KR20150139036A - Method for preventing brucellosis using recombinant ndk antigen derived from Brucella sp. - Google Patents

Abstract

The present invention relates to a vaccine composition comprising nucleoside diphosphate kinase (NDK) protein derived from Brucella strains as an active ingredient for preventing or treating brucellosis, and to a method for preventing or treating brucellosis by using the vaccine composition. The vaccine composition provided in the present invention can be broadly used for effectively preventing or treating brucellosis since, even if Brucella strains are infected, damage caused by the infection can be reduced by NDK protein which is an active ingredient of the vaccine composition.

Description

[0001] The present invention relates to a method for preventing brucellosis using NDK recombinant antigen derived from Brucella strain.

The present invention relates to a method for preventing or treating brucellosis caused by a brucella strain-derived ndk recombinant antigen, and more particularly, to a method for preventing or treating brucellosis caused by a brucella strain comprising an ndk (nucleoside diphosphate kinase) Compositions and methods of preventing or treating brucellosis by using the vaccine compositions.

Brucellosis is one of the most common communicable diseases (human, 4th-class law infectious disease, livestock, two kinds of legal infectious diseases) and is known to cause serious public health and economical problems both domestically and globally. In recent years, the infectious diseases seen in Korea are explosively increasing in human and livestock.

Brucella spp. Is known to be Brucella abortus , B. melitensis , B. canis , B. ovis and B. suis , It is known that Brucella abortus occupies a high proportion in Korea because it infects human body and can cause serious diseases. When the brucellosis is infected, it has a mortality rate of less than 10% when it is infected to the human body, and progresses to serious diseases such as endocarditis, encephalomyelitis and arthritis by showing persistent fever, headache, loss of appetite, Symptoms are known to cause sterilization due to placental salts, endometritis, etc. in females and sterility due to testicular torsion and malformed sperm in males without any special external symptoms. Since the brucellosis bacterium proliferates within the cell and causes onset, antibiotics treatment for several years is required for a short period of time in case of human infection, and improvement of the treatment method is urgent due to aftereffects due to the use of a large amount of antibiotics However, even if it is judged to be cured, it is often recurred within a few years and continuous observation is required. However, when bovine brucellosis occurs in a cow, the brucella are continuously excreted to the outside while being maintained as a carrier for a long period without any special symptoms. Therefore, it is difficult to diagnose early, and the intracellular phagocytosis mechanism of the brucellosis, There are not many results of previous studies and it is difficult to eradicate the diseases. In addition, even when the brucellosis is infected in the body, the immunogenicity is low and immune cells are difficult to be formed.

In particular, when bovine brucellosis develops in cattle, the bacterium is present at a high concentration in each part of the body of the cattle (especially liver, spleen, lymph node, blood, etc.), and the liver, liver, spleen and stomach And it is urgently necessary to prepare national measures against the brucellosis. To this end, the development of a vaccine for preventing or treating brucellosis is required, and research is being actively conducted.

For example, Korean Patent No. 0263942 discloses a pharmaceutical composition for preventing brucellosis that includes a brucella abortus mutant strain, and US Patent Publication No. 2012-0202271 discloses a pharmaceutical composition for preventing or treating a brucellosis- Vaccines using the antigens LeuB and Bp26 are disclosed. However, these vaccines have a disadvantage in that the preventive or therapeutic effect on brucellosis is not so high, and thus they are not used for the prevention or treatment of brucellosis.

Under these circumstances, the present inventors have made extensive efforts to develop a vaccine capable of preventing or treating Brucella infection more effectively. As a result, it has been found that the ndk (nucleoside diphosphate kinase) protein expressed in Brucella abortus , which is a major causative agent of bovine brucellosis, Confirming that an immune response similar to that caused by infection can be induced, and that the pre-inoculation of the ndk protein can reduce the damage caused by the infection of the brucellosis strain, thereby completing the present invention.

It is an object of the present invention to provide a vaccine composition for the prevention or treatment of brucellosis infection comprising ndk (nucleoside diphosphate kinase) protein derived from Brucella strain as an active ingredient.

It is another object of the present invention to provide a method for preventing or treating brucellosis by using the vaccine composition.

The present inventors have focused on ndk (nucleoside diphosphate kinase) protein expressed in Brucella strain while carrying out various studies to develop a vaccine composition capable of preventing or treating Brucella infection. The ndk gene was obtained from the Brucella strain and cloned thereof to mass-produce the recombinant ndk protein. As a result of verifying the effect of the mass-produced recombinant ndk protein as a vaccine, it was found that the recombinant ndk protein was induced upon infection of the brucella strain It is possible to induce a similar type of immune response, and even if the brucellosis strain is inoculated with the recombinant ndk protein pre-inoculated mouse, it is confirmed that the damage is reduced.

