Abstract
Main conclusion
We identify two ferruginol synthases and a 11-hydroxyferruginol synthase from a traditional Chinese medicinal herb Isodon lophanthoides and propose their involvement in two independent abietane diterpenoids biosynthetic pathways.
Abstract
Isodon lophanthoides is a traditional Chinese medicinal herb rich in highly oxidized abietane-type diterpenoids. These compounds exhibit a wide range of pharmaceutical activities, yet the biosynthesis is barely known. Here, we describe the screening and functional characterization of P450s that oxidize the abietane skeleton abietatriene. We mainly focused on CYP76 family and identified 12 CYP76AHs by mining the RNA-seq data of I. lophanthoides. Among the 12 CYP76AHs, 6 exhibited similar transcriptional expression features as upstream diterpene synthases, including root or leaf-preferential expression pattern and highly MeJA inducibility. These six P450s were considered as first-tier candidates and functionally characterized in yeast and plant cells. In yeast assays showed that both CYP76AH42 and CYP76AH43 were ferruginol synthases hydroxylating the C12 position of abietatriene, whereas CYP76AH46 was characterized as a 11-hydroxyferruginol synthase which catalyzes two successive oxidations at C12 and C11 of abietatriene. Heterologous expression of three CYP76AHs in Nicotiana benthamiana resulted in the formation of ferruginol. qPCR analysis showed CYP76AH42 and CYP76AH43 were mainly expressed in the root, which was consistent with the distribution of ferruginol in the root periderms. CYP76AH46 was primarily expressed in the leaves where barely ferruginol or 11-hydroxyferruginol was detected. In addition to distinct organ-specific expression pattern, three CYP76AHs exhibited different genomic structures (w or w/o introns), low protein sequence identities (51–63%) and were placed in separate subclades in the phylogenetic tree. These results suggest that the identified CYP76AHs may be involved in at least two independent abietane biosynthetic pathways in the aerial and underground parts of I. lophanthoides.
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Data availability
The nucleotide sequences reported in this study have been deposited in the NCBI GenBankTM/EBI Data Bank with accession numbers: CYP76AH41, OP891584; CYP76AH42, OP891585; CYP76AH43, OP891586; CYP76AH44, OP891587; CYP76AH45, OP891588; CYP76AH46, OP891589; CYP76AH47, OP891590; CYP76AH48, OP891591; CYP76AH49, OP891592; CYP76AH50, OP891593; CYP76AH51, OP891594; CYP76AH52, OP891595.
Abbreviations
- diTPS:
-
Diterpene synthase
- (+)-CPS:
-
(+)-Copalyl diphosphate synthase
- P450:
-
Cytochrome P450
- MeJA:
-
Methyl jasmonate
- GC–MS:
-
Gas chromatography–mass spectrometry
- GGPP:
-
Geranylgeranyl diphosphate
- GGOH:
-
Geranylgeraniol
- TIC:
-
Total ion chromatogram
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Acknowledgements
Financial assistance was provided by the National Science Foundation of Distinguished Young Scholars of China (Grant No. 31900250).
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LH: designed the project; ZD, ZP, HY and HW: performed the experiments; JS: constructed the YS101 strain; LH: wrote the article. All the authors read and approved the manuscript.
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Du, Z., Peng, Z., Yang, H. et al. Identification and functional characterization of three cytochrome P450 genes for the abietane diterpenoid biosynthesis in Isodon lophanthoides. Planta 257, 90 (2023). https://doi.org/10.1007/s00425-023-04125-z
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DOI: https://doi.org/10.1007/s00425-023-04125-z