CN1673370A

CN1673370A - Method for preparing transient expression recombination protein chicken salpingo biological reactor

Info

Publication number: CN1673370A
Application number: CN 200510038300
Authority: CN
Inventors: 孙怀昌
Original assignee: Yangzhou University
Current assignee: Yangzhou University
Priority date: 2005-01-28
Filing date: 2005-01-28
Publication date: 2005-09-28
Anticipated expiration: 2025-01-28
Also published as: CN1300314C

Abstract

The construction of transitory state expressing recombinant protein chicken oviduct bioreactor belongs to the field of genetic engineering and biomedicine preparation technology. The technological scheme of the present invention includes molecular cloning chicken egg white protein gene regulating sequence, constructing and optimizing high efficiency expression vector of chicken oviduct, selecting gene transfection agent, and selecting recombinant vector injecting method, dosage and time. Compared with available technology, the present invention has the advantages of no surgical operation, being economic and practical, high expression level of target gene, long expression maintaining time, complete activity of expression product, etc. The recombinant protein may be used in medicine, food, feed additive.

Description

The manufacture method of transient expression recombination protein chicken salpingo biological reactor

Technical field

The invention belongs to genetically engineered and field of biological pharmacy.

Background technology

At present, medicinal Recombinant Protein Expression system mainly contains bacterial expression, animal cell expression and transgenic animal bio-reactor.Bacterial expression system is typical case's representative with intestinal bacteria, its technical difficulty is little, production cost is lower, existing recombinant protein is used escherichia coli expression more, but the recombinant protein of expressing generally can not carry out effective folding, processing and modification, and mostly be insoluble inclusion body, and not only active low or nothing, and unfavorable to the purifying of purpose product.The great advantage of animal cell expression is the fully active of product, but expression level is generally on the low side, and production cost is higher.The transgenic animal bio-reactor is to utilize genetically engineered and embryo engineering technology, with the genome of the valuable proteic transgenosis of coding to animal, with the tissues of transgenic animal or organ as the biological factory of producing recombinant protein, has the active outstanding advantage such as complete and pollution-free of expression level height, expression product, has very bright industrialization prospect, but its technical difficulty is very big, and many theory and technology difficult problems all remain to be broken through.

For preparation transgenic animal bio-reactor, chicken has very outstanding advantage, its uterine tube portion of expanding is the natural factory of synthetic proteins, protein content in the egg white is up to 100 grams per liters, and can carry out correct processing and modification to albumen, so expression product is fully active, feeding cost is low in addition, the generation interval (lead time) short, the advantages such as easily collecting and difficult pollution of laying eggs, and is particularly suitable as the bio-reactor of producing recombinant protein.

The poultry salpingo biological reactor is to utilize the expression regulation sequence of ovalbumin gene to instruct foreign gene to express in the chicken salpingo cell, from egg white, obtain a kind of technology of expression product, comprise that the transgenic chicken salpingo biological reactor and the laying hen gene transfection of setting up with transgenic technology are the uterine tube transient expression bio-reactor on basis.The transgenic chicken salpingo biological reactor has inheritance stability, the high outstanding advantage of expression level, the preparation method mainly contains retrovirus mediated method, sperm infection protocol, archeocyte transfection transfer methods, development of chick embryo blastodisc injection and embryonic stem cell method, but its technical difficulty is all very big, does not still have the report of the transgenic chicken bio-reactor with industrialization prospect at present.The shortcoming of uterine tube transient expression bio-reactor be foreign gene can not heredity, expression level is low and the time is of short duration, but its technical difficulty is little, many at present experimental models as research egg white powder gene expression regulation mechanism and the quality test of chicken salpingo localization and expression carrier.Up to now, only Japanese scientist attempted in 2002 with vivo gene electronics perforation method, the alkaline phosphatase gene that makes the people obtains to express in the oviduct cell of chicken and egg white, but this method not only needs special plant and instrument, chicken is anaesthetized and surgical operation, and the expression level of recombinase very low (nanograms/milliliter) in the egg white, hold time very short (less than 4 days), so there is not practical value.

Summary of the invention

The objective of the invention is to set up the manufacture method of simple, non-operation, economic, practical transient expression recombination protein chicken salpingo biological reactor.

