WO2019103512A2 - 목적 단백질의 발현 효율을 증진시키기 위한 신규한 펩타이드 및 이를 포함하는 융합 단백질 - Google Patents
목적 단백질의 발현 효율을 증진시키기 위한 신규한 펩타이드 및 이를 포함하는 융합 단백질 Download PDFInfo
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- C12N2770/16022—New viral proteins or individual genes, new structural or functional aspects of known viral proteins or genes
Definitions
- the present invention relates to novel peptides for enhancing the expression efficiency of a target protein and fusion proteins comprising the novel peptides. More specifically, the present invention relates to a peptide comprising 7 amino acids derived from urate oxidase or a peptide fragment thereof, and a fusion protein comprising a RID (RNA interacting domain) as a fusion partner with the peptide .
- RID RNA interacting domain
- coli have low expression levels or lack the proper " post-translational chaperons " or " posttranslational processing & (Recombinant protein expression in Escherichia coli, Current Opinion in Biotechnology (1999), 10: 411-421).
- the recombinant protein is expressed as an insoluble protein inclusion body.
- RID RNA interacting domain, N-terminal appended RNA binding domain of Lysyl tRNA synthetase
- RID itself has a large or large disadvantage that the expression level is very low.
- Norovirus is one of the major pathogens causing acute gastroenteritis worldwide, and 200,000 children under 5 years of age die each year from Norovirus. Noroviruses are mainly infected through the fecal-oral route and cause nausea, vomiting, diarrhea, and dehydration.
- Norovirus belonging to Caliciviridae is a membrane-free virus with a diameter of about 30 to 40 nm. It consists of 7.6 kbp single stranded (+) RNA and has 3 open reading frames (ORFs). Of these, ORF2 is encoded by the major structural protein VP1 in the form of Norovirus, and ORF3 is encoded by the VP2 protein, but is not directly involved in the formation of the structure.
- VP1 has a total size of 59 kDa and is a dimer. These 90 dimers are self-assembled and a total of 180 VP1 forms a virus particle.
- the VP1 protein consists of two domains: the S domain (S domain) and the P domain (P domain) are involved in the induction of an actual immune response.
- VLP Virus-Like Particles
- VLPs are highly complex and elaborate constructs that specifically express viral structural proteins to show a similar structure to that of wild-type viruses. Because of its similar structure to the wild-type virus, it can induce a high immune response in the body and can stimulate both T-cell and B-cell immune pathways. In addition, it is characterized by high safety due to lack of infectivity due to absence of genetic material in the formed structure and excellent structural stability. However, the structure is complicated and it is very difficult to make a complete VLP.
- Norovirus VLPs are mainly produced in baculovirus-insect cells and are known to be capable of producing VLPs in yeast.
- Escherichia coli has reported that it expresses the structural protein (VP1) in a water-soluble form, it has never been reported to form a virus-like particle (VLP). If Norovirus VLPs derived from Escherichia coli can be developed, most casualties to Norovirus can make a significant contribution to human society as a low-cost vaccine compared to vaccines using different expression systems as they occur in developing countries.
- LysRS Lysyl tRNA synthetase
- RBD RNA Binding Domain
- LysRS is not only a large protein of about 100 kDa, but also because of the steric hindrance due to the structural limitations of dimer formation, it is necessary that the recombinant protein has three dimensional structure, It may interfere with the formation of oligomers, monomers, or monomers. Therefore, RID (RNA interacting domain, N-terminal appended RNA binding domain of Lysyl tRNA synthetase) is used as an RNA binding domain to replace LysRS.
- RID RNA interacting domain, N-terminal appended RNA binding domain of Lysyl tRNA synthetase
- RID itself has a disadvantage in that the expression level is very low.
- Protein expression levels can be determined by a variety of factors, but it is known that the N-terminal sequence of a protein, precisely the mRNA sequence, is important for protein expression levels.
- the inventors of the present invention found that the urate oxidase protein was abnormally expressed in Escherichia coli during the study of the water solubility and the expression efficiency of the protein, and the N-terminal sequence of the uric acid oxidase expressed the expression of the target protein And the effect on the expression of RID was confirmed and the present invention was completed.
