CN105944093A - Application of DNA vaccine for M29 epitope gene of periodic brugia malayi - Google Patents
Application of DNA vaccine for M29 epitope gene of periodic brugia malayi Download PDFInfo
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- CN105944093A CN105944093A CN201610398014.2A CN201610398014A CN105944093A CN 105944093 A CN105944093 A CN 105944093A CN 201610398014 A CN201610398014 A CN 201610398014A CN 105944093 A CN105944093 A CN 105944093A
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Abstract
The invention discloses application of a DNA vaccine for an M29 epitope gene of periodic brugia malayi. The periodic brugia malayi popular in China is used as the research object, a myosin gene segment of the brugia malayi is amplified, and a myosin eukaryotic expression recombinant plasmid of the periodic brugia malayi is constructed. According to sequencing result analysis, the amino acid sequence of the periodic brugia malayi is speculated, then relevant software is utilized for predicting the B cell epitope and the T cell epitope of the periodic brugia malayi, and the myosin epitope gene vaccine for the periodic brugia malayi is prepared. A BALB/c mouse is immunized and inoculated with the vaccine, and the response effects of the vaccine on humoral immunity and cellular immunity are detected. The test result proves that the vaccine can induce the mouse to produce specific immune responses, a satisfying effect is achieved, and it is successful to prepare the myosin epitope gene vaccine for the periodic brugia malayi.
Description
The application is application number: 201410564361.9, applying date 2014.10.21, title " Periodic Brugia M29
The preparation method of epitope gene DNA vaccination " divisional application.
Technical field
The present invention relates to the preparation method of a kind of Periodic Brugia M29 epitope gene DNA vaccination.
Background technology
Filariasis is one of the most ancient global disease.Front Gu Ai in 4000 according to Cairo, EGY Museum Exhibit
And Pharaoh's statue, display suffers from right lower extremity elephatiasis, is one of this disease typical clinical manifestations.According to WHO report, the whole world has 83
Countries and regions have lymph filarial infection person about 1.2 hundred million, wherein bancroftosis about 1.07 hundred million, filariasis malayi and Timor's silk
Parasitosis the most about 13,000,000.The clinical manifestation of about 4400 universal Filariasis in these the infecteds, about 76,000,000 is microfilaremia
Disease person.Estimate that there is compromised population in the whole world more than 1,100,000,000, account for the 20% of total world population.China was once whole world Filariasis
One of the most serious popular country, compromised population reaches 3.3 hundred million.Although the preventing and treating of filaricide achieves huge in the world
Achievement, but owing to climate warming etc. is natural, biological and society and the nocturnal periodicity of lymph filaricide and microfilaremia
Many being widely present without factors such as clinical symptoms, occur epidemic situation resume combustion and becoming of spreading in recent years in some countries and regions
Gesture, the popular of filaricide brings serious harm not only to the health of the people, also becomes one of major reason of driving into poverty by medical crises.Up-to-date
Research report shows, sustainable more than 20 years of the microfilaremia of the infected's Residual source of infection, intermediate density and higher density are micro-
Silk larva of a tapeworm or the cercaria of a schistosome mass formed by blood stasis person has the effect propagating filaricide.So the monitoring in later stage is the most arduous with the task of preventing and treating.
Mainly Filaria philippinensis and Wuchereria malayi that China is popular.The latter's life cycle is more complicated, mainly includes that larva exists
With adult growth course in human body in mosquito body, additionally can reach maturity in the multiple vertebrates body beyond human body.
Filariasis may result in patient and forever or for a long time disables, and is classified as the second-biggest-in-the-world disease that disables by WHO fierce.Find and control filaricide
The research of vaccine is increasingly paid attention to by people.Screening being effectively protected property antigen also organically combines to obtain best protection effect
It it is an important content of vaccine research.Myosin (myosin) is a kind of function egg being widely present in eukaryote
In vain, it is not only present in myocyte, and there is also in non-myocyte.It is as a kind of important contractile protein of organism
Matter, plays an important role at the regulation aspect such as muscle contraction and cell restructuring.Molecular biology about parasite myosin
Show that it is a kind of dominant molecule of early immune with the research in terms of immunology, there is more significant immunogenicity, immune animal
Stronger immanoprotection action can be produced.This is also the reason that researcher is devoted to myosin molecular vaccine and drug research.
Summary of the invention
It is an object of the invention to provide a kind of method simplicity, easily operate, effective Periodic Brugia M29 epi-position
The preparation method of gene DNA vaccine.
The technical solution of the present invention is:
The preparation method of a kind of Periodic Brugia M29 epitope gene DNA vaccination, is characterized in that: include
The following step:
(1) design of primers
According to Periodic Brugia myosin gene in GenBank, (highly conserved sequence district applies Primer
Premier5.0 software design primer, and introduce Xho I/BamH I restriction enzyme site respectively, initial termination codon and protectiveness
Base；
P1: upstream 5 ' CCGGA TCC ATG AAA TGC AAA AAA T‐3’
Underlined sequences is BamH I restriction enzyme site Tm=56.84
P2: downstream 5 ' CCCTC GAG ATG GTG AAC GGA GTA CG‐3’
Underlined sequences is Xho I restriction enzyme site Tm=66.90
(2) Periodic Brugia polypide and the collection of microfilariae of ohchocerciasis and the extraction of total serum IgE and mensuration
(1) adult and microfilariae of ohchocerciasis of taking from meriones unguiculatus peritoneal fluid are moved in 1.5ml homogenizer, add 1mlTrizol
Reagent grinds, and room temperature stands 5min；
(2) adding 0.2ml chloroform, stand 2min after concussion 15s, 4 DEG C, 12000rpm is centrifuged 15min and takes supernatant；
(3) adding the mixing of 0.5ml isopropanol, room temperature stands 10min, and 4 DEG C, 12000rpm is centrifuged 10min and abandons supernatant；
(4) adding the mixing of 1ml 75% ethanol, 4 DEG C, 9000rpm is centrifuged 5min and abandons supernatant；
(5) it is dissolved in DEPC after being dried 5min and processes water 30ul, 60 DEG C of 10min；
(6) take 2ul total serum IgE and dilute 200 times, ultraviolet spectrophotometer is surveyed OD260 and OD280 value, determines its concentration
And purity, and carry out formaldehyde electrophoresis detection；
(3) synthesis of cDNA
(1) total serum IgE 5ul is taken, rear addition 10mM dNTPmix 1ul, 0.5ug/ul oligo (dT) 12 18ul, DEPC
Process water 3ul, 65 DEG C of heating 5min, rear ice bath 5min；
(2) separately taking 10 × Buffer 2ul, 25mM MgCl2 4ul, 0.1M DTT 2ul, RNase inhibitor 1ul mix,
Hatch 2min for 42 DEG C；
(3) step (2) mixed liquor is added mixing in step (1) material, add 1ul reverse transcriptase Superscript
II mixing；Hatching 50min for 42 DEG C, 70 DEG C of 15min terminate reaction, and 70 DEG C save backup；
(4) PCR expands Bm myosin gene
P1=56.84, P2=66.90, reaction system cDNA 1.5ul, 10 × PCR Buffer 2.5ul, 2.5mM
The each 0.7ul of dNTPmix 4.0ul, P1 P2,5U/ul TaqDNA polymeric protease 0.2ul, ddH2O 15.4ul；Mixing is at DNA
The enterprising performing PCR of amplification instrument PTC 100；Loop parameter is: 94 DEG C of 3min, 94 DEG C of 50s, 51 DEG C of 45s, 72 DEG C of 90s, and totally 33 are followed
Ring, 72 DEG C of extension times of last circulation are 7min, and 4 DEG C of coolings terminate reaction；Set up negative control simultaneously.PCR produces
Thing is identified through 1.0% agarose gel electrophoresis；
(5) Bm myosin genetic fragment purification and the connection of carrier T and conversion
(1) purification Bm myosin genetic fragment: take 50ulPCR product through 1.0% agarose gel electrophoresis, at uviol lamp
The lower cutting gel containing genes of interest, reclaims test kit explanation by glue, and purification reclaims product；
(2) the colibacillary preparation of competence: bacillus coli DH 5 alpha is 37 DEG C of overnight incubation on fresh LB agar flat board；Choose
Take single bacterium colony in 3ml LB culture medium, 37 DEG C of shaken overnight；Take 300ul bacterium solution and add in 30ml LB culture medium, 37 DEG C
220rpm vibrates 4h, ice bath 1h, after be dispensed into 1.5ml Eppendorf pipe 4 DEG C from, 8000rpm 5min；Abandon supernatant, add ice
Bath 0.1mol/L MgCl2 100ul suspends, and 4 DEG C are centrifuged, and 8000rpm 5min abandons supernatant, adds ice bath 0.1mol/L
CaCl210% glycerite 300ul suspends, and 70 DEG C save backup；
(3) Bm myosin gene and the connection of pGEM carrier T: take PCR primer 3ul of purification, 2 × quickly connect buffering
Liquid 5ul, pGEM carrier T 1ul, T4DNA ligase 3weiss/ul 1ul, altogether 10ul mixing, 4 DEG C connect 20h；
(4). convert: the bacillus coli DH 5 alpha competent cell 300ul taking the fresh preparation of addition of ligation reaction 10ul mixes
Even, ice bath 30min, 42 DEG C of heat shocks 90s, it is quickly moved to ice bath 3min, adds 200ul LB culture medium, hatch 45min for 37 DEG C.
