Abstract
Paclitaxel content in yew tree is extremely low, causing a worldwide shortage of this important anticancer drug. Yew tree can also produce abundant 7-β-xylosyl-10-deacetyltaxol that can be bio-converted into 10-deacetyltaxol for semi-synthesis of paclitaxel. However, the bio-conversion by the screened natural microorganisms was inefficient. We have constructed the recombinant yeast with a glycoside hydrolase gene from Lentinula edodes and explored the bioconversion. Based on previously established reaction conditions, the bioconversion of 7-β-xylosyl-10-deacetyltaxol or its extract was further optimized and scaled up with the engineered yeast harvested from 200-L scale high-cell-density fermentation. The optimization included the freeze-dried cell amount, dimethyl sulfoxide concentration, addition of 0.5 % antifoam supplement, and substrate concentration. A 93–95 % bioconversion and 83 % bioconversion of 10 and 15 g/L 7-β-xylosyltaxanes in 10 L reaction volume were achieved, respectively. The yield of 10-deacetyltaxol reached 10.58 g/L in 1 L volume with 15 g/L 7-β-xylosyl-10-deacetyltaxol. The conversion efficiencies were not only much higher than those of other reports and our previous work, but also realized in 10 L reaction volume. A pilot-scale product purification was also established. Our study bridges the gap between the basic research and commercial utilization of 7-β-xylosyl-10-deacetyltaxol for the industrial production of semi-synthetic paclitaxel.
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Acknowledgments
This work was supported by the National Natural Science Foundation (Grant Nos. 31270796; 30770229), the National Mega-project for Innovative Drugs (Grant No. 2012ZX09301002-001-005), and the Graduate Student Innovation Fund of Peking Union Medical College (Grant No. 2013-1007-02). The high-cell-density fermentation was performed in the Polo Biology Science Park Co., Ltd., China.
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Table S1 The impact of DMSO concentration on the bioconversion (reaction volume: 2 mL, n = 3, error value shows SD. For reaction conditions see the text) (DOCX 25 kb)
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Liu, WC., Zhu, P. Pilot studies on scale-up biocatalysis of 7-β-xylosyl-10-deacetyltaxol and its analogues by an engineered yeast. J Ind Microbiol Biotechnol 42, 867–876 (2015). https://doi.org/10.1007/s10295-015-1617-6
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DOI: https://doi.org/10.1007/s10295-015-1617-6