Technical scheme of the present invention comprises the selection of selection, recombinant vectors injecting method, dosage and the number of times of the structure of molecular cloning, chicken ovalbumine high efficiency expression vector of chicken ovalbumine gene regulation and control sequence and optimization, gene transfection agent:

A, molecular cloning chicken ovalbumine gene regulation and control sequence: according to the chicken ovalbumin gene sequence of having delivered (GenBank accession number GI:212504) design primer, with the Langshan genomic dna is template, is respectively 5 of 3.0kb ' and 3 ' chicken ovalbumine gene regulation and control sequence with high-fidelity polymerase chain reaction (PCR) amplification length;

B, structure chicken salpingo specific expression carrier: cosmid vector pHC is modified acquisition pHC20 carrier; Eukaryotic expression vector pcDNA3.0 is modified acquisition pcDNA2.2 carrier; With 5 of chicken ovalbumin gene ' and 3 ' regulating and controlling sequence be cloned into the pHC20 carrier simultaneously, obtain pOV1 chicken salpingo specific expression carrier; With 5 of chicken ovalbumin gene ' and 3 ' regulating and controlling sequence be cloned into the pcDNA2.2 carrier simultaneously, obtain pOV2 chicken salpingo specific expression carrier; 5 ' regulating and controlling sequence of chicken ovalbumin gene is cloned into the pcDNA2.2 carrier separately, obtains pOV3 chicken salpingo specific expression carrier;

C, three kinds of chicken salpingo specifically expressing recombinant vectorss that will contain human tissue kallikrein cDNA (accession number is GI:22027643) mix with selected chicken vivo gene transfection agents 25kDa PEI, and ratio is 1 micrograms of DNA: 2 microlitre PEI; Through wing intravenous injection laying hen, the injection total dose is 2～3 milligrams of recombinant vectorss respectively, divides injection once or twice.

Compare with existing similar technology, this invention not only has non-operation, advantage such as economic, practical, and the expression level height of goal gene, expresses the fully active of long, the expression product of holding time.Be expressed in recombinant protein in the egg white both can purifying after as the medicine of control people, animal disease, also can not purifiedly directly develop (deciding) on concrete albumen as the mankind's healthcare products or the fodder additives of animal.

The present invention is included in increase Xcm I, Eco RI, Pst I, Sma I, Bam HI, Spe I, Xba I, Eag I restriction enzyme site between its Sal I and the Not I restriction site to the modification of pHC cosmid vector.

The present invention is modified to SV40 virus sequence and Xin Meisu (neo) resistant gene that removes wherein to the pcDNA3.0 carrier for expression of eukaryon.

The concentration of chicken vivo gene transfection agents 25kDa polymine (PEI) is 10 mg/ml among the present invention.

Description of drawings

The chicken salpingo specific expression carrier structural representation of Fig. 1 for making up.

Embodiment:

1, the molecular cloning of chicken ovalbumine gene regulation and control sequence: according to the chicken ovalbumin gene sequence of having delivered (GenBank accession number GI:212504) design primer, genome DNA extracting method extraction Langshan genomic dna with routine is a template, with the high-fidelity polymerase Pyrobest DNA Polymerase amplification chicken ovalbumin gene 5 of the precious biotech firm in Dalian ' and 3 ' regulating and controlling sequence, through 1% agarose gel electrophoresis analysis, the result shows conform to the size of expectation (being respectively 3kb) with the amplified production that obtains; With ligase enzyme pcr amplification product is connected with commercial PCR product cloning carrier pGEM-T respectively, connect product and transform DH5 α competent escherichia coli cell, on the LB agar plate through containing penicillin and X-gal after the overnight incubation, the picking white colony carries out liquid culture and preparation plasmid DNA, prove through determined dna sequence, in the recombinant plasmid 5 ' and preceding 500 Nucleotide of 3 ' chicken ovalbumine gene regulation and control sequence and chicken ovalbumin gene (the GenBank accession number GI:212504) indifference of publishing, the recombinant plasmid of acquisition is called after pGEM5 ' and pGEM3 ' respectively.

