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Method for constructing Ectoine producing strain

A technology for ectoine and production of bacteria, which is applied in the fields of metabolic engineering and genetic engineering, and can solve problems such as affecting the life of fermentation vessels.

Pending Publication Date: 2021-10-08
ZHEJIANG HUARUI BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, Ectoin is mainly prepared by fermentation of halophilic bacteria. High-salt fermentation not only affects the life of the fermentation vessel, but also poses a great challenge to the treatment of subsequent fermentation waste liquid.

Method used

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  • Method for constructing Ectoine producing strain
  • Method for constructing Ectoine producing strain
  • Method for constructing Ectoine producing strain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1: Genetic modification target plasmid construction

[0079] 1.1 Construction of plasmid pK18-Psod-lysC

[0080] Corynebacterium glutamicum ATCC13032 LysC fbr The genome was used as a template, and PCR amplification was performed with Psod-lysC-up-F / Psod-lysC-up-R and Psod-lysC-down-F / Psod-lysC-down-R primer pairs, respectively. PCR amplification conditions: 95°C for 5min; 30 cycles of 92°C for 30s, 58°C for 30s, 65°C for 35s; 65°C for 10min. The Psod-lysC-up and Psod-lysC-down fragments were amplified, both of which were 1k in length, and recovered by cutting the gel.

[0081] ATCC1303 LysC fbr The genome was used as a template, and Psod-lysC-F and Psod-lysC-R were used as primers to amplify to obtain a Psod-lysC fragment with a length of 200 bp, which was recovered by cutting the gel. Using Psod-lysC-up-F and Psod-lysC-down-R as primers, the three fragments of Psod-lysC-up, Psod-lysC-down, and Psod-lysC were subjected to overlap PCR, and the product was ge...

Embodiment 2

[0105] Embodiment 2: Construction of genetically engineered bacterial strains

[0106] 2.1 Pipette 3 μl (more than 500ng) of pK18-Psod-lysC plasmid into Corynebacterium glutamicum ATCC13032LysC fbr Competent cells were mixed and transferred to a 2 μm electroporation cup, and electric shock was performed at 2.5 kV for 5.3 ms. Immediately after electric shock, they were transferred to 800 μl 46°C preheated BHIS liquid medium, and incubated at 46 ℃ in a water bath for 6 minutes, and then placed in a constant temperature shaker at 30 ℃ and 220 rpm for 1 hour to revive the bacteria. After thawing, 100 μl of bacteria were spread on the BHIS plate containing kanamycin, and the plate was inverted and cultured in a constant temperature incubator at 30° C. for 48 hours. The transformant on the BHIS plate containing kanamycin was picked, inoculated into a non-resistant BHIS test tube medium, and cultured in a constant temperature shaker at 30° C. and 220 rpm for 24 hours to allow double...

Embodiment 3

[0110] Embodiment 3: the fermentation of engineering bacterium

[0111] 3.1 Shake flask fermentation: Streak the genetically engineered strains on the BHIS plate, incubator at 30°C for about 2 days, pick 2-3 single clones into the BHIS test tube; culture with shaking at 220rpm at 30°C for about 14 hours, transfer the seeds according to the ratio of 5v / v% Shake flasks, 30°C 220rpm shaking culture for about 10h; then 10v / v% inoculum amount was transferred to fermentation shaker flasks, 30°C 220rpm shaking culture for about 20h, samples were taken to detect the content of ectoine, and the fermentation results are shown in Table 2.

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Abstract

The invention discloses a method for constructing an Ectoine producing strain, the constructed genetically engineered strain CGMCC No.22733 can directly produce Ectoine through fermentation by taking glucose as a carbon source, 42.7 g / L of Ectoine can be produced through fermentation in a 5L fermentation tank for 48 hours, and the Ectoine producing strain has development and application potential.

Description

technical field [0001] The invention belongs to the fields of metabolic engineering and genetic engineering, and specifically relates to a method for constructing ectoine-producing bacteria, the constructed genetically engineered bacteria and applications thereof. Background technique [0002] Ectoin, the chemical name is 2-methyl-1,4,5,6,-tetrahydropyrimidine-4-carboxylic acid, also known as tetrahydromethylpyrimidine carboxylic acid, easily soluble in water and glycerin , propylene glycol, ethanol, etc. Molecule is C 6 h 10 o 2 N 2 , the structural formula is as follows: [0003] [0004] In 1985, Professor Galinski discovered in the Egyptian desert that halophilic bacteria would produce a natural protective component - ectoine, in the outer layer of cells under high temperature, dryness, strong UV radiation, and high salinity environment, which could make halophilic bacteria immune Injured, so as to repair itself; studies have shown that ectoine also has a good r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N15/77C12N15/90C12N15/54C12N15/60C12N15/53C12N15/52C12N1/21C12P17/12C12R1/15
CPCC12N15/77C12N15/902C12N15/52C12N9/1205C12N9/88C12N9/1217C12N9/0006C12N9/1022C12P17/12C12Y207/01039C12Y401/01032C12Y104/01001C12Y401/01038C12Y202/01001C12Y401/01049C12Y207/02004C12Y403/01023
Inventor 范文超刘映淼高书良杨海锋
Owner ZHEJIANG HUARUI BIOTECHNOLOGY CO LTD
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