WO2015163037A1 - 産卵低下症候群(eds)予防ワクチン - Google Patents
産卵低下症候群(eds)予防ワクチン Download PDFInfo
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Definitions
- the present invention relates to a vaccine for preventing EDS of chickens. More specifically, a recombinant protein in which a “knob region” and a “polypeptide having a coiled coil-forming unit” in the fiber protein of EDS virus (EDSV), which is the etiology of EDS, are fused and / or a large amount thereof. It is a vaccine with the body as an active ingredient.
- EDSV EDS virus
- EDS is a chicken disease mainly characterized by decreased egg production and abnormal egg production from EDSV-infected chickens (Non-Patent Document 1 and Non-Patent Document 2).
- EDSV is classified as a group III avian adenovirus, has hemagglutination activity and is characterized by growth in chicken oviducts.
- EDS has no clinical symptoms or mild diarrhea, but occurs frequently at 30 to 40 weeks of age at the peak of spawning. In infected flocks, production of abnormal eggshell eggs and decreased egg production for 3 to 8 weeks The economic damage is very large. Because vaccines are effective for prevention (Non-Patent Document 3), inactivated vaccines are widely incorporated into egg collection chicken vaccination programs.
- the mainstream is an inactivated virus that has been propagated in developing duck eggs and then mixed with an adjuvant.
- the growth of EDSV in the developing duck egg is good (Non-patent Documents 4 and 5), but the supply of the developing duck egg may be difficult due to the occurrence of infectious diseases such as avian influenza.
- Non-Patent Document 6 has a double-stranded genomic DNA of about 33 kb
- Non-Patent Document 7 has a single serotype, and has little difference in antigenicity between strains
- the virus particle is composed of a core protein, a hexon constituting a capsid, a trimeric fiber protruding from the capsid as a fibrous protrusion, and a structural protein such as a penton base (Non-Patent Document 1 and Non-patent Document 1).
- Patent Document 6 ).
- Non-patent Document 8 neutralization epitopes are present in hexon (Non-patent document 8), fiber and penton base (Non-patent document 9), among which fiber is involved in entry into host cells (Non-patent document 10).
- Non-patent Document 11 Fiber proteins are divided into three regions by function (Non-patent Document 12). The N-terminal side involved in the connection with the penton base (Non-Patent Document 13) is called the tail, and the middle region is called the shaft. Knob present at the C-terminus has a hemagglutination activity and is reported to be involved in binding to cell receptors (Non-patent Document 11).
- Non-Patent Document 14 For human adenovirus type 5, among the three regions of the fiber protein, the neutralization epitope is knob, but the three-dimensional structure is important for its function, and it is expressed together with a part of the adjacent shaft region. It has been reported that the binding activity to the receptor was shown by making it (Non-Patent Document 14).
- the shaft region constituting the axis of the fiber protein has a repeat structure (non-patent document 12 and non-patent document 15) in which a plurality of ⁇ -helical structures (1 repeat) composed of a hydrophobic region sandwiching proline or glycine are connected, In addition, three molecules are associated to form a triple ⁇ helical structure (Non-patent Documents 15 and 16). Knob following the shaft also has a trimer structure (Non-patent Document 17). Normally, one repeat of the shaft consists of 15 amino acids (Non-patent Document 12), but in the case of EDSV, most repeats are composed of more amino acids (Non-patent Document 6). In human adenovirus, it has been reported that when the shaft length is shortened, the binding to the receptor and the infectivity to cultured cells are reduced (Non-patent Document 18).
- the problem to be solved by the present invention is to provide a recombinant EDS vaccine capable of effectively preventing EDS against a farm where EDS is expected to occur.
- the present inventors first studied the structure of the fiber protein of EDSV using a structure prediction model. As a result, the boundary between the knob region and the shaft region is N-terminal side from the conventionally considered position. I found out that it exists.
- a recombinant protein and / or multimer thereof in which a knob region defined not to include a shaft region is fused with a polypeptide having a coiled coil forming unit induces high HI antibodies by inoculating chickens as a vaccine. As a result, the present invention has been completed.
- the present invention is as follows.
- a fusion protein in which a polypeptide having a coiled-coil forming unit and a knob region in an EDSV fiber protein are combined.
- a fusion protein in which the polypeptide having the coiled coil forming unit is GCN4 or cartilage matrix protein (CMP).
- a fusion protein multimer obtained by multimerizing the fusion protein obtained by multimerizing the fusion protein.
- a nucleic acid fragment consisting of a DNA sequence encoding the fusion protein.
- a recombinant expression vector containing the nucleic acid fragment A recombinant expression vector containing the nucleic acid fragment.
- a transformant introduced with the nucleic acid fragment is A transformant introduced with the nucleic acid fragment.
- a transformant into which the recombinant expression vector has been introduced has been introduced.
- An antibody capable of binding to the fusion protein or a multimer thereof is an antibody capable of binding to the fusion protein or a multimer thereof.
- a vaccine for EDS containing the fusion protein as an active ingredient containing the fusion protein as an active ingredient.
- a therapeutic agent for EDS containing the antibody as an active ingredient.
- a DNA vaccine for EDS containing the nucleic acid fragment or recombinant expression vector as an active ingredient.
- a kit for measuring the content of the EDSV knob region in a test sample containing the antibody is provided.
- a method for preventing EDS wherein the fusion protein, multimer thereof, nucleic acid fragment or recombinant expression vector is administered to chickens.
- the EDS treatment method in which the antibody is administered to chickens.
- the vaccine of the present invention comprising a recombinant protein fused with a polypeptide having a EDSV knob region and a coiled coil forming unit and / or its multimer as an active ingredient induces high HI antibodies when inoculated into chickens. It is possible to prevent the development of EDS.
- FIG. 1 is a schematic diagram of fusion proteins prepared in Examples 1 to 4 and Comparative Example 1.
- FIG. 3 is an SDS-PAGE analysis diagram confirming the formation of multimers of the fusion proteins prepared in Examples 1 to 4 and Comparative Example 1.
- FIG. 2 is a graph showing an analysis of molecular weight distribution by gel filtration for the fusion proteins prepared in Examples 1 to 4 and Comparative Example 1.
- FIG. 6 is a view showing the results of HI test of chicken serum immunized with the fusion proteins prepared in Examples 1 to 4 and Comparative Example 1 in Test Example 3. It is a figure which shows the effective antigen amount confirmation test result of Knob-GCN4 in Test Example 4. It is a figure which shows the effective antigen amount confirmation test result of CMP-Knob in Test Example 4. It is a figure which shows transition (average value) of the anti- EDSV HI antibody titer after immunization in Test Example 5. It is a figure which shows transition of the normal egg-laying number after the highly toxic EDSV infection in Ex
- the present invention includes a fusion protein in which a polypeptide having a coiled coil forming unit and a knock region in a fiber protein of chicken EDSV are bound.
- EDSV fiber protein is divided into three regions from the N-terminal side, tail (Tail), shaft (Shaft), and knob (Knob), depending on its function. It is preferable that the shaft region is not included in the knob region of EDSV constituting the fusion protein of the present invention because the solubility may be lowered. On the other hand, since the natural higher order structure of the knob region may be impaired, it is preferable to completely include the knob region.
- An example of such an EDSV knob region is a polypeptide comprising the amino acid sequence represented by SEQ ID NO: 11. This amino acid sequence includes 9 amino acids on the N-terminal side that were conventionally included in the shaft region (Non-Patent Document 20). It was predicted to be a knob region.
- a polypeptide comprising the amino acid sequence represented by SEQ ID NO: 11 and an amino acid sequence in which one or several amino acids have been deleted, substituted or added in this amino acid sequence Is included.
- severeal amino acids generally refers to 2 to 9, preferably 2 to 5, and more preferably 2 to 3 amino acids.
- a polypeptide comprising an amino acid sequence having homology with these amino acid sequences of 80% or more, preferably 90% or more, more preferably 95% or more is also included.