- the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a peptide having 7 amino acids derived from uric acid oxidase or a partial sequence thereof, which plays a crucial role in enhancing the expression efficiency of a target protein, Amino acid peptides are also applied to the RID (RNA interacting domain) known as a water-solubility enhancing partner, thereby confirming that the expression efficiency of the target protein can be enhanced and the water-solubility can be enhanced, thus completing the present invention.
- RID RNA interacting domain
- the present invention provides a method for producing a recombinant vector comprising the steps of: expressing a peptide comprising 7 amino acids or a partial sequence thereof derived from uric acid oxidase, a polynucleotide encoding the peptide, an expression vector comprising the peptide and a host cell transformed with the expression vector
- the purpose is to provide.
- the present invention also relates to a fusion protein comprising RID as a fusion partner with a peptide comprising 7 amino acids or a partial sequence thereof derived from uric acid oxidase, an expression vector comprising said fusion protein, and an expression vector To a host cell.
- the present invention also provides a method for producing an expression vector, comprising the steps of: preparing an expression vector comprising a polynucleotide encoding a target protein and a polynucleotide encoding a peptide that enhances expression efficiency of a target protein bound to the 5'-terminal of the polynucleotide; To a host cell to produce a transformant, and culturing the transformant to induce the expression of the recombinant target protein and obtaining the same, thereby providing a method for producing a water-soluble target protein .
- the present invention also provides a recombinant expression vector for producing Norovirus vaccine capable of enhancing the expression efficiency of the VP1 protein and enhancing the water solubility by using Norovirus VP1 protein which is not expressed well in prokaryotic cells as a target protein, Transformed host cells, and methods for producing norovirus vaccines using the vectors and host cells.
- the present invention provides a peptide for enhancing the expression efficiency of a target protein comprising the amino acid sequence represented by SEQ ID NO: 1 or a partial sequence thereof.
- Urate oxidase (EC 1.7.3.3 (uricase) is an enzyme that acts on the purine cleavage mechanism.) Uricase is an enzyme that oxidizes uric acid to allantoin. And the uric acid is the final substance of the purine metabolism.It is because the metabolites free acid and urate salt are both water insoluble, In order to treat the gout efficiently, a therapeutic method of directly injecting a non-human carase into a human is practiced.
- target protein refers to any protein that a person skilled in the art intends to produce in large quantities and which is capable of expressing in a host cell by inserting a polynucleotide encoding the protein into a recombinant expression vector .
- the term " peptide for enhancing the expression efficiency of a target protein " or " expression enhancer tag (eet) " refers to a short peptide sequence which enhances the expression efficiency of a protein by being fused to the N- .
- the peptide for enhancing the expression efficiency of a target protein in the present invention includes a seven amino acid sequence represented by SEQ ID NO: 1 or a partial sequence thereof.
- recombinant protein or "fusion protein” refers to a protein that is linked to another protein at the N- or C-terminus of the original target protein sequence, .
- amino acid sequence of SEQ ID NO: 1 or a partial sequence thereof may be derived from urate oxidase.
- a part of the sequence of SEQ ID NO: 1 may include the amino acid sequence of SEQ ID NO: 2.
- the peptide for enhancing the expression efficiency of the target protein may bind to the N-terminal of the target protein.
- the target protein may be selected from the group consisting of an antigen, an antibody, a cell receptor, an enzyme, a structural protein, a serum and a cell protein.
- the antigen may be a VP1 protein derived from Norovirus.
- the present invention also provides a polynucleotide encoding a peptide for enhancing the expression efficiency of the target protein.
- the polynucleotide may be a polynucleotide encoding the amino acid sequence of SEQ ID NO: 1 or SEQ ID NO: 2.
- polynucleotide encoding SEQ ID NO: 1 may be a sequence represented by SEQ ID NO: 3
- polynucleotide encoding SEQ ID NO: 2 may be the sequence represented by SEQ ID NO: 4.
- the present invention also provides an expression vector comprising a peptide for enhancing the expression efficiency of the target protein.
- the present invention provides an expression vector comprising a polynucleotide encoding a target protein and a polynucleotide encoding a peptide for enhancing the efficiency of expression of the target protein bound to the 5'-terminal of the polynucleotide encoding the target protein do.
- expression vector is a linear or circular DNA molecule consisting of a fragment encoding a polypeptide of interest operably linked to an additional fragment provided in the transcription of the expression vector. Such additional fragments include promoter and termination coding sequences.
