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Recombinant alpha protein for inhibiting Clostridium perfringens infection and its preparation method and application

A technology for Clostridium perfringens and alpha protein, which is applied in the directions of antibacterial immunoglobulins, botanical equipment and methods, biochemical equipment and methods, etc., and can solve problems such as difficulty in increasing the renaturation rate.

Inactive Publication Date: 2020-01-14
CHINA ANIMAL DISEASE CONTROL CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Protein denaturation and renaturation is an extremely complicated process. The renaturation conditions of different proteins are different, and the renaturation rate is often difficult to improve.
This is the main constraint limiting its application

Method used

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  • Recombinant alpha protein for inhibiting Clostridium perfringens infection and its preparation method and application
  • Recombinant alpha protein for inhibiting Clostridium perfringens infection and its preparation method and application
  • Recombinant alpha protein for inhibiting Clostridium perfringens infection and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Example 1. Soluble expression of α-hisY

[0090] 1. Synthetic genes

[0091] The present application designed three kinds of recombinant α genes, namely α-hisY gene shown in SEQ ID No.1, α-hisW gene shown in SEQ ID No.3, and pmα-hisW gene shown in SEQ ID No.4.

[0092] Both the α-hisY gene and the α-hisW gene encode the protein α-his shown in SEQ ID No.2. The pmα-hisW gene encodes the protein pmα-hisW shown in SEQ ID No.5. α-his is a protein obtained by deleting amino acid residues 52-146 of pmα-hisW.

[0093] The α-Y gene shown in the 151-1062 of SEQ ID No.1 (the protein shown in the 51-353 amino acid residues of encoding SEQ ID No.2) is synthesized by chemical synthesis method, SEQ ID No. α-W gene shown in No. 151-1062 of 3 (the protein shown in No. 51-353 amino acid residues of coding SEQ ID No.2), pmα shown in No. 151-1347 of SEQ ID No.4 -W gene (encodes protein pmα-W represented by amino acid residues 51-448 of SEQ ID No.5).

[0094] 2. Construction of recombi...

Embodiment 2

[0114] Embodiment 2, animal immunoprotective test of α-his

[0115] 1. Preparation of anti-Clostridium perfringens vaccine

[0116] The α-his protein purified by molecular sieves in Example 1 was dissolved in sterile PBS to obtain an α-his solution with an α-his concentration of 1000 μg / mL for immunization. The α-his solution and Freund's adjuvant were mixed in an equal volume of 1:1, and emulsified to prepare an oil emulsion vaccine, which was named the first vaccine. The α-his solution and incomplete Freund's adjuvant were mixed in an equal volume of 1:1, and emulsified to prepare an oil emulsion vaccine, which was named the second-immunity vaccine.

[0117] Take out the A-type Clostridium perfringens virulent strain C57-10, the B-type Clostridium perfringens virulent strain C58-5, and the C-type Clostridium perfringens virulent strain purchased from the China Veterinary Drug Administration. Strain C59-4, Clostridium perfringens type D virulent strain C60-11. In the ultra...

Embodiment 3

[0140] Example 3, Optimization of α-his Induced Expression Conditions

[0141] 1. Optimization of induction temperature and time

[0142] Inoculate BL21(DE3) / pET30a-α-Y in LB liquid medium containing 50 μg / ml kanamycin (add kanamycin to LB liquid medium until the concentration of kanamycin is 50 μg / ml to obtain culture medium) at 37°C, using a ThermoMaxQ6000 full-temperature shaker at 200rpm to shake and cultivate to OD 600 When the value (the LB liquid medium containing 50 μg / ml kanamycin was used as the blank control) reached 0.6, isopropylthio-β-D-galactoside (IPTG) was added to induce the following six kinds of expression respectively. The first induced expression was induced with 0.75 mM IPTG for 1 hour at 37°C. The second induced expression was induced with 0.75 mM IPTG for 2 hours at 37°C. The third induced expression was induced with 0.75 mM IPTG for 4 hours at 37°C. The fourth induced expression was induced with 0.75 mM IPTG for 5 hours at 37°C. The fifth induced...

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Abstract

The invention discloses recombinant alpha protein for inhibiting clostridium perfringens infection and a preparation method and application thereof. The recombinant alpha protein is shown in (a) or (b) or (c), wherein the protein in (a) is composed of amino acid sequences shown as SEQ ID No.2; the protein in (b) is composed of amino acid sequences shown at the sites No.51-No.353 of SEQ ID No.2; the fusion protein in (c) is obtained by fusing protein tags at carboxyl terminals or / and amino terminals of the protein shown in (a) or (b). The recombinant alpha protein enables animals to have a higher serum antibody level and resist attack of clostridium perfringens after the animals are immunized with the recombinant alpha protein. The recombinant alpha protein is good in solubility and easy to purify and can serve as a diagnostic antigen to be prepared into a monoclonal antibody or be used for further research on protein functions and conformation relations.

Description

technical field [0001] The invention relates to a recombinant alpha protein for inhibiting Clostridium perfringens infection in the field of biotechnology, a preparation method and application thereof. Background technique [0002] Clostridium perfringens (Clostridium Perfringens), also known as Clostridium welchii, is an important zoonotic disease. The pathogen is traumatic gas gangrene and human food poisoning, as well as sheep blight, lamb dysentery, and necrosis of cattle and sheep. It is one of the main pathogens of acute enteritis and cattle and sheep enterotoxemia, which has caused huge economic losses to animal husbandry. The main pathogenic factor of Clostridium perfringens is the exotoxin secreted by it. There are as many as 13 types, among which α, β and ε are the most important exotoxins. According to the different types of exotoxins produced, the perfringens can be Clostridium mycobacterium is divided into five serotypes A, B, C, D, and E. The prevention and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K14/33C12N15/31C12N15/70C12N15/82C12N15/85A61K39/08A61P31/04G01N33/68G01N33/569C07K16/12
CPCA61K39/08C07K14/33C07K16/1282G01N33/569G01N33/68
Inventor 宋晓晖孙雨翟新验胡冬梅
Owner CHINA ANIMAL DISEASE CONTROL CENT
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