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CN109628479A - A kind of recombinant expression method of glucagon-like-peptide-1 - Google Patents

A kind of recombinant expression method of glucagon-like-peptide-1 Download PDF

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CN109628479A
CN109628479A CN201811587926.XA CN201811587926A CN109628479A CN 109628479 A CN109628479 A CN 109628479A CN 201811587926 A CN201811587926 A CN 201811587926A CN 109628479 A CN109628479 A CN 109628479A
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sumo
rolglp
fusion
fusion gene
gene
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张耀方
王英超
李涛
李天俊
许艳玲
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Tianjin Agricultural University
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Abstract

A kind of recombinant expression method of glucagon-like-peptide-1 includes the following steps the fusion SUMO-rolGLP-1 for 1) constructing a kind of DNA sequence dna containing coding small ubiquitin-related modifier proteins and the DNA sequence dna for encoding Gluca Gen sample polypeptide -1;2) colibacillus engineering of a kind of coli expression carrier including fusion SUMO-rolGLP-1 and high expression fusion SUMO-rolGLP-1 is constructed;3) inducing expression is carried out to colibacillus engineering strain, obtains fusion protein;4) fusion protein is isolated and purified using nickel-Ago-Gel;5) albumen by step 4) purifying uses protease digestion, obtains the mixture of SUMO and rolGLP-1 albumen;6) after the mixture that step 5) obtains is using Ni-FF absorption SUMO albumen, rolGLP-1 albumen is collected by centrifugation in super filter tube.

Description

A kind of recombinant expression method of glucagon-like-peptide-1
Technical field
The present invention relates to the recombinant expression methods of glucagon-like-peptide-1.
Background technique
According to the pathogenesis of diabetes, three types can be largely divided into: type 1 diabetes --- also known as insulin according to Relying property diabetes, diabetes B --- also known as adult-onset diabetes, gestational diabetes mellitus, wherein diabetes B is most normal See, accounts for about the ninety percent of whole diabetics.
In the enteron aisle of mammal, there is the pancreas hyperglycemia of about 3kD that L cell is secreted under the stimulation absorbed nourishment a kind of Plain sample peptide -1 (GLP-1) has the function of promoting insulin secretion.GLP-1 by with throughout in pancreas, brain, gastrointestinal tract, the heart GLP-1 receptor (GLP-1R) in the tissue such as dirty, lung is associated and shows the physiological action of blood glucose-control, but GLP-1R is in pancreas In abundance to be much higher than its hetero-organization [3].GLP-1R secretion determines that GLP-1 is complicated and extensive in the characteristics of multiple tissue Physiological function.In terms of physiology, GLP-1 major function includes: 1. to stimulate insulin secretion.GLP-1 is concentration of glucose Dependent form hormone can just play when blood sugar concentration is higher than normal level and promote insulin secretion effect, mortality is not occurring Blood sugar reducing function is played under the premise of the risk of hypoglycemia.2. GLP-1 can contain glucagon secretion in conjunction with alpha Cell of islet [8].3. inhibiting β Apoptosis.Farilla et al. discovery, GLP-1 can stablize the three-dimensional structure of pancreas islet, and islet cells is inhibited to subtract It is few;Hui [10] et al. discovery, GLP-1 can inhibit apoptotic proteins active, promote the expression of anti-apoptotic proteins, inhibit β to play The effect of Apoptosis.4. GLP-1 can promote to transcribe insulin gene, it is proliferated islet cells and promotes pancreatic stem cell differentiation β cell is proliferated for β cell.5. inhibiting bowel movement and gastric emptying, appetite is reduced, promotes liver, fat, musculature glycogen Synthesis.
China is most one of the country of diabetes B number of patients, and disease incidence is up to 11.6%, and diabetes have become prestige The serious public health problem of people's the level of physical diathesis is coerced, it is heavy that annual health care costs are brought to diabetic and country The burden of weight, it is extremely urgent to develop the new treatment diabetes medicament having no toxic side effect.Since GLP-1 makees without gastrointestinal tract pair With it is anti-mainly to develop three classes GLP-1 class in the market for protection beta Cell of islet, the safe hypoglycemic effect for promoting insulin secretion Diabetes medicament: DDP-4 inhibitor, GLP-1R agonist, GLP-1 analog have shown good application prospect at this stage, And part has been used for clinic.