Culture 100ul is coated in containing X gal, on 1.5% agar plate of IPTG, Amp, is inverted flat board, 37 DEG C of incubated overnight；
(6) screening of Positive recombinant clones and qualification
(1) screening of Positive recombinant clones: the white bacterial plaque that picking growth conditions is good, and extract plasmid；
(2) PCR identifies: with recombiant plasmid Bm myosin/pGEM T as template, enter with primer P1, P2 of Bm myosin
Performing PCR reacts, reaction system 25ul, Bm myosin/pGEM T recombiant plasmid 1.5ul, 10 × PCR Buffer 2.5ul,
2.5mM dNTPmix4.0ul, each 0.7ul of P1, P2,5U/ul TaqDNA polymeric protease 0.2ul, ddH2O 15.4ul；Circulation
Parameter is: 94 DEG C of 3min, 94 DEG C of 50s, 51 DEG C of 45s, 72 DEG C of 90s, totally 33 circulations, during 72 DEG C of extensions of last circulation
Between be 7min, 4 DEG C cooling terminate reaction；PCR primer is identified through 1.0% agarose gel electrophoresis；
(3) enzyme action is identified: the PCR that learns from else's experience identifies correct recombiant plasmid, with BamH I and Xho I double digestion, uses 1.0% fine jade
Sepharose electrophoresis detection endonuclease bamhi；
(7) Bm MYOSIN secondary structure prediction
SOPMA, GOR, nnPredic, HNN method on application EXPASY server and EMBOSS program are analyzed respectively
The secondary structure of prediction Bm myosin；
(8) Bm-MYOSIN hydrophilic, surface accessibility, antigenicity, polarity and pliability parameter prediction
Use Hopp&Woods hydrophilic parameter, Emini surface accessibility parameter, Jameson Wolf antigenicity parameter,
Zimmerman polarity parameters and pliability parameter prediction；
(9) Bm MYOSIN t cell epitope prediction
(1) people source HLA class Ⅰmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selects a length of 9 mers of AA, and genotype is HLA A0201, HLA A1101, it was predicted that HLA class Ⅰmolecule
Binding peptide, retains the result of output；
(2) Mus source MHC class Ⅰmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selects a length of 9 mers of AA, and genotype is H2 d, including H2 Kd, H2 Ld and H2 Dd, for H2 d type
The MHC class Ⅰmolecule that mice is expressed；Prediction MHC class Ⅰmolecule binding peptide, retains the result of output；
(3) people source HLA class Ⅱmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, Select gene type is HLA DRB1*0101, HLA DRB1*0301, HLA DRB1*0401, HLA DRB1*
0701, HLA DRB1*0801, HLA DRB1*0901, HLA DRB1*1101, HLA DRB1*1301, HLA DRB1*1501, in advance
Survey HLA class Ⅱmolecule binding peptide, retain the result of output；
(4) Mus source MHC class Ⅱmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selecting Select gene type is I Ad, I Ed, it was predicted that Mus source MHC class Ⅱmolecule binding peptide, retains output
Result；
(10) selection of epitope gene fragment
Predict the outcome according to B cell Antigen Epitope Prediction and t cell epitope, select genetic fragment 562bp rich in epitope
1269bp designs primer, with plasmid pcDNA3.1 (+) BmM55 is as template, and this fragment is cloned into prokaryotic expression carrier pET
28a (+) in, build pET BmM29.Application Primer 5 software design primer；
Upstream P1:5 ' GCGGATCCGCTAATGAATTGAATATGC 3 '
Wherein GGATCC is BamH I restriction enzyme site；
Downstream P2:5 ' CGGAATTCCTATGGTGAACGGAGTACGGT
Wherein GAATTC is EcoR I restriction enzyme site；
Primer dissolves with ddH2O before using, and concentration is 10 μm ol/L；
(11) epitope gene fragment PCR expands
(1) with pcDNA3.1 (+) BmM55 is as template, P1, P2 are respectively upstream and downstream primer, reaction system:
Pcr amplification reaction system
Amplified reaction parameter is:
Take 5 μ l samples, 1% agarose gel electrophoresis detection PCR amplifying target genes；
(12) genes of interest is connected with carrier and identifies
A, PCR primer and pET 28a (+) vector plasmid double digestion system:
Double digestion reaction system
Genes of interest is connected with carrier, concrete reaction system:
Genes of interest and carrier coupled reaction system
Mixing, more than room temperature reaction 30min, product is used for converting；
The preparation of B, E.coli DH5 α competent cell
(1) go bail for inoculating loop and be stored in 80 DEG C of DH5 α bacterium solution, draw bacterium on the LB flat board without antibiotic, 37 DEG C of inversions
Cultivate about 14 16h to occur to single bacterium colony；
(2) single bacterium colony is chosen to 5ml nonresistant LB liquid, 37 DEG C of shaken cultivation about 10 12h；
(3) taking the bacterium solution of 1ml incubated overnight to containing in 100ml nonreactive LB liquid, 37 DEG C of shaken cultivation about 2 2.5h, to OD value
Reach 0.5, ice bath 5 10min；
(4) being dispensed into 2 aseptic centrifuge tubes of 50ml pre-cooling, 4 DEG C, 1600rpm is centrifuged 7min；
(5) with the 0.1M CaCl2 solution re-suspended cell that 10ml is ice-cold, 4 DEG C, 1100rpm is centrifuged 5min；
(6), with the 0.1M CaCl2 solution re-suspended cell that 10ml is ice-cold, after placing 30min on ice, 4 DEG C, 1100rpm is centrifuged
5min；
(7) with the 0.1M CaCl that 2ml is ice-cold2Solution re-suspended cell, after subpackage, 15% glycerol is frozen in 80 DEG C；
C, convert and identify
(1) taking 100 μ l and be stored in 80 DEG C of calcification bacterium, ice bath melts；Add 10 μ l and connect product, mix gently, ice bath
30min；
(2) heat shock, 42 DEG C of water-bath 30 90s, do not move；
(3) it is quickly transferred in ice bath, cools down 1 2min；
(4) add 2.25ml LB liquid to test tube, then add 0.25ml mixture, slant setting, 37 DEG C, 100rpm shaken cultivation
45min；
(5) 5000rpm is centrifuged 1min；
(6) abandoning part supernatant, be poured on the LB flat board containing Amp after mixing, be coated with uniformly with spreader, room temperature stands, until
Liquid is absorbed, and 37 DEG C of incubators are inverted and are cultivated 12 16h；
(7) contain the LB liquid of Amp with white rifle choicest monoclonal to 5ml, 37 DEG C, 220rpm shaken cultivation 12 16h, to OD value
Between 0.6 0.8；
(8) do positive control, negative control transformation reaction by above-mentioned steps simultaneously；
(9) extract plasmid and carry out plasmid electroresis appraisal and PCR qualification；
(10) choose PCR and identify positive bacterium solution, check order after amplification in LB fluid medium；
(13) BmM29 epitope gene construction of eukaryotic expression vector
Purification purpose epitope gene sub-clone to eukaryotic expression vector pcDNA3.1 (+) BamH I and EcoR I gram