- the DNA sequence of SEQ ID NO: 12 a DNA sequence optimized for codon expression in E. coli and yeast, and an appropriate restriction enzyme cleavage site were added to these DNA sequences. Also included are DNA sequences and DNA sequences in which one or several bases have been deleted, substituted or added in these DNA sequences.
- the term “several bases” usually refers to 2 to 9, preferably 2 to 5, more preferably 2 to 3 bases.
- DNA sequences having homology with these DNA sequences of 80% or more, preferably 90% or more, more preferably 95% or more are also included.
- the polypeptide having a coiled-coil forming unit that binds to Knob and constitutes the fusion protein of the present invention is not particularly limited as long as it has the ability to form a coiled-coil structure, but a protein that forms a natural multimer ( Those having a coiled-coil forming unit derived from a multimer-forming protein) are preferred.
- the multimer-forming protein described in Non-Patent Document 21 (Adv. Protein Chem. 2005, 70, 37-78) is exemplified, but in particular, when it is a fusion protein with Knob, high yield is obtained as a soluble protein.
- GCN4 chicken-derived CMP, bacteriophage T4-derived fibritin, etc. are preferred, GCN4 and CMP are more preferred, and CMP is particularly preferred. .
- the polypeptide having a coiled-coil forming unit of GCN4 includes the amino acid sequence of SEQ ID NO: 27 that is a dimer type, the amino acid sequence of SEQ ID NOs: 28 to 30 that is a trimer type, and one or several amino acids in these amino acid sequences. Polypeptides comprising amino acid sequences deleted, substituted or added are also included. Furthermore, a polypeptide comprising an amino acid sequence having homology with these amino acid sequences of 80% or more, preferably 90% or more, more preferably 95% or more is also included. Among them, the trimer type is preferable, and a polypeptide consisting of the amino acid sequence of SEQ ID NO: 30 is particularly preferable.
- the polypeptide having a coiled coil forming unit of CMP includes an amino acid sequence represented by SEQ ID NO: 31 and a polypeptide comprising an amino acid sequence in which one or several amino acids are deleted, substituted or added in this amino acid sequence.
- a polypeptide comprising an amino acid sequence having homology with these amino acid sequences of 80% or more, preferably 90% or more, more preferably 95% or more is also included.
- Examples of the DNA sequence encoding a polypeptide having a coiled coil forming unit of CMP include the DNA sequence of SEQ ID NO: 32, the DNA sequence of SEQ ID NO: 33 and the like codon-optimized for expression in E. coli, and suitable for these DNA sequences.
- DNA sequences to which a restriction enzyme cleavage site has been added and DNA sequences in which one or several bases have been deleted, substituted or added in these DNA sequences are included.
- DNA sequences having homology with these DNA sequences of 80% or more, preferably 90% or more, more preferably 95% or more are also included.
- the polypeptide having a coiled coil forming unit such as GCN4 or CMP may be bound to either the N-terminal side or the C-terminal side of Knob.
- a coiled coil forming unit such as GCN4 or CMP
- CMP is used as the coiled coil forming unit
- a high HI antibody-inducing effect is exhibited regardless of whether it is bound to either the N-terminal side or C-terminal side of Knob.
- GCN4 is used, the effect of inducing HI antibody is higher when bound to the N-terminal side of Knob.
- a peptide having a coiled-coil forming unit and Knob may be bound adjacent to each other, but a spacer such as a linker sequence may be inserted between them for the purpose of reducing the interaction between the two molecules.
- the linker sequence is not particularly limited, and may be a sequence of the combination of example GPGP (GP) 2 or GGGGS (G 4 S). It can also be used as a linker sequence using a sequence ((G 4 S) 1 to (G 4 S) 4 ) in which (G 4 S) is repeated 1 to 4 times, and (GP) 2 may be combined. Alternatively, a Hisx6 (H 6 ) tag sequence may be used.
- Suitable linker sequences or tag and linker sequence combinations include (G 4 S) 1 , (G 4 S) 2 , (G 4 S) 2 H 6 (G 4 S) 2 , (G 4 S) 2 H 6 (G 4 S) 1 (G 3 S) 1 etc. can be illustrated.
- the tag sequence may be added to the N-terminus or C-terminus of the fusion protein.
- fusion protein of the present invention for example, a polypeptide having a coiled-coil forming unit of GCN4 is added to the C-terminal side of Knob, a linker sequence ((G 4 S) 2 ) is inserted between them, and the C-terminal is inserted.
- linker sequence (G 4 S) 2
- Examples include fusion protein Knob-GCN4 (for example, SEQ ID NO: 13 (amino acid sequence), SEQ ID NO: 14 (DNA sequence)) to which a tag sequence (H 6 ) is bound.
- a polypeptide having a coiled coil forming unit of GCN4 was placed on the N-terminal side of Knob, a linker sequence ((G 4 S) 1 ) was inserted between them, and a tag sequence (H 6 ) was bound to the C-terminus
- the fusion protein GCN4-Knob (for example, SEQ ID NO: 21 (amino acid sequence), SEQ ID NO: 22 (DNA sequence)) is exemplified.
- the fusion protein of the present invention includes not only a protein represented by the amino acid sequence of SEQ ID NO: 13 or 21, but also a polypeptide comprising an amino acid sequence in which one or several amino acids are deleted, substituted or added in these amino acid sequences. Is included.
- a polypeptide comprising an amino acid sequence having a homology with these amino acid sequences of 80% or more, preferably 90% or more, more preferably 95% or more is also included.
- a polypeptide having a coiled coil forming unit of CMP is bound to the C-terminal side of Knob, and a tag sequence (H 6 ) and a linker sequence ((G 4 S) 2 ) are interposed between them.
- An inserted fusion protein for example, SEQ ID NO: 23 (amino acid sequence), SEQ ID NO: 24 (DNA sequence)
- a polypeptide having a coiled-coil forming unit of CMP is bound to the N-terminal of Knob
- a tag sequence and A fusion protein in which a combination of linker sequences ((G 4 S) 2 H 6 (G 4 S) 1 (G 3 S) 1 ) is inserted (for example, SEQ ID NO: 25 (amino acid sequence), SEQ ID NO: 26 (DNA sequence)) are also illustrated.
- the fusion protein of the present invention includes not only the protein represented by the amino acid sequence of SEQ ID NO: 23 or 25 but also a polypeptide comprising an amino acid sequence in which one or several amino acids are deleted, substituted or added in these amino acid sequences Is included.
- a polypeptide comprising an amino acid sequence having a homology with these amino acid sequences of 80% or more, preferably 90% or more, more preferably 95% or more is also included.
- a method is exemplified in which an expression vector is prepared so that the DNA sequence of the coiled coil forming unit and the Knob DNA sequence are adjacent to each other and then introduced into a suitable host to express the fusion protein.
- the DNA sequence of the coiled-coil forming unit may be arranged on the 5 'side or 3' side of the Knob DNA sequence.
- the DNA sequence of the linker sequence and / or the tag sequence may be inserted between the DNA sequence of the coiled coil forming unit and the DNA sequence of Knob, and 5 ′ of the above DNA sequence.
- a method of preparing an expression vector by arranging from the 5 'side with a Knob DNA sequence, a tag sequence and / or a linker sequence DNA sequence, and a coiled coil forming unit DNA sequence is exemplified.
- the above DNA sequence can be obtained by chemical synthesis, amplified by a known gene amplification method using it as a template, and incorporated into an expression vector using various restriction enzymes to prepare a recombinant expression vector.
- the oligonucleotide used for gene amplification is preferably designed to hybridize to the 5 'side or 3' side of the template DNA sequence, and is preferably added with a cleavage site by a restriction enzyme.
- the template DNA can be amplified by a known gene amplification method using the above-mentioned oligonucleotide, template DNA, DNA polymerase or the like.
- the amplified DNA sequence and the expression vector are treated with a restriction enzyme, they are combined with an appropriate DNA ligase, whereby a recombinant expression vector into which the target DNA sequence has been inserted can be constructed.
- the present invention also includes such recombinant expression vectors.
- expression vectors include plasmid vectors, phage vectors, virus vectors, artificial chromosome vectors, and the like, but plasmid vectors are preferred from the viewpoint of easy handling and cost.
