Abstract
Key message
De novo transcriptome analysis from callus, leaf, and fruit of Trichosanthes cucumerina L. for the identification of genes associated with triterpenoid biosynthesis, especially bryonolic acid and cucurbitacin B.
Abstract
Trichosanthes cucumerina L. (TC) has been used as a medicinal plant in Thailand with various potential functions. Two major triterpenoids found in this plant, bryonolic acid and cucurbitacin B, are receiving increased attention for their activities. Here, we provide TC transcriptome data to identify genes involved in the triterpenoid biosynthetic pathway through callus, where was previously suggested as a novel source for bryonolic acid production as opposed to leaf and fruit. A de novo assembly of approximately 290-thousand transcripts generated from these tissues led to two putative oxidosqualene cyclases: isomultiflorenol synthase (IMS) and cucurbitadienol synthase (CBS). TcIMS and TcCBS, genes that encode substrates for two characteristic triterpenoids in cucurbitaceous plants, were identified as isomultiflorenol synthase and cucurbitadienol synthase, respectively. These two genes were functionally characterised in mutant yeast Gil77 systems, which led to the productions of isomultiflorenol and cucurbitadienol. Moreover, the callus-specific gene expression profiles were also presented. These obtained information showed candidate cytochrome P450s with predicted full-length sequences, which were most likely associated with triterpenoid biosynthesis, especially bryonolic acid. Our study provides useful information and a valuable reference for the further studies on cucurbitaceous triterpenoids.
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Abbreviations
- TC:
-
Trichosanthes cucumerina L.
- CN:
-
TC callus
- LN:
-
TC leaf
- FN:
-
TC fruit peel
- AACT:
-
Acetoacetyl-CoA thiolase
- HMGS:
-
Hydroxymethylglutaryl-CoA synthase
- HMGR:
-
Hydroxymethyl glutaryl-CoA reductase
- MVK:
-
Mevalonate kinase
- PMK:
-
Mevalonate-5-phosephate kinase
- MVD:
-
Mevalonate-5-diphosphate decarboxylase
- IDI:
-
Isopentenyldiphosphateisomerase
- DXS:
-
1-Deoxy-d-xylulose-5-phosphate synthase
- DXR:
-
1-Deoxy-d- xylulose-5-phosphate reductoisomerase
- CMS:
-
4-Diphosphocytidyl-2-C-methyl-d-erythritol synthase
- CMK:
-
4-Diphospho cytidyl-2-C-methyl-d-erythritol kinase
- MECS:
-
2-C-methyl-d-erythritol 2,4-cyclodiphosphate synthase
- HDS:
-
1-Hydroxy-2-methyl-2-butenyl 4- diphosphate synthase
- HDR:
-
1-Hydroxy-2-methyl-2-butenyl 4-diphosphate reductase
- OSC:
-
Oxidosqualene cyclase
- CYP:
-
Cytochrome P450
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Acknowledgements
This work was supported by grants from Young Researcher Development Program from National Research Council of Thailand and Mahidol Medical Scholars Program (MSP), Mahidol University, Thailand. We would like to thank Prof. Dr. Weena Jiratchariyakul, Faculty of Pharmacy, Mahidol University, Thailand, for providing the TC seeds and the cucurbitacin B and bryonolic acid standards.
Funding
This work was supported by Young Researcher Development Program from National Research Council of Thailand, Chulalongkorn University (GRU 6203023003-1), and Beijing Natural Science Foundation of China (No. JQ18027).
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Conceptualization: PL, SS, VS, and SB; Methodology: PL; Analysis: PL; Resources: MY, QX, SS, VN, and SB; Writing—original draft preparation: PL; Writing—review and editing: MY, QX, SS, VN, and SB; Funding acquisition: MY, QX, SS, and SB; Supervision: MY, QX, SS, VN, and SB.
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Lertphadungkit, P., Qiao, X., Sirikantaramas, S. et al. De novo transcriptome analysis and identification of candidate genes associated with triterpenoid biosynthesis in Trichosanthes cucumerina L.. Plant Cell Rep 40, 1845–1858 (2021). https://doi.org/10.1007/s00299-021-02748-8
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DOI: https://doi.org/10.1007/s00299-021-02748-8