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Construction and application of recombinant bacillus subtilis capable of synchronously secreting MTHase and MTSase

A technology of Bacillus subtilis and recombinant strains, applied in the fields of genetic engineering and fermentation engineering

Active Publication Date: 2020-06-02
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this study did not provide any information on the construction of recombinant Bacillus subtilis that uses the polypeptide pair spyCatcher / spyTag as a medium to construct synchronous secretion of MTHase ​​and MTSase and the formation of MTSase-MTHase ​​multi-enzyme complexes of different proportions and structures according to different assembly methods involved in the present invention. , improve the cascade catalytic efficiency of MTSase and MTHase

Method used

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  • Construction and application of recombinant bacillus subtilis capable of synchronously secreting MTHase and MTSase
  • Construction and application of recombinant bacillus subtilis capable of synchronously secreting MTHase and MTSase
  • Construction and application of recombinant bacillus subtilis capable of synchronously secreting MTHase and MTSase

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Experimental program
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Effect test

Embodiment 1

[0100] Construction of recombinant plasmids

[0101] 1. pDGI-7S6-P 43 -PhoD-MTSase-spyCatcher-6xHis plasmid construction

[0102] (1) Clone the promoter P 43 Gene fragment

[0103] Using the Bacillus subtilis genome as a template, design primers for PCR amplification of the promoter P 43 Gene fragment.

[0104] The promoter P 43 For PCR amplification of gene fragments, the nucleotide sequences of primers are as follows:

[0105] P 43 -1-F: aaaactggtctgatc ggatcc AGCTTCGTGCATGCAGGC SEQ ID NO. 1;

[0106] The underline is the BamHI restriction site;

[0107] P 43 - PhoD-2-R: GACTGTCGTATGCCATGTGTACATTCCTCTCTTA SEQ ID NO. 2;

[0108] The PCR reaction system is as follows:

[0109] 10 μmol / L upstream primer P 43 -1-F 2.5 μL, 10 μmol / L downstream primer P 43 -PhoD-2-R 2.5μL, gene template 2.5μL, 2×Phanta Max Master Mix 25μL, with ddH 2 O supplemented to 50 μL;

[0110] The above-mentioned PCR reaction is carried out according to the following procedures:

[0111] Pr...

Embodiment 2

[0220] Preparation of B. subtilis WB800n electroporation competent cells

[0221] Pick a single colony of B. subtilis WB800n on the surface of fresh LB solid medium and culture it for 12 hours in 5 mL LB liquid medium; take 1 mL of the 12-hour culture and insert it into 50 mL GM medium (GM medium: LB+0.5M sorbitol) Medium, cultured with shaking at 37°C to OD 600 is 1.0. Put the bacterial solution in an ice-water bath for 10 minutes, centrifuge at 5000 rpm at 4°C for 8 minutes, and collect the bacterial cells; resuspend the bacterial cells with 20 mL of pre-cooled ETM medium (ETM medium: 0.5M sorbitol+0.5M mannitol+10% glycerol), Centrifuge at 5000 rpm at 4°C for 8 min, remove the supernatant, and wash 3 times in this way; resuspend the washed bacteria in 500 μL of ETM medium, and distribute them in EP tubes, 60 μL per tube.

Embodiment 3

[0223] The recombinant plasmid prepared in embodiment 1 is transferred in the B.subtilis WB800n prepared in embodiment 2

[0224] 6 μL pDGI-7S6-P 43 -PhoD-MTSase-spyCatcher-6xHis plasmid was added to 60 μL of B.subtilis WB800n competent cells, incubated on ice for 5 minutes, added to a pre-cooled electroporation cup (2mm), and electroporated at 2500V and 5ms. After electroporation, Immediately add 1 mL of 37°C preheated RM medium (RM medium: LB+0.5M sorbitol+0.38M mannitol) to the electroporation cup, revive and culture at 37°C for 3 hours, and spread on the medium containing 100ug / mL spectinomycin On the LB plate, cultivate it upside down at 37°C, and screen the strains containing spectinomycin resistance as positive recombinant bacteria B.subtilis WB800n / P 43 -PhoD-MTSase-spyCatcher-6xHis. Transferring Spectinomycin Resistance Elimination Plasmid pTSC into Positive Recombinant B. subtilis WB800n / P 43 - In PhoD-MTSase-spyCatcher-6xHis, the transformant was spread on a 5ug / ...

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Abstract

The invention relates to construction and application of recombinant bacillus subtilis capable of synchronously secreting MTHase and MTSase. According to the construction and application disclosed bythe invention, self-assembly module plasmids pDGI-7S6-P43-PhoD-MTSase-spyCatcher-6xHis and plasmids pAX01-7S6-P43-PhoD-spyTag-linker-spyTag-MTHase-spyTag-6xHis are constructed; the constructed self-assembly module plasmids are transformed into B.subtilis WB800n thalli to obtain seamless integrative recombinant B.subtilis WB800n; and the recombinant strain is subjected to secretory expression and in vitro assembling of a MTSase-MTHase multienzyme complex body, and an experiment of dual-enzyme conversion for producing trehalose is performed, so that the conversion rate of the trehalose is increased to 81.5%.

Description

technical field [0001] The invention relates to the construction and application of a recombinant Bacillus subtilis that secretes MTHase ​​and MTSase simultaneously, and belongs to the technical field of genetic engineering and fermentation engineering. Background technique [0002] Trehalose (Trehalose) is a non-reducing disaccharide composed of two molecules of glucopyranose linked by 1,1-glycosidic bonds. It widely exists in bacteria, yeast, fungi, plants, animals and other organisms. [0003] Trehalose widely exists in nature and has special properties such as moderate sweetness, stable properties, not easy to decompose, and no reduction, as well as biological macromolecular protective agents. In particular, it has a non-specific protective effect on biological macromolecules, so it has great application potential in medicine, agriculture, cosmetics, food and other industries. Since the 1980s, research on the physiology, biochemistry and molecular biology of trehalose h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N15/75C12N15/54C12N15/56C12N1/21C12P19/14C12P19/12C12R1/125
CPCC12N9/1051C12N9/2402C12N15/75C12P19/14C12P19/12C12Y204/01245C12Y302/01028
Inventor 王腾飞宋龙祥刘洪玲
Owner QILU UNIV OF TECH
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