- plasmid vectors are preferred from the viewpoint of easy handling and cost.
- the host is E. coli, pFN6A (HQ) Flexi Vector (Promega), pFN7A (HQ) Flexi Vector (Promega), pFN2A (GST) Flexi Vector (Promega), pET-15b (MERCK), pET-21d (MERCK), pUC57 (GenScript), pET-22b (MERCK), pET-21d (MERCK), pCold vector (Takara Bio), etc.
- the expression vector may contain a replication origin, a regulatory sequence such as a promoter sequence having a regulatory role in gene expression, an enhancer sequence, and the sequence of a selectable marker.
- bacterial promoters are E. coli lacI and lacZ promoters, T3 and T7 promoters, gpt promoter, lambda PR, PL promoter, tac promoter, and trp, trc promoter.
- CMV cytomegalovirus
- HSV herpes simplex virus
- SV 40 promoter examples include promoters of the retrovirus Long Terminal Repeat (LTR), such as the promoter of Rous sarcoma virus (“RoSV”), and metallothionein promoters such as the metallothionein-I promoter.
- LTR retrovirus Long Terminal Repeat
- RoSV Rous sarcoma virus
- metallothionein promoters such as the metallothionein-I promoter.
- transcriptional activity may be increased by inserting an enhancer sequence into the expression vector.
- Enhancer sequences act to increase the transcriptional activity of a promoter in a given host cell type. Examples of enhancers include SV40 enhancer, CMV early promoter enhancer, polyoma enhancer behind replication origin, ⁇ -actin enhancer, adenovirus enhancer and the like.
- selection markers include the ampicillin resistance gene of Escherichia coli, the trp1 gene of Saccharomyces cerevisiae, and the neomycin resistance gene of mammalian cells.
- the present invention includes a nucleic acid fragment containing the DNA sequence of the coiled coil forming unit and the Knob DNA sequence, which encodes the fusion protein of the present invention.
- the nucleic acid fragment of the present invention is a nucleic acid fragment in which the DNA sequence of the coiled-coil forming unit and the DNA sequence of Knob are arranged successively, or a tag sequence and / or a linker sequence between the DNA sequence of the coiled-coil forming unit and the DNA sequence of Knob A nucleic acid fragment having the DNA sequence inserted therein.
- the nucleic acid fragments of SEQ ID NOs: 14, 24, 26 and 28 are included.
- the entire nucleic acid fragment of the present invention can be obtained by chemical synthesis. Further, after obtaining a part of the nucleic acid fragment and the remaining part of the nucleic acid fragment by chemical synthesis, they may be linked by a known gene recombination technique. For example, after chemically synthesizing DNA sequences of Knob or coiled coil forming units, they are amplified using a known gene amplification method and then inserted into separate cloning vectors. A Knob DNA sequence or a coiled coil forming unit DNA sequence is excised from each cloning vector with a restriction enzyme, and then inserted into an expression vector treated with the same restriction enzyme to produce a recombinant expression vector.
- an expression vector may be prepared by inserting a DNA sequence of a tag sequence or a linker sequence between a coiled coil forming unit and a Knob DNA sequence to prepare a nucleic acid fragment.
- a transformant containing the expression vector can be obtained by transforming the host with the expression vector prepared as described above. Such transformants are also included in the present invention.
- the host include known ones such as Escherichia coli, yeast, mammalian cell lines, insect cells, and plants.
- E. coli include BL21 strain and DH5 ⁇ .
- yeast include Pichia pastoris and Saccharomyces cerevisiae.
- mammalian cells include CHO cells, HEK293 cells, and COS-1 / -7 cells.
- the introduction of the expression vector into the host can be performed by a known method depending on the host, and examples thereof include a calcium phosphate method, an electroporation method, and a lipofection method.
- a transformant having the expression vector introduced into a host cell can be selected by culturing in a medium containing a selection marker.
- the selected promoter is induced under specific conditions (pH, temperature, addition of compound) to produce a fusion protein. Can do.
- the expressed fusion protein accumulates inside the cell or is secreted outside the cell.
- the fusion protein may be expressed in the inclusion body fraction. Examples of methods for recovering inclusion bodies from E. coli include ultrasonic disruption, high-pressure homogenizer, and BugBuster (Merck).
- the fusion protein of the present invention thus obtained can be used as a monomer, but is preferably used as a multimer because it can induce high HI antibodies.
- Such fusion protein multimers are, for example, dimers, trimers, trimers or more, and mixtures of these multimers are also included.
- a fusion protein when a fusion protein is expressed using GCN4, CMP or the like as a polypeptide having a coiled coil forming unit, it is obtained as a multimer, but a known refolding treatment may be performed if necessary.
- the fusion protein of this invention couple
- a method of individually expressing a polypeptide having a coiled coil forming unit and Knob and binding them using a crosslinker is exemplified.
- each DNA sequence is obtained by chemical synthesis, amplified using a known gene amplification method as a template, and each expression plasmid is obtained by the above method. It is possible to build The expression plasmid can be introduced into a host as described above to obtain the target protein.
- a crosslinker When binding using a crosslinker, it can be linked using amino groups and thiol groups (SH groups) present in proteins, aldehyde groups of sugar chains present in proteins, etc.
- SH groups amino groups and thiol groups
- a method of reacting the SH group of a polypeptide having a coiled coil forming unit and the amino group of Knob can be exemplified, more specifically, a polypeptide reduced by a reducing agent such as dithiothreitol (DTT), It can be bound by incubating with Knob introduced with a pyridyl disulfide group with N-succinyl-3- (2-pyridyldithio) proprionate (SPDP). Furthermore, it can also chemically couple
- DTT dithiothreitol
- SPDP N-succinyl-3- (2-pyrid
- the fusion protein obtained by the above method and its multimer can be further isolated and purified by a general purification means.
- the purification means include various purification methods such as affinity chromatography, ion exchange chromatography, hydrophobic interaction chromatography, and gel filtration chromatography.
- the present invention includes an EDS vaccine comprising the above-described fusion protein and / or fusion protein multimer of the present invention as an active ingredient.
- the vaccine of the present invention preferably contains a fusion protein multimer. Preferred are dimers, trimers, trimers or more, or mixtures of these multimers.
- the vaccine for EDS preferably contains 0.3 to 10 ⁇ g of the fusion protein and / or fusion protein multimer per dose.
- the vaccine of the present invention may contain a pharmaceutically acceptable carrier.
- a pharmaceutically acceptable carrier examples include saline, buffered saline, dextrose, water, glycerol, isotonic aqueous buffers and combinations thereof, and addition of adjuvants, emulsifiers, preservatives, isotonic agents, pH adjusters, etc. You may mix
- Adjuvants include oil-based adjuvants, tocopherol acetate, alum, saponins (QS21, ISCOM), CpG oligos and the like.
- the vaccine of the present invention may be mixed with an antigen for preventing chicken infection in addition to the fusion protein.
- infectious diseases include Newcastle disease, chicken infectious bronchitis, infectious coryza, chicken infectious bursal disease, reovirus infection, mycoplasma infection, salmonella infection and the like.
- the vaccine of the present invention is transdermal, sublingual, ophthalmic, intradermal, intramuscular, oral, enteral, nasal, intravenous, subcutaneous, intraperitoneal, mouth to lung It can be administered by any route of administration such as inhalation administration.
- the present invention includes a kit for measuring the amount of antibody against the knock region of EDSV in a test sample containing the fusion protein and / or fusion protein multimer.
- the kit containing the fusion protein of the present invention may be a plate on which the fusion protein is immobilized.
- a test sample is applied to the plate, and the fusion protein on the plate reacts with the antibody contained in the test sample.
- a secondary antibody labeled with an enzyme or a fluorescent substance is applied to react with the primary antibody. If necessary, the amount of antibody contained in the test sample may be measured by adding a substrate for the enzyme and detecting the product of the enzyme reaction and the amount of fluorescence.
- the kit of the present invention is used for evaluating the effectiveness of a vaccine by detecting the presence or absence of production of antibodies derived from the vaccine after immunization of chickens with a vaccine comprising a fusion protein and / or a fusion protein multimer as an active ingredient. You can also.
