CN110055272A - A kind of targeting antibodies therapeutic agent inhibiting PRRS virus multiplication - Google Patents
A kind of targeting antibodies therapeutic agent inhibiting PRRS virus multiplication Download PDFInfo
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- CN110055272A CN110055272A CN201910314591.2A CN201910314591A CN110055272A CN 110055272 A CN110055272 A CN 110055272A CN 201910314591 A CN201910314591 A CN 201910314591A CN 110055272 A CN110055272 A CN 110055272A
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- therapeutic agent
- targeting antibodies
- prrs virus
- antibodies therapeutic
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Abstract
The invention belongs to field of biology, and in particular to a kind of targeting antibodies therapeutic agent of the inhibition PRRS virus multiplication by Yeast system expression, the targeting antibodies therapeutic agent have amino acid sequence shown in SEQ ID NO:1.Compared with prior art, beneficial effects of the present invention: the present invention passes through overlapping pcr, anti- PRRS virus nsp9 nano antibody gene is connected to obtain DNA sequence dna with 1 Fc fragment gene of pig IgG, and the sequence is connected to yeast expression vector, and it is transformed into Pichia pastoris competent cell, targeting antibodies therapeutic agent is prepared in culture, this targeting antibodies therapeutic agent had both had the function into PRRS virus target cell, Nsp9 can be specifically bound again, to realize the effect of targeted inhibition PRRS virus multiplication.
Description
Technical field
The invention belongs to field of biology, and in particular to a kind of target of the inhibition PRRS virus multiplication by Yeast system expression
To Antybody therapy agent.
Background technique
Porcine reproductive and respiratory syndrome (Porcine reproductive and respiratory syndrome,
PRRS) be a boar caused by PRRS viral (PRRSV) infection acute infectious disease.Since PRRS virus has antigenic variation
Features, the existing vaccines such as property, antibody-dependent enhancement (ADE) and persistent infection have the protective effect of the disease very much
Limit.PRRSV has very strong cell tropism, and main infection has the mononuclear macrophage of Fc receptor.Therefore, exploitation has targeting
The Antybody therapy agent of mononuclear macrophage with Fc receptor will be helpful to the infection and propagation of control PRRSV.
PRRS virus is single strand plus RNA virus, non-knot of the duplication and transcription of gene dependent on virus itself coding
Structure albumen, the rna polymerase activity that wherein there is non-structural protein Nsp9 RNA to rely on are the most important replicase of virus.It is newest
Research discovery Nsp9 interaction can not only occur with some host cell proteins and virus protein itself, to influence disease to virus
Poison proliferation, and the virulence of Nsp9 and virus also has close relationship.Therefore, Nsp9 is most suitable as antiviral drugs
Target spot.
The drug of existing treatment porcine reproductive and respiratory syndrome has therapeutic effect poor, the disadvantage more than side effect.
Summary of the invention
In view of the deficiency of the prior art, one aspect of the present invention provides a kind of targeting for inhibiting PRRS virus multiplication
Antybody therapy agent and its preparation method and application;On the other hand a kind of DNA sequence dna encoding the targeting antibodies therapeutic agent is provided;This
Invention also provides a kind of yeast expression vector.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of targeting antibodies therapeutic agent inhibiting PRRS virus multiplication, the targeting antibodies therapeutic agent have SEQ ID NO:
Amino acid sequence shown in 1;The targeting antibodies therapeutic agent can be targeted into PRRS virus permissive cell, and by special
Property combination PRRS virus nonstructural protein Nsp9, inhibit proliferation of the PRRS virus in permissive cell.
A kind of DNA sequence dna, the DNA sequence dna have nucleotide sequence shown in SEQ ID NO:2;The DNA sequence dna is compiled
The amino acid sequence of code is included in amino acid sequence shown in SEQ ID NO:1;The DNA sequence dna is by over-lap PCR skill
Anti- PRRS virus nsp9 nano antibody gene is connected to obtain by art with pig IgG 1Fc fragment gene.
A kind of expression vector, the expression vector are by being connected to after the DNA sequence dna digestion in claim 2 complete
It is obtained in red Yeast expression carrier pPICZ α A;
The expression vector can express the targeting antibodies therapeutic agent in claim 1.
