CN109306007A - Anti- porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody and application - Google Patents

Anti- porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody and application Download PDF

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CN109306007A
CN109306007A CN201811121302.9A CN201811121302A CN109306007A CN 109306007 A CN109306007 A CN 109306007A CN 201811121302 A CN201811121302 A CN 201811121302A CN 109306007 A CN109306007 A CN 109306007A
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antibody
respiratory syndrome
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porcine reproductive
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CN109306007B (en
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王荡
肖少波
方六荣
朱娴静
陈映瑾
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Huazhong Agricultural University
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    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K16/00Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/08Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses
    • C07K16/10Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses from RNA viruses
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N33/48Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/53Immunoassay; Biospecific binding assay; Materials therefor
    • G01N33/569Immunoassay; Biospecific binding assay; Materials therefor for microorganisms, e.g. protozoa, bacteria, viruses
    • G01N33/56983Viruses
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    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K2317/00Immunoglobulins specific features
    • C07K2317/50Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2333/00Assays involving biological materials from specific organisms or of a specific nature
    • G01N2333/005Assays involving biological materials from specific organisms or of a specific nature from viruses
    • G01N2333/08RNA viruses

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Abstract

The invention belongs to antibody applied technical fields, more particularly to anti-porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody and application, the present invention provides a kind of genetic engineering antibodies, for shown in SEQ ID NO.6 and SEQ ID NO.8, " Y " font antibody is formed after the mixing of both albumen, can and porcine reproductive and respiratory syndrome virus nsp4 albumen into specificity combination, only one epitope of the antibody, compatibility is good, it is specific high, it can be prepared into the ELISA reagent of porcine reproductive and respiratory syndrome virus, Western-Blot detection reagent, IFA detection reagent etc..It is provided by the invention to be obtained by artificial synthesized method, therefore the anti-porcine reproductive and respiratory syndrome virus nsp4 genetic engineering antibody of simple and direct acquisition can be more convenient, animal welfare issues when effectively solving hybridoma and save the disadvantages of at high cost, phenotype is easy to be lost, while having evaded preparation ascites.

Description

Anti- porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody and application
Technical field
The invention belongs to antibody applied technical fields, and in particular to anti-porcine reproductive and respiratory syndrome virus nsp4 albumen base Because of engineered antibody and application.
Background technique
Porcine reproductive and respiratory syndrome virus (Porcine Reproductive and Respiratory Syndrome Virus, PRRSV), belong to shell type virales Arteriviridae Arterivirus, is to cause porcine reproductive and respiratory syndrome Cause of disease, can lead to pregnant sow late abortion, premature labor and produce stillborn foetus, piglet and fattening porcine respiratory disease.From in June, 2006 Since just, occur in succession in more than ten of province such as China Hubei, Hunan, Jiangxi, Anhui using highly pathogenic PRRSV as main pathogen Pig " nameless high-fever syndrome ", cause serious economic loss to the pig breeding industry in China.
Porcine reproductive and respiratory syndrome virus is the single strand plus RNA virus for having cyst membrane, and genome length is about 15kb, With 5 ' end cap and 3 ' end Poly (A) structures.Full-length genome at least contain 10 open reading frame (ORF1a, ORF1b, ORF2a, ORF2b, ORF3, ORF4, ORF5a, ORF5b, ORF6, ORF7), it overlaps between adjacent reading frame.Coding ORF2~ORF7 of virus structural protein is located at 3 ' ends of porcine reproductive and respiratory syndrome virus genome.ORF2~ORF4 is compiled Code virus secondary structure albumen, ORF5, ORF6 and ORF7 coding virus major structural protein, be respectively envelope protein GP5, Cyst membrane stromatin (M) and nucleocapsid protein (N).And the ORF1a and ORF1b that genome 5 ' is held account for about the five of full-length genome / tetra-, it can produce 4 kinds of polyproteins, respectively pp1a, pp1a-nsp2TF, pp1a-nsp2N and pp1ab.These polies Albumen can at least translate 16 non-structural proteins relevant to virus replication.It can be encoded at least after wherein pp1a is hydrolyzed 10 non-structural proteins (nsp1~8), the non-structural protein including 4 with hydrolase of proteolysis, respectively nsp1 α, Nsp1 β, nsp2 and nsp4.