Grand site.The mol ratio of genes of interest and carrier is 5:1, reaction system 25ul, and 16 DEG C of water-baths connect overnight；Take connection liquid to convert
Competence bacillus coli DH 5 alpha, coats on LB Amp flat board, wherein containing Amp100mg, 37 DEG C of incubated overnight in every mlLB；From
On LB Amp flat board, the random single bacterium colony of picking, is inoculated in LB Amp culture medium respectively, and 37 DEG C of shaken overnight are cultivated, and extract weight
Group plasmid, through BamH I and EcoR I enzyme action, rear 1.0% agarose gel electrophoresis is identified；
(14) BmM29 epitope gene vaccine immune response is tested
A.pcDNA3.1 (+) and pcDNA3.1 (+) BmM29 plasmid extracts in a large number
(1) bacterium solution taking 100ml incubated overnight adds 50ml centrifuge tube, and 12000rpm is centrifuged 3min and collects antibacterial, as far as possible
Abandon most supernatant；
(2) 12000rpm is centrifuged 3min, with pipettor remaining a small amount of liquid sucking-off；
(3) add the solution 1 of 10ml plasmid a large amount of extraction agent box, use turbula shaker and pipettor to hang by cell
Floating, without small bacteria block；
(4) adding the solution 2 of 10ml plasmid a large amount of extraction agent box, the most leniently spin upside down 68 times, room temperature stands
5min；
(5) adding the solution 4 of 10ml plasmid a large amount of extraction agent box, the most leniently spin upside down 68 times, room temperature stands
10min, 12000rpm are centrifuged 20min, are all poured in Filter column by solution, slowly promote push handle, filtrate collection 50ml from
In heart pipe；
(6) adding 8ml isopropanol in filtrate, transfer to adsorption column after mixing, 12000rpm is centrifuged 2min, abandons in collecting pipe
Waste liquid；
(7) adding 3ml in adsorption column and remove endotoxin buffer, room temperature stands 2min, 12000rpm and is centrifuged 2min, abandons collection
Waste liquid in pipe；
(8) adding rinsing liquid W2 in adsorption column, 12000rpm is centrifuged 2min, abandons the waste liquid in collecting pipe.It is repeated once；
(9) adsorption column placing back in collecting pipe, 12000rpm is centrifuged 5min, removes liquid remaining in adsorption column.
(10) adsorption column is placed in clean 50ml collecting pipe, adds 1ml eluent TE, room temperature stand 5min, 12000rpm from
Heart 2min；
(11) with normal saline, the plasmid of purification being diluted to final concentration of 1mg/ml, 20 DEG C save backup.
In step (12) C (7), OD value is 0.7.
A kind of immunological adjuvant, is characterized in that: sequence is as follows: CpG ODN 1,826 5 ' TCCATGACGTTCCTGACGTT
3 ', and the modification of chain phosphorothioate backbone strengthens its nuclease resistant entirely.
The inventive method is easy, easily operate, effective.The present invention is right for research with the Periodic Brugia that China is popular
As, expand Wuchereria malayi myosin genetic fragment, construct Periodic Brugia myosin Eukaryotic expression recombinant plasmid
(pcDNA3.1(+)‐Bm‐myosin).According to sequencing result analysis, thus it is speculated that its aminoacid sequence, then utilize relevant software
Predict their B cell epi-position and t cell epitope, prepare Periodic Brugia myosin epitope gene vaccine.Should
Vaccine virus immunization BALB/c mouse, and detect the humoral immunization of its vaccine and the response effect of cellular immunization.Result of the test is demonstrate,proved
Understand that this vaccine can produce specific immune response by inducing mouse, obtain promising result, manufacturing cycle type Wuchereria malayi
Myosin epitope gene vaccine succeeds.
Below in conjunction with embodiment, the invention will be further described.
Detailed description of the invention
One, design of primers
According to the highly conserved sequence district of Periodic Brugia myosin gene in GenBank (Bm myosin), should
With Primer Premier5.0 software design primer, and introduce Xho I/BamH I restriction enzyme site respectively, initial termination codon with
And protectiveness base, primer is synthesized by Shanghai bio-engineering corporation.
P1: upstream 5 ' CCGGA TCC ATG AAA TGC AAA AAA T‐3’
Underlined sequences is BamH I restriction enzyme site Tm=56.84
P2: downstream 5 ' CCCTC GAG ATG GTG AAC GGA GTA CG‐3’
Underlined sequences is Xho I restriction enzyme site Tm=66.90
Two, Periodic Brugia polypide and the collection of microfilariae of ohchocerciasis and the extraction of total serum IgE and mensuration
1. the adult and microfilariae of ohchocerciasis of taking from meriones unguiculatus peritoneal fluid are moved in 1.5ml homogenizer, add 1mlTrizol examination
Agent is fully ground, and room temperature stands 5min.
2. adding 0.2ml chloroform, stand 2min after concussion 15s, 4 DEG C, 12000rpm is centrifuged 15min and takes supernatant.
3. adding the mixing of 0.5ml isopropanol, room temperature stands 10min, and 4 DEG C, 12000rpm is centrifuged 10min and abandons supernatant.
4. adding the mixing of 1ml75% ethanol, 4 DEG C, 9000rpm is centrifuged 5min and abandons supernatant.
5. it is dissolved in DEPC after being dried 5min and processes water 30ul, 60 DEG C of 10min.
6. take 2ul total serum IgE dilute 200 times, on ultraviolet spectrophotometer survey OD260 and OD280 value, determine its concentration with
Purity, and carry out formaldehyde electrophoresis detection.
Three, the synthesis of cDNA
1. taking total serum IgE 5ul, rear addition 10mM dNTPmix 1ul, 0.5ug/ul oligo (dT) 12 18ul, at DEPC
Reason water 3ul, 65 DEG C of heating 5min, rear ice bath 5min.
The most separately take 10 × Buffer 2ul, 25mM MgCl2 4ul, 0.1M DTT 2ul, RNase inhibitor 1ul mixing,
Hatch 2min for 42 DEG C.
3. step 2 mixed liquor addition step 1 is mixed, add 1ul reverse transcriptase Superscript II mixing, 42 DEG C
Hatching 50min, 70 DEG C of 15min terminate reaction, and 70 DEG C save backup.
Four, PCR expands Bm-myosin gene
P1=56.84, P2=66.90, reaction system cDNA 1.5ul, 10 × PCR Buffer 2.5ul, 2.5mM
The each 0.7ul of dNTPmix 4.0ul, P1 P2,5U/ul TaqDNA polymeric protease 0.2ul, ddH2O 15.4ul.Mixing is at DNA
The enterprising performing PCR of amplification instrument PTC 100.Loop parameter is: 94 DEG C of 3min, 94 DEG C of 50s, 51 DEG C of 45s, 72 DEG C of 90s, and totally 33 are followed
Ring, 72 DEG C of extension times of last circulation are 7min, and 4 DEG C of coolings terminate reaction.Set up negative control simultaneously.PCR produces
Thing is identified through 1.0% agarose gel electrophoresis.
