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Pseudoringed leopard spider a family insecticidal gene and its encoded mature peptide and its application

A pseudo-ringed leopard spider, insecticidal gene technology, applied in the application, insecticide, genetic engineering and other directions, can solve problems such as the inability to meet the needs of insect resistance gene selection, achieve high insecticidal activity, optimize purification conditions, purity high effect

Active Publication Date: 2022-03-18
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, the existing research on spider toxins cannot meet the selection requirements of insect resistance genes

Method used

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  • Pseudoringed leopard spider a family insecticidal gene and its encoded mature peptide and its application
  • Pseudoringed leopard spider a family insecticidal gene and its encoded mature peptide and its application
  • Pseudoringed leopard spider a family insecticidal gene and its encoded mature peptide and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of toxin

[0042] Design and Construction of Spider Toxin Gene

[0043] The pseudoannulata spider was collected from the paddy field of Pukou District, Nanjing City, Jiangsu Province, and was reared indoors with brown planthoppers for 90 days. The venom glands were obtained and the transcriptome was sequenced. According to the number, arrangement, domain prediction and sequence analysis of cystine, a class of candidate genes for pseudoannular toxins were obtained, and one of them was selected, namely PPTX-02, whose base sequence was shown as SEQ ID NO. 1, the amino acid sequence of its encoded protein is shown in SEQ ID NO.6, its signal peptide, propeptide and mature peptide are predicted by SpiderP (http: / / www.arachnoserver.org / spiderP.html), and its mature peptide The sequence was codon-optimized according to the codon preference of Escherichia coli, and the PPTX-02 toxin gene sequence designed for expression in Escherichia coli is shown in SEQ ID NO.16. ...

Embodiment 2

[0053] Using the design and construction method of the spider toxin gene in Example 1, the insecticidal genes SEQ ID NO.2-5 of the pseudoringed leopard spider were prepared: PPTX-03b, PPTX-05, PPTX-06, PPTX-18; and The corresponding recombinant plasmids were constructed by the same method, induced and expressed in large quantities respectively, and recombinant toxins encoded by different genes were obtained after purification.

[0054] The nucleotide sequence of the insecticidal gene PPTX-02 of the pseudoringed leopard spider is SEQ ID NO.1, as follows:

[0055] atgaagtttgtagttctctttggtattctgttagtaactcttttcagttactcttcagctgatatgcttgatgatttcgaagaagcggatgaagctgatgtgctgttgtctttaatagatgaggcacccagagccaaggaatgtaccccaaggtttaacgactgttctcgagatcgccacagctgctgccgaagcgaactgttcaaagatgtctgcacatgcttttacccagaaagtggagacagtgaagtctgcacatgccaacagcccaagcatctgaagtacatggaaaaagccaccgacaaggttaaacaattcggcaaaaagttcggcggcaagcttaaaaaattgttcggt

[0056] The nucleotide sequence of the insecticidal gene PPTX-0...

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Abstract

The present invention discloses an insecticidal gene of the A family of pseudoannularia and its encoded mature peptide and its application. The nucleotide sequence of the insecticidal gene of the A family of pseudoannularia is shown in SEQ ID NO.1‑5 shown; the amino acid of the mature peptide encoded by the insecticidal gene of the pseudoringed leopard spider A family is shown in SEQ ID NO.11‑15. The present invention uses a bioinformatics analysis method to screen the genes in the quasi-annulata transcriptome database to obtain a class of similar candidate genes for quasi-annulatoxin, and construct the gene into a prokaryotic expression vector pET‑32a (+), the insecticidal peptide encoded by the gene can be obtained. As a new insecticidal gene resource, the insecticidal peptide has an insecticidal mechanism different from Bt toxin, and is useful for expanding new insecticidal gene resources with biological activity. It is of great scientific and practical significance to reduce various safety risks in the widespread use of existing Bt toxins and to reduce the use of pesticides.

Description

technical field [0001] The invention belongs to the field of genetic engineering and biological control, and relates to a class of insecticidal gene and its coded protein, in particular to an insecticidal gene of the A family of Pseudomonas annulus and its coded mature peptide and its application. Background technique [0002] At present, the insecticidal gene widely used in pest control is mainly the gene of Bacillus thuringiensis that produces Bt toxin. Bt toxin shows extremely high insecticidal specificity to agricultural pests such as Lepidoptera, Diptera and Coleoptera. Therefore, the Bt toxin gene is transgenic into important crops such as cotton, corn, and tobacco, which are widely planted. Transgenic crops carrying insect-resistant genes play an important role in agricultural pest control. However, long-term use of a single insect resistance gene has resulted in increasing resistance of pests to Bt toxins. A variety of insect populations have developed resistance t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K14/435C12N15/12A01N37/46A01P7/04
CPCA01N37/46C07K14/43518
Inventor 刘泽文黄立鑫于娜张懿熙王照英
Owner NANJING AGRICULTURAL UNIVERSITY
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