Therefore, it was found that the recombinant ndk protein provided by the present invention can be used as an effective ingredient of a vaccine composition having an effect of preventing or treating brucellosis.

According to an embodiment of the present invention, there is provided a vaccine composition comprising a recombinant ndk (nucleoside diphosphate kinase) protein as an active ingredient and preventing or treating a brucellosis infection.

The term " ndk (nucleoside diphosphate kinase) "of the present invention means an enzyme consisting of about 140 amino acids and catalyzing the exchange of a phosphate group between different NDP (nucleoside diphosphate). The ndk plays a role of maintaining a concentration balance of different NTP (nucleoside triphosphates), for example, an activity of converting GTP produced by the citric acid metabolic pathway into ATP. Specific nucleotide sequences of the genes or amino acid sequence information of proteins are known from NCBI (GenBank: YP_221449.1, ACU47687.1, etc.).

In the present invention, the ndk may be ndk expressed in bovine Brucella abortus , preferably encoded by the polynucleotide of SEQ ID NO: 1 or represented by the amino acid sequence of SEQ ID NO: 2 .

The term " brucellosis " of the present invention means an infectious disease caused by infection of various Brucella bacteria, which shows a mortality rate of less than 10% when infected to the human body and has a persistent fever, headache, anorexia, , And progress to serious diseases such as endocarditis, encephalomyelitis, and arthritis. Symptoms seen in infected animals include abortions due to placental salts in females, endometritis in females and testicular malformations in males and infertility due to malformed sperm. ≪ / RTI >

In the present invention, the brucellosis may be interpreted as meaning bovine brucellosis, which is a statutory infectious disease caused by bovine brucella abortus in cattle, ≪ / RTI >

The term "prevention" of the present invention means any action that inhibits or delays the onset of brucellosis by administration of the composition.

The term "treatment" of the present invention means any action that alleviates or alleviates symptoms of a brucellosis that have already been caused by the administration of the vaccine composition of the present invention.

According to one embodiment of the present invention, an ndk gene is obtained from a brucellosis strain, inserted into a vector to obtain an expression vector, and then introduced into Escherichia coli to obtain a transformant that produces ndk, Were cultured to mass-produce and purify the recombinant ndk protein. Western blot analysis of the purified recombinant ndk protein revealed that the recombinant ndk protein exhibited immunogenicity (FIG. 1). In order to confirm whether the recombinant ndk protein can be used as an active ingredient of a vaccine composition capable of preventing or treating brucellosis caused by infection of Brucella strain, the recombinant ndk protein is inoculated into a mouse and whether or not an immune response is generated Respectively. As a result, when the recombinant ndk protein was injected into the mouse, the immunoglobulin level was significantly increased (Table 1), and the blood level of the cytokine involved in the immune response was increased (Table 2). In order to evaluate the vaccine efficacy of the recombinant ndk protein, mice were injected with recombinant ndk protein to induce an immune response, and then the mouse was inoculated with the brucellosis strain and immunized with the recombinant ndk protein The change was confirmed. As a result, the mice inoculated with the recombinant ndk protein showed significant inhibition of spleen weight gain (FIG. 2) even when the brucellosis strain was inoculated, and the increase in the number of cells of the spleen brucellosis strain was inhibited (Table 3).

Therefore, it was found that the recombinant ndk protein provided by the present invention can be used as an effective ingredient of a vaccine composition having an effect of preventing or treating brucellosis.

The recombinant < RTI ID = 0.0 > ndk < / RTI > protein of the present invention may be administered as a vaccine to induce immunity to brucellosis, which recombinant ndk protein may be suitably formulated with a pharmaceutically acceptable carrier. The pharmaceutically acceptable carrier may be a binder, a lubricant, a disintegrant, an excipient, a solubilizing agent, a dispersing agent, a stabilizer, a suspending agent, a pigment and a flavoring agent in the case of oral administration. In the case of an injection, A non-aqueous solvent such as an aqueous solvent such as water and a ring gel liquid, a vegetable oil, a higher fatty acid ester (e.g., oleic acid), and an alcohol (e.g., ethanol, benzyl alcohol, propylene glycol, glycerin, etc.) A buffering agent, a preservative, an anhydrous agent, a solubilizing agent, an isotonic agent and a stabilizer may be mixed and used. In the case of a propellant, it can be conveniently delivered in the form of an aerosol sprayer body from a pressurized pack or sprayer using a suitable propellant, such as compressed air, nitrogen, carbon dioxide, or a hydrocarbon-based low boiling point solvent.