Five, Bm-myosin genetic fragment purification and the connection of carrier T and conversion
1. purification Bm myosin genetic fragment: take 50ulPCR product through 1.0% agarose gel electrophoresis, under uviol lamp
The cutting gel containing genes of interest, reclaims test kit explanation by glue, and purification reclaims product.
2. the colibacillary preparation of competence: bacillus coli DH 5 alpha is 37 DEG C of overnight incubation on fresh LB agar flat board.Choose
Take single bacterium colony in 3ml LB culture medium, 37 DEG C of shaken overnight.Take 300ul bacterium solution and add in 30ml LB culture medium, 37 DEG C
220rpm vibrates 4h, ice bath 1h, after be dispensed into 1.5ml Eppendorf pipe 4 DEG C from, 8000rpm 5min.Abandon supernatant, add ice
Bath 0.1mol/L MgCl2 100ul suspends, and 4 DEG C are centrifuged, and 8000rpm 5min abandons supernatant, adds ice bath 0.1mol/L
CaCl210% glycerite 300ul suspends, and 70 DEG C save backup.
3.Bm myosin gene and the connection of pGEM carrier T: take PCR primer 3ul of purification, 2 × quickly connect buffering
Liquid 5ul, pGEM carrier T (50ng) 1ul, T4DNA ligase 3weiss/ul 1ul, altogether 10ul mixing, 4 DEG C connect 20h.
4. convert: take ligation reaction 10ul and add the bacillus coli DH 5 alpha competent cell 300ul mixing of fresh preparation,
Ice bath 30min, 42 DEG C of heat shocks 90s, it is quickly moved to ice bath 3min, adds 200ul LB culture medium, hatch 45min for 37 DEG C.Will
Culture 100ul is coated in containing X gal, on 1.5% agar plate of IPTG, Amp, is inverted flat board, 37 DEG C of incubated overnight.
Six, the screening of Positive recombinant clones and qualification
1. the screening of Positive recombinant clones: the white bacterial plaque that picking growth conditions is good, and extract plasmid.
2.PCR identifies: with recombiant plasmid Bm myosin/pGEM T as template, carry out with the primer P1 P2 of Bm myosin
PCR reacts, reaction system 25ul, Bm myosin/pGEM T recombiant plasmid 1.5ul, 10 × PCR Buffer 2.5ul, 2.5mM
The each 0.7ul of dNTPmix4.0ul, P1 P2,5U/ul TaqDNA polymeric protease 0.2ul, ddH2O 15.4ul.Loop parameter
For: 94 DEG C of 3min, 94 DEG C of 50s, 51 DEG C of 45s, 72 DEG C of 90s, totally 33 circulations, 72 DEG C of extension times of circulation are for the last time
7min, 4 DEG C of coolings terminate reaction.PCR primer is identified through 1.0% agarose gel electrophoresis.
3. enzyme action is identified: the PCR that learns from else's experience identifies correct recombiant plasmid, with BamH I and Xho I double digestion, uses 1.0% fine jade
Sepharose electrophoresis detection endonuclease bamhi.
Seven, Bm-MYOSIN secondary structure prediction
Respectively the SOPMA in application EXPASY server (http://www.expasy.ch/tools), GOR,
nnPredict(University of California at SanFrancisco(UCSF))、HNN(Hierarchical
NeuralNetwork method, Guermeur, 1997) method and two grades of EMBOSS program analyses and prediction Bm myosin
Structure.
Eight, Bm-MYOSIN hydrophilic, surface accessibility, antigenicity, polarity and pliability parameter prediction
Use Hopp&Woods hydrophilic parameter, Emini surface accessibility parameter, Jameson Wolf antigenicity parameter,
Zimmerman polarity parameters and pliability parameter prediction (http://www.expasy.org/cgi bin/protscale.pl)
Nine, Bm-MYOSIN t cell epitope prediction
1. people source HLA class Ⅰmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selects a length of 9 mers of AA, and genotype is HLA A0201, HLA A1101, it was predicted that HLA class Ⅰmolecule
Binding peptide, retains the result of output.
2. Mus source MHC class Ⅰmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selects a length of 9 mers of AA, and genotype is that H2 d (includes H2 Kd, H2 Ld and H2 Dd, for H2 d type
The MHC class Ⅰmolecule that mice is expressed), it was predicted that MHC class Ⅰmolecule binding peptide, retain the result of output.
3. people source HLA class Ⅱmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, Select gene type is HLA DRB1*0101, HLA DRB1*0301, HLA DRB1*0401, HLA DRB1*
0701, HLA DRB1*0801, HLA DRB1*0901, HLA DRB1*1101, HLA DRB1*1301, HLA DRB1*1501, in advance
Survey HLA class Ⅱmolecule binding peptide, retain the result of output.
4. Mus source MHC class Ⅱmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selecting Select gene type is I Ad, I Ed, it was predicted that Mus source MHC class Ⅱmolecule binding peptide, retains output
Result.
Ten, the selection of epitope gene fragment
Predict the outcome according to B cell Antigen Epitope Prediction and t cell epitope, select the genetic fragment rich in epitope
(562bp 1269bp) designs primer, with plasmid pcDNA3.1 (+) BmM55 is as template, and this fragment is cloned into prokaryotic expression
Carrier pET 28a (+) in, build pET BmM29.Application Primer 5 software design primer.
Upstream (P1): 5 ' GCGGATCCGCTAATGAATTGAATATGC 3 '
(wherein GGATCC is BamH I restriction enzyme site)；
Downstream (P2): 5 ' CGGAATTCCTATGGTGAACGGAGTACGGT
(wherein GAATTC is EcoR I restriction enzyme site).
Primer is synthesized by Shanghai Sheng Gong Bioisystech Co., Ltd, uses ddH before using2O dissolves, and concentration is 10 μm ol/L.
11, epitope gene fragment PCR amplification
1. with pcDNA3.1 (+) BmM55 is as template, P1, P2 are respectively upstream and downstream primer, and reaction system is shown in Table 1.
Table 1 pcr amplification reaction system
Amplified reaction parameter is:
Take 5 μ l samples, 1% agarose gel electrophoresis detection PCR amplifying target genes.
12, genes of interest is connected with carrier and identifies
1.PCR product and pET 28a (+) vector plasmid double digestion system is shown in Table 2.
Table 2 double digestion reaction system
Genes of interest is connected with carrier, and concrete reaction system is shown in Table 3.
Table 3 genes of interest and carrier coupled reaction system
Mixing, more than room temperature reaction 30min, product is used for converting.
The preparation of 2.E.coli DH5 α competent cell
(1) go bail for inoculating loop and be stored in 80 DEG C of DH5 α bacterium solution, draw bacterium on the LB flat board without antibiotic, 37 DEG C of inversions
Cultivate about 14 16h to occur to single bacterium colony.
(2) single bacterium colony is chosen to 5ml nonresistant LB liquid, 37 DEG C of shaken cultivation about 10 12h.
(3) taking the bacterium solution of 1ml incubated overnight to containing in 100ml nonreactive LB liquid, 37 DEG C of shaken cultivation about 2 2.5h, to OD value
Reach 0.5, ice bath 5 10min.
(4) being dispensed into 2 aseptic centrifuge tubes of 50ml pre-cooling, 4 DEG C, 1600rpm is centrifuged 7min.
(5) with the 0.1M CaCl2 solution re-suspended cell that 10ml is ice-cold, 4 DEG C, 1100rpm is centrifuged 5min.
(6), with the 0.1M CaCl2 solution re-suspended cell that 10ml is ice-cold, after placing 30min on ice, 4 DEG C, 1100rpm is centrifuged
5min。
(7) with the 0.1M CaCl2 solution re-suspended cell that 2ml is ice-cold, after subpackage, 15% glycerol is frozen in 80 DEG C.