Small ubiquitin-related modifier proteins (SUMO) are a kind of height for being distributed widely in about 15kD in various eukaryotic cells Conservative little albumen, its structure and reactive mode is similar to ubiquitin, but has the function of different.SUMOization modification and ubiquitin The common ground for changing modification is lysine residue that binding site is destination protein, cohesive process be required to activating enzymes, desmoenzyme, The participation of ligase, but the activating enzymes of ubiquitination and ligase huge number, and both enzymes of SUMOization modification only have One kind, this is likely to be the reason of protein stability after SUMO is modified significantly improves.Stability in addition to improving albumen, SUMO can also inhibit protein degradation because the binding site of SUMO and ubiquitin is lysine, the two can it is emulative with Binding Capacity, to play antiprotease hydrolysis function.In addition, SUMOization modification can also keep the steady of antigen-4 fusion protein gene group It is qualitative, it folds polypeptide normally, improves the solubility of fusion protein.
Glucagon-like-peptide-1 is easily degraded as a kind of small molecular protein and is difficult to purify, and how to improve existing GLP-1 recombinant expression method improves its yield and simplifies purification step as urgent problem to be solved in the prior art.
Summary of the invention
To solve aforementioned technical problem, the sequence of GLP-1 is recombinated to obtain rolGLP-1 by the present invention, then by SUMO with It, is then cloned on the pET 22b expression vector in escherichia expression system, constructs a weight by rolGLP-1 fusion Group SUMO-rolGLP-1 prokaryotic expression carrier, makes it in E. coli, isolates and purifies SUMO- using Ni-FF RolGLP-1, then the SUMO-rolGLP-1 albumen after SUMO protease digestion is adsorbed into SUMO albumen, super filter tube using Ni-FF RolGLP-1 is collected by centrifugation.
The technical solution adopted by the present invention is to provide a kind of recombinant expression method of glucagon-like-peptide-1, feature It is that the described method comprises the following steps
1) it constructs a kind of containing the DNA sequence dna for encoding small ubiquitin-related modifier proteins (SUMO) and coding Gluca Gen The fusion SUMO-rolGLP-1 of the DNA sequence dna of sample polypeptide -1 (rolGLP-1);The fusion SUMO-rolGLP-1 In, in the DNA sequence dna of the coding Gluca Gen sample polypeptide -1 (rolGLP-1), dipeptidyl peptidase Ⅳ and trypsase are known Other site has been removed, and the 8th Ala is replaced by Ser, and the 26th and 34 Lys is replaced by Gln and Asp respectively;It is described to melt The DNA sequence dna of gene SUMO-rolGLP-1 is closed as shown in sequence 1.
In the step 1), the method for obtaining the fusion SUMO-rolGLP-1 is will by the method for recombinant PCR The DNA sequence dna for encoding SUMO, which merge with the DNA sequence dna of coding rolGLP-1, obtains the fusion SUMO-rolGLP- 1;Detailed process includes: to be merged SUMO gene with rolGLP-1 gene by the method for recombinant PCR, by SUMO-GLP-1 Fusion gene cloning obtains pMD18T-Simple-SUMO-GLP-1, the carrier is i.e. such as sequence 1 to pMD18T-Simple carrier Shown in fusion SUMO-GLP-1 gene order.
2) a kind of coli expression carrier pNK-EC-SUMO- including fusion SUMO-rolGLP-1 is constructed The colibacillus engineering NK-SUMO-rolGLP-1 of rolGLP-1 and high expression fusion SUMO-rolGLP-1, it is specific Step includes
2.1) the fusion SUMO-rolGLP-1 that step 1) obtains is cloned into pMD18T-Simple carrier, is wrapped The cloning vector pMD18T-Simple-SUMO-rolGLP-1 of the SUMO-rolGLP-1 containing fusion;
2.2) coli expression carrier pNK-EC-SUMO-rolGLP-1, the structure of the coli expression carrier are provided It is as follows to build process:
The fusion SUMO- in cloning vector pMD18T-Simple-SUMO-rolGLP-1 that step 2.1) is obtained RolGLP-1 carries out digestion with BamH I and Nde I restriction endonuclease, and digestion fusion SUMO-rolGLP-1 after the recovery is connected into PET-22b (+) carrier, building obtain coli expression carrier pNK-EC-SUMO-rolGLP-1;
2.3) Escherichia coli are converted with the coli expression carrier pNK-EC-SUMO-rolGLP-1 that step 2.2) obtains BL21 (DE3) screens the bacterial strain of wherein highly expressed fusion SUMO-rolGLP-1 as colibacillus engineering NK- SUMO-rolGLP-1。
3) inducing expression is carried out to colibacillus engineering strain NK-SUMO-rolGLP-1, obtains SUMO-rolGLP-1 and melts Hop protein.
