Abstract
Objectives
To find extracellular biocatalysts that can specifically and efficiently remove the C-7 xylosyl group from 7-xylosyltaxanes.
Results
A Cellulosimicrobium cellulans strain F16 that can remove the C-7 xylosyl group from 7-xylosyltaxanes was isolated from the root soil of an old Taxus yunnanensis tree. Using corn cob as sole carbon source, the maximum 7-xylosyl-10-deacetylpaclitaxel β-xylosidase activity of 9.6 U l−1 was achieved. The β-xylosidase could be trapped by a ceramic tubular membrane (pore size 50 nm), and exhibited an apparent molecular weight much greater than 500 kDa. Under optimized conditions, 3.75 l cell-free culture medium transformed 2 grams 7-xylosyltaxane mixtures to their corresponding aglycones within 3 h, with a conversion >98 %.
Conclusion
This is the first report that C. cellulans can produce extracellular β-xylosidases capable of removing the C-7 xylosyl group from 7-xylosyltaxanes.
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Acknowledgments
This work was supported by the National High Technology Research and Development Program of China (863 Program) (No. 2009AA02Z205), the National Natural Science Foundation of China (No. 81102345) and the National Key Technology Research and Development Program of China (2009BADB9B02).
Conflict of interest
The authors declare that they have no conflict of interest.
Supporting information
Supplementary Figure 1 scanning electron microscopy results. a Grown on corn cob for 18 hours; b Grown on corn cob for 48 hours. Bar, 5 μm
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Tong-Yi Dou and Hong-Wei Luan have contributed equally to this work.
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Dou, TY., Luan, HW., Liu, XB. et al. Enzymatic hydrolysis of 7-xylosyltaxanes by an extracellular xylosidase from Cellulosimicrobium cellulans . Biotechnol Lett 37, 1905–1910 (2015). https://doi.org/10.1007/s10529-015-1867-4
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DOI: https://doi.org/10.1007/s10529-015-1867-4