Wherein nsp4 has 3C sample serine protease, and function is cracking porcine reproductive and respiratory syndrome virus coding Precursor polyprotein, to generate other non-structural proteins, these albumen collectively constitute virus replicase and transcriptase it is multiple Zoarium come complete virus duplication and proliferation.During long-term evolution, nsp4 as protease cracking polyprotein in addition to producing Non-structural protein needed for raw virus replication, additionally it is possible to target Partial joints molecule or kinases in innate immunity signal path and come Escape host immune response.
Antibody is the globulin that can be specifically bound with corresponding antigens, has immune function, therefore be widely used in immunology The fields such as analysis, radio-immuno-image and immune target therapy.Kohler and Milstein utilizes Cell culture invitro within 1975 Monoclonal antibody is successfully prepared with screening technique, becomes the milestone of antibody research field.As what is deepened continuously to antibody grinds Studying carefully, has evolved to third generation genetic engineering antibody at present, assembling antibody molecule can be transformed in people again at the genetic level, Genetic engineering antibody not only retains or increases the main physiological activity of natural antibody, also overcome monoclonal antibody preparation and Certain defects of application aspect illustrate strong momentum in field of biotechnology.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of anti-porcine reproductive and respiratory syndrome virus nsp4 protein gene engineerings Antibody, the genetic engineering antibody are protein peptide fragment shown in SEQ ID NO.6 and SEQ ID NO.8.
It is another object of the present invention to provide anti-porcine reproductive and respiratory syndrome virus nsp4 protein gene engineerings The application of antibody.Using the genetic engineering antibody, the detection kit of porcine reproductive and respiratory syndrome virus can be prepared into.
In order to achieve the above object, the present invention takes following technical measures:
Applicant is directed to porcine reproductive and respiratory syndrome virus nsp4 albumen, is prepared for a kind of anti-pig breeding and integrates with breathing Virus nsp4 protein gene engineered antibody is levied, the antibody includes protein shown in SEQ ID NO.6 and SEQ ID NO.8 Peptide fragment forms " Y " font antibody after the mixing of both albumen, can be with porcine reproductive and respiratory syndrome virus nsp4 albumen into special Property combination, only one epitope of the antibody, compatibility is good, and specificity is high, the property with monoclonal antibody specificity having the same Matter.
Protection scope of the present invention further includes encoding protein peptide fragment shown in SEQ ID NO.6 and SEQ ID NO.8 Polynucleotides, the polynucleotides may be selected to be SEQ ID NO.5 and SEQ ID NO.7.
Protection scope of the present invention further includes SEQ ID NO.2 and the SEQ ID for including in said gene engineered antibody Variable region amino acid sequence shown in NO.4.
Protection scope of the present invention further includes encoding variable domain polypeptide shown in SEQ ID NO.2 and SEQ ID NO.4 Polynucleotides, the polynucleotides may be selected to be SEQ ID NO.1 and SEQ ID NO.3.
Anti- porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody is integrated in the breeding of preparation pig with breathing The application in the detection kit of virus is levied, including the use of protein peptide fragment shown in SEQ ID NO.6 and SEQ ID NO.8, It is prepared into the ELISA reagent of porcine reproductive and respiratory syndrome virus, Western-Blot detection reagent, IFA detection reagent etc..
Compared with prior art, the invention has the following advantages that
The present invention provides a kind of anti-porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody for the first time, this is anti- Body affinity is strong, can be used in the experiment such as Western-Blot, IFA, is porcine reproductive and respiratory syndrome virus basic research, stream Row disease learns investigation and clinical diagnosis and the foundation of identification method provides material and support.
The nucleotide sequence of antibody of the present invention can be obtained by artificial synthesized method, therefore can be more convenient simple and direct obtain Anti- porcine reproductive and respiratory syndrome virus nsp4 genetic engineering antibody is obtained, hybridoma is effectively solved and saves at high cost, phenotype The disadvantages of easy to be lost, while having evaded the animal welfare issues being related to when preparing ascites.
