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Cecropin obtained from Aedes aegypti and its coding gene and application

An amino acid and protein technology, which is applied in application, genetic engineering, plant genetic improvement, etc., can solve the problem of limiting the growth of viruses or other pathogenic microorganisms, and achieve the effects of reducing infection, proliferation, and inhibition

Active Publication Date: 2017-09-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although mosquitoes can transmit viruses, they do not get sick themselves, indicating that the immune system in mosquitoes limits the growth of viruses or other pathogenic microorganisms

Method used

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  • Cecropin obtained from Aedes aegypti and its coding gene and application
  • Cecropin obtained from Aedes aegypti and its coding gene and application
  • Cecropin obtained from Aedes aegypti and its coding gene and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1, DENV-2 induces the expression of AaCECN gene in Aedes aegypti

[0038] 1. Group processing

[0039] Experimental group (24 Aedes aegypti): inoculate dengue type 2 virus to Aedes aegypti (each Aedes aegypti injects 10 MID through the chest cavity) 50 DENV-2, the injection volume is 300nL);

[0040] Control group (22 Aedes aegypti): Each Aedes aegypti was injected with 300 nL of PBS buffer through the chest cavity.

[0041] 2. After 6 hours of inoculation in step 1, the total RNA of Aedes aegypti was extracted and reverse-transcribed into cDNA, and the expression of AaCECN gene in Aedes aegypti was detected by fluorescent quantitative PCR (SYBR Green) (Actin gene was used as an internal reference).

[0042] The primers used to identify the AaCECN gene are as follows:

[0043] Upstream primer: 5'-CGGCAAGAAATTGGAAAAAGTC-3';

[0044] Downstream primer: 5'-GAATCGATCATCCTAGGGCC-3'.

[0045] The primers used to identify the Actin gene are as follows:

[0046] U...

Embodiment 2

[0049] Embodiment 2, the application of the substance that suppresses AaCECN gene expression in promoting dengue virus replication

[0050] 1. Preparation of dsRNA

[0051] 1. The primers designed to prepare the coding DNA of the dsRNA that inhibits AaCECN gene expression are as follows:

[0052] AaCECN-F: 5'- GCGCTCCGTCGATCAAGTTC-3';

[0053] AaCECN-R: 5'- CAGTGTCTTTTCACAATTTAAATCAG-3'.

[0054] In the above primers, the framed region is the T7 promoter sequence.

[0055] 2. Extracting the total RNA of Aedes aegypti and reverse-transcribing it into cDNA, using the cDNA as a template, performing PCR amplification with a primer pair composed of AaCECN-F and AaCECN-R to obtain a PCR amplification product.

[0056] 3. Get the PCR amplification product obtained in step 2, use the Ambion MEGAscriptT7High YieldTranscription Kit (catalogue number AM1334) and carry out in vitro transcription according to the kit instructions, since both AaCECN-F and AaCECN-R have a T7 promoter,...

Embodiment 3

[0081] Embodiment 3, the application of AaCECN protein in inhibiting virus replication

[0082] 1. Construction of recombinant plasmid pMT-AaCECN-V5-HisA

[0083] 1. Synthesize single-stranded DNA molecule A and single-stranded DNA molecule B respectively, and obtain double-stranded DNA molecules after annealing (in single-stranded DNA molecule A and single-stranded DNA molecule B, underline the part in the recognition sequence of the restriction endonuclease , in the resulting double-stranded DNA molecule, the upstream has the sticky end of the restriction endonuclease BglII, and the downstream has the sticky end of the restriction endonuclease XhoI).

[0084] Single-stranded DNA molecule A:

[0085] 5'- GATCT CAGCAACAGTGCGGCGTGGAAGCGGCGCCCAGGTGGAAATTCGGCAAGAAATTGGAAAAAGTCGG GAAAAATGTGTTTAACGCTGCTAAGAAGGCACTGCCAGTCGTTGCCGGGTACAAGGCCCTAGGA C -3'

[0086] Single-stranded DNA molecule B:

[0087] 5'- TCGAG TCCTAGGGCCTTGTACCCGGCAACGACTGGCAGTGCCTTCTTAGCAGCGTTAAACACATTTTTCC...

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Abstract

The present invention discloses Cecropins obtained from Aedes aegypti, a coding gene and applications thereof. According to the present invention, the protein of the present invention is the following (a) or (b) or (c): (a) the protein comprises amino acid residues at sites 20-62 from the N terminal in the sequence 1 in the sequence table, (b) the protein comprises an amino acid sequence represented by the sequence 1 in the sequence table, and (c) the protein is formed by carrying out substitution, and / or deletion and / or addition of one or a plurality of amino acids on the (a) or (b), has the antibacterial peptide function, and is derived from the (a) or (b); results of the present invention further prove that the dengue virus infection capability can be effectively reduced with the AaCECN protein; and the broad application prospects are provided.

Description

technical field [0001] The invention relates to cecropin obtained from Aedes aegypti, its coding gene and application. Background technique [0002] Cecropins (cecropins) is the earliest discovered insect antimicrobial peptides, in 1980, by Boman et al. isolated from silkworm pupae. This kind of polypeptide antibiotics generally contains 37-39 amino acid residues and does not contain cysteine. Its N-terminal region is strongly basic and can form a nearly perfect amphipathic helix structure, while the C-terminal region can form a hydrophobic helix. There is a hinge region formed by glycine and proline between them, and the C-termini of most polypeptides are amidated, and amidation plays an important role in their antibacterial activity. [0003] The mechanism of action of antimicrobial peptides can be divided into two types, that is, the mechanism of membrane structure destruction and the mechanism of non-membrane structure destruction. [0004] (1) Membrane structure destr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K14/435C07K19/00C12N15/12C12N15/62C12N15/85C12N5/10A61K38/17A61P31/14
CPCA61K38/00C07K14/43563C07K2319/00Y02A50/30
Inventor 程功肖小平
Owner TSINGHUA UNIV
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