3. convert and identify
(1) taking 100 μ l and be stored in 80 DEG C of calcification bacterium, ice bath melts；Add 10 μ l and connect product, mix gently, ice bath
30min。
(2) heat shock, 42 DEG C of water-bath 30 90s, do not move.
(3) it is quickly transferred in ice bath, cools down 1 2min.
(4) add 2.25ml LB liquid to test tube, then add 0.25ml mixture, slant setting, 37 DEG C, 100rpm shaken cultivation
45min。
(5) 5000rpm is centrifuged 1min.
(6) abandoning part supernatant, be poured on LB flat board (containing Amp) after mixing, be coated with uniformly with spreader, room temperature stands, until
Liquid is absorbed, and 37 DEG C of incubators are inverted and are cultivated 12 16h.
(7) with white rifle choicest monoclonal to 5ml LB liquid (containing Amp), 37 DEG C, 220rpm shaken cultivation 12 16h, to OD value
Between 0.6 0.8.
(8) do positive control, negative control transformation reaction by above-mentioned steps simultaneously.
(9) extract plasmid and carry out plasmid electroresis appraisal and PCR qualification.
(10) choose PCR and identify positive bacterium solution, in LB fluid medium, after amplification, serve sea English fine horse biotechnology limited
Company checks order.
13, BmM29 epitope gene construction of eukaryotic expression vector
Purification purpose epitope gene sub-clone to eukaryotic expression vector pcDNA3.1 (+) BamH I and EcoR I gram
Grand site.The mol ratio of genes of interest and carrier is 5:1, reaction system 25ul, and 16 DEG C of water-baths connect overnight.Take connection liquid to convert
Competence bacillus coli DH 5 alpha, coats on LB Amp (100mg/ml) flat board, 37 DEG C of incubated overnight.From LB Amp (100mg/
Ml) the random single bacterium colony of picking on flat board, is inoculated in LB Amp culture medium respectively, and 37 DEG C of shaken overnight are cultivated, and extract restructuring
Plasmid, through BamH I and EcoR I enzyme action, rear 1.0% agarose gel electrophoresis is identified.
14, BmM29 epitope gene vaccine immune response test
1.pcDNA3.1 (+) and pcDNA3.1 (+) BmM29 plasmid extracts in a large number
(1) bacterium solution taking 100ml incubated overnight adds 50ml centrifuge tube, and 12000rpm is centrifuged 3min and collects antibacterial, as far as possible
Abandon most supernatant.
(2) 12000rpm is centrifuged 3min, with pipettor remaining a small amount of liquid sucking-off.
(3) add the solution 1 of 10ml plasmid a large amount of extraction agent box, use turbula shaker and pipettor to hang by cell
Floating, without small bacteria block.
(4) adding the solution 2 of 10ml plasmid a large amount of extraction agent box, the most leniently spin upside down 68 times, room temperature stands
5min。
(5) adding the solution 4 of 10ml plasmid a large amount of extraction agent box, the most leniently spin upside down 68 times, room temperature stands
10min, 12000rpm are centrifuged 20min, are all poured in Filter column by solution, slowly promote push handle, filtrate collection 50ml from
In heart pipe.
(6) adding 8ml isopropanol in filtrate, transfer to adsorption column after mixing, 12000rpm is centrifuged 2min, abandons in collecting pipe
Waste liquid.
(7) adding 3ml in adsorption column and remove endotoxin buffer, room temperature stands 2min, 12000rpm and is centrifuged 2min, abandons collection
Waste liquid in pipe.
(8) adding rinsing liquid W2 in adsorption column, 12000rpm is centrifuged 2min, abandons the waste liquid in collecting pipe.It is repeated once.
(9) adsorption column placing back in collecting pipe, 12000rpm is centrifuged 5min, removes liquid remaining in adsorption column.
(10) adsorption column is placed in clean 50ml collecting pipe, adds 1ml eluent TE, room temperature stand 5min, 12000rpm from
Heart 2min.
(11) with normal saline, the plasmid of purification being diluted to final concentration of 1mg/ml, 20 DEG C save backup.
2. the preparation of immunological adjuvant CpG ODN
In novel adjuvant with non-methylated cytosine and guanylic acid the oligodeoxynucleotide (CpG as core
ODN) most representative.The sequence of CpG ODN synthesis is as follows: CpG ODN 1,826 5 ' TCCATGACGTTCCTGACGTT 3 ',
And the modification of chain phosphorothioate backbone strengthens its nuclease resistant entirely, Shanghai Ying Jun biotech firm synthesize.Molten with normal saline
Solution is configured to 1mg/ml.
3. laboratory animal packet
48 BALB/c experiment mices are weighed in sequence, divide 4 groups according to random digits table, often group 12, A:PBS
Matched group；B: adjuvant CpG matched group；C: empty carrier pcDNA3.1 (+)/CpG group；D: recombiant plasmid pcDNA3.1 (+) BmM29/
CpG group, immunization protocol be each immunity in 0,2,4 weeks once.
4. inoculation position pretreatment
DNA vaccination injection site is mice back leg tibialis anterior, and recombinant protein vaccine is subcutaneous multi-point injection.Lml is left-handed
Bupivacaine hydrochloride injection is diluted in 14ml normal saline, obtains 0.5mg/ml diluent.24h before inoculation every time, in connecing
Plant injection location left-handed bupivacaine hydrochloride 50 μ l and carry out pretreatment.
5. immunity inoculation
A:PBS 100 μ l；B: adjuvant CpG 30 μ g；C:pcDNA3.1 (+)/CpG 100 μ g/30 μ g；D:pcDNA3.1
(+)‐BmM29/CpG 100μg/30μg.Immunity 3 times, every minor tick 2 weeks altogether.
14, immune response detection
1. serum collection: collecting mice serum by eyeball excise method in 4,6,8 weeks after initial immunity, often group takes 4
Mice.Room temperature stand 1h, put 4 DEG C overnight, serum to be separated out, 4 DEG C, 4000rpm is centrifuged 10min.Subpackage serum, is stored in 80
℃。
2. IgG detection in immune serum
(1) antigen coated: with antigen coated buffer, antigen diluent to be become 5 μ g/mL, with 100 μ l/ hole coated elisa plates, 4
DEG C overnight；
(2) abandon liquid, wash 3 times with PBST.Using 100 μ l/ hole confining liquids to close, room temperature stands 1h；
(3) liquid is abandoned, after serum antibody diluent is according to 1:100 dilution proportion, 100 μ l/ holes, room temperature 2h；
(4) wash 3 times with PBST；
(5) after the IgG antibody with sample diluting liquid 1:2000 dilution HRP coupling, 100 μ l/ holes, room temperature 1h；
(6) PBST is used to wash 3 times；
(7) add 100 μ l/ hole substrate solutions, after effect 15min, add 50 μ l 2mol/L H2SO4Terminate reaction；
(8) at 450nm, measure light absorption value, preserve data.
3. mouse boosting cell collection
(1) within after initial immunity 8 weeks, mice is put to death；
(2) take aseptic 10ml screw socket pipe, add 3ml lymphocyte separation medium, 37 DEG C of preheating 2h；
(3) mice of execution is put 2 3min in 75% ethanol solution to carry out disinfection；
(4) by left for mice veutro upward, with tweezers, left for mice skin of abdomen is mentioned gently, cut about 1cm with operating scissors
The long edge of a knife, tears skin of abdomen with hands, exposes peritoneum, it is seen that red strip spleen, by its careful separation.