A kind of preparation method for the targeting antibodies therapeutic agent inhibiting PRRS virus multiplication, comprising the following steps:
Step 1, by overlapping pcr, by anti-PRRS virus nsp9 nano antibody gene and pig IgG 1Fc fragment gene
Series connection obtains DNA sequence dna as claimed in claim 2;
The DNA sequence dna that step 1 obtains is connected in yeast expression vector pPICZ α A by step 2 after digestion
Obtain the expression vector in claim 3;
Step 3, the expression vector that step 2 is obtained is transformed into Pichia pastoris competent cell X-33, then through making a living
It is coated on the Salt LB agar plate of blasticidin resistance and cultivates after change, picking monoclonal colonies are expressed anti-through methanol induction
Body therapeutic agent obtains targeting antibodies therapeutic agent crude product;
Step 4, the targeting antibodies therapeutic agent crude product that step 3 is obtained are obtained by Protein G affinity chromatography
Purity is greater than 90% targeting antibodies therapeutic agent.
It is a kind of inhibit PRRS virus multiplication targeting antibodies therapeutic agent preparation treatment PRRS drug in application.
Compared with prior art, beneficial effects of the present invention:
The present invention is by overlapping pcr, by anti-PRRS virus nsp9 nano antibody gene and pig IgG 1Fc fragment gene
Series connection obtains DNA sequence dna, and the sequence is connected to yeast expression vector, and be transformed into Pichia pastoris competent cell, trains
It supports and targeting antibodies therapeutic agent is prepared, this targeting antibodies therapeutic agent had not only had the function into PRRS virus target cell, but also can
To specifically bind Nsp9, to realize the effect of targeted inhibition PRRS virus multiplication.
Detailed description of the invention
Fig. 1 (a) is targeting antibodies therapeutic agent nucleic acid electrophoretogram, and swimming lane M is DNA molecular standard;It (b) is targeting antibodies treatment
Agent protein electrophoresis figure, swimming lane M are protein molecule standards.
Fig. 2 is enzyme-linked immunization (ELISA) experimental identification targeting antibodies therapeutic agent and Nsp9 interaction.
Fig. 3 is that indirect immunofluorescence experiment detection targeting antibodies therapeutic agent enters in PAMs cell.
After inoculating cell 48 hours, (a) intracellular PRRS virus N sp9 gene level and (b) are trained Fig. 4 difference PRRSV strain
Support supernatant generation of neutrons virus titer (TCID50)。
Specific embodiment
1 Pichia anomala expression Antybody therapy agent of embodiment:
SEQ ID NO:2 DNA sequence dna is obtained by gene chemical synthesis.Upstream and downstream primer is designed, amplification obtains encoding antibody and controls
Treat the gene of agent.Finished using 1 μ g pPICZ α A (being purchased from Invitrogen company) of EcoR I and Xba I (being purchased from NEB) digestion red
Yeast expression carrier and PCR recovery product connect two segments in 16 DEG C with T4DNA ligase afterwards overnight.Take 10 μ l connection products
Conversion is coated on the less salt LB+ containing 50 μ g/ml bleomycins into 80 μ lDH5a α competent escherichia coli cells after activation
Agar plate, 37 DEG C are incubated overnight, and picking single bacterium is fallen within containing 37 DEG C in 50 μ g/ml bleomycin less salt LB liquid mediums,
220rpm cultivates 12h, and bacterium solution PCR is accredited as positive bacterium solution and carries out sequencing analysis.Extracting sequencing result is positive bacterium solution
After the linearisation of restriction enzyme SacI single endonuclease digestion, electricity is rotated into Pichiapastoris expression strain X-33 competence 10 μ g of plasmid,
The Yeast Cultivation YPDS agar plate containing 100 μ g/ml bleomycins is coated with after activation, picking single colonie PCR is identified after 72h,
Choose positive bacterium colony switching BMGY culture medium transfer again after for 24 hours BMMY culture medium with 0.5% culture medium inducing expression.To yeast
Bacterium induced to the 5th day, and 7500rpm is centrifuged 10min culture supernatant.With 1M Tris-base adjust supernatant pH to 7.5-8.0 it
Between, and with 0.45 μm of membrane filtration, through Protein G resin (being purchased from Nanjing Jin Sirui company) purifying, and will mesh after elution
Albumen dialyse into 0.01M PBS (PH7.2).Antybody therapy agent is concentrated by super filter tube, 0.22 μm of sterilised membrane filter
- 80 DEG C are stored in after filtration sterilization for use.