4) nickel-Ago-Gel (Ni-FF) purification procedures 3 are used) obtained SUMO-rolGLP-1 fusion protein,
5) the SUMO-rolGLP-1 albumen by step 4) purifying uses SUMO protease digestion SUMO-rolGLP-1, obtains The mixture of SUMO and rolGLP-1 polypeptide
6) after the mixture for the SUMO and rolGLP-1 polypeptide that step 5) obtains is using Ni-FF absorption SUMO albumen, ultrafiltration RolGLP-1 albumen is collected by centrifugation in pipe.
A kind of recombinant expression method of glucagon-like-peptide-1 provided by the invention is obtained with gene manipulation techniques SUMO-rolGLP-1 fusion is cloned into coli expression carrier and obtains pNK-EC-SUMO-rolGLP-1, and Colibacillus engineering strain NK-SUMO-rolGLP- is constructed based on coli expression carrier pNK-EC-SUMO-rolGLP-1 1, by the inducing expression to colibacillus engineering strain, expression product is isolated and purified using affinity chromatography, be can get SUMO-rolGLP-1 albumen is carried out digestion using SUMO protease, produced after digestion by high-purity SUMO-rolGLP-1 albumen Object is using the rolGLP-1 albumen that can be obtained high-purity after purification.
Detailed description of the invention
Fig. 1 is coli expression carrier pNK-EC-SUMO-rolGLP-1 described in step 2.2) in specific embodiment Building process schematic diagram;
Fig. 2 is the gel for the fusion SUMO-rolGLP-1 that step 1) is obtained by recombinant PCR in specific embodiment Electrophoretogram;
Fig. 3 carries out NK-SUMO-rolGLP-1 with colibacillus engineering strain for step 3) in specific embodiment and induces table Up to the inducing expression and soluble analysis gel electrophoresis figure for obtaining SUMO-rolGLP-1 fusion protein.
Fig. 4 carries out NK-SUMO-rolGLP-1 with colibacillus engineering strain for step 3) in specific embodiment and induces table Up to the SDS-PAGE electrophoresis detection and Western blot testing result figure for obtaining SUMO-rolGLP-1 fusion protein
Fig. 5 is to purify SUMO-rolGLP-1 albumen and digestion products in step 4) and step 5) in specific embodiment Gel electrophoresis figure;
Fig. 6 is the gel electrophoresis figure of the rolGLP-1 albumen of step 6) after purification in specific embodiment.
Specific embodiment
1) is melted the DNA sequence dna of the DNA sequence dna for encoding SUMO and coding rolGLP-1 by the method for recombinant PCR It closes and obtains the fusion SUMO-rolGLP-1.
PCR primer used in the recombinant PCR is the DNA sequencing fragment and coding rolGLP-1 according to coding SUMO DNA sequencing fragment design, comprising:
Primer 1, sequence are SEQ ID NO:2
Primer 2, sequence are SEQ ID NO:3
Primer 3, sequence are SEQ ID NO:4
Primer 4, sequence are SEQ ID NO:5
The specific method of the recombinant PCR be using primer 1 and primer 2 as upstream and downstream, be to encode the DNA sequence dna of SUMO Template expands SUMO-Linker gene, PCR reaction condition are as follows: 94 DEG C of initial denaturation 5min, 94 DEG C of denaturation 30s, 60 DEG C are annealed 1min 72 DEG C, extends 1min, recycles 20 times, 72 DEG C of extension 5min;
It is expanded using primer 3 and primer 4 as upstream and downstream primer using the DNA sequence dna for encoding rolGLP-1 as template Linker-rolGLP-1 gene, PCR reaction condition are 94 DEG C of initial denaturation 5min, 94 DEG C of denaturation 30s, 60 DEG C of annealing 1min, 72 DEG C Extend 1min, recycles 20 times, 72 DEG C re-extend 5min.
