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Expression vector of membrane protein AmpG and expression and purification method of membrane protein AmpG

An expression vector, expression and purification technology, applied in the field of protein production, can solve the problems of difficult protein expression and resistance to drug-resistant bacteria, and achieve the effect of improving transcription and translation efficiency

Active Publication Date: 2021-07-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As a commonly used expression host, Escherichia coli has always been the first choice for protein expression. However, even E. coli proteins are difficult to express in large quantities in E. coli
At present, due to the abuse of antibiotics, it will be impossible to fight against drug-resistant bacteria in the next 50 years

Method used

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  • Expression vector of membrane protein AmpG and expression and purification method of membrane protein AmpG
  • Expression vector of membrane protein AmpG and expression and purification method of membrane protein AmpG
  • Expression vector of membrane protein AmpG and expression and purification method of membrane protein AmpG

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Embodiment 1

[0031] The gene cloning of embodiment 1AmpG

[0032] 1. Cloning of AmpG

[0033] a) Design a new AmpG coding sequence (SEQ ID NO.1) based on the codon usage frequency of Escherichia coli in the Kazusa online database (http: / / www.kazusa.or.jp / codon / ) compared to the codons used in the AmpG sequence , and synthesized. Then amplified by PCR method. The PCR reaction system configuration is shown in Table 1.

[0034] Table 1 PCR reaction system preparation table

[0035]

[0036]

[0037] PCR results such as figure 1 shown. The target fragment length is 1494bp, and the optimal annealing temperature is 52°C.

[0038] b) Recover the target DNA, digest the target fragment and pLy077 vector with NcoI and BamHI, and then perform agarose gel electrophoresis to recover the digested product; add the recovered target fragment and pLy077 vector fragment at a molar ratio of 5:1 In a small centrifuge tube, add T4 ligase and ligate overnight at 16°C.

[0039] c) 20 μL of the above...

Embodiment 2

[0042] The expression of embodiment 2AmpG

[0043] Induced Expression of Fusion Protein AmpG-Superfolded Fluorescent Protein

[0044] The correctly identified pLy077-AmpG plasmid was transferred into Escherichia coli expression host BL21 (DE3) and DH5α, and spread on the colony containing 0.1mM isopropylthiogalactopyranoside (IPTG) to obtain stable transformation; through the detection of colony fluorescence detection, Figure 5 In order to transform the colony fluorescence image on the agar plate, whether the colony contains a recombinant plasmid can be known from the presence or absence of fluorescence, and the colony containing the recombinant plasmid shows fluorescence, and it can be seen that a large number of mutants expressing the target protein have been obtained.

[0045]Inoculate a single colony into LB and TB liquid medium containing 100 μg / ml ampicillin, respectively, and culture overnight at 200 rpm at 37°C to obtain overnight bacteria. Inoculate the overnight b...

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Abstract

The invention discloses an expression vector of membrane protein AmpG and an expression and purification method of the membrane protein AmpG. The nucleotide sequence of the expression vector is shown as SEQ ID NO.2, and the expression vector comprises a phage T7 promoter; an escherichia coli ribosome binding site, which comprises an NcoI sequence CCATGG, an escherichia coli membrane protein AmpG sequence as shown in SEQ ID NO. 1, and a BamHI site GGATCC; a tobacco etch virus cysteine protease cleavage site GAGAACCTGTACTTCCAATCC; an NdeI enzyme cutting site CATATG; a super-folded Venus fluorescent protein coding sequence; an XhoI enzyme cutting site is CTCGAG; and 6 histidine sites and a termination codon TAG. According to the present invention, a fluorescent protein with molecular rigidity is used as a selection marker and an expression process indicator, and the fluorescent protein can be quickly folded due to a molecular level rigid structure, so as to help the nitrogen-terminal membrane protein AmpG stabilize the conformation of the nitrogen-terminal membrane protein AmpG. The expression vector constructed by the invention can realize mass expression of the membrane protein AmpG, and can be used for high-throughput screening of subsequent novel antibiotics.

Description

technical field [0001] The invention belongs to the technical field of protein production, and relates to an expression vector of membrane protein AmpG (Anhydromuropeptid permease) and an expression purification method thereof. Background technique [0002] The cell membrane is the boundary between the inside and outside of the cell, and is responsible for the important functions of information transmission, energy transmission and material exchange, and is the most important organelle. The target of drug action is often located on the cell membrane. More than 50% of known drug targets are membrane proteins. Therefore, the study of membrane proteins is of great significance. [0003] However, due to the rare content of membrane proteins in their natural state and their multiple transmembrane structures, folding errors are prone to occur and their structures are complex. Therefore, the large-scale preparation of membrane proteins has always been a difficulty and hot spot. ...

Claims

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Application Information

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IPC IPC(8): C12N15/70C12N15/65C12N15/62
CPCC12N15/70C12N15/65C07K14/245C12N2800/22C07K2319/35C07K2319/60Y02A50/30
Inventor 周敏张苑桢陈宇航卢颖洪
Owner NANJING UNIV OF SCI & TECH
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