Detailed description of the invention
Fig. 1 is building plasmid schematic diagram;
Fig. 2 is that Western-Blot determines antibody-secreting Best Times qualification figure;
Fig. 3 is that Western-Blot identifies secretory antibody schematic diagram.
Fig. 4 is that IFA identifies secretory antibody schematic diagram.
Fig. 5 is genetic engineering antibody prepared by the present invention and the monoclonal antibody conduct of porcine reproductive and respiratory syndrome virus nsp4 albumen Primary antibody carries out Western-Blot experimental result schematic diagram.
Fig. 6 is IFA detection schematic diagram of the genetic engineering antibody prepared by the present invention as primary antibody.
Specific embodiment
Illustrate that embodiments of the present invention, technological means used in the present invention are below by way of specific specific example Method known in those skilled in the art.In addition, embodiment is interpreted as illustrative, to be not intended to limit the present invention model It encloses, the spirit and scope of the invention are limited only by the claims that follow.Reagent or material of the present invention, if not otherwise specified, Derive from commercial channel.
Embodiment 1:
The preparation of the genetic engineering antibody of anti-porcine reproductive and respiratory syndrome virus nsp4 albumen:
The genetic engineering antibody of anti-porcine reproductive and respiratory syndrome virus nsp4 albumen can be according to SEQ ID NO.6 and SEQ Amino acid sequence shown in ID NO.8 is combined to obtain by industry;Or obtained by conventional protein expression mode, this Following manner is taken in invention:
1) using sequence shown in SEQ ID NO.5 as template, design specific primer IgG1-HV-F1, IgG1-HC-R amplification Heavy chain overall length polynucleotides containing leader sequence correspond to the heavy chain region AH1 of genetic engineering antibody;With SEQ ID NO.7 institute Showing that sequence is template, design specific primer κ-LV-F1, κ-LC-R1 expand the light chain overall length polynucleotides containing leader sequence, The light chain region AL1 of corresponding genetic engineering antibody.
Among the segment EcoRI that is separately connected in pABL carrier and BamHI the two restriction enzyme sites that amplification is obtained, Successfully 2 plasmids (H1 and L1) of building, plasmid construct such as Fig. 1 are identified in sequencing.
2) by plasmid H1 and L1 cotransfection HEK-293T cell, according to Thermo Fisher2000 turns The specification of transfection reagent is operated, concrete operations are as follows: is taken heavy chain and each 0.5ug of light chain plasmids (by taking 24 orifice plates as an example), is added Into 50 μ l Opti-MEM, 2.5 μ l of transfection reagent is added, mixed liquor is added in cell after room temperature effect 15min, 4-6h After be changed toFreeStyleTM293Expression Medium。
HEK-293T cell is transfected by above-mentioned pairing transfection method, changes liquid after 6h, and respectively at 48h, 72h, 96h and 120h Collect cell conditioned medium, be added 5 × SDS-PAGE Loading Buffer, 100 DEG C of boiling water baths 10min, 4 DEG C of 12000r/min from Heart 10min draws supernatant and carries out SDS-PAGE electrophoresis, with glue and the step of falling glue according to BIO-RAD protein electrophoresis instrument operation instruction Book is operated.Albumen is gone into pvdf membrane later.Sheep anti-mouse igg-HRP is added after closing pvdf membrane, is incubated at room temperature 1h, TBST It washes film and Super Signal Western Pico chemiluminescent substrate is added afterwards three times, observed in chemiluminescence imaging system And preservation of taking pictures is as a result, experimental result such as Fig. 2.
The result shows that antibody-secreting amount is best after plasmid H1 and L1 cotransfection cells 96h.
Using the above method, the genetic engineering antibody (AH1 and AL1) of HEK-293T cell expression is largely prepared, is made It is 500 μ g/mL using mouse immune globulin G (IgG) ELISA kit detection antibody protein concentration, for following for primary antibody Embodiment.