- the expression vector also includes at least one replication origin, at least one selection marker, a polyadenylation signal, and the like. Expression vectors are generally derived from plasmid or viral DNA, or contain both elements.
- operably linked indicates that fragments are arranged such that transcription in the promoter begins and proceeds through the coding sequence to the termination cipher.
- the expression vector may be a plasmid, a viral vector, a phage particle or a genome insert.
- the expression vector may be transformed into a host cell and then cloned or integrated into the genome of the host cell irrespective of the genome of the host cell.
- the present invention also provides a host cell transformed with an expression vector comprising a peptide for enhancing the expression efficiency of the target protein.
- transformation or " introduction” as used herein means that DNA is introduced into a host and the DNA becomes replicable as an extrachromosomal element or by chromosome integration completion.
- Methods for transforming an expression vector according to the present invention include electroporation, calcium phosphate (CaPO 4 ), calcium chloride (CaCl 2 ), microinjection, polyethylene glycol (PEG), DEAE- Tran method, cationic liposome method, or lithium acetate-DMSO method, but the method is not limited thereto.
- the host cell is preferably a host cell having high efficiency of DNA introduction and high efficiency of expression of the introduced DNA, and all microorganisms including prokaryotic and eukaryotic cells can be used.
- the host cell may be E. coli .
- the present invention also provides a method for producing a target protein with enhanced expression efficiency.
- the method for producing the target protein comprises:
- the present invention provides a fusion protein for enhancing the expression efficiency and water solubility of a target protein comprising an RID (RNA interacting domain) as a peptide comprising the amino acid sequence of SEQ ID NO: 1 or a partial sequence thereof and a fusion partner thereof.
- RID RNA interacting domain
- RNA interacting domain N terminal appended RNA binding domain of Lysyl tRNA synthetase
- amino acid sequence of SEQ ID NO: 1 may be derived from uric acid oxidase.
- the peptide may bind to the N-terminal of the target protein.
- the fusion protein for enhancing expression efficiency and water solubility of a target protein according to the present invention may include the amino acid sequence represented by SEQ ID NO: 7.
- the fusion protein of the present invention may include the amino acid sequence shown in SEQ ID NO: 9.
- the target protein may be selected from the group consisting of an antigen, an antibody, a cell receptor, an enzyme, a structural protein, a serum and a cell protein have.
- the present invention also relates to a method for enhancing the expression efficiency and water solubility of a target protein having a fusion protein comprising a RID as a fusion partner and a peptide comprising an amino acid of SEQ ID NO: 1 or a partial sequence thereof, Expression vector.
- the expression vector may be a plasmid, a viral vector, a phage particle or a genome insert.
- the expression vector may be transformed into a host cell and then cloned or integrated into the genome of the host cell irrespective of the genome of the host cell.
- the present invention also relates to a method for enhancing the expression efficiency and water solubility of a target protein having a fusion protein comprising a RID as a fusion partner and a peptide comprising an amino acid of SEQ ID NO: 1 or a partial sequence thereof, To provide a host cell transformed with an expression vector.
- the host cell is preferably a host cell having high efficiency of DNA introduction and high efficiency of expression of the introduced DNA, and all microorganisms including prokaryotic and eukaryotic cells can be used.
- the host cell may be E. coli .
- the present invention also provides a method for producing a target protein with enhanced expression efficiency and water solubility.
- the method for producing the target protein comprises:
- the present invention also relates to a method for the production of a target protein, And a peptide for promoting the expression efficiency of a target protein comprising 7 amino acids derived from uric acid oxidase or a partial sequence thereof, in a recombinant expression vector for producing a norovirus vaccine.
- the peptide for enhancing the expression efficiency of the target protein may be one derived from urate oxidase, or the amino acid sequence of SEQ ID NO: have.
- a part of the sequence of SEQ ID NO: 1 may include the amino acid sequence of SEQ ID NO: 2.
- the recombinant expression vector for the production of the Norovirus vaccine of the present invention may contain a polynucleotide encoding the peptide of SEQ ID NO: 1 for enhancing the expression efficiency of the target protein.
- polynucleotide encoding the peptide of SEQ ID NO: 1 may be the sequence of SEQ ID NO: 3
- the polynucleotide encoding the peptide of SEQ ID NO: 2 may be the sequence of SEQ ID NO: 4.