- the present invention includes an EDS DNA vaccine comprising the above-described nucleic acid fragment or recombinant expression vector as an active ingredient.
- the nucleic acid fragment or the recombinant expression vector preferably contains a promoter sequence that allows the chicken to express the fusion protein after immunization.
- nucleic acid fragments and recombinant expression vectors that significantly reduced the symptoms associated with EDS were selected as active ingredients for EDS therapeutics.
- the amount of the active ingredient can be defined from the dose at that time.
- the DNA vaccine of the present invention may contain a pharmaceutically acceptable carrier.
- a pharmaceutically acceptable carrier examples include saline, buffered saline, dextrose, water, glycerol, isotonic aqueous buffers and combinations thereof.
- additives such as an adjuvant, an emulsifier, a preservative, an isotonic agent, and a pH adjuster can be appropriately blended therein.
- the DNA vaccine of the present invention is transdermal, sublingual, ophthalmic, intradermal, intramuscular, oral, enteral, nasal, intravenous, subcutaneous, intraperitoneal, oral It can be administered by any route of administration such as inhalation to the lung.
- the present invention includes an antibody that binds to the fusion protein and / or the fusion protein multimer.
- the usual immunization method (Current Protocols in Molecular Biology, Antibody Engineering: A PRACTICAL APPROACH Edited by J. McCAFFERTY et al. Or ANTIBODY ENGINEERING second edition Carriage Edited by AK) BORREBAECK) makes it possible to produce monoclonal and polyclonal antibodies, etc., or these human-type antibodies.
- antibody production technology using phage display technology Phage Display of Peptides and Proteins: A Laboratory Manual Edited by Brian K.
- the present invention includes an EDS therapeutic agent comprising the above antibody as an active ingredient.
- the therapeutic agent for EDS of the present invention may contain a pharmaceutically acceptable carrier containing the above antibody as an active ingredient.
- a pharmaceutically acceptable carrier containing the above antibody as an active ingredient. Examples include saline, buffered saline, dextrose, water, glycerol, isotonic aqueous buffers and combinations thereof, and addition of adjuvants, emulsifiers, preservatives, isotonic agents, pH adjusters, etc. You may mix
- the therapeutic agent for EDS of the present invention is transdermal administration, sublingual administration, eye drop administration, intradermal administration, intramuscular administration, oral administration, enteral administration, nasal administration, intravenous administration, subcutaneous administration, intraperitoneal administration, Administration may be performed by any route such as inhalation administration from the mouth to the lung.
- the present invention includes a kit that contains an antibody that binds to a fusion protein and / or a fusion protein multimer, and measures the content of the knob region of EDSV in a test sample.
- a kit in which an antibody that binds to a fusion protein is immobilized on a plate or the like.
- the kit containing the antibody of the present invention can also be used for evaluating the presence or absence of EDSV infection using Knob content as an index. For example, after applying a test sample to a plate on which the antibody is immobilized, an antibody labeled with an enzyme or a fluorescent dye is applied. After incubation and washing of the plate, if necessary, a chromogenic substrate is added and the amount of fluorescence can be measured to evaluate the Knob content in the test sample.
- Methods for labeling antibodies with enzymes and fluorescent dyes include EasyLink antibody conjugation kits (abcam), Lightning-Link Rapid Conjugation System (Innova Biosciences Ltd), Oyster Antibody Labeling Kit (Luminartis GmbH), and enzyme labeling kit EZ-Link (PIERCE Biotechnology), PlatinumLink Protein Labeling Kit (Kreatech Biotechnology BV), and DyLight Antibody Labeling Kit (PIERCE Biotechnology).
- the present invention includes a carrier for affinity chromatography in which an antibody against a fusion protein and / or a fusion protein multimer is bound to a carrier.
- the fusion protein and / or fusion protein multimer of the present invention is expressed inside and outside the host, and when expressed in the host, the host is destroyed and the fusion protein and / or fusion protein multimer is recovered, When expressed, the fusion protein and / or fusion protein multimer is recovered from the culture environment.
- the carrier of the present invention is expected to be used for recovering fusion proteins and / or fusion protein multimers from such contaminated fractions.
- Carriers include HiTrap NHS-activated HP (GE Healthcare), NHS-activated Sepharose 4 Fast Flow (GE Healthcare), CNBr-activated Sepharose 4B (GE Healthcare), CNBr-activated Sepharose 4 Fast Flow (GE Healthcare) ), EAH Sepharose 4B (GE Healthcare), ECH Sepharose 4B (GE Healthcare), Profinity Epoxy Resin (BIORAD), Affigel Hz Hydrozide Gel (BIORAD), and antibody binding by methods commonly used by those skilled in the art You may let them.
- Example 1 Preparation of Knob-GCN4 protein and multimer thereof
- Genomic DNA was extracted from EDSV KE-80 strain by the following method. After inoculating the virus into the allantoic cavity of a 9-day-old grower, the allantoic fluid collected on the 6th day is added to the pronase solution to which proteinase K (1 mg / ml) is added, and then at 50 ° C for 1 hour. The mixture was further shaken overnight at 37 ° C. Thereafter, deproteinization with phenol / chloroform, ethanol precipitation, and RNase A (Qiagen) treatment were performed to extract viral genomic DNA.
- the fiber protein knob region and 8 repeats A DNA fragment (SEQ ID NO: 6) encoding a part of the shaft region (SEQ ID NO: 5) was amplified by Polymerase Chain Reaction (PCR). This amplified DNA fragment and plasmid pET-15b (Merck Co., Ltd.) were cleaved with restriction enzyme NcoI and restriction enzyme XhoI, and then combined with DNA ligase. The ligation product was introduced into E.
- GCN4 trivalent coiled coil forming unit
- NCBI #: 1CZQ_A modified GCN4 protein
- (G 4 S) 2 -GCN4 modified GCN4 protein
- SEQ ID NO: 8 was designed and artificially synthesized. This synthetic DNA and plasmid pET-21d (Merck Co., Ltd.) were cleaved with restriction enzyme NcoI and restriction enzyme XhoI, and then ligated with DNA ligase. The ligation product was introduced into E. coli DH5 ⁇ , and the resulting plasmid was used as intermediate vector 2.
- pKNOB2 is a DNA sequence that encodes a polypeptide composed of Knob, (G 4 S) 2 linker sequence, GCN4 and Hisx6 (H 6 ) tag sequence (hereinafter, Knob-GCN4) (SEQ ID NO: 13) (FIG. 1) ( SEQ ID NO: 14).
- pKNOB2 was introduced into E. coli BL21 (DE3) (Merck Co., Ltd.) to obtain a Knob-GCN4-expressing E. coli KNOB2 strain.
- IPTG isopropyl- ⁇ -D-galactopyranoside
- the main culture was transferred to a centrifuge tube, and the cell pellet was collected by centrifugation at 8,000 rpm, 4 ° C, 30 minutes.
- Two tablets of Complete protease inhibitor cocktail (Roche) were added to 50 mL of BugBuster Master Mix (Novagen), and this was used as a cell disruption solution.
- the cell pellet was suspended in the cell disruption solution and incubated at room temperature for 60 minutes, and then ultrasonically disrupted (on ice, Output 4, Duty 70%, 10 minutes three times).
- the disrupted solution was centrifuged (15,000 rpm, 4 ° C., 30 minutes), and the supernatant (soluble fraction) was recovered.
- the recombinant antigen protein contained in the soluble fraction was purified using HisTrap HP, 5 ml column (GE Healthcare) according to the instructions attached to the column.
- a soluble fraction added with 20 mM (final concentration) imidazole is applied to the column, washed with a buffer containing 20 mM (final concentration) imidazole, and then washed with a buffer containing 500 mM (final concentration) imidazole. Elution was performed.
- the obtained elution fraction was concentrated with Amicon Ultra-15 10K (Millipore), and the buffer component was replaced with PBS by dialysis to obtain the Knob-GCN4 antigen.