Embodiment 2:
The specificity identification of anti-porcine reproductive and respiratory syndrome virus nsp4 genetic engineering antibody:
Specificity identification (ELISA detection):
1) by the porcine reproductive and respiratory syndrome virus nsp4 albumen of purifying (by plasmid pCAGGS-nsp4 (with reference to text It offers: Tao R, Fang L, Bai D, Ke W, Zhou Y, Wang D, Xiao S.Porcine Reproductive and Respiratory Syndrome Virus Nonstructural Protein 4Cleaves Porcine DCP1a To Attenuate Its Antiviral Activity.J Immunol.2018Aug 29.pii:ji1701773.doi: 10.4049/jimmunol.1701773.), transfection cell progress eukaryotic expression obtains) coated elisa plate, peridium concentration is 1 μ g/ ML, 4 DEG C are coated with overnight.It is washed three times with PBST, the genetic engineering antibody that embodiment 1 is obtained does not do transfection processing as primary antibody HEK-293T cell conditioned medium as control, every 100 μ L of hole, which is placed in 37 DEG C of incubator, is incubated for 1h, and PBST washing three is taken second place Diluted sheep anti-mouse igg-HRP the ELIAS secondary antibody of 1:4000 of 100 μ L is added in every hole afterwards, and use after 1h is incubated in 37 DEG C of incubators PBST is washed three times, and substrate is added and is protected from light colour developing 10min, result observation and analysis are carried out after colour developing.HEK- as the result is shown Antibody in 293T cell conditioned medium can interact with porcine reproductive and respiratory syndrome virus nsp4 albumen, and gene The concentration of engineered antibody is higher, and OD630nm value still has 2.662+0.067 when 96h, therefore OD630nm value does not show the time Variation, is all larger than 2.
Then, genetic engineering antibody prepared by doubling dilution embodiment 1 carries out ELISA experiment, experimental result such as Fig. 3 institute Show.As the result is shown when the dilution of genetic engineering antibody is greater than 1:2560, OD630nm value is just less than 1.
Specificity identification (Western-Blot):
(1) identification for 4 albumen of porcine reproductive and respiratory syndrome virus nsp: plasmid pCAGGS-nsp4 (ginseng is taken respectively Examine document: Tao R, Fang L, Bai D, Ke W, Zhou Y, Wang D, Xiao S.Porcine Reproductive and Respiratory Syndrome Virus Nonstructural Protein 4Cleaves Porcine DCP1a To Attenuate Its Antiviral Activity.J Immunol.2018Aug 29.pii:ji1701773.doi: 10.4049/jimmunol.1701773.) 6ug, 3ug, 1.5ug, 0.75ug and 0ug transfection HEK-293T cell (3.5cm training Support ware) eukaryotic expression is carried out, and blank control is set up, sample is received after 36h.The genetic engineering antibody prepared using embodiment 1 is as one Anti- progress Western-Blot experiment, as a result as shown in Figure 4.
The result shows that genetic engineering antibody provided by the invention can be the same with monoclonal antibody, specific band is generated, band is clear Clear and single, not extra miscellaneous band illustrates that genetic engineering antibody provided by the invention can be integrated with pig breeding is crossed with breathing It levies virus nsp4 protein-specific to combine, and has the characteristics of high specificity of monoclonal antibody.
(2) for the identification of porcine reproductive and respiratory syndrome virus: MARC-145 cell being connected to 3.5cm culture dish, carefully Born of the same parents it is long to single layer when be inoculated with WUH3 the plant of porcine reproductive and respiratory syndrome virus of 1MOI, distinguish after inoculation 12h, for 24 hours, 36h and 48h receives sample, and the sample of acquisition is as antigen.Genetic engineering antibody, porcine reproductive and respiratory syndrome virus prepared by embodiment 1 Nsp4 albumen monoclonal antibody (being prepared according to the method that the myeloma cell of this field routine is merged with splenocyte) as primary antibody into Row Western-Blot experiment, experimental result are as shown in Figure 5.
The result shows that genetic engineering antibody provided by the invention can occur instead with porcine reproductive and respiratory syndrome virus It answers, and the band of genetic engineering antibody is equally clear and single with the band of monoclonal antibody control group as seen from the figure, without other miscellaneous Band illustrates that genetic engineering antibody provided by the invention has high specificity identical with monoclonal antibody and specificity.