- the recombinant expression vector for producing norovirus comprises a polynucleotide encoding 1 to 6 histidines; And a polynucleotide encoding a protein cleavage enzyme recognition site.
- the polynucleotide encoding the above 1 to 6 histidine may be represented by SEQ ID NO: 10.
- the protein-cleaving enzyme may be TEV.
- the polynucleotide encoding the protein cleavage enzyme recognition site may be represented by SEQ ID NO: 11.
- the expression vector may be a plasmid, a viral vector, a phage particle or a genome insert.
- the expression vector may be transformed into a host cell and then cloned or integrated into the genome of the host cell irrespective of the genome of the host cell.
- the present invention also relates to the aforementioned Norovirus-derived VP1 protein; And an expression vector comprising a peptide for enhancing expression efficiency of a target protein.
- the host cell is preferably a host cell having high efficiency of DNA introduction and high efficiency of expression of the introduced DNA, and all microorganisms including prokaryotic and eukaryotic cells can be used.
- the host cell may be E. coli .
- the present invention also seeks to provide a method for producing a norovirus vaccine with enhanced expression efficiency.
- the method for producing the norovirus vaccine comprises:
- a VP1 protein derived from Norovirus as a target protein (a) a VP1 protein derived from Norovirus as a target protein; And a peptide for enhancing the expression efficiency of a target protein comprising the amino acid sequence of SEQ ID NO: 1 or a partial sequence thereof; producing a recombinant expression vector for the production of a norovirus vaccine comprising the polynucleotide;
- the present invention also relates to a VP1 protein derived from Norovirus; And a fusion protein for enhancing the expression efficiency and water solubility of a target protein comprising an RID (RNA interacting domain) as a fusion partner of the peptide with the peptide comprising the amino acid sequence of SEQ ID NO: 1 or a partial sequence thereof and a polynucleotide To provide a recombinant expression vector for the production of a norovirus vaccine.
- RID RNA interacting domain
- the expression vector of the present invention comprises a polynucleotide encoding a target protein and a polynucleotide encoding a fusion protein bound to the 5'-terminal of the polynucleotide encoding the target protein, A fusion protein of a peptide and RID to enhance expression efficiency.
- fusion protein or " recombinant protein” refers to a protein that is linked to another protein at the N- or C-terminus of the original target protein sequence, .
- the present invention also seeks to provide a method for producing an effective Norovirus vaccine with enhanced expression efficiency and water solubility.
- the method of producing the Norovirus vaccine comprises:
- a recombinant target protein having a fusion protein comprising an amino acid of SEQ ID NO: 1 or a peptide comprising a partial sequence thereof and RID which enhances water solubility as a fusion partner thereof, at the N-terminus of the VP1 protein derived from Norovirus Preparing an expression vector;
- the peptide containing 7 amino acids derived from the uric acid oxidase according to the present invention can improve the expression efficiency of the target protein and the fusion protein in which the peptide is bound to the RID well known as a water soluble enhancer protein has an expression efficiency By improving water solubility as well, it can be usefully used for the production of a recombinant target protein.
- the peptide that enhances the expression efficiency of the target protein according to the present invention can be applied together with the RID known as a soluble and enhancing fusion partner of the peptide and the peptide capable of improving the expression efficiency of a target protein, And at the same time, can be usefully used for the production of a recombinant target protein.
- FIG. 1 shows experimental results showing the effect of the peptide (eet1) of the present invention on the expression efficiency of EGFP protein (A: SDS-PAGE showing the expression of each fusion protein, B: a control group treated with 80 ⁇ M of IPTG ) Was expressed as 1, and C: graph showing the relative activity of each relative activity when the protein activity of the control group treated with 80 M of IPTG was 1).
- FIG. 2 shows the results of comparing the effect of the peptide of the present invention or its part on the expression efficiency and activity of EGFP protein (A: SDS-PAGE showing the expression of each fusion protein, B: control group treated with 80 ⁇ M IPTG (MSEQHAQ-EGFP) expressed as 1, the relative expression level of each protein, and the relative activity of D: protein glycoprotein activity when the protein activity of the control group treated with C: IPTG 80 ⁇ M was regarded as 1 graph).