(5) 100 mesh copper sieves are put in the plate containing 3ml Hank ' s liquid, spleen is placed on copper sieve, first spleen is torn
Broken, then be lightly ground with Glass rod, until the most remaining connective tissue on copper sieve, then rinse copper sieve with 3mlHank ' s liquid；
(6) the screw socket pipe containing 3ml lymphocyte separation medium is tilted 45 °, with dropper by the cell suspension in plate along pipe
Wall slowly shifts (lymphocyte separation medium: cell suspension=1:2), does not break through the interface of lymphocyte separation medium；
(7) room temperature 2000rpm is centrifuged 20min, and in pipe, liquid is divided into 4 layers；
(8) the 2nd layer of extracting waste, is transferred in the 50ml centrifuge tube containing 10ml Hank ' s liquid, and room temperature 1000rpm is centrifuged
10min；
(9) abandoning supernatant liquid, add 10ml Hank ' s liquid, blow and beat mixing gently, room temperature 1000rpm is centrifuged 10min；
(10) abandon supernatant liquid, add 10ml Hank ' s liquid, blow and beat mixing gently, count with counting chamber；
(11) room temperature 1000rpm is centrifuged 10min, abandons supernatant liquid, adds appropriate complete medium and makes end of cell dense
Degree is 2 × 106cells/ml.
4. the inducing of cytokine
24 orifice plates add 2 × 106cells/ml cell suspension 475 μ l/ hole, and every hole adds 100 μ l/ml ConA 25 μ l extremely
Final concentration of 5 μ g/ml, hatch 48h for 37 DEG C in 5%CO2 incubator.5000rpm is centrifuged 10min and collects culture fluid, takes supernatant accurate
Standby detection.
5.INF γ and IL 4 assay
(1) shifting to an earlier date 20min and take out the ELISA kit being saved in 4 DEG C, balance is to room temperature；
(2) concentrated cleaning solution ddH2O is diluted 20 times；
(3) from balance to the sealing bag of room temperature taking-up ELISA Plate, add standard sample (160pg/ml, 80pg/ml,
40pg/ml, 20pg/ml, 10pg/ml, 0pg/ml) each 50ul；
(4) from balancing to the sealing bag of room temperature taking-up ELISA Plate, in addition to blank well, it is separately added into sample diluting liquid
40ul and testing sample 10ul；
(5) in addition to blank well, in standard sample wells and sample well, every hole adds the detection antibody of horseradish peroxidase-labeled
100 μ l, seal reacting hole with shrouding film, hatch 30min for 37 DEG C；
(6) discarding liquid, pat dry in absorbent paper, cleaning mixture is filled it up with in every hole, stands 1min, gets rid of cleaning mixture, in water suction
Pat dry on paper, so repeat to wash plate 5 times；
(7) every hole is initially charged each 50 μ l of developer A, B, and 37 DEG C of lucifuges hatch 15min；
(8) every hole adds stop buffer 50 μ l, in 15min, measures the OD value in each hole at 450nm wavelength；
(9) OD value is calculated: the OD value of each standard substance and specimen deducts the OD value of blank well；
(10) drawing standard curve: make abscissa with standard concentration, corresponding OD value is made vertical coordinate, is drawn out standard substance
Linear regression curves；
(11) concentration of this sample can be found on standard curve by the OD value of sample.
6. data analysis
Application SPSS19.0 statistics software analysis sample data, measurement data represents with mean ± standard deviation, Mouse Blood
The OD of clear antibody450Value, mouse boosting cell culture supernatant compare employing between the group of cytokine IFN γ and IL 4 level
One factor analysis of variance, between group, multiple comparisons uses SNK (Student Newman Keuls) method.P < 0.05 has statistics for difference
Learn meaning.
Table 4 immune serum antibody OD450 pH-value determination pH
Note: * represents and is respectively compared with three matched groups, and difference is statistically significant, P ＜ 0.05.
Different immunity packet mouse cytokine INF γ and IL 4 level (pg/ml) of table 5
Note: * represents and is respectively compared with three matched groups, and difference is statistically significant, P ＜ 0.05.
Periodic Brugia myosin genetic fragment is amplified by success of the test.Through 1.0% agarose gel electricity
Swimming detection, Bm myosin amplified fragments size is consistent substantially with intended 1292bp.Gene sequencing and offer on GeneBank
Sequence blast result of the comparison, homology is 98%, it was demonstrated that cloned sequence is correct.Its expressing protein is 431 aminoacid.Combine
The B cell epi-positions such as the secondary structure prediction of conjunction Bm MYOSIN albumen and hydrophilic, surface accessibility, polarity and pliability parameter
Predict the outcome, and t cell epitope predictive study result, select the genetic fragment (562bp 1269bp) rich in epitope,
By eukaryotic expression vector pcDNA3.1 (+) plasmid is connected with BmM29 genes of interest fragment, build pcDNA3.1 (+) BmM29 is true
Nuclear expression carrier, prepares Periodic Brugia M29 epitope gene DNA vaccination.
By this epitope gene DNA vaccination immunity inoculation BALB/c mouse back leg tibialis anterior, immune mouse is carried out vaccine and exempts from
Epidemic disease effect detection, measures IgG and splenocyte cytokine INF γ and IL 4 content in immune serum.Result shows: exempt from
Epidemic disease mice produces high level specific IgG antibodies, hence it is evident that higher than matched group (the equal ＜ of P 0.05).Along with the increase of immune time, exempt from
The OD450 value of epidemic disease mouse IgG antibody is in rising trend.Immune cell factor testing result shows: immune group mouse boosting cell is trained
Support in supernatant the level of cytokine IFN γ and IL 4 obviously higher than matched group, be statistically significant (P all <
0.05).Above the results show Periodic Brugia M29 epitope gene DNA vaccination immunity inoculation can produce by inducing mouse
Specific humoral and cellular immune response responsing reaction, obtains promising result.Periodic Brugia M29 epitope gene DNA vaccination
Prepare successfully.
