Triterpene synthase of tripterygium wilfordii TwOSC1, encoding gene and application thereof

A coding and amino acid technology, applied in application, genetic engineering, plant genetic improvement, etc., can solve the problems of slow growth, low content, and restricted development of plants.

Active Publication Date: 2018-11-23
CAPITAL UNIVERSITY OF MEDICAL SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is a very potential way to develop new drugs from the active ingredients in traditional Chinese medicine. However, d...

Method used

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  • Triterpene synthase of tripterygium wilfordii TwOSC1, encoding gene and application thereof
  • Triterpene synthase of tripterygium wilfordii TwOSC1, encoding gene and application thereof
  • Triterpene synthase of tripterygium wilfordii TwOSC1, encoding gene and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1, the cloning of Tripterygium wilfordii Twosc1 full-length cDNA sequence

[0060] 1. Extraction of total RNA from tripterygium wilfordii suspension cells and first-strand cDNA acquisition

[0061] Using improved CTAB method (CTAB Buffer: 2% CTAB (W / V); 100mmol L -1 Tris-HCl (pH 8.0); 25mmol L -1 EDTA; 2.0mol L -1 NaCl; 0.5g L -1 spermidine) to extract the total RNA of Tripterygium wilfordii suspension cells. The obtained total RNA was used as a template, and the 5'-CDSprimer in the SMARTerTM RACE cDNA Amplification Kit was used to perform reverse transcription to obtain 5'-RACE-Ready cDNA.

[0062] 2. Primer Design

[0063] The full-length sequence fragment of the gene was screened according to the transcriptome data annotation of Tripterygium wilfordii, and Twosc1-F and Twosc1-R primers were designed. The primer sequences are as follows:

[0064] Twosc1-F: CAACAAAAATACATACATATCACCC (SEQ ID NO: 3)

[0065] Twosc1-R: AGCAAGCAAAATAGTTCTTACCT (SEQ ID NO:...

Embodiment 2

[0095] Embodiment 2, Twosc1 gene tissue expression analysis

[0096] 1. Handling of Experimental Materials

[0097] The roots, stems, leaves, and flowers of Tripterygium twig are collected from five different plants in the Yongan State-owned Forest Farm in Fujian. The samples were taken back to the laboratory for cleaning, quick-frozen in liquid nitrogen and stored in a minus 80 refrigerator.

[0098] 2. Extraction of total RNA and real-time quantitative PCR

[0099] The roots, stems, leaves, and flowers stored in the negative 80 refrigerator were crushed in a liquid nitrogen environment, and the total RNA was extracted by the improved CTAB method, and reverse-transcribed into cDNA with the FastQuant RT Kit (Tiangen). as an internal reference. Real-time quantitative PCR was performed using ABIPrism 7300 Sequence Detection System (Applied Biosystems, USA) and KAPA SYBR FASTUniversal 2X qPCR Master Mix (Kapa Biosystems, USA) kit. Real-time fluorescence quantitative reaction ...

Embodiment 3

[0105] Example 3, research on the biological function of Tripterygium wilfordii Twosc1

[0106] 1. Construction of eukaryotic expression vector

[0107] The vector pEASY-Blunt-Twosc1 plasmid containing the full-length cDNA of Tripterygium wilfordii Twosc1 gene was used as a template, and the gene coding region was amplified by PCR with primers containing restriction sites (marked with a horizontal line is the restriction site). DNA polymerase adopts high-fidelity DNA polymerase (Phusion High-Fidelity PCR Master Mix). The PCR parameters were 98°C for 30s, 1 cycle; 98°C for 10s, 60°C for 10s, 72°C for 2min 30s, 35 cycles; 72°C for 5min; 4°C for maintenance. The amplified product was recovered by Gene JET GelExtraction Kit gel (method as follows).

[0108] Twosc1-F:CGG GGTACC ATGTGGAAGCTCAAAGTT (SEQ ID NO: 9)

[0109] Twosc1-R:ATTT GCGGCCGC TCAATAGCCTTTGGATG (SEQ ID NO: 10)

[0110] Gene JET Gel Extraction Kit glue recovery step (with the glue recovery step in the impleme...

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Abstract

The invention relates to a triterpene synthase of tripterygium wilfordii TwOSC1 protein and an encoding gene thereof. A recombinant expression vector with a Twosc1 gene is constructed by cloning cDNAof the Twosc1 gene onto a eukaryotic expression vector pYES2, and then the recombinant expression vector is shifted to yeast expression host bacteria, so as to acquire some triterpenoids, such as friedelin and amyrin. A mutation research result shows that amino acids 486 and 502 encoded by the Twosc1 gene are key sites, and the yield of friedelin or amyrin can be increased or reduced; a gene gun mediated interference experiment shows that the interference of the Twosc1 gene has an obvious inhibiting effect on the synthesis of celastrol in the tripterygium wilfordii; through further experiments, a gene gun mediated overexpression experiment shows that the overexpression of the Twosc1 gene can increase the yield of the celastrol in tripterygium wilfordii suspension cells; the TwOSC1 proteinand the encoding gene thereof provided by the invention can be used for biosynthesizing plant triterpenoids and cultivating high-quality tripterygium wilfordii.

Description

technical field [0001] The invention relates to tripterygium wilfordii triterpene synthase and its encoding gene, and the application of the triterpene synthase and its encoding gene in the biosynthesis of triterpenoids, belonging to the field of medicinal plant genetic engineering. Background technique [0002] The traditional Chinese medicine Tripterygium wilfordii, derived from the xylem of the dried root of the medicinal plant Tripterygium wilfordii. Hook.f., is widely used in the treatment of rheumatoid arthritis and inflammation (Raphaela G M, Mildred W, Roy F, et al .Comparison of Tripterygium wilfordii Hook F Versus Sulfasalazine in the Treatment of Rheumatoid Arthritis:A Randomized Trial[J].Annals of Internal Medicine,2009,151(4):229-240.Tao X L,Lipsky P E.The Chinese anti-inflammatory and immunosuppressive herbal remedy Tripterygium wilfordii Hook F. [J]. Rheumatic Disease Clinics of North America, 2000, 26(1):29–50.). Terpenes are the main active ingredients of T...

Claims

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Application Information

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IPC IPC(8): C12N9/90C12N15/61C12N5/10C12P33/00
CPCC12N9/90C12P33/00C12Y504/99007
Inventor 高伟周家伟胡添源
Owner CAPITAL UNIVERSITY OF MEDICAL SCIENCES
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