It is respectively upstream and downstream primer with primer 1 and primer 4, with SUMO-Linker gene and Linker-rolGLP-1 base Because template obtains SUMO-rolGLP-1 gene, PCR reaction condition: 94 DEG C of initial denaturation 5min, 94 DEG C of denaturation 30s, 60 DEG C are annealed 1min, 72 DEG C of extension 1min are recycled 20 times, and 72 DEG C re-extend 5min.Fusion SUMO-rolGLP-1 is obtained, sequence is such as Shown in sequence 1, the gel electrophoresis figure of amplified production is as shown in Fig. 2, swimming lane 1 is 100bp DNA Ladder Marker, swimming in figure Road 2~5 is the fusion SUMO-rolGLP-1 product that recombinant PCR expands.
The DNA sequence dna of the SUMO-Linker gene is as shown in SEQ ID NO:6, the Linker-rolGLP-1 gene DNA sequence dna as shown in SEQ ID NO:7.
2) a kind of coli expression carrier pNK-EC-SUMO- including fusion SUMO-rolGLP-1 is constructed The colibacillus engineering NK-SUMO-rolGLP-1 of rolGLP-1 and high expression fusion SUMO-rolGLP-1, it is specific Step includes
2.1) the fusion SUMO-rolGLP-1 that step 1) obtains is cloned into pMD18T-Simple carrier, is wrapped The cloning vector pMD18T-Simple-SUMO-rolGLP-1 of the SUMO-rolGLP-1 containing fusion;
2.2) coli expression carrier pNK-EC-SUMO-rolGLP-1, the structure of the coli expression carrier are provided It is as follows to build process:
The fusion SUMO- in cloning vector pMD18T-Simple-SUMO-rolGLP-1 that step 2.1) is obtained RolGLP-1 carries out digestion with BamH I and Nde I restriction endonuclease, and digestion fusion SUMO-rolGLP-1 after the recovery is connected into PET-22b (+) carrier, building obtain coli expression carrier pNK-EC-SUMO-rolGLP-1;The Bacillus coli expression Carrier pNK-EC-SUMO-rolGLP-1 building process schematic diagram is as shown in Figure 1.
2.3) with step 2.2) obtain through correct coli expression carrier pNK-EC-SUMO-rolGLP-1 is sequenced It converts e. coli bl21 (DE3), screens the bacterial strain of wherein highly expressed fusion SUMO-rolGLP-1 as Escherichia coli Engineering bacteria NK-SUMO-rolGLP-1.
3) inducing expression is carried out to colibacillus engineering strain NK-SUMO-rolGLP-1, obtains SUMO-rolGLP-1 and melts Hop protein
By colibacillus engineering strain NK-SUMO-rolGLP-1, in 37 DEG C, 180rpm shaking flask culture to OD600 be 0.6- Final concentration of 1mmol/L inducer IPTG is added when 0.8, and 4h is induced under the conditions of 37 DEG C, centrifuging and taking thallus carries out ultrasonication, Extract proteins, which carry out 15%SDS-PAGE electrophoresis detection, proves successful expression SUMO-GLP-1 fusion protein.Western blot (immunoblotting) the result shows that, the antibody of SUMO-rolGLP-1 fusion protein and GLP-1 specificity can carry out specificity In conjunction with.For the gel electrophoresis figure of inducing expression and soluble analysis as shown in figure 3, in figure, M is albumen marker, and swimming lane 1 is the positive It compares (whole cell after induction), swimming lane 2 is to precipitate after induction is broken, and swimming lane 3 is supernatant after induction is broken, and swimming lane 4 is negative right According to (before induction).The SDS-PAGE electrophoresis detection and Western blot of SUMO-rolGLP-1 fusion protein are detected such as Fig. 4 institute Show, swimming lane M in Fig. 4 (A): standard Marker;Swimming lane 1: before induction;Swimming lane 2,3: supernatant after ultrasonication, Fig. 4 (B) are SUMO- The Wester-blot result of rolGLP-1 fusion protein.
