Genetically engineered bacterium for expressing solubility pig gamma-interferonPoIFN-gamma and construction method and application of genetically engineered bacterium

A technology of genetically engineered bacteria and interferon, applied in the field of genetic engineering, can solve the problems of low expression level, inactive inclusion bodies in products, complicated and tedious preparation process, etc.

Active Publication Date: 2014-09-03
JIANGSU HFQ BIO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the defects of low expression of porcine gamma-interferon prepared by the above-mentioned prior art, the product is an inactive inclusion body, complex and cumbersome preparation process, etc., and proposes a genetically engineered bacterium expressing soluble porcine gamma-interferon and its construction method, and the efficient preparation method of porcine gamma-interferon by using the genetically engineered bacteria; by adopting self-induction medium to ferment and express porcine gamma-interferon, steps such as monitoring the cell density and adding IPTG inducer are omitted, making the operation Simple and easy to implement, while avoiding the toxic effect of IPTG on the bacteria

Method used

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  • Genetically engineered bacterium for expressing solubility pig gamma-interferonPoIFN-gamma and construction method and application of genetically engineered bacterium
  • Genetically engineered bacterium for expressing solubility pig gamma-interferonPoIFN-gamma and construction method and application of genetically engineered bacterium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Construction of genetically engineered bacteria expressing soluble porcine gamma-interferon

[0042] The first step: artificial synthesis of PoIFN-γ gene (SEQ ID NO.4)

[0043] Referring to the comprehensive factors such as Escherichia coli BL21 (DE3)'s preference for amino acid codons, base GC content, and mRNA secondary structure, the nucleotide sequence of natural porcine gamma-interferon is optimized. The amino acid sequence of gamma-interferon, and the porcine gamma-interferon mature peptide gene that can be expressed efficiently in Escherichia coli BL21 (DE3), its sequence (SEQ ID NO.1) is as follows:

[0044] CAGGCGCCGTTTTTTAAAGAAATTACCATTCTGAAAGATTATTTTAATGCGAGCACCAGCGATGTGCCGAATGGCGGCCCGCTGTTTCTGGAAATTCTGAAAAATTGGAAAGAAGAAAGCGATAAAAAAATTATTCAGAGCCAGATTGTGAGCTTTTATTTTAAATTTTTTGAAATTTTTAAAGATAATCAGGCGATTCAGCGCAGCATGGATGTGATTAAACAGGATATGTTTCAGCGCTTTCTGAATGGCAGCAGCGGCAAACTGAATGATTTTGAAAAACTGATTAAAATTCCGGTGGATAATCTGCAGATTCAGCGCAAAGCGATTAGCGAACTGATTAAAGTGAT...

Embodiment 2

[0050] Embodiment 2 prepares porcine gamma-interferon

[0051] The strain used in this example is: pET-32a(+)-PoIFN-γ / pTf16-P araB -tig / BL21(DE3) co-expressed genetically engineered bacteria.

[0052] The formulation of the self-inducing medium used in this example is: glycerol 0.5% (v / v), tryptone 1% (w / v), yeast extract 0.5% (w / v), lactose 0.2% (w / v ), glucose 0.05% (w / v), NaCl 0.5% (w / v), Na 2 HPO 4 50mM, KH 2 PO 4 50mM, (NH 4 ) 2 SO 4 25mM, MgSO 4 2mM.

[0053] The specific process of culture and fermentation is as follows: first, the preserved strain pET-32a(+)-PoIFN-γ / pTf16-P araB -tig / BL21(DE3) was inoculated on the LB plate containing ampicillin and chloramphenicol, cultured overnight at 37°C, and then a single colony was picked from the plate and inoculated on an autoinduced plate containing ampicillin and chloramphenicol. In the culture medium, culture at 27° C. and 210 rpm for 18 hours, and collect the cells by centrifugation.

[0054] Preparation of porci...

Embodiment 3

[0064] Embodiment 3 comprises the preparation of the composition of porcine gamma-interferon

[0065] To prepare 0.9% (w / v) NaCl solution, take 1 mg of purified porcine gamma-interferon PoIFN-γ and dissolve it in 0.5 ml of NaCl solution; take another 50 mg of mannitol and dissolve it in 0.5 ml of NaCl solution; Composition of porcine γ-interferon PoIFN-γ and mannitol, which contains 1 mg / ml of PoIFN-γ and 50 mg / ml of mannitol.

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Abstract

The invention belongs to the technical field of genetic engineering, and specifically discloses a genetic engineering bacterium expressing soluble porcine γ-interferon PoIFN-γ, a construction method and application thereof. The genetically engineered bacterium expressing soluble porcine gamma-interferon PoIFN-γ of the present invention is Escherichia coli BL21(DE3) carrying recombinant plasmid pET-32a(+)-PoIFN-γ and plasmid pTf16-ParaB-tig at the same time. Wherein, the PoIFN-γ gene sequence in the recombinant plasmid pET-32a(+)-PoIFN-γ is SEQ ID NO.4; the plasmid pTf16-ParaB-tig can express the molecular chaperone tig. The method of the invention improves the solubility and yield of porcine gamma-interferon, has simple process and low cost, and has good industrial application value.

Description

technical field [0001] The invention belongs to the technical field of genetic engineering, and in particular relates to a genetically engineered bacterium expressing soluble porcine gamma-interferon PoIFN-γ, its construction method and application. Background technique [0002] Porcine γ-interferon (porcine interferongamma, PoIFN-γ), also known as porcine type II interferon, is a type of cytokine secreted by activated T lymphocytes, macrophages and NK cells, and has antiviral, antitumor, and activating functions of lymphocytes and immune regulation. In practical applications, porcine interferon is used as a vaccine adjuvant and used in combination with vaccines for treating different diseases to develop a new type of vaccine with better immune effect, which has a positive impact on the prevention and treatment of pig diseases. [0003] At present, the mass production of porcine interferon mainly includes cell induction culture method and gene recombination method using Pic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/21C12N15/66C12N15/63C12P21/02A61K38/21A61P31/12C12R1/19
Inventor 龙谭汪正华吴自荣郗洪生王滨坤
Owner JIANGSU HFQ BIO TECH CO LTD
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