CN109438574A - Porcine epidemic diarrhea virus M protein-specific heavy chain antibody - Google Patents
Porcine epidemic diarrhea virus M protein-specific heavy chain antibody Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/08—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses
- C07K16/10—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from viruses from RNA viruses
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- Proteomics, Peptides & Aminoacids (AREA)
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Abstract
The invention discloses a kind of Porcine epidemic diarrhea virus M protein-specific heavy chain antibody, the nucleotide sequences of encoding said antibody are as follows: SEQ ID NO.4.Effect of the invention is that: PEDV M albumen Bactrian camel source non-immune libraries are constructed using display technique of bacteriophage, screening obtains 8 plants and comes from the anti-M albumen VHH antibody gene coded sequence in two-humped camel IgG heavy chain antibody hypervariable region, solubility expression and ELISA are carried out to it experiments have shown that it can be combined with M albumen, the difference of absorbance OD405 value shows that it is different with M protein binding capacity.8 plants of VHH antibody can prepare the genetic engineering antibody of vitro recombination by the expression of E.coli.
Description
Technical field
The invention belongs to field of biotechnology, and in particular to a kind of Porcine epidemic diarrhea virus M albumen single domain antibody.
Background technique
Pig epidemic diarrhea (Porcine Epidemic Diarrhea, PED) is by Porcine epidemic diarrhea virus (PEDV)
A kind of high degree in contact enteric infectious disease of pig caused by infecting.The sick pig of PEDV is infected mainly by orofecal virus, hair
Sick pig mainly shows the Clinical symptoms such as diarrhea, vomiting and dehydration, is one of the Infectious Diseases for leading to suckling pig death.1971
Year, PED occurs in Britain for the first time, is then diffused into all over the world.China was separated to PEDV, the country in 2010 in 1980 for the first time
PED epidemic situation occurs for most of hog area, has morbidity from suckling pig to brood sow, causes to pig farmer and seriously pass through
Ji loss.PEDV belongs to the more virales of Buddhist nun (Nidovirales) coronaviridae (Coronavi ridae) coronavirus genus
(Coronav irus), genome are that single-stranded positive has infective RNA, genome 5 ' similar to other coronavirus
There is a cap sequence (cap) at end, and there is 1 Poly (A) tail at 3 ' ends, 2,8033 nt of full-length genome, be separately encoded S,
E, 4 virus structural proteins such as M and N.S assures that existing neutralizing epitope can induce body to generate neutralizing antibody, has to piglet
There is good protecting effect.PEDV infection early stage, body can generate the high-level antibody of anti-N and N protein, be to research and develop viral blood
The candidate antigens of clear antibody diagnosis method.E protein has application prospect in terms of antiviral study.
Heavy chain antibody (the variable domain of the of natural deletions light chain present in camel category peripheral blood
Heavy chain of HCAbs, VHH) there is biological property not available for other terrestrial organisms, its antigen binding position
Point is only made of heavy chain variable region single structure domain, but equally remains good and special antigen binding with common IgG antibody
Ability.VHH is be currently available, with complete function, minimum IgG antibody molecule fragment, and molecular weight 15kDa is
The 1/10 of conventional IgG, the 1/3 of monoclonal antibody, numberator height 4.8nm, 2.2 nanometers of diameter, also referred to as nano antibody
(nanobody).VHH antibody antigen-binding site has antigen complementation combined area and the penetration into tissue of stretching, extension, in combination with common
The epitope that IgG antibody can not contact.In addition, vitro recombination VHH has the easily peculiar properties such as expression and good water solubility, making
Field is researched and developed with before wide application for miniaturization genetic engineering antibody, small molecular antibody drug and highly sensitive diagnostic reagent
Scape.
Summary of the invention
The object of the present invention is to provide a kind of Porcine epidemic diarrhea virus M protein-specific heavy chain antibodies；
The Porcine epidemic diarrhea virus M protein-specific heavy chain antibody is encoded it is a further object to provide a kind of
Nucleotide sequence；
It is also another object of the present invention to provide the Porcine epidemic diarrhea virus M protein-specific heavy chain antibody or its codings
Expression of the sequence in E.coli.
The present invention uses following technical scheme, and a kind of Porcine epidemic diarrhea virus M protein-specific heavy chain antibody encodes institute
State the nucleotide sequence of antibody are as follows: SEQ ID NO.1, SEQ ID NO.2, SEQ ID NO.3, SEQ ID NO.4, SEQ ID
NO.5, SEQ ID NO.6, SEQ ID NO.7 or SEQ ID NO.8.