4) SUMO-rolGLP-1 is isolated and purified using Ni-FF
Supernatant after step 3) ultrasonic treatment is subjected to affinity chromatography (Ni-FF chromatographic column) purification process, is obtained high-purity The SUMO-rolGLP-1 albumen of degree.It is concentrated using the super filter tube of 10kDa, desalination.Purifying
5) SUMO protease digestion SUMO-rolGLP-1 albumen is used, the mixture of SUMO and rolGLP-1 polypeptide is obtained Digestion will be carried out with SUMO enzyme by the SUMO-rolGLP-1 albumen of concentration desalination in step 4), obtains SUMO and rolGLP-1 The mixture of albumen.The gel electrophoresis figure of SUMO-rolGLP-1 and digestion products are purified as shown in figure 5, M is ultra-low molecular in figure Measure albumen marker, swimming lane 1SUMO-rolGLP-1 albumen;Swimming lane 2-6 is product after SUMO-rolGLP-1 proteolytic cleavage.
6) after by digestion products using Ni-FF absorption SUMO albumen, rolGLP-1 albumen is collected by centrifugation by step in super filter tube 5) mixture for the SUMO and rolGLP-1 albumen that digestion obtains carries out affinity chromatography (Ni-FF chromatographic column) purification process, SUMO Albumen can be adsorbed by Ni-FF, then be centrifuged with the super filter tube of 3kDa, and collecting filtrate is rolGLP-1 albumen, the purifying The liquid chromatogram content of rolGLP-1 albumen afterwards is 91.81%, gel electrophoresis figure such as Fig. 6 of rolGLP-1 albumen after purification Shown, in figure, M is Ultra-low molecular weight albumen marker, and swimming lane 1, swimming lane 2 are rolGLP-1 after purification.

Claims (2)

1.一种胰高血糖素样肽-1的重组表达方法,其特征是所述方法包括以下步骤1. a recombinant expression method of glucagon-like peptide-1, it is characterized in that described method comprises the following steps 1)构建一种含有编码小泛素相关修饰物(SUMO)的DNA序列和编码重组胰高血糖素样多肽-1(rolGLP-1)的DNA序列的融合基因SUMO-rolGLP-1;所述融合基因SUMO-rolGLP-1中,所述的编码重组胰高血糖素样多肽-1(rolGLP-1)的DNA序列中,二肽酶Ⅳ和胰蛋白酶识别位点已被去除,第8位的Ala被Ser取代,第26位和34位的Lys分别被Gln和Asp取代;所述融合基因SUMO-rolGLP-1的DNA序列如序列1所示;1) Construct a fusion gene SUMO-rolGLP-1 containing a DNA sequence encoding a small ubiquitin-related modifier (SUMO) and a DNA sequence encoding a recombinant glucagon-like polypeptide-1 (rolGLP-1); the fusion In the gene SUMO-rolGLP-1, in the DNA sequence encoding recombinant glucagon-like polypeptide-1 (rolGLP-1), dipeptidase IV and trypsin recognition sites have been removed, and Ala at position 8 has been removed. Replaced by Ser, and Lys at positions 26 and 34 were replaced by Gln and Asp respectively; the DNA sequence of the fusion gene SUMO-rolGLP-1 is shown in sequence 1; 所述步骤1)中,获得所述融合基因SUMO-rolGLP-1的方法为通过重组PCR的方法将编码SUMO的DNA序列与编码rolGLP-1的DNA序列进行融合获得所述融合基因SUMO-rolGLP-1;具体过程包括:通过重组PCR的方法将SUMO基因与rolGLP-1基因进行融合,将SUMO-GLP-1融合基因克隆到pMD18 T-Simple载体,获得pMD18 T-Simple-SUMO-GLP-1,该载体如序列1所示的融合基因SUMO-GLP-1的基因序列;In the step 1), the method for obtaining the fusion gene SUMO-rolGLP-1 is to obtain the fusion gene SUMO-rolGLP-1 by fusing the DNA sequence encoding