2, the structure of chicken salpingo specific expression carrier:

Utilize conventional gene manipulation techniques that pHC cosmid vector and pcDNA3.0 eukaryotic expression vector are transformed and modified.Modification to the pHC cosmid vector comprises with Sal I and Not I restriction enzyme digestion pHC carrier, removal sheet is therebetween had no progeny and is connected the carrier called after pHC20 of acquisition with the pcr amplification segment that contains Sal I, Xcm I, Eco RI, Pst I, Sma I, BamHI, Spe I, Xba I, Eag I, Not I restriction enzyme site.The modification of pcDNA3.0 eukaryotic expression vector comprised use the PvuII enzymic digestion, remove wherein SV40 virus sequence and neomycin resistance gene (neo), the carrier called after pcDNA2.2 after reconnecting.

With restriction enzyme Sal I and BamH I 5 ' control region of chicken ovalbumin gene is cut out from pGEM5 ' plasmid, be connected with the pHC20 carrier of same enzymic digestion, the recombinant plasmid that obtains Xho I and Not I enzymic digestion, and be connected the chicken salpingo specific expression carrier called after pOV1 of acquisition with the 3 ' regulating and controlling sequence that from pGEM3 ' plasmid, cuts out with same enzyme; With identical strategy with 5 of chicken ovalbumin gene ' and 3 ' regulating and controlling sequence be cloned into the pcDNA2.2 carrier simultaneously, the chicken salpingo specific expression carrier called after pOV2 of acquisition; With Sal I and Xho I enzymic digestion pcDNA2.2 carrier, be connected the chicken salpingo specific expression carrier called after pOV3 of acquisition with 5 ' regulating and controlling sequence of the chicken ovalbumin gene that from pGEM5 ' plasmid, cuts out with same enzyme.Three kinds of carriers structure see accompanying drawing.

Be used to clone the PCR primer of chicken ovalbumine gene regulation and control sequence

5 ' control region forward primer:

5-TTGTCGACGCAGACTGACATGCATITCATAGG-3

5 ' control region reverse primer:

5-ATGGATCCCTCGAGGGTGAACTCTGAGTTGTCTAGAGC-3

3 ' control region forward primer:

5-ATCTCGAGAGAGTGGCATCAATGGCTTCTGAG-3

3 ' control region reverse primer:

5-ATGCGGCCGCATTGGACACACTGCTCCAGATGAG-3

3, the expression characterization of chicken salpingo expression vector is identified: cut three kinds of chicken salpingo specific expression carriers with Xho I enzyme, be connected with the lacZ reporter gene that from commercialization plasmid pSV-β-galactosidase, cuts out respectively behind the end-filling, the recombinant vectors that obtains is called after pOV1lacZ respectively, pOV2lacZ, pOV3lacZ, intestinal bacteria with its conversion carry out the LB liquid culture, the alkaline bleach liquor cleavage method and the PEG precipitator method with standard prepare recombinant plasmid, three kinds of recombinant plasmids of purifying are with after chicken vivo gene transfection agents 25kDaPEI mixes, respectively through wing intravenous injection laying hen, every chicken after collecting one piece of egg is slaughtered it, get its heart, liver, spleen, kidney and oviduct tissue, activity by commercially available reagent box explanation carrying out beta-galactosidase enzymes detects, the result is presented in chicken salpingo cell and the egg white can detect betagalactosidase activity, and at the heart, liver, spleen, can not detect betagalactosidase activity in the tissues such as kidney, prove that three kinds of carriers can not only instruct reporter gene to express in oviduct cell, expression has the favorable tissue specificity, and expression product can be secreted in the egg white, meet the design requirements of chicken salpingo specific expression carrier, wherein higher with the expression level of pOV3.

4, the selection of gene transfection agent: three kinds of recombinant vectorss that will contain the lacZ reporter gene respectively with commercial liposome (Lipofectamine ^TMReagent), the PEI of 100kDa and 25kDa mixes, inject laying hen then respectively and carry out the activity detection of recombinase, found that the expression level and the liposome no significant difference of PEI bag suppressed by vector, and the toxicity of 100kDa PEI is stronger, final selection 25kDa PEI is a transfection agents, and working concentration is 10 mg/ml.