- GCN4-Knob protein and multimers thereof (1) Construction of GCN4-Knob expression vector Sense primer (SEQ ID NO: 15) having NcoI recognition sequence and antisense strand primer having XhoI recognition sequence using intermediate vector 2 as template (SEQ ID NO: 16), a DNA fragment (SEQ ID NO: 18) encoding a polypeptide obtained by adding a (G 4 S) 1 linker sequence to GCN4 (hereinafter GCN4- (G 4 S) 1 ) (SEQ ID NO: 17) ) was amplified by PCR.
- DNA fragment encoding Knob (SEQ ID NO: 11) using the intermediate vector 1 as a template and a sense strand primer (SEQ ID NO: 19) having an XhoI recognition sequence and an antisense strand primer (SEQ ID NO: 20) having an XhoI recognition sequence (SEQ ID NO: 12) was amplified by PCR.
- pKNOB3 is a DNA sequence (SEQ ID NO: 1) that encodes a polypeptide composed of GCN4, (G 4 S) 1 linker sequence, Knob and histidine hexamer tag sequence (hereinafter GCN4-Knob) (SEQ ID NO: 21) (FIG. 1). 22) is included.
- GCN4-Knob SEQ ID NO: 21
- Knob-CMP protein Preparation of Knob-CMP protein and its multimer
- Knob, (G 4 S) 2 H 6 (G 4 S) 2 linker sequence, and CMP protein NCBI #: NP_001025546) 3
- Knob-CMP valence coiled coil forming unit
- a DNA sequence (SEQ ID NO: 24) was designed by adding an NdeI recognition sequence to the 5 'end and a BamHI recognition sequence to the 3' end, and further adding a protective base to the 5 'end and 3' end. Synthesized. Plasmid pUC57 (Genscript Co., Ltd.) cleaved with this synthetic DNA and restriction enzyme EcoRV was ligated with DNA ligase. The ligation product was introduced into E. coli DH5 ⁇ , and the resulting plasmid was used as intermediate vector 4. Intermediate vector 4 was cleaved with restriction enzyme NdeI and restriction enzyme BamHI to obtain a DNA fragment encoding Knob-CMP.
- Example 4 Preparation of CMP-Knob protein and its multimer (1) Construction of CMP-Knob9 expression vector Consists of CMP, (G 4 S) 2 H 6 (G 4 S) 1 (G 3 S) 1 linker sequence, and Knob In order to express a polypeptide (hereinafter CMP-Knob) (SEQ ID NO: 25) (Fig. 1) in E. coli, the codon of the DNA sequence encoding it is optimized and cloned into an expression vector.
- a DNA sequence (SEQ ID NO: 26) in which an NdeI recognition sequence and a BamHI recognition sequence at the 3 ′ end were added, and a protective base at the 5 ′ end and 3 ′ end was added was designed and artificially synthesized.
- Plasmid pUC57 (Genscript Co., Ltd.) cleaved with this synthetic DNA and restriction enzyme EcoRV was ligated with DNA ligase.
- the ligation product was introduced into E. coli DH5 ⁇ , and the resulting plasmid was used as intermediate vector 5.
- Intermediate vector 5 was cleaved with restriction enzyme NdeI and restriction enzyme BamHI to obtain a DNA fragment encoding CMP-Knob.
- This DNA fragment and the plasmid pET-11a (Merck Co., Ltd.) cleaved with the restriction enzymes NdeI and BamHI were ligated with DNA ligase.
- the ligation product was introduced into E.
- pKNOB5 was introduced into E. coli BL21 (DE3) (Merck Co., Ltd.) to obtain a CMP-Knob expressing E. coli KNOB5 strain.
- pKNOB1 was introduced into E. coli BL21 (DE3) (Merck Co., Ltd.) to obtain a Knob-expressing E. coli KNOB1 strain.
- Test example 1 About 5 types of recombinant antigen proteins (Knob, GCN4-Knob, Knob-GCN4, CMP-Knob, Knob-CMP) purified in Examples 1 to 4 and Comparative Example 1 using BCA Protein Assay Kit (Pierce) Quantification was performed. The results are shown in Table 1.
- Test example 2 Characterization of recombinant protein: SDS-PAGE analysis was performed on the five recombinant antigen proteins (Knob, GCN4-Knob, Knob-GCN4, CMP-Knob, Knob-CMP) purified in Examples 1 to 4 and Comparative Example 1. Recombinant antigen protein is mixed with a sample buffer that does not contain a reducing agent. -A glycine gel (Atto, E-R12.5L) was applied and energized at 10 mA for 130 minutes. CBB staining was performed using Ez Stain Aqua (Atto, AE-1340).
- Test example 3 Immunogenicity evaluation of recombinant antigen (hemagglutination inhibition test (HI test)): HI antibodies induced by immunizing chickens against the five types of recombinant antigen proteins (Knob, GCN4-Knob, Knob-GCN4, CMP-Knob, Knob-CMP) purified in Examples 1 to 4 and Comparative Example 1 The value was measured.
- the recombinant antigen protein was mixed and prepared with an oil-based adjuvant (mixed with light liquid paraffin, sorbitan monooleate, and polysorbate 80) so that the recombinant antigen protein would be 10 ⁇ g / 0.5 mL in terms of Knob.
- EDSV As a control vaccine, EDSV (EB66) which is an antigen of EDS vaccine commercially available from Kakenken was used. EDSV cultured in EB66 cells was mixed and prepared with an oily adjuvant (mixed with light liquid paraffin, sorbitan monooleate, and polysorbate 80) so that the concentration was 10 6.7 TCID 50 /0.5 mL or more. The prepared vaccine was inoculated into the leg leg muscle of 29-day-old SPF chicken by 0.5 mL intramuscular injection. Seven weeks after immunization, blood was collected from chickens, and the collected serum was subjected to HI test.
- oily adjuvant mixed with light liquid paraffin, sorbitan monooleate, and polysorbate 80
- the HI antibody titer was determined from the hemagglutination image after adding 0.05 mL of suspended 0.5% chicken erythrocytes, mixing and reacting at room temperature for 1 hour. As a result of the test, HI antibody titer induced by 3 types of recombinant protein antigens, GCN4-Knob, CMP-Knob, and Knob-CMP, is improved. ( Figure 4).
- Test example 4 Effective antigen amount confirmation test: The recombinant antigen proteins (Knob-GCN4 and CMP-Knob) purified in Examples 1 and 4 were subjected to a test for confirming the effective antigen amount in chickens.
- Oily adjuvant (light liquid paraffin, monooleic acid) so that the recombinant antigen protein (Knob-GCN4 and CMP-Knob) is 10 ⁇ g / 0.5 mL, 3 ⁇ g / 0.5 mL, 1 ⁇ g / 0.5 mL, 0.3 ⁇ g / 0.5 mL in terms of Knob Mixed with sorbitan and polysorbate 80), and inoculated into the leg leg muscle of 29-day-old SPF chicken by 0.5 mL intramuscular injection. Seven weeks after immunization, blood was collected from chickens, and the collected serum was subjected to HI test.
- the HI antibody titer was determined from the hemagglutination image after adding 0.05 mL of suspended 0.5% chicken erythrocytes, mixing and reacting at room temperature for 1 hour.
- recombinant antigen protein (Knob-GCN4) showed a good HI antibody induction effect at 1 ⁇ g / 0.5 mL or more and recombinant antigen protein (CMP-Knob) at 0.3 ⁇ g / 0.5 mL or more. (FIGS. 5 and 6).
- Example 5 Protective effect confirmation test against highly toxic EDSV infection: About the recombinant antigen protein (CMP-Knob) refine
- the recombinant antigen protein (CMP-Knob) was mixed and prepared with an oily adjuvant (mixed with light liquid paraffin, sorbitan monooleate, and polysorbate 80) so that the Knob equivalent would be 10 ⁇ g / 0.5 mL.
- EDSV EB66 which is an antigen of EDS vaccine commercially available from Kakenken was used.
- EDSV cultured in EB66 cells was mixed and prepared with an oily adjuvant (mixed with light liquid paraffin, sorbitan monooleate, and polysorbate 80) so that the concentration was 10 6.7 TCID 50 /0.5 mL or more.