A kind of recombinant expression carrier contains above-mentioned nucleotide sequence.
A kind of host cell, the host cell are the prokaryotic cell containing above-mentioned nucleotide sequence.
Preferably, the host cell is the prokaryotic cell containing above-mentioned expression vector.
The expression of the Porcine epidemic diarrhea virus M protein-specific heavy chain antibody or its coded sequence in E.coli.
Effect of the invention is that: PEDV M albumen Bactrian camel source non-immune libraries, sieve are constructed using display technique of bacteriophage
Choosing obtains 8 plants and comes from the anti-M albumen VHH antibody gene coded sequence in two-humped camel IgG heavy chain antibody hypervariable region, carries out solubility to it
Experiments have shown that it can be combined with M albumen, the difference of absorbance OD405 value shows it with M protein binding by expression and ELISA
Ability is different.8 plants of VHH antibody can prepare the genetic engineering antibody of vitro recombination by the expression of E.coli.
Detailed description of the invention
Fig. 1 is anti-PEDV M albumen VHH clone amino acid alignment result figure；
Fig. 2 is anti-PEDV M albumen VHH antibody SDS-PAGE analysis chart in E.coli.
Specific embodiment
The following examples can further illustrate the present invention, but do not limit the invention in any way.
The preparation of embodiment 1, Porcine epidemic diarrhea virus M protein-specific heavy chain antibody
1. material and method
1.1 experimental animals and reagent
2 peak, 10 month female two-humped camel is as experimental animal, ox lymphocyte separation medium, 96 hole elisa Plates；Restriction enzyme,
DNA fragmentation QIAquick Gel Extraction Kit, plasmid extraction kit are OMEGA product, nickel affinity chromatography resin (Qiagen)；E.coliRecombination
It expresses PEDV M antigen (His label and GST label)；Bacterial strain, helper phage and reagent e. coli tg1 and BL21 Star
(DE3), helper phage M13K07, carrier pHEN2 are purchased from NEB company, and other reagents are that domestic analysis is pure.
1.2 method
1.2.1 camel is immune and antibody detection
First immunisation, with 206 adjuvants (being purchased from French seepic company), emulsify the 500 subcutaneous multiple spots of μ g recombinant M protein (back, after
Leg and neck two sides muscle) inoculation camel.Head exempts from booster immunization after 21 days, and dosage is 206 1000 μ g M albumen of emulsification, exempts from head
35 days, 42 days and 63 days booster immunizations are spaced, antigen inoculation dosage is 1000 μ g M albumen.Before first immunisation and every time
Venous blood is acquired before booster immunization and is separated to serum, and the indirect ELISA for using M albumen (GST label) as antigen detects
PEDV antibody.During this immunization experiment, camel feeding management is immunized, and the acquisition of blood sample works in professional veterinary
Personnel supervise and guide lower completion.
1.2.2 the separation of peripheral blood
It is heparin sodium, 10IU/mL that 7 days (i.e. the 63rd day) jugular veins, which adopt 10 mL(anti-coagulants of anticoagulation, after last time is immune), add
The Han`s liquid for entering equivalent does 1 times of dilution, and isometric lymphocyte separation medium is then added, and it is outer to carry out density gradient centrifugation separation
All blood total lymphocytes.Isolated lymphocyte with MEM be resuspended in be added in six orifice plates (37 DEG C, 5%CO2) static 30 min,
It is adsorbed and removed cell fragment and macrophage, lymphocyte is collected by centrifugation, MEM is added, be stored in liquid nitrogen and mentioned for cell RNA
It takes.
1.2.3 VHH antibody mediated immunity library construction
3 pairs of primers (referring to table 1-VHH primer set for amplification) are designed to expand to obtain coding VHH albumen purpose base by three-wheel
Cause.Lymphocyte total serum IgE is extracted by Trizol reagent, uses G1 as reverse transcription primer, synthesizes the first chain cDNA, be with cDNA
Template, H1, G1 are that primer amplification obtains 2 DNA bands of 600bp and 900bp size, and recycling 600bp band is used as template, progress the
2 wheel PCR amplifications.
