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Identification, molecular cloning and expression analysis of five RNA-dependent RNA polymerase genes in Salvia miltiorrhiza.

ABSTRACT: RNA-dependent RNA polymerases (RDRs) act as key components of the small RNA biogenesis pathways and play significant roles in post-transcriptional gene silencing (PTGS) and antiviral defense. However, there is no information about the RDR gene family in Salvia miltiorrhiza, an emerging model medicinal plant with great economic value. Through genome-wide predication and subsequent molecular cloning, five full-length S. miltiorrhiza RDR genes, termed SmRDR1-SmRDR5, were identified. The length of SmRDR cDNAs varies between 3,262 (SmRDR5) and 4,130 bp (SmRDR3). The intron number of SmRDR genes varies from 3 (SmRDR1, SmRDR3 and SmRDR4) to 17 (SmRDR5). All of the deduced SmRDR protein sequences contain the conserved RdRp domain. Moreover, SmRDR2 and SmRDR4 have an additional RRM domain. Based on the phylogenetic tree constructed with sixteen RDRs from Arabidopsis, rice and S. miltiorrhiza, plant RDRs may be divided into four groups (RDR1-RDR4). The RDR1 group contains an AtRDR and an OsRDR, while includes two SmRDRs. On the contrary, the RDR3 group contains three AtRDRs and two OsRDRs, but has only one SmRDR. SmRDRs were differentially expressed in flowers, leaves, stems and roots of S. miltiorrhiza and responsive to methyl jasmonate treatment and cucumber mosaic virus infection. The results suggest the involvement of RDRs in S. miltiorrhiza development and response to abiotic and biotic stresses. It provides a foundation for further studying the regulation and biological functions of SmRDRs and the biogenesis pathways of small RNAs in S. miltiorrhiza.

SUBMITTER: Shao F

PROVIDER: S-EPMC3986363 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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Identification, molecular cloning and expression analysis of five RNA-dependent RNA polymerase genes in Salvia miltiorrhiza.

Shao Fenjuan F Lu Shanfa S

PloS one 20140414 4

RNA-dependent RNA polymerases (RDRs) act as key components of the small RNA biogenesis pathways and play significant roles in post-transcriptional gene silencing (PTGS) and antiviral defense. However, there is no information about the RDR gene family in Salvia miltiorrhiza, an emerging model medicinal plant with great economic value. Through genome-wide predication and subsequent molecular cloning, five full-length S. miltiorrhiza RDR genes, termed SmRDR1-SmRDR5, were identified. The length of S ...[more]

PMID: 24733018

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Project description:Terpenoids are the largest class of plant secondary metabolites and have attracted widespread interest. Salvia miltiorrhiza, belonging to the largest and most widely distributed genus in the mint family, is a model medicinal plant with great economic and medicinal value. Diterpenoid tanshinones are the major lipophilic bioactive components in S. miltiorrhiza. Systematic analysis of genes involved in terpenoid biosynthesis has not been reported to date. Searching the recently available working draft of the S. miltiorrhiza genome, 40 terpenoid biosynthesis-related genes were identified, of which 27 are novel. These genes are members of 19 families, which encode all of the enzymes involved in the biosynthesis of the universal isoprene precursor isopentenyl diphosphate and its isomer dimethylallyl diphosphate, and two enzymes associated with the biosynthesis of labdane-related diterpenoids. Through a systematic analysis, it was found that 20 of the 40 genes could be involved in tanshinone biosynthesis. Using a comprehensive approach, the intron/exon structures and expression patterns of all identified genes and their responses to methyl jasmonate treatment were analysed. The conserved domains and phylogenetic relationships among the deduced S. miltiorrhiza proteins and their homologues isolated from other plant species were revealed. It was discovered that some of the key enzymes, such as 1-deoxy-D-xylulose 5-phosphate synthase, 4-hydroxy-3-methylbut-2-enyl diphosphate reductase, hydroxymethylglutaryl-CoA reductase, and geranylgeranyl diphosphate synthase, are encoded by multiple gene members with different expression patterns and subcellular localizations, and both homomeric and heteromeric geranyl diphosphate synthases exist in S. miltiorrhiza. The results suggest the complexity of terpenoid biosynthesis and the existence of metabolic channels for diverse terpenoids in S. miltiorrhiza and provide useful information for improving tanshinone production through genetic engineering.

Dataset Information

Identification, molecular cloning and expression analysis of five RNA-dependent RNA polymerase genes in Salvia miltiorrhiza.

Publications

Identification, molecular cloning and expression analysis of five RNA-dependent RNA polymerase genes in Salvia miltiorrhiza.

Similar Datasets

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