PCR amplification:
Template: SEQ ID NO:2
Upstream primer SEQ ID NO:3:GGTGAATTCCAGGTCCAGCTGCAGGAG
Downstream primer SEQ ID NO:4:GGGTCTAGATCACTTGCCCTGTGTCTTG
2 enzyme linked immunological of embodiment experiment detection Antybody therapy agent and Nsp9 interaction
Firstly, Nsp9 is coated with elisa plate with PBS (0.01M, pH7.2), every hole 400ng, 4 DEG C overnight.Elisa plate is used
After PBS-T (Tween-20 that PBS contains 0.5% volume) washing 3 times, with confining liquid, (skimmed milk power of 2.5% concentration is dissolved in PBS-
T, 200 holes μ l/) closing 1 hour;37 DEG C of targeting antibodies therapeutic agent incubations 1 hour of various concentration is added in washing 3 times, every hole;It washes
It washs 3 times, 37 DEG C of antibody incubations 1 hour of the anti-pig Fc of HRP label is added in every hole;Washing 3 times,;100 bottoms μ l HRP are added in every hole
Object (TMB) reacts at room temperature 15 minutes, and every hole is added 50 μ l 3M sulfuric acid and terminates reaction, reads every hole at 450 nm with microplate reader
OD value.Testing result is shown in Fig. 1, and the Antybody therapy agent of Pichia anomala expression can be specifically bound with PRRS virus N sp9.
3 targeting antibodies therapeutic agent of embodiment enters cell
It after PAMs cell recovery, is layered in 24 porocyte culture plates with every 1 × 106 density of hole, cultivates 4h, discard old culture
After new 1640 culture medium of serum-free RPMI is added in base, while targeting antibodies therapeutic agent is with final concentration of 10 μM 4 degree of absorption 1h
37 DEG C are transferred to, 5% carbon dioxide incubator detects intracellular targeting antibodies using indirect immunofluorescence experiment and control after culture 1
Treat agent.Specific step is as follows: discarding supernatant, cell is washed 3 times with PBS, adds 4% paraformaldehyde, and it is fixed thin to be placed at room temperature for 15min
Born of the same parents, 0.25%Triton X-100 room temperature rupture of membranes 10min.PBS is washed 3 times, and the anti-pig of goat of FITC label is added after 1%BSA closing
Secondary antibody, 37 DEG C of incubation 1h;DAPI is added to be placed at room temperature for 5min.PBS is washed 3 times, in fluorescence microscopy microscopic observation after mounting.As a result such as
Fig. 3 display targeting Antybody therapy agent is able to enter in PAMs cell.
The experiment of 4 virus infection of embodiment
It after PAMs cell recovery, is layered in 24 porocyte culture plates with every 1 × 106 density of hole, cultivates 4h, discard old culture
Base, is added new culture medium, and inoculation 0.01MOI has the PRRSV virus rSD16/TRS2/Clover of fluorescence labels.After infection
1h, Antybody therapy agent are added in every hole cell culture medium with final concentration of 20 μM.Fluorescence virus number in cell is observed after infecting 48h
Amount.As a result as Fig. 4 shows that targeting antibodies therapeutic agent is able to suppress the PRRSV virus rSD16/TRS2/ with fluorescence labels
Breeding in CloverPAMs cell.
The foregoing is merely the preferred embodiments of invention, are not intended to limit the scope of the invention, all to utilize this
It simply modifies or converts made by description of the invention content, be applied directly or indirectly in other relevant technical fields, same
Reason is included within the scope of the present invention.