Using the 2nd wheel PCR product as template, H2, H3 are that primer obtains 450bp DNA band.Using 2 wheel PCR products as template,
P1, TN are that the 3rd wheel amplification of upstream and downstream primer progress obtains 450bp band.3rd wheel PCR product is passed through into SfiI/NotI double digestion gram
Grand to arrive pHEN2 carrier, connection product is transformed into TG1 by electrotransformation method, and 37 DEG C, 180r/min cultivates 1h, after centrifugal concentrating
It is coated in 2 × YTG plate (2% glucose, the 100 μ g/mL Amp of ammonia benzyl resistancer).10 μ L are taken to be diluted to 1 × 10 simultaneously4It applies again
Plate, 37 DEG C are incubated overnight, and calculate storage capacity.It is cultivated 16 hours in 37 DEG C of incubators of plate after conversion, it will with 2 × YT culture medium of 10mL
The lawn grown on culture plate scrapes wash clean, is added the glycerol of final concentration 25%, packing be stored in -70 DEG C it is spare, this be acquisition
Anti- PEDV M albumen VHH immune antibody library.Clone after selecting electrotransformation at random is sequenced, according to diversity and colony counts
To calculate storage capacity.
1.2.4 special anti-PEDV M albumen VHH antibody is obtained by postsearch screening process
Screening antibodies operating procedure is as follows:
(1) antigen coat: M antigen (GST label) is diluted to 20ug/ml, the hole 50ul/, 4 DEG C overnight.PBS is washed 3 times；
(2) it closes: the 2%M-PBS in the hole 300ul/ is added, with 37 DEG C of closing 1h, PBS is washed 3 times；
(3) it combines: taking 20ul phage+180ul 0.1MPBS, mix, the hole 50ul/, 37 DEG C of standing 1h；Throw away extra phagocytosis
Liquid solution, and be inverted plate and clapped on paper handkerchief and get rid of removing raffinate, 0.1%PBST is washed 3 times；
(4) primary antibody: 37 DEG C of the hole rabbit-anti M13 50ul/ standing 1h is diluted by 1:1000 with 0.1M PBS；Extra liquid is thrown away,
Inversion plate is clapped on paper handkerchief gets rid of removing raffinate, and 0.1% PBST is washed 3 times；
(5) secondary antibody: 37 DEG C of the hole HRP- goat-anti rabbit 50ul/ standing 1h is diluted by 1:10000 with 0.1M PBSS；It is extra to throw away
Liquid inversion plate is clapped on paper handkerchief gets rid of removing raffinate, and 0.1% PBST is washed 4 times；
(6) it develops the color: taking each 0.5ml of 0.2M/L Na2HPO4+0.1M/L citric acid that a small amount of OPD is added, 10ul H2O2 is mixed
The even hole 50ul/；2M sulfuric acid terminates the hole 25ul/, wavelength 490nm testing result.
1.2.5VHH soluble-expression and ELISA detection
Select 40 clones at random, be transformed into E. coli BL21 Star (DE3) expression competence in, then choose monoclonal in
In 1ml culture medium, rapid induction expression, TG1 empty bacterium body is as blank control.Collect the 1ml bacterium solution of induction, 12000rpm centrifugation
2min, abandons supernatant, and precipitating is resuspended with 0.5ml TBS；400W(6s ultrasound, 4 be interval) 10 min of ultrasound；Ultrasonic supernatant will be added
The hole 50ul/, 37 DEG C of standing 1h, TBS are washed 3 times；2%M-TBS, the hole 200ul/ is added, 37 DEG C of closing 1h, 0.1% TBST are washed 4 times；It takes
4mg PNPP, the hole 25ul/ is added in 1M diethanol amine+0.5mM MgCl2, and 3M NaOH is terminated, the hole 25ul/.Wavelength 405nm item
Part testing result.Positive reaction clone is selected to carry out sequencing and comparison.
2. result
M antibody level detects in 2.1 camel serum
Using 2 peak, 10 month female two-humped camel as experiment contrast animal.
Four M antigens (His label), which are immunized camel serum antibody and do 1: 50 dilution and detect, to be shown (to resist referring to table 2-M albumen
(OD450nm) is surveyed in physical examination), after the 2nd booster immunization, the antibody of 2 anti-M of experiment contrast animal has been positive, last time
After immune when 7 days survey antibody titers, the serum antibody OD450nm of 2 peak camels reaches 1.58 and 1.92, therefore may determine that at this time
Body fluid and cellular immune level are in lasting ascent stage in body, meet the requirement of experiment of acquisition peripheral blood lymphocytes.