Formulations of the pharmaceutical compositions of the present invention may be prepared in a variety of ways by mixing with pharmaceutically acceptable carriers as described above. For example, it can be prepared in the form of tablets, troches, capsules, elixirs, suspensions, syrups, wafers and the like in the case of oral administration, and in the case of injections, unit dosage ampoules or a plurality of dosage forms.

The route of administration of the vaccine composition can be administered via any conventional route so long as it can reach the target tissue.

The term "administration" of the present invention means introduction of a predetermined substance into a patient by any suitable method, and is formulated into human or veterinary and administered by various routes. The recombinant < RTI ID = 0.0 > ndk < / RTI > protein of the present invention may be administered by parenteral routes such as intravenous, intravenous, intraarterial, intramuscular or subcutaneous routes and administered by the inhalation route via oral, nasal, rectal, transdermal or aerosol It may be administered by bolus or by slow infusion, but it is preferably administered by injection.

The vaccine composition of the present invention is administered in a pharmaceutically effective amount. The term "pharmaceutically effective amount " of the present invention means an amount sufficient to exhibit a vaccine effect and an amount not causing side effects or serious or excessive immune response, The age, weight, sex, dietary habit, general health status of the subject, and the pharmaceutical industry in combination with or in combination with the recombinant ndk protein, And factors known in the medical arts. Various general considerations to be considered in determining the "therapeutically effective amount" are known to those skilled in the art and are described, for example, in Gilman et al., Eds., Goodman and Gilman's: The Pharmacological Bases of Therapeutics, 8th ed., Pergamon Press, 1990 , And Remington ' s Pharmaceutical Sciences, 17th ed., Mack Publishing Co., Easton, Pa., 1990.

The vaccine composition of the present invention may be administered as an individual therapeutic agent or in combination with other therapeutic agents, and may be administered sequentially or simultaneously with conventional therapeutic agents. And can be administered singly or multiply. It is important to take into account all of the above factors and to administer the amount in which the maximum effect can be obtained in a minimal amount without adverse effect, and can be easily determined by those skilled in the art.

In accordance with another embodiment of the present invention for achieving the above object, the present invention provides a method for preventing or treating a brucellosis infectious disease comprising the step of administering the vaccine composition to a subject who is expected to develop brucellosis, . ≪ / RTI >

The term "individual" of the present invention means a living organism capable of developing brucellosis, preferably a high vertebrate animal in which the symptoms of brucellosis may occur, more preferably a brucellosis Can be a livestock such as cattle, pigs, sheep, goats, dogs, and the like, who can be infected, and most preferably, a cow and a person who can be infected with it.

Administration of the vaccine composition of the present invention to the subject can exhibit an effect of preventing or treating brucellosis by increasing the immunity of a subject to a strain causing brucellosis. The subject to be administered with such a vaccine composition may be primarily livestock such as cows, pigs, sheep, goats, dogs and the like, but is not limited thereto and may also be used for prevention or treatment of humans in which the bovine spongiform encephalopathy .

The vaccine composition provided by the present invention can be used for prevention or treatment of more effective brucellosis due to its ability to reduce the damage caused by infection of the brucella strain with the active ingredient ndk protein.

FIG. 1 is a photograph showing the results of expression and immunogenicity of recombinant ndk protein derived from brucella. In FIG. 1, lanes 1-5 are SDS-PAGE photographs showing expression of recombinant ndk protein derived from brucella, lane 1 represents a size marker, Lane 2 represents the E. coli lysate to which the expression vector is not introduced, lane 3 represents the pMal vector in which the ndk gene is not introduced, lane 4 represents the over-expressed recombinant ndk protein, lane 5 represents the purified recombinant ndk Protein; Lanes 6-9 are immunoblot pictures, lane 6 represents a pMal vector in which the ndk gene was not immunized with the infected serum, lane 7 represents a purified recombinant ndk protein immunized with the infected serum, Lane 8 represents the pMal vector in which the ndk gene was not immunoreacted with the non-sensitized serum, and lane 9 represents the purified recombinant ndk protein immunoreacted with the noninfected serum.
FIG. 2 is a graph showing the results of evaluating immunosuppressive ability against Brucella by immunizing inoculated Brucella and measuring the weight of the spleen after the recombinant ndk protein immunization.