Sequence table
<110>Xibei Univ. of Agricultural & Forest Science & Technology
<120>a kind of targeting antibodies therapeutic agent for inhibiting PRRS virus multiplication
<141> 2019-04-09
<160> 4
<170> SIPOSequenceListing 1.0
<210> 1
<211> 358
<212> PRT
<213> Pichia pastoris
<400> 1
Gln Val Gln Leu Gln Glu Ser Gly Gly Gly Ser Val Gln Ser Gly Gly
1 5 10 15
Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Tyr Thr Ile Thr Asn Ser
20 25 30
Tyr Arg Met Ala Trp Phe Arg Gln Ala Pro Gly Lys Glu Arg Glu Gly
35 40 45
Val Ala Ala Ile Asn Ser Gly Gly Ser Thr Thr Tyr Ala Asp Ser Val
50 55 60
Lys Gly Arg Phe Thr Ile Ser Gln Asp Asn Ala Gln Asn Thr Leu Tyr
65 70 75 80
Leu Gln Met Asn Ser Leu Lys Ala Glu Asp Thr Ala Met Tyr Tyr Cys
85 90 95
Ala Ala Gly Arg Val Gln Trp Trp Pro Val Leu Arg Ala Leu Asn Glu
100 105 110
Asp Asp Tyr Leu Tyr Trp Gly Gln Gly Thr Gln Val Thr Val Ser Ser
115 120 125
Gly Thr Lys Thr Lys Pro Pro Cys Pro Ile Cys Pro Gly Cys Glu Val
130 135 140
Ala Gly Pro Ser Val Phe Ile Phe Pro Pro Lys Pro Lys Asp Thr Leu
145 150 155 160
Met Ile Ser Gln Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser
165 170 175
Lys Glu His Ala Glu Val Gln Phe Ser Trp Tyr Val Asp Gly Val Glu
180 185 190
Val His Thr Ala Glu Thr Arg Pro Lys Glu Glu Gln Phe Asn Ser Thr
195 200 205
Tyr Arg Val Val Ser Val Leu Pro Ile Gln His Gln Asp Trp Leu Lys
210 215 220
Gly Lys Glu Phe Lys Cys Lys Val Asn Asn Val Asp Leu Pro Ala Pro
225 230 235 240
Ile Thr Arg Thr Ile Ser Lys Ala Ile Gly Gln Ser Arg Glu Pro Gln
245 250 255
Val Tyr Thr Leu Pro Pro Pro Ala Glu Glu Leu Ser Arg Ser Lys Val
260 265 270
Thr Val Thr Cys Leu Val Ile Gly Phe Tyr Pro Pro Asp Ile His Val
275 280 285
Glu Trp Lys Ser Asn Gly Gln Pro Glu Pro Glu Gly Asn Tyr Arg Thr
290 295 300
Thr Pro Pro Gln Gln Asp Val Asp Gly Thr Phe Phe Leu Tyr Ser Lys
305 310 315 320
Leu Ala Val Asp Lys Ala Arg Trp Asp His Gly Glu Thr Phe Glu Cys
325 330 335
Ala Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Ile
340 345 350
Ser Lys Thr Gln Gly Lys
355
<210> 2
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<212> DNA
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caggtccagc tgcaggagag cggaggaggc tccgtgcagt ccggaggatc cctgaggctg 60
tcctgtgccg cctccggcta caccatcacc aactcctaca ggatggcctg gttccggcag 120
gctcctggca aggagaggga aggcgtggcc gccatcaatt ccggcggctc caccacctac 180
gccgactccg tgaagggccg gttcaccatc agccaggaca acgcccagaa caccctgtac 240
ctgcagatga actccctgaa agccgaggac accgccatgt actactgtgc tgccggaagg 300
gtgcagtggt ggcctgtgct gagggccctg aacgaggacg actacctgta ctggggccag 360
ggcacccagg tgaccgtgtc ctccggcacc aagaccaagc ccccttgccc tatctgccct 420
ggctgtgagg tggctggccc ctccgtgttc atcttccccc ccaagcccaa ggataccctg 480
atgatcagcc agacacccga ggtgacctgc gtggtggtgg acgtgagcaa ggagcacgcc 540
gaggtgcagt tctcctggta cgtggacggc gtggaggtgc ataccgctga gacaaggcct 600
aaggaggagc agttcaacag cacctaccgg gtggtgtccg tgctgcctat ccagcaccag 660
gactggctga agggcaagga gttcaagtgc aaggtgaaca acgtggacct gcccgcccct 720
attacccgga ccatcagcaa ggccatcggc cagagcaggg agcctcaggt gtacaccctc 780
cctccccctg ccgaagagct gtccaggtcc aaagtgaccg tgacctgtct ggtgatcggc 840
ttctaccccc ccgacattca cgtggagtgg aagagcaacg gacagcccga gcccgagggc 900
aattacagga ccacccctcc ccagcaggat gtggacggca ccttcttcct gtacagcaag 960
ctggccgtgg acaaggctag gtgggatcac ggcgagacct tcgagtgcgc cgtgatgcac 1020
gaggccctcc acaaccacta cacccagaag tccatcagca agacacaggg caagtga 1077
<210> 3
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ggtgaattcc aggtccagct gcaggag 27
<210> 4
<211> 28
<212> DNA
<213> Artificial Sequence
