Abstract
Main conclusion
Four types of cells were engineered from Artemisia annua to produce approximately 17 anthocyanins, four of which were elucidated structurally. All of them expressed the artemisinin pathway.
Abstract
Artemisia annua is the only medicinal crop to produce artemisinin for the treatment of malignant malaria. Unfortunately, hundreds of thousands of people still lose their life every year due to the lack of sufficient artemisinin. Artemisinin is considered to result from the spontaneous autoxidation of dihydroartemisinic acid in the presence of reactive oxygen species (ROS) in an oxidative condition of glandular trichomes (GTs); however, whether increasing antioxidative compounds can inhibit artemisinin biosynthesis in plant cells is unknown. Anthocyanins are potent antioxidants that can remove ROS in plant cells. To date, no anthocyanins have been structurally elucidated from A. annua. In this study, we had two goals: (1) to engineer anthocyanins in A. annua cells and (2) to understand the artemisinin biosynthesis in anthocyanin-producing cells. Arabidopsis Production of Anthocyanin Pigment 1 was used to engineer four types of transgenic anthocyanin-producing A. annua (TAPA1–4) cells. Three wild-type cell types were developed as controls. TAPA1 cells produced the highest contents of total anthocyanins. LC–MS analysis detected 17 anthocyanin or anthocyanidin compounds. Crystallization, LC/MS/MS, and NMR analyses identified cyanidin, pelargonidin, one cyanin, and one pelargonin. An integrative analysis characterized that four types of TAPA cells expressed the artemisinin pathway and TAPA1 cells produced the highest artemisinin and artemisinic acid. The contents of arteannuin B were similar in seven cell types. These data showed that the engineering of anthocyanins does not eliminate the biosynthesis of artemisinin in cells. These data allow us to propose a new hypothesis that enzymes catalyze the formation of artemisinin from dihydroartemisinic acid in non-GT cells. These findings show a new platform to increase artemisinin production via non-GT cells of A. annua.
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Data availability
All data that support our findings reported in this study are available in the supplementary materials of this article.
Abbreviations
- ACT:
-
Artemisinin-based combination therapy
- DHAA:
-
Dihydroartemisinic acid
- GT:
-
Glandular trichome
- HPLC–ESI-QTOF–MS:
-
High-performance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight mass spectrometry
- NMR:
-
Nuclear magnetic resonance
- PAP1:
-
Production of anthocyanin pigmentation 1
- qRT-PCR:
-
Quantitative reverse transcription-polymerase chain reaction
- TAPA:
-
Transgenic anthocyanin-producing Artemisia annua calli
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Acknowledgements
We thank College of Agriculture and Life Sciences Dean’s Graduate Research Assistantship and US Department of Education GAANN Biotechnology Fellowship, NC State University for supporting Rika Judd’s PhD study. We thank China Scholar Council for supporting Yilun Dong’s PhD Exchange Scholarship.
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Judd, R., Dong, Y., Sun, X. et al. Metabolic engineering of the anthocyanin biosynthetic pathway in Artemisia annua and relation to the expression of the artemisinin biosynthetic pathway. Planta 257, 63 (2023). https://doi.org/10.1007/s00425-023-04091-6
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DOI: https://doi.org/10.1007/s00425-023-04091-6