2.2 anti-M albumen VHH non-immune libraries construction and screenings
After the screening of four-wheel, more apparent enrichment effect can detecte (referring to table 3- each round phage selection
It is enriched with index).Monoclonal phage ELISA experimental result shows 40 positive colonies, and the OD450nm value of each clone is shown in Table
4, M13KO7,1%M-PBS are negative control in table 4.Progress DNA sequencing is cloned to these and nucleotide sequence comparison obtains 8
VHH gene base sequence, by obtaining the anti-M albumen VHH antibody gene of 6 idiotypes after amino acid alignment.
2.3 VHH soluble-expressions and ELISA detection
Using M albumen as antigen coat ELISA Plate, with the anti-M albumen VHH of 6 idiotypes obtained under the conditions of 30 DEG C and 37 DEG C
Antibody gene carries out solubility expression and ELISA detection discovery, they can combine with M albumen, pass through absorbance value
(OD405nm) height illustrates that the binding ability of itself and antigen is had nothing in common with each other and (identified referring to table 5- M protein ELISA).
2.4 anti-M albumen VHH gene orders compare and the expression in E.coli
By seeing Fig. 1 to obtained VHH gene progress nucleotide sequencing and sequence analysis, amino acid alignment result is shown in Fig. 2.
It is analyzed by The Kabat et al. (Kabat, 1991) comparison method, amino acid indicates two-humped camel in Fig. 1 box
The distinctive mark acidic amino acid of source VHH antibody, the amino acid with underscore indicate the different amino acids between different VHH clones.For
Stable acquisition VHH antibody, is cloned into pET-28a carrier for VHH gene order respectively, is transferred to E.coliBL21(DE3) impression
In state cell, 1.0 mM IPTG carry out inducing expression, and SDS-PAGE protein electrophoresis analysis finds purpose band, molecular size range
Near 25kDa (VHH about 13.6Kda, histidine tag about 8~10KDa), purpose band is as shown by arrows in figure, it was demonstrated that institute
There is VHH antibody with successful expression.
Illustrated by Fig. 1 and table 4: screening to obtain 8 plants of coding PEDV M albumen VHH antibody sequences using display technique of bacteriophage
Column, amino acid alignment the result shows that, antibody FR2 region sequence has typical heavy chain antibody amino sequence feature, i.e. sequence
In amino acid residue be respectively F37/E44/R45/G47(Fig. 1), it was demonstrated that these antibody sequences from heavy chain antibody height become
Area.There is variation, say in the area CDR1 the amino acid residue 31S and/or N of antibody, 32S and/or N, CDR2 amino acid residue 54D or N
There are significant differences for the diversity of the amino acid sequence of 8 strain antibodies of bright coding.
Sequence table
<110>Lanzhou Veterinary Inst., Chinese Acedemy of Agaricultural Sciences
<120>a kind of Porcine epidemic diarrhea virus M protein-specific heavy chain antibody
<130> 2015
<160> 8
<170> PatentIn version 3.3
<210> 1
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 1
gaggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctgggtt cccctttact agctccgtca tgggatggtt ccgccaggct 120
ccagggaagg aacgcgaggg ggtcgcagct atttcggttg atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccaacaa cacgctgtat 240
ctgcaaatga acagcctgaa acctgaggac actgccatgt actactgtgc ggctagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggggccaggg gacccaggtc 360
accgtctcct ca 372
<210> 2
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 2
gatgtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctggatt cccctttagt aacaacgtca tgggctggtt ccgccaggct 120
ccagggaagg aacgcgaggg ggtcgcagct atttcggtta atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccaacaa cacgctgtat 240
ctgcaaatga acagcctgaa acctgaggac actgccatgt actactgtgc gactagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggggccaggg gaccctggtc 360
accgtctcct ca 372
<210> 3
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 3
gaggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctggatt cccctttagt agcaacgtca tgggctggtt ccgccaggct 120
ccagggaagg aacgcgaggg gatcgcagct atttcggttg gtagtggtag cacatggtat 180
ggcgactccg tgaagggccg attcaccatc tccctggaca acgccaacaa cacgctgtat 240
ctccaaatga acagcctgaa acctgaggac actgccatgt actactgtgc gactagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggggccaggg gacccaggtc 360