<400> 4
gggtctagat cacttgccct gtgtcttg 28
Claims (5)
1. a kind of targeting antibodies therapeutic agent for inhibiting PRRS virus multiplication, which is characterized in that the targeting antibodies therapeutic agent has
Amino acid sequence shown in SEQ ID NO:1;
The targeting antibodies therapeutic agent can be targeted into PRRS virus permissive cell, and pass through specific binding PRRS virus
Non-structural protein Nsp9 inhibits proliferation of the PRRS virus in permissive cell.
2. a kind of DNA sequence dna, which is characterized in that the DNA sequence dna has nucleotide sequence shown in SEQ ID NO:2;
The amino acid sequence of the DNA sequence encoding is included in amino acid sequence shown in SEQ ID NO:1;
The DNA sequence dna is by overlapping pcr, by anti-PRRS virus nsp9 nano antibody gene and pig IgG 1Fc segment base
Because series connection obtains.
3. a kind of expression vector, which is characterized in that the expression vector be by by after the DNA sequence dna digestion in claim 2,
It is connected in yeast expression vector pPICZ α A and obtains;
The expression vector can express the targeting antibodies therapeutic agent in claim 1.
4. it is a kind of inhibit PRRS virus multiplication targeting antibodies therapeutic agent preparation method, feature the following steps are included:
Step 1 is connected anti-PRRS virus nsp9 nano antibody gene with pig IgG 1Fc fragment gene by overlapping pcr
Obtain DNA sequence dna as claimed in claim 2;
The DNA sequence dna that step 1 obtains is connected in yeast expression vector pPICZ α A after digestion and obtains by step 2
Expression vector in claim 3;
Step 3, the expression vector that step 2 is obtained is transformed into Pichia pastoris competent cell X-33, then after overactivation
It is coated on the Salt LB agar plate of blasticidin resistance and cultivates, picking monoclonal colonies are controlled through methanol induction expression antibody
Agent is treated, targeting antibodies therapeutic agent crude product is obtained;
Step 4, the targeting antibodies therapeutic agent crude product that step 3 is obtained obtain purity by Protein G affinity chromatography
Targeting antibodies therapeutic agent greater than 90%.
5. a kind of application of targeting antibodies therapeutic agent for inhibiting PRRS virus multiplication in the drug of preparation treatment PRRS.
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CN111057145A (en) * | 2019-11-22 | 2020-04-24 | 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) | Porcine reproductive and respiratory syndrome virus Nsp2 protein nano antibody and application thereof |
CN111057145B (en) * | 2019-11-22 | 2021-10-08 | 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) | Porcine reproductive and respiratory syndrome virus Nsp2 protein nano antibody and application thereof |
CN111849763A (en) * | 2020-04-08 | 2020-10-30 | 天津大学 | Light-controlled virus propagation system and construction method and application thereof |
CN116444682A (en) * | 2023-03-31 | 2023-07-18 | 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) | Biological protein degradation targeting chimeric for targeting degradation of PRRSV key replicase and application thereof |
CN116444682B (en) * | 2023-03-31 | 2023-12-08 | 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) | Biological protein degradation targeting chimeric for targeting degradation of PRRSV key replicase and application thereof |
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