- A SDS-PAGE showing the expression of each fusion protein
- B control group treated with 80 ⁇ M IPTG (MSEQHAQ-EGFP) expressed as 1
- D protein glycoprotein activity when the protein activity of the control group treated with C: IPTG 80 ⁇ M was regarded as 1 graph
- FIG. 3 is a graph showing the effect of the peptide of the present invention on the expression of TruB, an Escherichia coli-derived protein (A: SDS-PAGE showing the expression of each fusion protein, and B: Relative expression level).
- FIG. 4 is a graph (A) showing the effect of the peptide of the present invention on the hRID as a water-soluble enhancing fusion partner and a graph (B) showing a change in the relative expression amount.
- FIG. 5 is a graph showing the effect of the hRID fusion with the peptide of the present invention on the expression efficiency of a target protein.
- FIG. 6 is a schematic diagram showing the structure of a recombinant expression vector for producing water-soluble norovirus according to an embodiment of the present invention.
- FIG. 7a shows the results of SDS-PAGE of the VP1 protein expressed in accordance with an embodiment of the present invention.
- VP1 70 kDa
- MSAVKAA-RID MSAVKAA-RID
- Example VP1 with recombined MSEQ-RID: 69 kDa
- FIG. 7b shows the expression of VP1 (70 kDa) in which MSAVKAA-RID was recombined in the left panel as a result of SDS-PAGE analysis of soluble expression of VP1 protein expressed according to an embodiment of the present invention.
- the expression of VP1 (70 kDa) in which RID was recombined is shown in the right panel as a result of the control (MS-RID).
- FIG. 8 is a chromatogram result obtained by purifying VP1 protein expressed by nickel affinity chromatography according to an embodiment of the present invention.
- FIG. 9 shows the result of pooling the fractions of 18 to 20 lane by SDS-PAGE after purifying the expressed VP1 protein according to an embodiment of the present invention.
- Figure 11 shows peptide mapping and N-terminal and C-terminal amino acid sequence analysis results to confirm that the protein obtained through expression and purification is composed of the VP1 sequence
- Figure 11a is the UPLC peak analyzed after tryptic treatment, Analysis of the peptide fragment in the trypsin treatment by LC-MS / MS showed that 83.9% of the amino acid sequence was consistent with the original sequence.
- Fig. 11c shows that the N-terminal sequence was consistent with norovirus VP1
- Fig. 11D shows the result of confirming that the C-terminal sequence matches the Norovirus VP1.
- 12A is a chromatogram showing a result of performing size exclusion chromatography to purify a VLP formed after cleavage with a TEV protease.
- FIG. 12B shows the result of S-PAGE of the purified VLP protein after cleavage with TEV protein cleaving enzyme.
- FIG. 13 shows the result of analysis through DLS (Dynamic Light Scattering) to check the overall diameter of the purified VLP.
- FIG. 14 shows the results of TEM microarray analysis of whether or not the purified VP1 protein forms VLP.
- A Virus-like particle from Escherichia coli confirmed by electron microscope
- B histidine, RID Recombinant VP1 protein without tag removal (failed to form VLP structure)
- C Norovirus VLP produced by baculovirus-insect cell system.
- D wild type norovirus virion.
- Protein solubility and folding enhancement by interaction with RNA, PLoS ONE (2008), 3: e2677) were used as expression vectors for pGE-LysRS.
- pGE-LysRS is regulated by the T7 promoter and the LysRS gene is cut out using one of the cleavage sites in Nde1 and MCS (Kpn1-BamH1-EcoRV-Sal1-Hind3) and EGFP or hRID at that position, or Other proteins were inserted.
- the amino acid sequence (eet1) of SEQ ID NO: 1 or a part thereof (eet2, SEQ ID NO: 2) was inserted at the N-terminal position of the inserted protein.
- the target proteins to be expressed were inserted using the prepared hRID, or two cleavage enzyme sites in the MCS of the amino acid-containing hRID vector of SEQ ID NO: 1.
- the prepared protein expression vector was transformed into BL21 (DE3), BL21 (DE3) -pLysS, or BL21 (DE3) -pLysE competent cells and cultured. All transformed E. coli were cultured in LB medium containing 50 ⁇ g / ml of ampicillin, and E. coli transformed with BL21 * (DE3) -pLysS or BL21 * (DE3) -pLysE had 34 ⁇ g / ml And cultured in a medium supplemented with chloramphenicol. The incubation temperature varies from protein to protein and was cultured at 33 to 37 ° C.
