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Production of the anticancer drug taxol by the endophytic fungus Epicoccum nigrum TXB502: enhanced production by gamma irradiation mutagenesis and immobilization technique

  • Biotechnological products and process engineering
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Abstract

Taxol, a phyto-extracted diterpenoid, is the most commercially needed drug in cancer chemotherapy. In spite of the microbial production of taxol being successful and prospective, the reported yields are still not sufficient for large-scale production. Thus, the discovery of new taxol-producing microbial strains and production enhancement methodologies such as process optimization, strain improvement, and immobilization technique are the main objectives. In this paper, a taxol-producing start strain Epicoccum nigrum TXB502 (initial yield 61.35 μg L−1) was isolated from Taxus baccata and identified by morphological and molecular tools. The optimum cultivation and nutritional conditions were assessed by testing one parameter at a time approach that resulted in 88.59% significant production increase. In addition, a stable mutant with improved productivity (40.07% yield increase in comparison with the parent strain) was successfully developed after gamma irradiation mutagenesis of the start strain. The taxol titer was further improved via testing different immobilization carriers for both spores and mycelia of this mutant. Over taxol production was achieved using alginate-immobilized mycelia with the feasibility of conducting six successive production cycles in a semi-continuous form. The final total concentration reached 8187.77 μg taxol 6 L−1 which represents approximately 22-fold increase, as compared to the initial titer of the start strain. These findings can pave the way for the prospective industrial manufacturing of taxol, as the achieved taxol production in this study is the highest reported by academic laboratories for microbial cultures.

Key points

• Discovery of a new taxol-producing endophytic fungus E. nigrum TXB502 strain.

• Taxol yield was successfully improved via bioprocess optimization and strain mutagenesis.

• Alginate-immobilized mycelia were efficient for a semi-continuous production of taxol.

• The final total concentration of taxol showed approximately 22-fold increase as compared to the initial titer.

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Authors and Affiliations

  1. Plant Research Department, Nuclear Research Center, Atomic Energy Authority, Cairo, Egypt

    El-Sayed R. El-Sayed, Amira G. Zaki & Ashraf S. Ahmed

  2. Department of Botany and Microbiology, Faculty of Science, Zagazig University, Zagazig, Egypt

    Ahmed A. Ismaiel

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  1. El-Sayed R. El-Sayed
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  2. Amira G. Zaki
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  3. Ashraf S. Ahmed
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  4. Ahmed A. Ismaiel
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Contributions

ERE suggested the research point, designed the experimental methodology, conducted experiments, analyzed the obtained data, wrote the original draft, and participated in the manuscript writing and revision. AGZ conducted experiments, wrote the original draft, and participated in manuscript revision and editing. ASA and AAI participated in revising and editing the manuscript.

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Correspondence to El-Sayed R. El-Sayed.

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El-Sayed, ES.R., Zaki, A.G., Ahmed, A.S. et al. Production of the anticancer drug taxol by the endophytic fungus Epicoccum nigrum TXB502: enhanced production by gamma irradiation mutagenesis and immobilization technique. Appl Microbiol Biotechnol 104, 6991–7003 (2020). https://doi.org/10.1007/s00253-020-10712-x

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