Abstract
Taxus chinensis suspension cells were transformed by the Agrobacterium-mediated transformation method to overexpress the dbat gene coding for 10-deacetylbaccatin III-10 β-O-acetyltransferase, a key enzyme for taxol biosynthesis. A. tumefaciens strain LBA4404 harboring either pCAMBIA1303 or the recombinant plasmid p1303-SdbatN was used. Both plasmids harbored the hygromycin phosphotransferase gene (hptII) and gusA-mgfp5 gene as selectable markers, but the latter plasmid also harbored the dbat gene in the T-DNA region. The transgenic T. chinensis cells had been maintained in modified Gamborg’s B5 medium supplemented with hygromycin for more than 14 months and were subcultured at 4-week intervals. The selected transgenic cells were identified by PCR, Southern blot analysis, β-glucuronidase assay and western blot analysis, and the results showed that the transgenes were integrated in the chromosomal DNA of T. chinensis cells with single-copy style, and that the gusA-mgfp5 reporter gene was expressed in the transgenic cells. The dbat mRNA expression level in the p1303-SdbatN-transgenic T. chinensis cells tested by real-time quantitative PCR was 5.3 ± 0.6 times that of the non-transformed cells. Taxol yield of the p1303-SdbatN-transgenic T. chinensis cells was about 1.7 times that of the non-transformed cells. These results suggest that the overexpression of dbat gene in transgenic T. chinensis cells leads to increased taxol yield.
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Abbreviations
- CaMV:
-
Cauliflower mosaic virus
- NOS:
-
Nopaline synthase
- GUS:
-
β-glucuronidase
- MeJ:
-
Methyl jasmonate
- dbat :
-
10-deacetylbaccatin III-10 β-O-acetyltransferase gene
- hptII :
-
Hygromycin phosphotransferase gene
- DW:
-
Dry weight
- T-DNA:
-
Transfer DNA
- PCR:
-
Polymerase chain reaction
- HPLC:
-
High performance liquid chromatography
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Acknowledgements
This research work was supported by a National Natural Science Foundation of China (grant number 20776058), a New Century Talents Support Program by the Ministry of Education of China in 2006, and a National “11th Five-Year Plan” to Support Science and Technology Project of China (2008BAI63B04). The authors would like to thank Dr Gu Xiao-man and Dr Cheng Hong of the Analytical and Testing Center in Huazhong University of Science and Technology for HPLC–MS analysis.
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Peng Zhang and Shu-Tao Li contributed equally to this work.
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Zhang, P., Li, ST., Liu, TT. et al. Overexpression of a 10-deacetylbaccatin III-10 β-O-acetyltransferase gene leads to increased taxol yield in cells of Taxus chinensis . Plant Cell Tiss Organ Cult 106, 63–70 (2011). https://doi.org/10.1007/s11240-010-9894-2
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DOI: https://doi.org/10.1007/s11240-010-9894-2