accgtctcct ca 372
<210> 4
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 4
gaggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctgggtt ctcctttagt agcaacgtca tgggctggtt ccgccaggct 120
ccagggaagg aacgcgaggg ggtcgcagct atttcggttg atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccaacaa cacgctgtat 240
ctgcaaatga acagcctgaa acctgaggac actgccatgt actactgtgc gactagacgt 300
ggagttattc ttacactgag cccagagacc tatgactact ggggccaggg gacccaggtc 360
accgtctcct ca 372
<210> 5
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 5
caggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctggatt cccctttagt aacaacgtca tgggctggtt ccgccaggct 120
ccagggaagg aacgcgaggg ggtcgcagct atttcggtta atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccaacaa cacgctgtat 240
ctgcaaatga acagcctgaa acctgaggac actgccatgt actactgtgc gactagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggggccaggg gaccctggtc 360
accgtctcct ca 372
<210> 6
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 6
caggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctgggtt cccctttact agctccgtca tgggatggtt ccgccaggct 120
ccagggaagg aacgcgaggg ggtcgcagct atttcggttg atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccaacaa cacgctgtat 240
ctgcaaatga acagcctgaa acctgaggac actgccatgt actactgtgc ggctagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggggccaggg gacccaggtc 360
accgtctcct ca 372
<210> 7
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 7
gaggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctggatt cccctttagt aacaacgtca tgggctggtt ccgccaggct 120
ccagggaagg aacgcgaggg ggtcgcagct atttcggtta atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccaacaa cacgctgtat 240
ctgcaaatga acagcctgaa acctgaggac actgccattt actactgtgc gactagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggagccaggg gaccctggtc 360
accgtctcct ca 372
<210> 8
<211> 372
<212> DNA
<213> Camelus bactrianus
<400> 8
gaggtgcagc tggtggagtc tgggggaggc tcggtgcaga ctggagggtc tctgagactc 60
tcctgcgcag cctctggatt cccctttagt agcagcgtca tgggctggtt ccgccaggct 120
ccaggaaagg aacgcgaggg ggtcgcagct atttcggtag atagtggtag cacatggtat 180
gccgactccg tgaagggccg attcaccatc tccctggaca gcgccagcaa cacactgtat 240
ctgcaaatga acggcctgaa acctgaggac actgccatgc actactgtgc gactagacgt 300
ggagttattc ttacactaag cccagagacc tatgactact ggggccaggg gacccaggtc 360
accgtctcct ca 372
Claims (5)
1. a kind of Porcine epidemic diarrhea virus M protein-specific heavy chain antibody, which is characterized in that the nucleotide of encoding said antibody
Sequence are as follows: SEQ ID NO.4.
2. a kind of recombinant expression carrier, it is characterised in that contain nucleotide sequence described in claim 1.
3. a kind of host cell, it is characterised in that the host cell is to contain nucleotide sequence described in claim 1
Prokaryotic cell.
4. host cell as claimed in claim 3, it is characterised in that the host cell is containing as claimed in claim 2
The prokaryotic cell of expression vector.
5. Porcine epidemic diarrhea virus M protein-specific heavy chain antibody as described in claim 1 or its coded sequence are in large intestine bar
Bacterium (Escherichia coli) in expression application.
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| CN201510985596.XA CN105504053B (en) | 2015-12-25 | 2015-12-25 | A kind of Porcine epidemic diarrhea virus M protein-specific heavy chain antibody |
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| CN107304419A (en) * | 2016-04-22 | 2017-10-31 | 中国农业科学院兰州兽医研究所 | The yeast cDNA library and its construction method and purposes of a kind of swine fever virus resistant VHH antibody |
| CN108892723B (en) * | 2018-07-12 | 2021-09-21 | 内蒙古农业大学 | Single-domain heavy chain antibody for detecting porcine epidemic diarrhea virus, preparation method and application |
| CN109678953A (en) * | 2018-12-24 | 2019-04-26 | 西北农林科技大学 | A kind of construction method and purposes of the VHH phage display library of anti-PEDV N protein |
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| CN109517060B (en) | 2020-10-27 |
| CN109517060A (en) | 2019-03-26 |
| CN109438574B (en) | 2020-10-27 |
| CN109438573B (en) | 2020-11-10 |
| CN105504053B (en) | 2019-04-16 |
| CN105504053A (en) | 2016-04-20 |
| CN109400702B (en) | 2020-11-10 |
| CN109438573A (en) | 2019-03-08 |
| CN109400702A (en) | 2019-03-01 |
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