- the prepared vaccine was inoculated by intramuscular injection of 0.5 mL into the leg leg muscle of about 210-day-old commercial chicken (layer). Blood was collected at weeks 4, 6, 9, 12, and 16 of immunization, and the collected serum was subjected to HI test.
- the HI antibody titer was determined from the hemagglutination image after adding 0.05 mL of suspended 0.5% chicken erythrocytes, mixing and reacting at room temperature for 1 hour.
- a vaccine comprising a recombinant protein and / or a multimer thereof, which is a fusion of a polypeptide having an EDSV knob region and a coiled coil-forming unit of the present invention, induces high HI antibodies when inoculated into chickens. It is possible to prevent the development of EDS. Therefore, it is possible to prevent EDS from occurring on farms where EDS is expected to occur.
- the vaccine of the present invention can be produced without depending on duck eggs and can be supplied stably.
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Abstract
Description
コイルドコイル形成ユニットを有するポリペプチドとEDSVのファイバータンパク質中のknob領域を結合させた融合タンパク質。
大腸菌を宿主にして発現させる場合には、封入体画分に融合タンパク質を発現させてもよい。大腸菌から封入体を回収する方法としては、例えば、超音波破砕法、高圧ホモジナイザー法、BugBuster(メルク株式会社)を用いた方法が例示される。
抗体を酵素や蛍光色素で標識する方法としては、EasyLink antibody conjugation kits(abcam)、Lightning-Link Rapid Conjugation System(Innova Biosciences Ltd)、Oyster Antibody Labeling Kit(Luminartis GmbH)、酵素標識キットEZ-Link(PIERCE Biotechnology)、PlatinumLink Protein Labeling Kit(Kreatech Biotechnology BV)、DyLight Antibody Labeling Kit(PIERCE Biotechnology)が例示される。
Knob-GCN4タンパク質及びその多量体の調製
(1)Knob-GCN4発現ベクターの構築
EDSV KE-80株から下記の方法によりゲノムDNAを抽出した。9日齢の発育家鴨卵尿膜腔内にウイルスを接種後、6日目に採取した尿膜腔液をプロテイナーゼK(1 mg/ml)を添加したプロナーゼ溶液中に加え、50℃で1時間、更に37℃で1晩振盪した。その後、フェノール/クロロホルムによる除タンパク質、エタノール沈殿、RNase A(Qiagen)処理を行い、ウイルスゲノムDNAを抽出した。
抽出したウイルスゲノムDNAを鋳型として、NcoI認識配列を有するセンス鎖プライマー(配列番号3)及びXhoI認識配列を有するアンチセンス鎖プライマー(配列番号4)を用いて、ファイバータンパク質のknob領域及び8リピート分のシャフト領域の一部(配列番号5)をコードするDNA断片(配列番号6)をPolymerase Chain Reaction(PCR)によって増幅した。この増幅DNA断片及びプラスミドpET-15b(メルク株式会社)を制限酵素NcoI及び制限酵素XhoIで切断処理し、その後、DNAリガーゼで両者を結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドを中間ベクター1とした。
改変型GCN4タンパク質(NCBI#: 1CZQ_A)の3価コイルドコイル形成ユニット(以下、GCN4)に(G4S)2リンカー配列を付加したポリペプチド(以下、(G4S)2-GCN4)(配列番号7)を大腸菌で発現させるため、それをコードするDNA配列のコドンを最適化し、発現ベクターにクローニングするための5'末端へのNcoI認識配列並びに3'末端へのXhoI認識配列を付加したDNA配列(配列番号8)を設計し、これを人工合成した。この合成DNA及びプラスミドpET-21d(メルク株式会社)を制限酵素NcoI及び制限酵素XhoIで切断処理し、その後、DNAリガーゼで両者を結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドを中間ベクター2とした。
中間ベクター1を鋳型として、NcoI認識配列を有するセンス鎖プライマー(配列番号9)及びNcoI認識配列を有するアンチセンス鎖プライマー(配列番号10)を用いて、Knob(配列番号11)をコードするDNA断片(配列番号12)をPCRによって増幅した。この増幅DNA断片及び中間ベクター2を制限酵素NcoIで切断処理し、その後、DNAリガーゼで両者を結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドをpKNOB2とした。pKNOB2はKnob、(G4S)2リンカー配列、GCN4及びHisx6(H6)タグ配列で構成されるポリペプチド(以下、Knob-GCN4)(配列番号13)(図1)をコードするDNA配列(配列番号14)を含む。pKNOB2を大腸菌BL21(DE3)(メルク株式会社)に導入し、Knob-GCN4発現大腸菌KNOB2株を得た。
200 mLサイズの三角フラスコに10 mlのLB培地とアンピシリン溶液(終濃度100 μg/ml)を分注し、Knob-GCN4発現大腸菌KNOB2株を接種して、37℃で14時間程度振盪培養した(前培養)。2 Lサイズの三角フラスコに250 mLのLB培地とアンピシリン溶液(終濃度100 μg/ml)を分注し、これに5 mlの前培養菌液を植菌して、OD590が0.6を超えるまで37℃で振盪培養した。本培養のOD590が0.6を超えたところで、終濃度が1 mMとなるようイソプロピル‐β‐D‐ガラクトピラノシド(IPTG)を添加し、37℃で4時間、振盪培養した。本培養液を遠心管に移し、8,000 rpm・4℃・30分間の遠心分離によって菌体ペレットを回収した。
50 mL のBugBuster Master Mix(Novagen社)にComplete プロテアーゼインヒビターカクテル錠(Roche)を2錠加え、これを菌体破砕液とした。菌体ペレットを菌体破砕液に懸濁して室温で60分間インキュベーションし、その後、超音波破砕(氷上、Output 4、Duty 70%、10分間を3回)した。破砕液を遠心分離(15,000 rpm, 4℃・30分間)し、上清(可溶性画分)を回収した。
可溶性画分に含まれる組換え抗原タンパク質を、HisTrap HP, 5mlカラム(GEヘルスケア社)を用い、カラムに付属する説明書に従って精製した。20 mM(終濃度)のイミダゾールを添加した可溶性画分をカラムにアプライし、20 mM(終濃度)のイミダゾールを含むバッファーでカラム洗浄した後、500 mM(終濃度)のイミダゾールを含むバッファーでカラム溶出を行った。得られた溶出画分をAmicon Ultra-15 10K(Millipore社)によって濃縮し、透析によってバッファー成分をPBSへ置換しKnob-GCN4抗原を得た。
GCN4-Knobタンパク質及びその多量体の調製
(1)GCN4-Knob発現ベクターの構築
中間ベクター2を鋳型として、NcoI認識配列を有するセンス鎖プライマー(配列番号15)及びXhoI認識配列を有するアンチセンス鎖プライマー(配列番号16)を用いて、GCN4に(G4S)1リンカー配列を付加したポリペプチド(以下、GCN4-(G4S)1)(配列番号17)をコードするDNA断片(配列番号18)をPCRによって増幅した。この増幅DNA断片及びプラスミドpET-21d(メルク株式会社)を制限酵素NcoI及び制限酵素XhoIで切断処理し、その後、DNAリガーゼで両者を結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドを中間ベクター3とした。