- IPTG is added at a level of 0 ⁇ M to 1 mM to activate the T7 promoter, and then IPTG is added at 33 ° C. or 37 ° C. for 3 Time.
- the well-cultured E. coli was centrifuged and the supernatant was removed and stored.
- 0.3 ml of PBS was added to 5 ml of the LB medium to produce E. coli, and lysate was prepared by sonication.
- 60 ⁇ l of B-PER (Thermo Fisher Scientific) was treated with appropriate concentrations of DNAase (DNase) and lysozyme in 1 ml of E. coli harvest to obtain lysates.
- the lysate was then analyzed by SDS-PAGE.
- SEQ ID NO: 3 coding for the amino acid sequence (eet1) of SEQ ID NO: 1 at the N-terminus of the EGFP gene sequence and the EGFP gene sequence at that position, using the Nde1 and Hind3 restriction enzymes in the pGE LysRS plasmid, Two additional fusion sequences (eet1-EGFP) were inserted.
- the vector is expressed by the T7 promoter and is regulated by the lac operator and regulated by IPTG.
- Two recombinant plasmids were transformed into BL21 * (DE3) -pLysE competent cells, respectively, and the protein was expressed at 37 ° C for 3 hours. At this time, IPTG was treated at four concentrations of 0, 20, 40 and 80 ⁇ M.
- Fluorescence values were measured at 485 nm / 520 nm using Fluostar Optima in the form of a lysate of EGFP expressed in each condition in order to confirm the activity of the expressed EGFP protein.
- EGFP fusion protein was expressed in the same manner as in Example 1 to confirm the effect of fusing a partial sequence (eet2, SEQ ID NO: 2) of the peptide (eet1) identified in Example 1 to the target protein.
- a gene SEQ ID NO: 6 encoding the amino acid sequence (MSEQHAQ) derived from Lysyl tRNA synthetase shown in SEQ ID NO: 5 was used.
- MSEQHAQ amino acid sequence
- the expression level of the EGFP protein (eet1-EGFP, eet2-EGFP) to which the novel peptide of the present invention was added was higher than that of the control protein (MSEQHAQ-EGFP) It was confirmed to be small.
- the IPTG concentration of 40 ⁇ M or more was fused with eet1 or eet2, the amount of active protein was found to be larger.
- TruB protein which is known to be poorly expressed in E. coli
- a total of four recombinant plasmids were transformed into BL21 * (DE3) -pLysS competent cells and expressed at 37 ° C. At this time, IPTG was treated at a concentration of 1 mM and cultured for 3 hours.
- hRID protein SEQ ID NO: 7
- SEQ ID NO: 8 a fusion sequence in which a gene encoding the hRID protein (SEQ ID NO: 8) and a gene encoding eet1 were linked to the N-terminus of hRID was inserted into the pGE LysRS plasmid.
- Two recombinant plasmids were transformed into BL21 * (DE3) -pLysS competent cells and expressed at 37 ° C. At this time, IPTG was treated at 0, 20, 100 and 1000 ⁇ M concentration and cultured for 3 hours.
- the expression of the fusion sequence (eet1-hRID) to which eet1 was added was confirmed to be well expressed (Fig. 4A) although the control group (hRID) hardly expressed.
- the expression level of the control group was too low to be standardized, and the expression level was compared based on the experimental group in which 1000 ⁇ M of IPTG was used (FIG. 4B).
- HRID was used as a fusion partner to increase the solubility and solubility of CsTA1953, CsTA37, and CsTA422 proteins, which are not expressed well in E. coli and which are not well expressed in water.
- LysRS was cut out using Nde1 and Kpn1 in the pGE LysRS plasmid and the gene sequence (SEQ ID NO: 8) coding for hRID or the gene sequence (SEQ ID NO: 10) coding for the eet1-hRID fusion protein was inserted at the position.
- CsTA1953 gene, CsTA37 and CsTA422 genes were inserted into pGE-hRID plasmid and pGE-eet1-hRID plasmid using BamH1 and Hind3, respectively.
- VP1 gene derived from Norovirus Hu / GII.4 / Hiroshima / 55/2005 / JPN (NCBI access number: AB504310.1) was used for the production of Norovirus VLP through E. coli.
- the pGE-LysRS vector was used as an expression vector and the above vector was an expression vector prepared by modifying pGEMEX-1 (Promega) vector. Specifically, NdeI and BamHI restriction enzymes were digested and digested.