SUMO with the DNA sequence encoding rolGLP-1 by recombinant PCR 1; The specific process includes: fusing the SUMO gene with the rolGLP-1 gene by recombinant PCR, and cloning the SUMO-GLP-1 fusion gene into the pMD18 T-Simple vector to obtain pMD18 T-Simple-SUMO-GLP-1, The vector is the gene sequence of the fusion gene SUMO-GLP-1 shown in sequence 1; 2)构建一种包括融合基因SUMO-rolGLP-1的大肠杆菌表达载体2) construct a kind of Escherichia coli expression vector including fusion gene SUMO-rolGLP-1 pNK-EC-SUMO-rolGLP-1和高表达融合基因SUMO-rolGLP-1的大肠杆菌工程菌NK-SUMO-rolGLP-1;pNK-EC-SUMO-rolGLP-1 and Escherichia coli engineering strain NK-SUMO-rolGLP-1 with high expression of fusion gene SUMO-rolGLP-1; 3)对大肠杆菌工程菌株NK-SUMO-rolGLP-1进行诱导表达,获得SUMO-rolGLP-1融合蛋白;3) Inducing expression of Escherichia coli engineering strain NK-SUMO-rolGLP-1 to obtain SUMO-rolGLP-1 fusion protein; 4)使用镍-琼脂糖凝胶(Ni-FF)分离纯化步骤3)得到的SUMO-rolGLP-1融合蛋白;4) using nickel-sepharose (Ni-FF) to separate and purify the SUMO-rolGLP-1 fusion protein obtained in step 3); 5)将步骤4)纯化的SUMO-rolGLP-1蛋白使用SUMO蛋白酶酶切SUMO-rolGLP-1,获得SUMO和rolGLP-1蛋白的混合物;5) The SUMO-rolGLP-1 protein purified in step 4) is digested with SUMO protease to obtain a mixture of SUMO and rolGLP-1 proteins; 6)步骤5)得到的SUMO和rolGLP-1蛋白的混合物使用Ni-FF吸附SUMO蛋白后,超滤管离心收集rolGLP-1蛋白。6) After the mixture of SUMO and rolGLP-1 protein obtained in step 5) uses Ni-FF to adsorb SUMO protein, the rolGLP-1 protein is collected by ultrafiltration tube centrifugation. 2.如权利要求1所述的一种胰高血糖素样肽-1的重组表达方法,其特征是所述步骤2)具体包括:2. the recombinant expression method of a kind of glucagon-like peptide-1 as claimed in claim 1 is characterized in that described step 2) specifically comprises: 2.1)将步骤1)得到的融合基因SUMO-rolGLP-1克隆到pMD18 T-Simple载体,获得包含融合基因SUMO-rolGLP-1的克隆载体pMD18 T-Simple-SUMO-rolGLP-1;2.1) The fusion gene SUMO-rolGLP-1 obtained in step 1) was cloned into the pMD18 T-Simple vector, and the cloning vector pMD18 T-Simple-SUMO-rolGLP-1 containing the fusion gene SUMO-rolGLP-1 was obtained; 2.2)提供大肠杆菌表达载体pNK-EC-SUMO-rolGLP-1,所述大肠杆菌表达载体的构建过程如下:2.2) The E. coli expression vector pNK-EC-SUMO-rolGLP-1 is provided, and the construction process of the E. coli expression vector is as follows: 将步骤2.1)得到的克隆载体pMD18 T-Simple-SUMO-rolGLP-1中的融合基因SUMO-rolGLP-1用BamH I和Nde I内切酶进行酶切,将酶切回收后的融合基因SUMO-rolGLP-1连入pET-22b(+)载体,构建得到大肠杆菌表达载体pNK-EC-SUMO-rolGLP-1;The fusion gene SUMO-rolGLP-1 in the cloning vector pMD18 T-Simple-SUMO-rolGLP-1 obtained in step 2.1) was digested with BamH I and Nde I endonucleases, and the fusion gene SUMO- The rolGLP-1 was connected to the pET-22b(+) vector to construct the E. coli expression vector pNK-EC-SUMO-rolGLP-1; 2.3)用步骤2.2)得到的大肠杆菌表达载体pNK-EC-SUMO-rolGLP-1转化大肠杆菌BL21(DE3),筛选其中高表达的融合基因SUMO-rolGLP-1的菌株作为大肠杆菌工程菌NK-SUMO-rolGLP-1。2.3) Use the E. coli expression vector pNK-EC-SUMO-rolGLP-1 obtained in step 2.2) to transform E. coli BL21 (DE3), and screen the strain with the highly expressed fusion gene SUMO-rolGLP-1 as E. coli engineering bacteria NK- SUMO-rolGLP-1.
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