中間ベクター1を鋳型として、XhoI認識配列を有するセンス鎖プライマー(配列番号19)及びXhoI認識配列を有するアンチセンス鎖プライマー(配列番号20)を用いて、Knob(配列番号11)をコードするDNA断片(配列番号12)をPCRによって増幅した。この増幅DNA断片及び中間ベクター3を制限酵素XhoIで切断処理し、その後、DNAリガーゼで両者を結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドをpKNOB3とした。pKNOB3はGCN4、(G4S)1リンカー配列、Knob及びヒスチジンヘキサマータグ配列で構成されるポリペプチド(以下、GCN4-Knob)(配列番号21)(図1)をコードするDNA配列(配列番号22)を含む。pKNOB3を大腸菌BL21(DE3)(メルク株式会社)に導入し、GCN4-Knob発現大腸菌KNOB3株を得た。
(2)実施例1と同様にして組換え大腸菌の培養及び発現タンパク質の精製を行い、GCN4-Knob抗原を得た。
Knob-CMPタンパク質及びその多量体の調製
(1)Knob-CMP発現ベクターの構築
Knob、(G4S)2H6(G4S)2リンカー配列、及びCMPタンパク質(NCBI#: NP_001025546)の3価コイルドコイル形成ユニットで構成されるポリペプチド(以下、Knob-CMP)(配列番号23)(図1)を大腸菌で発現させるため、それをコードするDNA配列のコドンを最適化し、発現ベクターにクローニングするための5'末端へのNdeI認識配列並びに3'末端へのBamHI認識配列を付加し、更に5'末端並びに3'末端への保護塩基を付加したDNA配列(配列番号24)を設計し、人工合成した。この合成DNAと制限酵素EcoRVによって切断処理したプラスミドpUC57(ジェンスクリプト株式会社)をDNAリガーゼによって結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドを中間ベクター4とした。
中間ベクター4を制限酵素NdeI及び制限酵素BamHIで切断処理し、Knob-CMPをコードするDNA断片を得た。このDNA断片と制限酵素NdeI及び制限酵素BamHIで切断処理したプラスミドpET-11a(メルク株式会社)をDNAリガーゼで結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドをpKNOB4とした。さらに、pKNOB4を大腸菌BL21(DE3)(メルク株式会社)に導入し、Knob-CMP発現大腸菌KNOB4株を得た。
(2)実施例1と同様にして組換え大腸菌の培養及び発現タンパク質の精製を行い、Knob-CMP抗原を得た。
CMP-Knobタンパク質及びその多量体の調製
(1)CMP-Knob9発現ベクターの構築
CMP、(G4S)2H6(G4S)1(G3S)1リンカー配列、及びKnobで構成されるポリペプチド(以下、CMP-Knob)(配列番号25)(図1)を大腸菌で発現させるため、それをコードするDNA配列のコドンを最適化し、発現ベクターにクローニングするための5'末端へのNdeI認識配列並びに3'末端へのBamHI認識配列を付加し、更に5'末端並びに3'末端への保護塩基を付加したDNA配列(配列番号26)を設計し、人工合成した。この合成DNAと制限酵素EcoRVによって切断処理したプラスミドpUC57(ジェンスクリプト株式会社)をDNAリガーゼによって結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドを中間ベクター5とした。
中間ベクター5を制限酵素NdeI及び制限酵素BamHIで切断処理し、CMP-KnobをコードするDNA断片を得た。このDNA断片と制限酵素NdeI及び制限酵素BamHIで切断処理したプラスミドpET-11a(メルク株式会社)をDNAリガーゼで結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドをpKNOB5とした。さらに、pKNOB5を大腸菌BL21(DE3)(メルク株式会社)に導入し、CMP-Knob発現大腸菌KNOB5株を得た。
(2)実施例1と同様にして組換え大腸菌の培養及び発現タンパク質の精製を行い、CMP-Knob抗原を得た。
Knobタンパク及びその多量体の調製
(1)Knob発現ベクターの構築
EDSVファイバータンパク質のknob領域にヒスチジンヘキサマータグ配列を付加したポリペプチド(配列番号1)(図1)を大腸菌で発現させるため、それをコードするDNA配列のコドンを最適化し、発現ベクターにクローニングするための5'末端へのNdeI認識配列並びに3'末端へのBamHI認識配列を付加したDNA配列(配列番号2)を設計し、これを人工合成した。この合成DNA及びプラスミドpET-11a(メルク株式会社)を制限酵素NdeI及び制限酵素BamHIで切断処理し、その後、DNAリガーゼで両者を結合した。結合産物を大腸菌DH5αへ導入し、得られたプラスミドをpKNOB1とした。さらに、pKNOB1を大腸菌BL21(DE3)(メルク株式会社)に導入し、Knob発現大腸菌KNOB1株を得た。
(2)実施例1と同様にして組換え大腸菌の培養及び発現タンパク質の精製を行い、Knob抗原を得た。
実施例1~4及び比較例1において精製した5種類の組換え抗原タンパク質(Knob、GCN4-Knob、Knob-GCN4、CMP-Knob、Knob-CMP)についてBCA Protein Assay Kit (Pierce社) を用いて定量を行った。結果を表1に示す。
組換えタンパク質の性状解析:
実施例1~4及び比較例1において精製した5種類の組換え抗原タンパク質(Knob、GCN4-Knob、Knob-GCN4、CMP-Knob、Knob-CMP)についてSDS-PAGE解析を行った。組換え抗原タンパク質を還元剤を含まないサンプルバッファーと混合し、100℃・5分間の熱変性処理を行ったタンパク質サンプルおよび熱変性処理を行わなかったタンパク質サンプルを2μg/レーンで12.5%均一濃度トリス-グリシン系ゲル(Atto, E-R12.5L)にアプライして10 mAで130分間通電した。CBB染色はEz Stain Aqua(Atto, AE-1340)を用いて行った。ウェスタンブロット解析は、一般的な方法でPVDF膜転写を行った後、100倍希釈した抗Knobタンパク質ニワトリ血清で一次抗体反応を行い、4,000倍希釈した抗ニワトリIgG-HRPコンジュゲート抗体(Chicken IgG(IgY)-heavy and light chain Antibody、BETHYL LABORATORIES社)で二次抗体反応を行った。二次抗体反応後、Western Lightning Plus-ECL(Perkin Elmer Life and Analytical Science社)を用いて化学発光反応を行い、Image Quant LAS4000 mini(GEヘルスケア社)で発光像を記録した。その結果、5種類の組換え抗原タンパク質がいずれも3量体と推定される分子を形成していることを確認した(図2)。
ゲル濾過解析はAKTA Prime Plus (GEヘルスケア社)に接続したHiLoad 16/60 Superdex 200 prepgradeカラム (GEヘルスケア)を用いて行った。流速は0.8 ml/minに設定し、バッファーはPBSを用いた。分子量マーカーはGel Filtration Calibration Kits LMWおよびHMW (GEヘルスケア社) を用いた。解析の結果、5種類の組換え抗原タンパク質がいずれも3量体と推定される分子を形成していることを確認した(図3)。
組換え抗原の免疫原性評価(赤血球凝集抑制試験(HI試験)):
実施例1~4及び比較例1において精製した5種類の組換え抗原タンパク質(Knob、GCN4-Knob、Knob-GCN4、CMP-Knob、Knob-CMP)について、鶏へ免疫を行い誘導されるHI抗体価を測定した。組換え抗原タンパク質がKnob換算で10μg/0.5mLとなるよう油性アジュバント(軽質流動パラフィン, モノオレイン酸ソルビタン, ポリソルベート80を混合したもの)と混合・調製した。対照ワクチンとして、化血研から市販されているEDSワクチンの抗原であるEDSV(EB66)を使用した。EB66細胞で培養したEDSVを106.7 TCID50/0.5mL以上となるよう油性アジュバント(軽質流動パラフィン, モノオレイン酸ソルビタン, ポリソルベート80を混合したもの)と混合・調製した。調製したワクチンを29日齢のSPF鶏の下腿脚部筋肉内に0.5mL筋肉注射により接種した。免疫7週後に鶏から採血を行い、採取された血清についてHI試験を実施した。HI試験は試験血清を3倍量の25%カオリンと混合(=4倍希釈)して室温で5分毎に振とうしながら20分間処理し、2,000rpmで5分間遠心した検体を測定用試料とした。測定試料をPBS(-)で2倍段階希釈したのち、希釈した試料0.025mLに4単位/0.025mLに調製したHA抗原0.025mLを添加して室温で10~20分間感作させ、さらにPBSに浮遊させた0.5%鶏赤血球0.05mLを添加、混合して室温で1時間反応させた後の赤血球凝集像よりHI抗体価を判定した。試験の結果、組換え抗原タンパク質の中でも多量体形成ユニットを付加したもの、特にGCN4-Knob、CMP-Knob、Knob-CMPの3種類の組換えタンパク質抗原で誘導されるHI抗体価が向上することを確認した(図4)。
