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Acetonic acid oxidase gene, recombinant expression plasmid and transformation strains thereof

A technology for pyruvate oxidase and expression plasmids, which is applied in the fields of oxidoreductase, genetic engineering, plant gene improvement, etc., can solve the problems of gene leakage expression downstream of Lac promoter, and achieve reduced fermentation cost, simplified culture conditions, effective Conducive to the effect of industrial production

Inactive Publication Date: 2008-05-14
SHANGHAI INST OF BIOLOGICAL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, RNA polymerase occasionally displaces the Lac repressor and successfully binds to the Lac promoter, resulting in leaky expression of genes downstream of the Lac promoter

Method used

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  • Acetonic acid oxidase gene, recombinant expression plasmid and transformation strains thereof
  • Acetonic acid oxidase gene, recombinant expression plasmid and transformation strains thereof
  • Acetonic acid oxidase gene, recombinant expression plasmid and transformation strains thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 , AvPyOD gene cloning

[0038] First design the following primer pairs:

[0039] Upstream: 5'-CATG CCATGG GAATGCATCACCATCACCATCATCACTCAGATAACAAAATTAACATC-3';

[0040] (Nco I restriction site)

[0041] (simultaneously add the nucleotide sequence corresponding to 9 amino acid residues MGMHHHHHH for purification)

[0042] Downstream: 5'-CGC GGATCC TTATCATTTGATGTATTTAGATTCTAAGCCTTCAGC-3';

[0043] (BamH I restriction site)

[0044] The AvPyOD gene was amplified by PCR using the genome of Aerococcus viridans ATCC10400 as a template and using the above primer pairs.

[0045] PCR system:

[0046] 5μl 10×PCR reaction buffer, 1μl downstream primer (50pM), 1μl downstream primer (50pM), 2μl Coccus viridans ATCC10400 genomic DNA (50ng / μl), 5μl dNTP mix (10mM, each 2.5mM), 0.5μl Pyrobest DNA polymerase (5U / μl), sterilized deionized water to 50μl.

[0047] PCR conditions:

[0048] 95°C for 5 minutes, then 30 cycles (each cycle condition is 95°C for 45 seconds,...

Embodiment 2

[0050] Example 2 , Construction of recombinant expression plasmid pSMLPyOD

[0051] The plasmid pSML104 used in this example was obtained according to the method in the literature (Li Y, et al. Eur. J. Biochem., 1999, 262: 713-719). This plasmid uses trc as a promoter and has its own expression element , the transcription terminator is rrnb, the replicon is p15a (middle copy), and contains a tetracycline (Tc) resistance gene.

[0052] The amplified product obtained in Example 1 was double-digested with restriction endonucleases Nco I and BamH I to obtain the AvPyOD gene with cohesive ends at both ends; pSML104 plasmid; then connect the two digested fragments, the connection conditions are: 2.5 μl 10×T4 DNA ligase buffer, 2U T4 DNA ligase, sterilized deionized water to 25 μl, 16 ° C ligation reaction for 16 hours; The product is the recombinant expression plasmid pSMLPyOD; the whole construction process is as follows: figure 1 shown.

[0053] In the recombinant expression ...

Embodiment 3

[0059] Example 3 , the acquisition of genetically engineered strain DH5α / pSMLPyOD

[0060] The recombinant expression plasmid pSMLPyOD was transformed into Escherichia coli DH5α (Dalian Bao Biological Company) {genetic characteristic is F - , supE44, ΔlacU169.φ80d / lacZΔM15, hsdR17, recA1, endA1, gyrA96, thi-1, relA1}, the obtained transformant DH5α / pSMLPyOD is as follows:

[0061] Take 1 μl of the recombinant expression plasmid pSMLPyOD, add it to 100 μl of Escherichia coli DH5α competent cells, bathe in ice for 20 minutes, bathe in water at 42°C for 90 seconds, and bathe in ice for 3 minutes, add LB medium (peptone 1%, yeast extract 0.5%, chlorine NaCl 1%) 900 μl, incubated at 37°C for 1 hour; then 100 μl was spread on a selective plate containing tetracycline (sodium pyruvate 10g peptone 10g, yeast extract 5g, sodium chloride 10g magnesium sulfate 0.5g horseradish over Oxidase 500U anisidine 10mg tetracycline 50mg agar powder 15g deionized water to 1000ml), incubate at 30...

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Abstract

The invention discloses a pyruvate oxidase gene (AvPyOD) derived from viridian aerococcus, recombinant expression plasmid constructed by the gene and an engineering strain of escherichia coli gene transformed by the recombinant expression plasmid. The AvPyOD gene has a nucleotide sequence illustrated in SEQ ID NO: 1 and is a brand-new gene. After the recombinant expression plasmid that contains the gene AvPyOD transforms into the escherichia coli gene, the engineering stain is obtained, the enzyme production ability of the engineering stain is greatly improved, thus being suitable for large-scale industrialized production of the pyruvate oxidase.

Description

technical field [0001] The invention belongs to the field of biotechnology, and in particular relates to a pyruvate oxidase gene AvPyOD derived from Aerococcus viridans ATCC10400, its recombinant expression plasmid, and Escherichia coli genetic engineering strain transformed with the recombinant expression plasmid. Background technique [0002] The discovered pyruvate oxidase can be divided into two categories. One type of pyruvate oxidase (EC.1.2.2.2) does not use oxygen molecules as direct acceptors during catalytic conversion and does not produce hydrogen peroxide. The catalytic reaction is: [0003] Pyruvate + ferrocytochrome b 1 +H 2 O = acetate + CO 2 + ferrocytochrome b 1 ; [0004] Escherichia coli pyruvate oxidase is a representative. [0005] Another type of pyruvate oxidase (EC.1.2.3.3) uses oxygen molecules as direct receptors to generate hydrogen peroxide, and the catalytic reaction is: [0006] Pyruvate + Phosphate + O 2 +H 2 O = acetyl phosphate + CO ...

Claims

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Application Information

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IPC IPC(8): C12N15/53C12N9/02C12N1/21C12R1/19
Inventor 赵辅昆陶家权庄英萍储炬袁中一
Owner SHANGHAI INST OF BIOLOGICAL SCI CHINESE ACAD OF SCI
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