Specificity identification (IFA detection)
Be put into cell climbing sheet in 24 orifice plates, then access MARC-145 cell, cell it is long to single layer when be inoculated with the pig of 1MOI WUH3 plants of Reproductive and respiratory syndrome virus, respectively after inoculation 12h, for 24 hours, 36h and 48h receive sample, while set up do not connect it is malicious thin Born of the same parents' control.After cell sample prepares, cell culture medium is discarded, with PBS (1X, pH=7.4, similarly hereinafter) wash 3 times, every time Every hole adds 1mL PBS, each 5min.When being added and discarding liquid, movement slowly will avoid blowing afloat in cell.Hole is added The paraformaldehyde of 400 μ L 4%, fixed cell 15min.Methanol after -20 DEG C of pre-coolings are added, the hole 1mL/, permeabilization cell 10min, PBS are washed 3 times.400 hole μ L/ of confining liquid is added, closes 45min~60min.Embodiment 1 is added and prepares genetic engineering 1h is made in antibody, 250 holes μ L/, 37 DEG C of senses, and PBS is washed 3 times.The sheep anti-mouse igg of fluorescein isothiocynate (FITC) label is added (doing 100 times of dilutions with PBS), 250 holes μ L/, 37 DEG C of senses abandon fluorescence secondary antibody after making 1h, and PBS is washed 3 times, paid attention to being protected from light operation.Most Mounting, upper sem observation afterwards.Experimental result such as Fig. 6.
The result shows that genetic engineering antibody provided by the invention can identify porcine reproductive and respiratory syndrome virus nsp4 egg It is white, and extension at any time, specificity fluorescent increase, and genetic engineering antibody can have bright with porcine reproductive and respiratory syndrome virus Aobvious fluorescence reaction.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as At all equivalent modifications or change, should be covered by the claims of the present invention.
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Pro Pro Lys Glu Gln Met Ala Lys Asp Lys Val Ser Leu Thr Cys Met
370 375 380
Ile Thr Asp Phe Phe Pro Glu Asp Ile Thr Val Glu Trp Gln Trp Asn
385 390 395 400
Gly Gln Pro Ala Glu Asn Tyr Lys Asn Thr Gln Pro Ile Met Asp Thr
405 410 415
Asp Gly Ser Tyr Phe Val Tyr Ser Lys Leu Asn Val Gln Lys Ser Asn
420 425 430
Trp Glu Ala Gly Asn Thr Phe Thr Cys Ser Val Leu His Glu Gly Leu
435 440 445
His Asn His His Thr Glu Lys Ser Leu Ser His Ser Pro Gly Lys
450 455 460
<210> 7
<211> 717
<212> DNA
<213>artificial sequence (Artificial Sequence)
<400> 7
atgaagttgc ctgttaggct gttggtgctg atgttctgga ttcctgcttc cagcagtgat 60
gttgtgatga cccaaactcc actctccctg cctgtcagtc ttggagatca agcctccatc 120
tcttgcagat ctagtcagac ccttgtacac agtaatggaa acacctattt acattggtac 180
ctgcagaagc caggccagtc tccaaagctc ctgatctaca aagtttccaa ccgattttct 240
ggggtcccag acaggttcag tggcagtgga tcagggacag atttcacact caagatcagc 300
agagtggagg ctgaggatct gggagtttat ttctgctctc aaagtacaca tgttcctctc 360
acgttcggtg ctgggaccaa cctggagctg aaacgggctg atgctgcacc aactgtatcc 420
atcttcccac catccagtga gcagttaaca tctggaggtg cctcagtcgt gtgcttcttg 480
aacaacttct accccaaaga catcaatgtc aagtggaaga ttgatggcag tgaacgacaa 540
aatggcgtcc tgaacagttg gactgatcag gacagcaaag acagcaccta cagcatgagc 600