Claims (4)
1. a Periodic Brugia M29 epitope gene DNA vaccination produces IgG and splenocyte cytokine INF γ in induction
Application with in the preparation of IL 4, is characterized in that: the preparation method of described Periodic Brugia M29 epitope gene DNA vaccination
Comprise the following steps:
(1) design of primers
According to Periodic Brugia myosin gene in GenBank, (highly conserved sequence district applies Primer
Premier5.0 software design primer, and introduce Xho I/BamH I restriction enzyme site respectively, initial termination codon and protectiveness
Base；
P1: upstream 5 ' CCGGA TCC ATG AAA TGC AAA AAA T‐3’
Underlined sequences is BamH I restriction enzyme site Tm=56.84
P2: downstream 5 ' CCCTC GAG ATG GTG AAC GGA GTA CG‐3’
Underlined sequences is Xho I restriction enzyme site Tm=66.90
(2) Periodic Brugia polypide and the collection of microfilariae of ohchocerciasis and the extraction of total serum IgE and mensuration
(1) adult and microfilariae of ohchocerciasis of taking from meriones unguiculatus peritoneal fluid are moved in 1.5ml homogenizer, add 1mlTrizol reagent
Grinding, room temperature stands 5min；
(2) adding 0.2ml chloroform, stand 2min after concussion 15s, 4 DEG C, 12000rpm is centrifuged 15min and takes supernatant；
(3) adding the mixing of 0.5ml isopropanol, room temperature stands 10min, and 4 DEG C, 12000rpm is centrifuged 10min and abandons supernatant；
(4) adding the mixing of 1ml 75% ethanol, 4 DEG C, 9000rpm is centrifuged 5min and abandons supernatant；
(5) it is dissolved in DEPC after being dried 5min and processes water 30ul, 60 DEG C of 10min；
(6) take 2ul total serum IgE and dilute 200 times, ultraviolet spectrophotometer is surveyed OD260 and OD280 value, determines its concentration and pure
Degree, and carry out formaldehyde electrophoresis detection；
(3) synthesis of cDNA
(1) total serum IgE 5ul is taken, rear addition 10mM dNTPmix 1ul, 0.5ug/ul oligo (dT) 12 18ul, DEPC process
Water 3ul, 65 DEG C of heating 5min, rear ice bath 5min；
(2) separately taking 10 × Buffer 2ul, 25mM MgCl2 4ul, 0.1M DTT 2ul, RNase inhibitor 1ul mix, 42 DEG C
Hatch 2min；
(3) step (2) mixed liquor is added mixing in step (1) material, add 1ul reverse transcriptase Superscript II and mix
Even；Hatching 50min for 42 DEG C, 70 DEG C of 15min terminate reaction, and 70 DEG C save backup；
(4) PCR expands Bm myosin gene
P1=56.84, P2=66.90, reaction system cDNA 1.5ul, 10 × PCR Buffer 2.5ul, 2.5mM dNTPmix
The each 0.7ul of 4.0ul, P1 P2,5U/ul TaqDNA polymeric protease 0.2ul, ddH2O 15.4ul；Mixing is at DNA cloning instrument
The enterprising performing PCR of PTC 100；Loop parameter is: 94 DEG C of 3min, 94 DEG C of 50s, 51 DEG C of 45s, 72 DEG C of 90s, totally 33 circulations, finally
Once 72 DEG C of extension times of circulation are 7min, and 4 DEG C of coolings terminate reaction；Set up negative control simultaneously.PCR primer warp
1.0% agarose gel electrophoresis is identified；
(5) Bm myosin genetic fragment purification and the connection of carrier T and conversion
(1) purification Bm myosin genetic fragment: take 50ulPCR product through 1.0% agarose gel electrophoresis, in uviol lamp incision
Cutting the gel containing genes of interest, reclaim test kit explanation by glue, purification reclaims product；
(2) the colibacillary preparation of competence: bacillus coli DH 5 alpha is 37 DEG C of overnight incubation on fresh LB agar flat board；Picking list
Bacterium colony in 3ml LB culture medium, 37 DEG C of shaken overnight；Taking 300ul bacterium solution to add in 30ml LB culture medium, 37 DEG C of 220rpm shake
Swing 4h, ice bath 1h, after be dispensed into 1.5ml Eppendorf pipe 4 DEG C from, 8000rpm 5min；Abandon supernatant, add ice bath
0.1mol/L MgCl2 100ul suspends, and 4 DEG C are centrifuged, and 8000rpm 5min abandons supernatant, adds ice bath 0.1mol/L CaCl2‐
10% glycerite 300ul suspends, and 70 DEG C save backup；
(3) Bm myosin gene and the connection of pGEM carrier T: take PCR primer 3ul of purification, 2 × rapid ligation buffer
5ul, pGEM carrier T 1ul, T4DNA ligase 3weiss/ul 1ul, altogether 10ul mixing, 4 DEG C connect 20h；
(4). convert: take ligation reaction 10ul and add the bacillus coli DH 5 alpha competent cell 300ul mixing of fresh preparation, ice
Bath 30min, 42 DEG C of heat shocks 90s, it is quickly moved to ice bath 3min, adds 200ul LB culture medium, hatch 45min for 37 DEG C.Will training
Support thing 100ul and be coated in containing X gal, on 1.5% agar plate of IPTG, Amp, be inverted flat board, 37 DEG C of incubated overnight；
(6) screening of Positive recombinant clones and qualification
(1) screening of Positive recombinant clones: the white bacterial plaque that picking growth conditions is good, and extract plasmid；
(2) PCR identifies: with recombiant plasmid Bm myosin/pGEM T as template, carry out PCR with primer P1, P2 of Bm myosin
Reaction, reaction system 25ul, Bm myosin/pGEM T recombiant plasmid 1.5ul, 10 × PCR Buffer 2.5ul, 2.5mM
DNTPmix4.0ul, P1, each 0.7ul of P2,5U/ul TaqDNA polymeric protease 0.2ul, ddH2O 15.4ul；Loop parameter
For: 94 DEG C of 3min, 94 DEG C of 50s, 51 DEG C of 45s, 72 DEG C of 90s, totally 33 circulations, 72 DEG C of extension times of circulation are for the last time
7min, 4 DEG C of coolings terminate reaction；PCR primer is identified through 1.0% agarose gel electrophoresis；
(3) enzyme action is identified: the PCR that learns from else's experience identifies correct recombiant plasmid, with BamH I and Xho I double digestion, uses 1.0% agarose
Detected through gel electrophoresis endonuclease bamhi；
(7) Bm MYOSIN secondary structure prediction
SOPMA, GOR, nnPredic, HNN method on application EXPASY server and EMBOSS program analyses and prediction respectively
The secondary structure of Bm myosin；
(8) Bm-MYOSIN hydrophilic, surface accessibility, antigenicity, polarity and pliability parameter prediction
Use Hopp&Woods hydrophilic parameter, Emini surface accessibility parameter, Jameson Wolf antigenicity parameter,
Zimmerman polarity parameters and pliability parameter prediction；
(9) Bm MYOSIN t cell epitope prediction
(1) people source HLA class Ⅰmolecule combines the prediction of epi-position: with FASTA form, the AA sequence of myosin is inputted Rankpep
Server, selects a length of 9 mers of AA, and genotype is HLA A0201, HLA A1101, it was predicted that HLA class Ⅰmolecule binding peptide,
Retain the result of output；
(2) Mus source MHC class Ⅰmolecule combines the prediction of epi-position: with FASTA form, the AA sequence of myosin is inputted Rankpep
Server, selects a length of 9 mers of AA, and genotype is H2 d, including H2 Kd, H2 Ld and H2 Dd, for H2 d type mice table
The MHC class Ⅰmolecule reached；Prediction MHC class Ⅰmolecule binding peptide, retains the result of output；
(3) people source HLA class Ⅱmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, Select gene type is HLA DRB1*0101, HLA DRB1*0301, HLA DRB1*0401, HLA DRB1*
0701, HLA DRB1*0801, HLA DRB1*0901, HLA DRB1*1101, HLA DRB1*1301, HLA DRB1*1501, in advance
Survey HLA class Ⅱmolecule binding peptide, retain the result of output；
(4) Mus source MHC class Ⅱmolecule combines the prediction of epi-position: the AA sequence of myosin inputted with FASTA form
Rankpep server, selecting Select gene type is I Ad, I Ed, it was predicted that Mus source MHC class Ⅱmolecule binding peptide, retains output
Result；
(10) selection of epitope gene fragment
Predict the outcome according to B cell Antigen Epitope Prediction and t cell epitope, select genetic fragment 562bp rich in epitope
1269bp designs primer, with plasmid pcDNA3.1 (+) BmM55 is as template, and this fragment is cloned into prokaryotic expression carrier pET
28a (+) in, build pET BmM29.Application Primer 5 software design primer；
Upstream P1:5 ' GCGGATCCGCTAATGAATTGAATATGC 3 '
Wherein GGATCC is BamH I restriction enzyme site；
Downstream P2:5 ' CGGAATTCCTATGGTGAACGGAGTACGGT
Wherein GAATTC is EcoR I restriction enzyme site；
Primer dissolves with ddH2O before using, and concentration is 10 μm ol/L；
(11) epitope gene fragment PCR expands