- coli host HMS174 (DE3).
- 1 ml of Escherichia coli cultured on the previous day in 15 ml of LB medium containing the same concentration of ampicillin was cultured in a 15 ⁇ g / ml LB medium containing 50 ⁇ g / ml of ampicillin at 37 ° C. for one day And incubated at 37 ° C until OD 600 nm reached 0.5-0.7.
- Overexpression was induced with 1 mM IPTG when the OD reached the optimum value. After the addition of IPTG, expression was induced at various temperatures (37 ° C, 16 ° C).
- Norovirus VP1 conjugated with RID containing the four amino acids used in the previous study was also expressed under the same conditions. Expressed proteins were collected and SDS-PAGE was used to confirm the water solubility.
- the recombinant VP1 protein was well expressed at 16 ° C as well as at 37 ° C.
- the expression level of the recombinant VP1 of the present invention was remarkably increased to about two times or more as compared with the VP1 of the comparative example (Fig. 7A).
- the size of VP1 protein was 59 kDa and the size of VP1 containing RID (8 kDa) was about 70 kDa.
- Fig. 7B it was confirmed that the VP1 protein was not expressed in the control group fused with MS-RID, and that the expression level of eet1 was similar to that of VP1 when fused with eet2.
- Proteins identified as soluble were purified via nickel (Ni) affinity chromatography. Using the same method as above, 3 ml and 50 ml were used to finally express 500 ml of Escherichia coli, followed by harvesting and purification. Specifically, the first equilibrium and equilibrium Ni-NTA column (GE 50 mM Tris-HCl (pH 7.5), 300 mM sodium chloride, 5% glycerol, 0.1 mM 2-mercaptoethanol, Healthcare Life Sciences, Little Chalfont, Buckinghamshire, UK).
- Ni nickel affinity chromatography
- a linear gradient imidazole in the range of 10 to 300 mM was eluted using B buffer [50 mM Tris-HCl (pH 7.5), 300 mM sodium chloride, 5% glycerol, 0.1 mM 2-mercaptoethanol, and 300 mM imidazole]
- B buffer [50 mM Tris-HCl (pH 7.5), 300 mM sodium chloride, 5% glycerol, 0.1 mM 2-mercaptoethanol, and 300 mM imidazole]
- C buffer storage buffer
- concentration of the purified protein was quantified using BSA (Amresco, Solon, OH, USA).
- the purified VP1 protein was mixed at a ratio of 1: 1 with 20% glycerol and stored at -20 ° C.
- FIG. 8 The results of confirming the MSAVKAA-RID-VP1 fusion protein purified by nickel affinity chromatography and confirming the purification through SDS-PAGE are shown in FIG. 8 and FIG.
- a conjugate protein containing MSAVKAA-RID through TEV protease was also successfully removed. Thereafter, TEV, cleaved tag, and uncleaved-fusion protein were separated through 2 nd Ni-affinity chromatography and fully purified VP1 was obtained (FIG. 10).
- the fused protein was cleaved at 16 °C for one day with AcTEV protein cleaving enzyme.
- the column was subjected to equilibrium with a buffer [Ammonium acetate 250 mM (pH 6.0)], and after the completion of equilibrium, the VP1 sample in which the fusion partner protein was cleaved was loaded and purified. After purification, calibration was carried out on chromatograms using ferritin (440 kDa), aldolase (158 kDa), conalbumin (75 kDa), ovalbumin (44 kDa), bluesdextran 2000 (GE Healthcare) The peak molecular weight of the protein was determined.
- Norovirus VLP has a molecular weight of 10 MDa and that the maximum purification limit of our column is 800 kDa, so it is assumed that VLP will be purified in Void when properly formed.
- a high peak appeared as VLP in the void FOG. 12A
- the purified fractions were confirmed by SDS-PAGE and the peak in the void of the chromatogram corresponds to VLP (Fig. 7B).
- hRBD truncated by TEV protein cleavage enzyme was also purified through chromatography.
- VLP virus-like particles
- Voids were observed with an electron microscope to confirm that the purified VP1 protein formed VLPs.
- Purified Norovirus VLP was first placed on a copper grid for 1 min and stained with 2% uranyl acetate for 15 sec. The pre-treated samples were dried at room temperature for 30 minutes and then photographed using a transmission electron microscope (TEM, JEM-1011, JEOL, Japan). The above experiment was carried out by the Research Support Department of the Life Research Institute of Yonsei University College of Medicine.