agcaccctca cgttgaccaa ggacgagtat gaacgacata acagctatac ctgtgaggcc 660
actcacaaga catcaacttc acccattgtc aagagcttca acaggaatga gtgttag 717
<210> 8
<211> 238
<212> PRT
<213>artificial sequence (Artificial Sequence)
<400> 8
Met Lys Leu Pro Val Arg Leu Leu Val Leu Met Phe Trp Ile Pro Ala
1 5 10 15
Ser Ser Ser Asp Val Val Met Thr Gln Thr Pro Leu Ser Leu Pro Val
20 25 30
Ser Leu Gly Asp Gln Ala Ser Ile Ser Cys Arg Ser Ser Gln Thr Leu
35 40 45
Val His Ser Asn Gly Asn Thr Tyr Leu His Trp Tyr Leu Gln Lys Pro
50 55 60
Gly Gln Ser Pro Lys Leu Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser
65 70 75 80
Gly Val Pro Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr
85 90 95
Leu Lys Ile Ser Arg Val Glu Ala Glu Asp Leu Gly Val Tyr Phe Cys
100 105 110
Ser Gln Ser Thr His Val Pro Leu Thr Phe Gly Ala Gly Thr Asn Leu
115 120 125
Glu Leu Lys Arg Ala Asp Ala Ala Pro Thr Val Ser Ile Phe Pro Pro
130 135 140
Ser Ser Glu Gln Leu Thr Ser Gly Gly Ala Ser Val Val Cys Phe Leu
145 150 155 160
Asn Asn Phe Tyr Pro Lys Asp Ile Asn Val Lys Trp Lys Ile Asp Gly
165 170 175
Ser Glu Arg Gln Asn Gly Val Leu Asn Ser Trp Thr Asp Gln Asp Ser
180 185 190
Lys Asp Ser Thr Tyr Ser Met Ser Ser Thr Leu Thr Leu Thr Lys Asp
195 200 205
Glu Tyr Glu Arg His Asn Ser Tyr Thr Cys Glu Ala Thr His Lys Thr
210 215 220
Ser Thr Ser Pro Ile Val Lys Ser Phe Asn Arg Asn Glu Cys
225 230 235
<210> 9
<211> 34
<212> DNA
<213>artificial sequence (Artificial Sequence)
<400> 9
aggaattcgc caccatggga tgcagctgtg taat 34
<210> 10
<211> 34
<212> DNA
<213>artificial sequence (Artificial Sequence)
<400> 10
aggaattcgc caccatggga tgcagctgtg taat 34
<210> 11
<211> 34
<212> DNA
<213>artificial sequence (Artificial Sequence)
<400> 11
aggaattcgc caccatgaag ttgcctgtta ggct 34
<210> 12
<211> 31
<212> DNA
<213>artificial sequence (Artificial Sequence)
<400> 12
cgaggatccc taacactcat tcctgttgaa g 31

Claims (7)

1. a kind of anti-porcine reproductive and respiratory syndrome virus nsp4 protein gene engineered antibody, the antibody includes SEQ ID Protein peptide fragment shown in NO.6 and SEQ ID NO.8.
2. encoding the polynucleotides of protein peptide fragment shown in SEQ ID NO.6 and SEQ ID NO.8.
3. polynucleotides according to claim 2 are shown in SEQ ID NO.5 and SEQ ID NO.7.
4. the variable region of genetic engineering antibody described in claim 1 is shown in SEQ ID NO.2 and SEQ ID NO.4.
5. encoding the polynucleotides of variable region shown in claim 4.
6. polynucleotides according to claim 5 are shown in SEQ ID NO.1 and SEQ ID NO.3.
7. sequence shown in claims 1 or 2 or 4 or 5 is in the detection kit for preparing porcine reproductive and respiratory syndrome virus Application.
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CN113215108A (en) * 2020-02-06 2021-08-06 广西大学 Porcine reproductive and respiratory syndrome virus, cloning vector thereof and gene insertion method
CN114891095A (en) * 2022-04-13 2022-08-12 中国农业科学院哈尔滨兽医研究所(中国动物卫生与流行病学中心哈尔滨分中心) Nano antibody pair for detecting PRRSV antigen, kit and application thereof
CN114891095B (en) * 2022-04-13 2023-09-01 中国农业科学院哈尔滨兽医研究所(中国动物卫生与流行病学中心哈尔滨分中心) Nanobody pair for detecting PRRSV antigen, kit and application thereof

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