Hereinafter, the present invention will be described in more detail with reference to examples. However, these examples are for illustrative purposes only, and the scope of the present invention is not limited to these examples.

Example 1 Overexpression and Recognition of Immunogenicity of Recombinant ndk Protein

The brucellosis strain used in the present invention was E.coli DH5α (Introgen) for the expression of recombinant protein, and B. abortus strain 544 was distributed from the agriculture, forestry and livestock quarantine inspection headquarters. The Brucella strain was cultured using Brucella broth (BD, USA), and E. coli was cultured with LB broth (BD, USA) at 37 ° C for one day with shaking. For solid medium, 1.5% (w / v) agarose (Takara, Japan) was added to the same type of broth and, if necessary, an antibiotic, ampicillin (100 mg / ml) was added.

Total genomic DNA of Brucella strain was obtained by centrifugation of 5 ml of Brucella broth cultured for one day using a bacteria genomic DNA purification kit (Intron, Korea). Using the total genomic DNA thus obtained as a template, PCR was carried out using the following primers to amplify the ndk gene.

Forward primer; 5'-AGCGCGGATCCATGGCAATTGAACGTACGC-3 '(SEQ ID NO: 3)

Reverse primer: 5'-AGGCCTGCAGTCAGCCAACGATTTCGGT-3 '(SEQ ID NO: 4)

The amplified ndk gene was inserted into a pMal vector (New England Biolabs, USA) to obtain an expression vector, and the obtained expression vector was introduced into E. coli DH5a to obtain a transformant. The obtained transformant Was cultured in LB medium containing ampicillin (100 쨉 g / ml), 0.2 mM IPTG was added thereto to induce the expression of the ndk gene, followed by shaking culture at 37 캜 for 4 hours. After completion of the culture, the culture was centrifuged at 5,000 rpm for 20 minutes to obtain cells,

The microbial cells were subjected to freezing and thawing three times at -70 ° C and sonicated using an ultrasonic wave irradiator (Bandelin electronic, Germany), and the microbial cells were pulverized. The pulverized cells were centrifuged at 8000 rpm for 20 minutes Afterwards, the supernatant was collected and applied to a maltose resin column (Bio-Rad Laboratories, USA) to purify the recombinant ndk protein, which was confirmed by SDS-PAGE (lanes 1-5 in FIG.

On the other hand, the purified recombinant ndk protein was subjected to Western blot analysis using B. abortus non -infected serum or infected serum to analyze the immunogenicity of the recombinant ndk protein. At this time, the B. abortus -uninfected serum or infected serum was obtained from the agricultural, forestry and livestock quarantine inspection headquarters (lanes 6-9 in FIG. 1).

FIG. 1 is a photograph showing the results of expression and immunogenicity of recombinant ndk protein derived from brucella. In FIG. 1, lanes 1-5 are SDS-PAGE photographs showing expression of recombinant ndk protein derived from brucella, lane 1 represents a size marker, Lane 2 represents the E. coli lysate to which the expression vector is not introduced, lane 3 represents the pMal vector in which the ndk gene is not introduced, lane 4 represents the over-expressed recombinant ndk protein, lane 5 represents the purified recombinant ndk Protein; Lanes 6-9 are immunoblot pictures, lane 6 represents a pMal vector in which the ndk gene was not immunized with the infected serum, lane 7 represents a purified recombinant ndk protein immunized with the infected serum, Lane 8 represents the pMal vector in which the ndk gene was not immunoreacted with the non-sensitized serum, and lane 9 represents the purified recombinant ndk protein immunoreacted with the noninfected serum. As shown in FIG. 1, a recombinant ndk protein derived from B. abortus strain was produced and confirmed by SDS-PAGE. As a result, a recombinant ndk protein of about 59 kDa was produced, and the recombinant ndk protein produced by B. abortus strain It was confirmed that it exhibited the same immunogenicity as that caused by infection.

Example 2: Evaluation of vaccine efficacy of recombinant ndk protein

Example 2-1: Immunization of recombinant ndk protein

Fifteen 6-week-old female BALB / c mice (Japan SLC, Japan) were divided into three groups of five, and 100 μl of PBS (negative control group) and a pMal vector without ndk gene were introduced into each group of mice 20 μg of the protein expressed from the transformant (control) or 20 μg of the recombinant ndk protein (experimental group) were added to each incomplete Freund's adjuvant (IFA) (Sigma, USA) Immunization was induced by inoculation. At 5 and 7 weeks after the induction of the initial immune response, blood was collected from the tail vein of each mouse and each blood was obtained.