(1) with pcDNA3.1 (+) BmM55 is as template, P1, P2 are respectively upstream and downstream primer, reaction system:
Pcr amplification reaction system
Amplified reaction parameter is:
Take 5 μ l samples, 1% agarose gel electrophoresis detection PCR amplifying target genes；
(12) genes of interest is connected with carrier and identifies
A, PCR primer and pET 28a (+) vector plasmid double digestion system:
Double digestion reaction system
Genes of interest is connected with carrier, concrete reaction system:
Genes of interest and carrier coupled reaction system
Mixing, more than room temperature reaction 30min, product is used for converting；
The preparation of B, E.coli DH5 α competent cell
(1) go bail for inoculating loop and be stored in 80 DEG C of DH5 α bacterium solution, draw bacterium on the LB flat board without antibiotic, be inverted for 37 DEG C and cultivate
About 14 16h occur to single bacterium colony；
(2) single bacterium colony is chosen to 5ml nonresistant LB liquid, 37 DEG C of shaken cultivation about 10 12h；
(3) bacterium solution of 1ml incubated overnight is taken to containing in 100ml nonreactive LB liquid, 37 DEG C of shaken cultivation about 2 2.5h, reach to OD value
0.5, ice bath 5 10min；
(4) being dispensed into 2 aseptic centrifuge tubes of 50ml pre-cooling, 4 DEG C, 1600rpm is centrifuged 7min；
(5) with the 0.1M CaCl2 solution re-suspended cell that 10ml is ice-cold, 4 DEG C, 1100rpm is centrifuged 5min；
(6), with the 0.1M CaCl2 solution re-suspended cell that 10ml is ice-cold, after placing 30min on ice, 4 DEG C, 1100rpm is centrifuged
5min；
(7) with the 0.1M CaCl that 2ml is ice-cold2Solution re-suspended cell, after subpackage, 15% glycerol is frozen in 80 DEG C；
C, convert and identify
(1) taking 100 μ l and be stored in 80 DEG C of calcification bacterium, ice bath melts；Add 10 μ l and connect product, mix gently, ice bath 30min；
(2) heat shock, 42 DEG C of water-bath 30 90s, do not move；
(3) it is quickly transferred in ice bath, cools down 1 2min；
(4) add 2.25ml LB liquid to test tube, then add 0.25ml mixture, slant setting, 37 DEG C, 100rpm shaken cultivation
45min；
(5) 5000rpm is centrifuged 1min；
(6) abandoning part supernatant, be poured on the LB flat board containing Amp after mixing, be coated with uniformly with spreader, room temperature stands, until liquid
Being absorbed, 37 DEG C of incubators are inverted and are cultivated 12 16h；
(7) with white rifle choicest monoclonal to 5ml containing the LB liquid of Amp, 37 DEG C, 220rpm shaken cultivation 12 16h, exist to OD value
Between 0.6 0.8；
(8) do positive control, negative control transformation reaction by above-mentioned steps simultaneously；
(9) extract plasmid and carry out plasmid electroresis appraisal and PCR qualification；
(10) choose PCR and identify positive bacterium solution, check order after amplification in LB fluid medium；
(13) BmM29 epitope gene construction of eukaryotic expression vector
Purification purpose epitope gene sub-clone to eukaryotic expression vector pcDNA3.1 (+) the clone position of BamH I and EcoR I
Point.The mol ratio of genes of interest and carrier is 5:1, reaction system 25ul, and 16 DEG C of water-baths connect overnight；Take connection liquid and convert impression
State bacillus coli DH 5 alpha, coats on LB Amp flat board, wherein containing Amp100mg, 37 DEG C of incubated overnight in every mlLB；From LB
The random single bacterium colony of picking on Amp flat board, is inoculated in LB Amp culture medium respectively, and 37 DEG C of shaken overnight are cultivated, and extract restructuring
Plasmid, through BamH I and EcoR I enzyme action, rear 1.0% agarose gel electrophoresis is identified；
(14) BmM29 epitope gene vaccine immune response is tested
A.pcDNA3.1 (+) and pcDNA3.1 (+) BmM29 plasmid extracts in a large number
(1) bacterium solution taking 100ml incubated overnight adds 50ml centrifuge tube, and 12000rpm is centrifuged 3min and collects antibacterial, abandons to the greatest extent as far as possible
Supernatant；
(2) 12000rpm is centrifuged 3min, with pipettor remaining a small amount of liquid sucking-off；
(3) add the solution 1 of 10ml plasmid a large amount of extraction agent box, use turbula shaker and pipettor by cell suspension, nothing
Small bacteria block；
(4) adding the solution 2 of 10ml plasmid a large amount of extraction agent box, the most leniently spin upside down 68 times, room temperature stands
5min；
(5) adding the solution 4 of 10ml plasmid a large amount of extraction agent box, the most leniently spin upside down 68 times, room temperature stands
10min, 12000rpm are centrifuged 20min, are all poured in Filter column by solution, slowly promote push handle, filtrate collection 50ml from
In heart pipe；
(6) adding 8ml isopropanol in filtrate, transfer to adsorption column after mixing, 12000rpm is centrifuged 2min, abandons giving up in collecting pipe
Liquid；
(7) adding 3ml in adsorption column and remove endotoxin buffer, room temperature stands 2min, 12000rpm and is centrifuged 2min, abandons in collecting pipe
Waste liquid；
(8) adding rinsing liquid W2 in adsorption column, 12000rpm is centrifuged 2min, abandons the waste liquid in collecting pipe.It is repeated once；
(9) adsorption column placing back in collecting pipe, 12000rpm is centrifuged 5min, removes liquid remaining in adsorption column.
(10) adsorption column is placed in clean 50ml collecting pipe, adds 1ml eluent TE, and it is centrifugal that room temperature stands 5min, 12000rpm
2min；
(11) with normal saline, the plasmid of purification being diluted to final concentration of 1mg/ml, 20 DEG C save backup.
Periodic Brugia M29 epitope gene DNA vaccination the most according to claim 1 is thin at induction generation IgG and spleen
Application in the preparation of born of the same parents cytokine INF γ and IL 4, is characterized in that: in step (12) B (2), 37 DEG C of shaken cultivation are about
10h。
Periodic Brugia M29 epitope gene DNA vaccination the most according to claim 1 is thin at induction generation IgG and spleen
Application in the preparation of born of the same parents cytokine INF γ and IL 4, is characterized in that: in step (12) B (2), 37 DEG C of shaken cultivation are about
11h。
Periodic Brugia M29 epitope gene DNA vaccination the most according to claim 1 is thin at induction generation IgG and spleen
Application in the preparation of born of the same parents cytokine INF γ and IL 4, is characterized in that: in step (12) B (2), 37 DEG C of shaken cultivation are about
12h。
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| CN201610398014.2A Expired - Fee Related CN105944093B (en) | 2014-10-21 | 2014-10-21 | The purposes of Periodic Brugia M29 epitope gene DNA vaccination |
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| CN114062675A (en) * | 2021-10-13 | 2022-02-18 | 东莞市莞城医院 | Experimental method for long-term immune effect of cTfh cells on hepatitis B vaccine based on cohort |
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| CN103191420A (en) * | 2013-04-01 | 2013-07-10 | 南通大学 | Preparation method of periodic wuchereria malayi compound multivalent DNA (deoxyribonucleic acid) vaccine |
| CN103298485A (en) * | 2010-11-15 | 2013-09-11 | 伊利诺伊大学理事会 | Multivalent vaccine for filariasis |
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| CN103298485A (en) * | 2010-11-15 | 2013-09-11 | 伊利诺伊大学理事会 | Multivalent vaccine for filariasis |
| CN103191420A (en) * | 2013-04-01 | 2013-07-10 | 南通大学 | Preparation method of periodic wuchereria malayi compound multivalent DNA (deoxyribonucleic acid) vaccine |
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| 谢东方等: "马来丝虫肌球蛋白基因序列及编码产物预测", 《中国公共卫生》 * |
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| CN114062675A (en) * | 2021-10-13 | 2022-02-18 | 东莞市莞城医院 | Experimental method for long-term immune effect of cTfh cells on hepatitis B vaccine based on cohort |
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| CN105944093B (en) | 2019-06-14 |
| CN104368014B (en) | 2017-04-12 |
| CN104368014A (en) | 2015-02-25 |
| CN105999251A (en) | 2016-10-12 |
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