- Fig. 14 it was confirmed that the purified VP1 protein forms VLPs.
- the diameter of the identified VLP was 34 nm and was similar to the diameter of Norovirus VLP and wild-type Norovirus produced using the baculovirus-insect cell expression system.
- VP1 fused with hRBD without protein cleavage by TEV protein cleavage enzyme does not form VLP and coagulates (Fig. 14).
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Abstract
Description
Claims (16)
- 목적 단백질의 N-말단에 결합되고 서열번호 1로 표시되는 아미노산 서열 또는 이의 일부 서열을 포함하는 것을 특징으로 하는 목적 단백질의 발현 효율을 증진시키기 위한 펩타이드.
- 제1항에 있어서,상기 서열번호 1의 아미노산 서열은 요산산화효소(urate oxidase)로부터 유래한 것을 특징으로 하는 펩타이드.
- 제1항에 있어서,상기 펩타이드는 서열번호 2로 표시되는 아미노산 서열을 포함하는 것을 특징으로 하는 펩타이드.
- 제1항에 있어서,상기 목적 단백질은 항원, 항체, 세포수용체, 효소, 구조 단백질, 혈청 및 세포 단백질로 이루어진 군으로부터 1종 이상 선택되는 것을 특징으로 하는 펩타이드.
- 제1항 내지 제3항 중 어느 한 항에 따른 펩타이드를 코딩하는 폴리뉴클레오티드.
- 제5항에 있어서,상기 폴리뉴클레오티드는 서열번호 3 또는 서열번호 4로 표시되는 서열인 것을 특징으로 하는 폴리뉴클레오티드.
- 목적 단백질을 코딩하는 폴리뉴클레오티드; 및상기 목적 단백질을 코딩하는 폴리뉴클레오티드의 5`-말단에 결합된 제1항 내지 제3항 중 어느 한 항에 따른 펩타이드를 코딩하는 폴리뉴클레오티드;를 포함하는 발현벡터.
- 제7항에 있어서,상기 목적 단백질은 노로바이러스 유래 VP1 단백질인 것을 특징으로 하는 발현벡터.
- 제7항에 따른 발현벡터로 형질전환된 숙주세포.
- 제9항에 있어서,상기 숙주세포는 대장균(E. coli)인 것을 특징으로 하는 숙주세포.
- 목적 단백질의 N-말단에 결합되고 서열번호 1로 표시되는 아미노산 서열 또는 이의 일부 서열을 포함하는 펩타이드; 및상기 펩타이드의 융합파트너로서 RID(RNA interacting domain)를 포함하는 것을 특징으로 하는, 목적 단백질의 발현 효율 및 수용성을 증진시키기 위한 융합 단백질.
- 제11항에 있어서,상기 RID는 서열번호 7로 표시되는 아미노산 서열을 포함하는 것을 특징으로 하는 융합 단백질.
- 제11항에 있어서,상기 융합 단백질은 서열번호 9로 표시되는 아미노산 서열을 포함하는 것을 특징으로 하는 융합 단백질.
- 제11항에 있어서,상기 목적 단백질은 노로 바이러스 유래 VP1 단백질인 것을 특징으로 하는 융합 단백질.
- 목적 단백질을 코딩하는 폴리뉴클레오티드; 및상기 목적 단백질을 코딩하는 폴리뉴클레오티드의 5'-말단에 결합된 제10항 내지 제13항 중 어느 한 항에 따른 융합 단백질을 코딩하는 폴리뉴클레오티드를 포함하는 발현 벡터.
- (A) 목적 단백질을 코딩하는 폴리뉴클레오티드 및 상기 폴리뉴클레오티드의 5'-말단에 결합된 목적 단백질의 발현 효율을 증진시키는 펩타이드 및 수용성을 높여 주는 RID를 코딩하는 폴리뉴클레오티드를 포함하는 발현 벡터를 제조하는 단계;(B) 상기 발현 벡터를 숙주세포에 도입하여 형질전환체를 제조하는 단계: 및(C) 상기 형질전환체를 배양하여 재조합 목적 단백질의 발현을 유도하고, 이를 수득하는 단계를 포함하는 수용성 목적 단백질의 생산 방법.
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