Slf14, reaching a maximum content of approximately 40 μg g−1. Moreover, the addition of HSE and l-lysine promoted HupA production in the flask fermentation. The aforementioned bioprocessing strategy may be potentially applied to other endophytic fungal culture systems for the efficient production of plant secondary metabolites.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 31300051, 21066014 and 81260617), China Postdoctoral Science Foundation (2012M511454), Jiangxi Natural Science Foundation of China (20114BAB204020), and Major Science and Technology Subject of Jiangxi Province (2010AZD00307). We appreciate the help of Prof. Lehua Zhang from the Lushan Botanical Garden of China for providing the plant materials. We are also grateful for the constructive comments of anonymous reviewers.
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Yan, R., Zhang, Z., Wang, Y. et al. Efficient strategy for maintaining and enhancing the huperzine A production of Shiraia sp. Slf14 through inducer elicitation. J Ind Microbiol Biotechnol 41, 1175–1179 (2014). https://doi.org/10.1007/s10295-014-1461-0
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DOI: https://doi.org/10.1007/s10295-014-1461-0