Example 2-2: Evaluation of immunoglobulin level by serum test

Each serum was obtained from each of the collected blood obtained in Example 2-1, and the obtained serum was applied to ELISA (abcam, USA) to calculate IgG1 and IgG2a values contained in each serum (Table 1).

Comparison of IgG levels according to immunization of recombinant ndk protein time
(week) Log value of antibody titer of mouse Control group Experimental group IgG1 IgG2 IgG1 IgG2 5
7 2.2 ± 0.05
2.6 ± 0.09 2.2 ± 0.04
2.4 ± 0.06 4.0 ± 0.1
4.8 ± 0.08 4.8 ± 0.05
5.2 ± 0.06

As shown in Table 1 above, it was confirmed that the immunoglobulin level was increased when the recombinant ndk protein (experimental group) was administered, as compared with the case where the pMal vector protein (control group) was administered. From these results, it was found that the immune response was induced when the recombinant ndk protein was administered.

Example 2-3: Comparison of levels of cytokines in serum

Each blood sample obtained in Example 2-1 was applied to a cytometric bead array (BD CBA Mouse Inflammation Kit), and the cytokines IL-12p70, TNF, INF-γ and MCP- 1, IL-10 and IL-6) were measured and compared (Table 2).

Concentration change of cytokine after immunization time
(week) Cytokine The concentration of cytokine (pg / ml) Negative control group Control group Experimental group 5 IL-12p70
TNF
INF-γ
MCP-1
IL-10
IL-6 0.23 + 0.04
1.51 + - 0.12
0
12.48 ± 0.52
0
0 0.15 + 0.1
4.29 0.41
0
14.17 + - 0.35
0
0 0.17 ± 0.08
4.46 ± 0.27
4.52 + - 0.21
54.37 ± 2.14
2.98 ± 0.09
2.02 ± 0.15 7 IL-12p70
TNF
INF-γ
MCP-1
IL-10
IL-6 0.38 ± 0.09
1.46 ± 0.2
0
14.93 + - 1.13
0
0 0.29 ± 0.05
4.79 ± 0.24
0.1 ± 0.04
16.89 ± 1.06
0
0 0.41 + 0.08
11.45 + - 0.54
8.67 0.41
99.28 + - 6.22
2.42 + 0.04
2.35 ± 0.09

As shown in Table 2, when the pMal vector protein (control group) was administered, the cytokine concentration was not changed except for TNF, whereas the recombinant ndk protein (experimental group) TNF, IFN-γ, MCP-1, IL-10 and IL-6 were significantly increased in the control group. From this, it was confirmed once again that the immune response was induced when the recombinant ndk protein was administered.

Example 2-4: Evaluation of vaccine efficacy of recombinant ndk protein

The final immunization was performed in the negative control group, the control group, and the experimental group set in Example 2-1. After 2 weeks had elapsed, a suspension in which Brucella was suspended in PBS at a concentration of 5 x 10 ⁴ CFU / And mice were sacrificed at 2 weeks after the inoculation, and the spleen was excised from the mice.

The average weight of the spleen was then measured to evaluate the protective effect against Brucella (Figure 2).

FIG. 2 is a graph showing the results of evaluating immunosuppressive ability against Brucella by immunizing inoculated Brucella and measuring the weight of the spleen after the recombinant ndk protein immunization. As shown in FIG. 2, it was confirmed that the weight gain of the spleen was significantly inhibited after administration of the recombinant ndk protein of the present invention, unlike the control or PBS or pMal vector.

Given that the spleen weights of mice not challenged with Brucella spp. Are in the range of about 1.3 to 1.5 mg, the spleen weight as a whole was increased by the attack of Brucella spp., As the brucella spp. It was analyzed that the weight of spleen increases with the increase of inflammatory cells caused by the immune reaction and inflammation reaction. Since the increase in the weight of the spleen was minimized by administering the recombinant ndk protein of the present invention, it was confirmed that the recombinant ndk protein of the present invention can be used as a vaccine for the prevention or treatment of brucellosis caused by infection with brucellosis I could.

Meanwhile, the spleen was immersed in PBS, homogenized, plated on a Brucella agar medium, incubated at 37 ° C for 3 days, counting the number of cells of the cultured brucellosis, counting the average value thereof , And the immunodeficiency efficiency was calculated from this (Table 3). At this time, the logarithm of the ER rate shows that the number of brucellosis cells present in the spleen is reduced by the vaccination of the present invention. The log value of the number of Brucella cells in the spleen is used to subtract the value of the control group or the experimental group from the value of the negative control group Respectively.