有効抗原量確認試験:
実施例1及び4において精製した組換え抗原タンパク質(Knob-GCN4及びCMP-Knob)について、鶏への有効抗原量確認試験を実施した。組換え抗原タンパク質(Knob-GCN4及びCMP-Knob)がKnob換算で10μg/0.5mL、3μg/0.5mL、1μg/0.5mL、0.3μg/0.5mLとなるよう油性アジュバント(軽質流動パラフィン, モノオレイン酸ソルビタン, ポリソルベート80を混合したもの)と混合・調製し、29日齢のSPF鶏の下腿脚部筋肉内に0.5mL筋肉注射により接種した。免疫7週後に鶏から採血を行い、採取された血清についてHI試験を実施した。HI試験は試験血清を3倍量の25%カオリンと混合(=4倍希釈)して室温で5分毎に振とうしながら20分間処理し、2,000rpmで5分間遠心した検体を測定用試料とした。測定試料をPBS(-)で2倍段階希釈したのち、希釈した試料0.025mLに4単位/0.025mLに調製したHA抗原0.025mLを添加して室温で10~20分間感作させ、さらにPBSに浮遊させた0.5%鶏赤血球0.05mLを添加、混合して室温で1時間反応させた後の赤血球凝集像よりHI抗体価を判定した。試験の結果、組換え抗原タンパク質(Knob-GCN4)は1μg/0.5mL以上で、組換え抗原タンパク質(CMP-Knob)は0.3μg/0.5mL以上で良好なHI抗体誘導効果を示すことが確認された(図5及び図6)。
強毒EDSVの感染に対する防御効果確認試験:
実施例4において精製した組換え抗原タンパク質(CMP-Knob)について、当該タンパク質を免疫した鶏における強毒EDSV感染に対する発症防御効果確認試験を実施した。組換え抗原タンパク質(CMP-Knob)がKnob換算で10 μg/0.5mLとなるよう油性アジュバント(軽質流動パラフィン, モノオレイン酸ソルビタン, ポリソルベート80を混合したもの)と混合・調製した。対照ワクチンとして、化血研から市販されているEDSワクチンの抗原であるEDSV(EB66)を使用した。EB66細胞で培養したEDSVを106.7 TCID50/0.5mL以上となるよう油性アジュバント(軽質流動パラフィン, モノオレイン酸ソルビタン, ポリソルベート80を混合したもの)と混合・調製した。調製したワクチンを約210日齢の市販鶏(レイヤー)の下腿脚部筋肉内に0.5mL筋肉注射により接種した。免疫4、6、9、12及び16週目に採血を行い、採取された血清についてHI試験を実施した。HI試験は試験血清を3倍量の25%カオリンと混合(=4倍希釈)して室温で5分毎に振とうしながら20分間処理し、2,000rpmで5分間遠心した検体を測定用試料とした。測定試料をPBS(-)で2倍段階希釈したのち、希釈した試料0.025mLに4単位/0.025mLに調製したHA抗原0.025mLを添加して室温で10~20分間感作させ、さらにPBSに浮遊させた0.5%鶏赤血球0.05mLを添加、混合して室温で1時間反応させた後の赤血球凝集像よりHI抗体価を判定した。免疫16週後に強毒EDSV KE-80株を106.5 TCID50/羽となるように経口投与により感染させ、攻撃後4週間産卵状況を観察した。試験の結果、組換え抗原タンパク質(CMP-Knob)は10 μg/0.5mL免疫することで免疫後16週間にわたり高いHI抗体価を維持することが確認された(図7)。また、組換え抗原タンパク質(CMP-Knob)を免疫した鶏は免疫16週後の時点で強毒EDSVを感染させても、産卵停止・異常卵産出などの臨床症状を大幅に軽減可能であることが確認された(図8)。
Claims (35)
- コイルドコイル形成ユニットを有するポリペプチドと産卵低下症候群(EDS)ウイルス(EDSV)のファイバータンパク質中のノブ領域(Knob)を結合させた融合タンパク質。
- 前記ポリペプチドとKnobとの間にリンカー配列及び/又はタグ配列を有する請求項1に記載の融合タンパク質。
- 前記コイルドコイル形成ユニットが、天然の多量体形成タンパク質に由来するものである請求項1又は2に記載の融合タンパク質。
- 前記天然の多量体形成タンパク質が、GCN4又はcartilage matrix protein(CMP)である請求項3に記載の融合タンパク質。
- GCN4又はCMPがKnobのC末端側に結合したものである請求項4に記載の融合タンパク質。
- GCN4がKnobのC末端側に結合したものである請求項5に記載の融合タンパク質。
- 配列番号13で表されるアミノ酸配列からなるポリペプチド又はこのアミノ酸配列において1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるポリペプチドである請求項6に記載の融合タンパク質。
- CMPがKnobのC末端側に結合したものである請求項5に記載の融合タンパク質。
- 配列番号23で表されるアミノ酸配列からなるポリペプチド又はこれらのアミノ酸配列において1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるポリペプチドである請求項8に記載の融合タンパク質。
- GCN4又はCMPがKnobのN末端側に結合したものである請求項4に記載の融合タンパク質。
- GCN4がKnobのN末端側に結合したものである請求項10に記載の融合タンパク質。
- 配列番号21で表されるアミノ酸配列からなるポリペプチド又はこのアミノ酸配列において1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるポリペプチドである請求項11に記載の融合タンパク質。
- CMPがKnobのN末端側に結合したものである請求項10記載の融合タンパク質。
- 配列番号25で表されるアミノ酸配列からなるポリペプチド又はこのアミノ酸配列において1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるポリペプチドである請求項13に記載の融合タンパク質。
- Knobが、配列番号11で表されるアミノ酸配列からなるポリペプチド又はこれらのアミノ酸配列において1若しくは数個のアミノ酸が欠失、置換若しくは付加されたアミノ酸配列からなるポリペプチドである請求項1ないし14のいずれかの項に記載の融合タンパク質。
- 請求項1ないし15のいずれかの項に記載の融合タンパク質を多量体化した融合タンパク質多量体。
- 請求項1ないし15のいずれかの項に記載の融合タンパク質をコードするDNA配列からなる核酸断片。
- 請求項17に記載の核酸断片を含む組換え発現ベクター。
- 請求項17に記載の核酸断片が導入された形質転換体。
- 請求項18に記載の組換え発現ベクターが導入された形質転換体。
- 請求項1ないし15のいずれかの項に記載の融合タンパク質と結合することができる抗体。
- 請求項16に記載の融合タンパク質多量体と結合することができる抗体。
- 請求項1ないし15のいずれかの項に記載の融合タンパク質を有効成分として含有するEDS用ワクチン。
- 請求項16に記載の融合タンパク質多量体を有効成分として含有するEDS用ワクチン。
- 請求項21又は22に記載の抗体を有効成分として含有するEDS用治療剤。
- 請求項17に記載の核酸断片を有効成分として含有するEDS用DNAワクチン。
- 請求項18に記載の組換え発現ベクターを有効成分として含有するEDS用DNAワクチン。
- 請求項1ないし15のいずれかの項に記載の融合タンパク質を含む、被検試料中のEDSVのノブ領域(Knob)に対する抗体量を測定するためのキット。
- 請求項16に記載の融合タンパク質多量体を含む、被検試料中のEDSVのノブ領域(Knob)に対する抗体量を測定するためのキット。
- 請求項21又は22に記載の抗体を含む被検試料中のEDSVのノブ領域(Knob)の含有量を測定するためのキット。
- 請求項1ないし15のいずれかの項に記載の融合タンパク質を鶏に投与するEDSの予防方法。
- 請求項16に記載の融合タンパク質多量体を鶏に投与するEDSの予防方法。
- 請求項21又は22に記載の抗体を鶏に投与するEDS治療方法。
- 請求項17に記載の核酸断片を鶏に投与するEDSの予防方法。
- 請求項18に記載の組換え発現ベクターを鶏に投与するEDSの予防方法。
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