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De novo RNA-sequencing and transcriptome analysis of Aconitum carmichaelii to analyze key genes involved in the biosynthesis of diterpene alkaloids

ABSTRACT: De novo RNA-sequencing and transcriptome analysis of Aconitum carmichaelii to analyze key genes involved in the biosynthesis of diterpene alkaloids

PROVIDER: PRJNA415989 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6225420_1.fastq.gz	Fastqsanger.gz
	SRR6225420_2.fastq.gz	Fastqsanger.gz
	SRR6225421_1.fastq.gz	Fastqsanger.gz
	SRR6225421_2.fastq.gz	Fastqsanger.gz
	SRR6225422_1.fastq.gz	Fastqsanger.gz

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Aconitum carmichaelii cultivar:Aconitum carmichaelii Debx

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De novo RNA-sequencing and transcriptome analysis of Aconitum carmichaelii to analyze key genes involved in the biosynthesis of diterpene alkaloids

Project description:In this study, we have performed Illumina based RNA sequencing to characterize the transcriptome and expression profiles of genes expressed in 4 tissues of A. carmichaelii. RNA sequencing and de novo transcriptome assembly fo A. carmichaelii resulted in a total of 128,183 unigenes with 56,928 unigenes being annotated using NCBI-nr database. Transcriptome profile and analysis for 4 tissues of A. carmichaelii showed that unigenes annotated as possible rate-determining steps of aconitine-type biosynthetic pathway were highly expressed in the root.

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De Novo RNA Sequencing and Expression Analysis of Aconitum carmichaelii to Analyze Key Genes Involved in the Biosynthesis of Diterpene Alkaloids.

Project description:Aconitum carmichaelii is an important medicinal herb used widely in China, Japan, India, Korea, and other Asian countries. While extensive research on the characterization of metabolic extracts of A. carmichaelii has shown accumulation of numerous bioactive metabolites including aconitine and aconitine-type diterpene alkaloids, its biosynthetic pathway remains largely unknown. Biosynthesis of these secondary metabolites is tightly controlled and mostly occurs in a tissue-specific manner; therefore, transcriptome analysis across multiple tissues is an attractive method to identify the molecular components involved for further functional characterization. In order to understand the biosynthesis of secondary metabolites, Illumina-based deep transcriptome profiling and analysis was performed for four tissues (flower, bud, leaf, and root) of A. carmichaelii, resulting in 5.5 Gbps clean RNA-seq reads assembled into 128,183 unigenes. Unigenes annotated as possible rate-determining steps of an aconitine-type biosynthetic pathway were highly expressed in the root, in accordance with previous reports describing the root as the accumulation site for these metabolites. We also identified 21 unigenes annotated as cytochrome P450s and highly expressed in roots, which represent candidate unigenes involved in the diversification of secondary metabolites. Comparative transcriptome analysis of A. carmichaelii with A. heterophyllum identified 20,232 orthogroups, representing 30,633 unigenes of A. carmichaelii, gene ontology enrichment analysis of which revealed essential biological process together with a secondary metabolic process to be highly enriched. Unigenes identified in this study are strong candidates for aconitine-type diterpene alkaloid biosynthesis, and will serve as useful resources for further validation studies.

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Functional identification of the terpene synthase family involved in diterpenoid alkaloids biosynthesis in Aconitum carmichaelii

Project description:Aconitum carmichaelii is a high-value medicinal herb widely used across China, Japan, and other Asian countries. Aconitine-type diterpene alkaloids (DAs) are the characteristic compounds in Aconitum. Although six transcriptomes, based on short-read next generation sequencing technology, have been reported from the Aconitum species, the terpene synthase (TPS) corresponding to DAs biosynthesis remains unidentified. We apply a combination of Pacbio isoform sequencing and RNA sequencing to provide a comprehensive view of the A. carmichaelii transcriptome. Nineteen TPSs and five alternative splicing isoforms belonging to TPS-b, TPS-c, and TPS-e/f subfamilies were identified. In vitro enzyme reaction analysis functional identified two sesqui-TPSs and twelve diTPSs. Seven of the TPS-c subfamily genes reacted with GGPP to produce the intermediate ent-copalyl diphosphate. Five AcKSLs separately reacted with ent-CPP to produce ent-kaurene, ent-atiserene, and ent-13-epi-sandaracopimaradie: a new diterpene found in Aconitum. AcTPSs gene expression in conjunction DAs content analysis in different tissues validated that ent-CPP is the sole precursor to all DAs biosynthesis, with AcKSL1, AcKSL2s and AcKSL3-1 responsible for C20 atisine and napelline type DAs biosynthesis, respectively. These data clarified the molecular basis for the C20-DAs biosynthetic pathway in A. carmichaelii and pave the way for further exploration of C19-DAs biosynthesis in the Aconitum species. Graphical abstract A Pacbio full-length transcriptome of Aconitum carmichaelii were publicly available. Twelve diterpene synthases were functional identified to responsible for atisine, napelline type diterpene alkaloids (DAs) and ent-13-epi-sandaracopimaradie biosynthesis, respectively.Image 1

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Structure, property, biogenesis, and activity of diterpenoid alkaloids containing a sulfonic acid group from <i>Aconitum carmichaelii</i>.

Project description:Three new C20-diterpenoid alkaloids with a sulfonic acid unit, named aconicarmisulfonines B and C (1 and 2) and chuanfusulfonine A (3), respectively, were isolated from the Aconitum carmichaelii lateral roots ("fu zi" in Chinese). Structures of 1-3 were determined by spectroscopic data analysis. Intriguing chemical properties and reactions were observed for the C20-diterpenoid alkaloids: (a) specific selective nucleophilic addition of the carbonyl (C-12) in 1 with CD3OD; (b) interconversion between 1 and 2 in D2O; (c) stereo- and/or regioselective deuterations of H-11α in 1-3 and both H-11α and H-11β in aconicarmisulfonine A (4); (d) TMSP-2,2,3,3-d 4 promoted cleavage of the C-12-C-13 bond of 4 in D2O; (e) dehydrogenation of 4 in pyridine-d 5, and (f) Na2SO3-assisted dehydrogenation and N-deethylation of songorine (5, a putative precursor of 1-4). Biogenetically, 1 and 2 are correlated with 4, for which the same novel carbon skeleton is proposed to be derived from semipinacol rearrangements via migrations of C-13-C-16 and C-15-C-16 bonds of the napelline-type skeleton, respectively. Meanwhile, 3 is a highly possible precursor or a concurrent product in the biosynthetic pathways of 1, 2, and 4. In the acetic acid-induced mice writhing assay, at 1.0 mg/kg (i.p.), compounds 1, 2, 5, 5a, and 5b exhibited analgesic effects against mice writhing.

| S-EPMC7606178 | biostudies-literature

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