The number of cells in the spleen Brucella of mice immunized with the recombinant ndk protein vaccine Log value (mean + standard deviation) of brucellosis cells in the spleen ERA
Log value valence Negative control group
Control group
Experimental group 5.56 + - 0.12
5.51 + 0.08
3.82 ± 0.13 -
0.05
1.71 -
P > 0.05
P < 0.01

As shown in Table 3, it was found that, after administration of the recombinant ndk protein of the present invention, the number of cells of the spleen brucella was significantly decreased and the immune defense rate was increased, unlike the case of administering PBS or pMal vector as the control group I could.

<110> INDUSTRY-ACADEMIC COOPERATION FOUNDATION GYEONGSANG NATIONAL UNIVERSITY <120> Method for preventing brucellosis using recombinant ndk antigen          derived from Brucella sp. <130> KPA140334-KR <160> 4 <170> Kopatentin 2.0 <210> 1 <211> 420 <212> DNA <213> Artificial Sequence <220> <223> nucleoside diphosphate kinase cDNA <400> 1 atggcaattg aacgtacttt ctccatgatc aagcccgatg cgacccgccg caacctgact 60 ggcgcgatca tcgccaagct tgaagaagcg ggcctgcgcg ttgtcgcatc gaagcgcgtc 120 tggatgagcc gccgtgaagc tgaaggcttc tacgccgttc acaaggaccg tccgttcttt 180 ggcgaactgg ttgaattcat gtcctccggc ccgacggtcg ttcaggttct cgaaggcgaa 240 aacgcaattg ccaagaaccg tgaagtcatg ggcgccacca acccggccaa tgccgacgaa 300 ggcaccatcc gcaagacctt cgccctgtcc atcggtgaaa attcggttca cggttcggat 360 gctcccgaaa ccgctgccga agaaatcgcc tactggtttt cgggcaccga aatcgttggc 420                                                                          420 <210> 2 <211> 140 <212> PRT <213> Artificial Sequence <220> <223> recombinant nucleoside diphosphate kinase <400> 2 Met Ale Ile Glu Arg Thr Phe Ser Met Ile Lys Pro Asp Ala Thr Arg   1 5 10 15 Arg Asn Leu Thr Gly Ala Ile Ale Lys Leu Glu Glu Ala Gly Leu              20 25 30 Arg Val Val Ala Ser Lys Arg Val Trp Met Ser Arg Arg Glu Ala Glu          35 40 45 Gly Phe Tyr Ala Val His Lys Asp Arg Pro Phe Phe Gly Glu Leu Val      50 55 60 Glu Phe Met Ser Ser Gly Pro Thr Val Val Gln Val Leu Glu Gly Glu  65 70 75 80 Asn Ala Ile Ala Lys Asn Ala Gla Val Met Gly Ala Thr Asn Ala                  85 90 95 Asn Ala Asp Glu Gly Thr Ile Arg Lys Thr Phe Ala Leu Ser Ile Gly             100 105 110 Glu Asn Ser Val His Gly Ser Asp Ala Pro Glu Thr Ala Ala Glu Glu         115 120 125 Ile Ala Tyr Trp Phe Ser Gly Thr Glu Ile Val Gly     130 135 140 <210> 3 <211> 30 <212> DNA <213> Artificial Sequence <220> <223> forward primer <400> 3 agcgcggatc catggcaatt gaacgtacgc 30 <210> 4 <211> 28 <212> DNA <213> Artificial Sequence <220> <223> reverse primer <400> 4 aggcctgcag tcagccaacg atttcggt 28

Claims (5)

A vaccine composition comprising a recombinant ndk (nucleoside diphosphate kinase) protein as an active ingredient and preventing or treating a brucellosis infection.
The method according to claim 1,
Wherein the recombinant ndk protein is derived from Brucella abortus.
The method according to claim 1,
Wherein the recombinant ndk protein is expressed from the polynucleotide of SEQ ID NO: 1 or consists of the amino acid sequence of SEQ ID NO: 2.
The method of claim 1,
Lt; RTI ID = 0.0 &gt; pharmaceutically &lt; / RTI &gt; acceptable carrier.
A method for preventing or treating a brucellosis infectious disease comprising the step of administering the vaccine composition according to any one of claims 1 to 4 to a subject for whom the incidence of brucellosis infection is anticipated or to which the brucellosis infection has been caused.

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