5, the selection of gene injection dosage and number of times: the human tissue kallikrein cDNA that will be cloned in the pGEM-T plasmid with Xho I restriction enzyme cuts out, be connected with three kinds of chicken salpingo specifically expressing recombinant vectorss that same enzyme cuts respectively, the alkaline bleach liquor cleavage method and the PEG precipitator method with standard prepare recombinant plasmid from the reorganization bacterium that obtains is cultivated, mix with selected chicken vivo gene transfection agents PEI, ratio is 1 micrograms of DNA: 2 microlitre PEI, respectively through wing intravenous injection laying hen, the injection total amount is 2-3 milligram recombinant vectors altogether, divide (next day) injection once or twice, collect egg then, carry out the determination of activity of tissue kallikrein by the method for standard, the result shows that three kinds of carriers all can instruct the expression of goal gene in the chicken salpingo cell, expression product can be secreted in the egg white, wherein the expression level with pOV3 is the highest, the enzymic activity of peak period is up to the 58U/ milliliter, and expression time kept about 10 days.

6, chicken breed is to the influence of expression level: selecting new Yangzhou laying hen and green-shell egg chicken is experimental subjects, carries out the determination of activity of gene injection and enzyme with the method for above-mentioned foundation, and the result shows the horizontal no significant difference of the exogenous gene expression of two kind chickens.

7, duplicate injection is to the influence of expression level: first gene injection and recombinase express drop to gene injection before during level, use the same method and dosage test chicken is carried out gene injection once more, enzyme assay result in the egg white shows, the expression level of injection back recombinase is slightly high than initial injection once more, illustrates that test chicken can inject and utilize repeatedly.

8, the evaluation of recombinase: the Ovum Gallus domesticus album of recombinant vectors being injected forward and backward collection carries out polyacrylamide gel electrophoresis, carry out immunoblotting with the human tissue kallikrein specific monoclonal antibody, compare with the Ovum Gallus domesticus album before the recombinant vectors injection, two bands that molecular weight is respectively 36-37kDa and 43kDa appear in the Ovum Gallus domesticus album after the recombinant vectors injection, the former conforms to the molecular weight of natural human tissue kallikrein, and the latter keeps 7 amino acid whose protoenzymes; The egg white that will contain recombinase carries out the determination of activity of enzyme then with the damping fluid dilution of different pH, the result show recombinase in the egg white at pH less than 4.0 with greater than 10.0 o'clock non-activities, activity is all arranged between pH5.0-10.0, the activity during with pH7.0 is the highest; The egg white that will contain recombinase is respectively at 37 ℃, 55 ℃, hatched 30 minutes for 75 ℃ and 100 ℃, carry out the determination of activity of enzyme then, the result is hatched in the process under 37 ℃, enzymic activity is earlier in rising trend, rise to the 340U/ milliliter by original 48U/ milliliter in the time of 30 minutes, this is human tissue kallikrein self activated result under 37 ℃ of temperature, be downtrending gradually after 30 minutes, but hatch enzymic activity after 60 minutes and still be higher than 37 ℃ of enzymic activitys before hatching, the thermostability of recombinase under other temperature condition is similar to the natural human tissue kallikrein that has reported, hatches active completely dissolve in 30 minutes for 100 ℃; Gavage spontaneous hypertensive rat with the egg white that contains different units recombinase, regularly measure the caudal artery diastolic pressure of rat with conventional method then, result 7 hours after gavaging 2,4,6 unit recombinases, the blood pressure of Hypertensive Rats all has obvious decline, when gavaging 2 days of 4 and 6 unit recombinases, blood pressure and the normal rat of the same age of test rat are approaching, return to the preceding level that gavages then gradually.

In sum, the chicken salpingo expression vector that the present invention makes up can not only effectively instruct lacZ reporter gene and human tissue kallikrein gene to express in the chicken salpingo cell, and expresses and have stronger tissue specificity, and wherein the expression level of pOV3 is the highest.The physical signs such as lay eggs of recombinant vectors injection chicken does not have obvious influence, to hold time be about 10 days to Recombinant Protein Expression behind twice gene injection, the horizontal no significant difference of the exogenous gene expression of different varieties chicken, duplicate injection does not have obvious influence to the external source gene expression dose, illustrates that the chicken salpingo transient expression recombination protein technology of being set up has versatility and practicality.The recombinase that is expressed in the egg white has the molecular weight identical with natural enzyme, thermostability, active pH scope and hypotensive activity, illustrates that the physics and chemistry of recombinase and biological characteristics are identical with natural enzyme.Recombinant vectors method (being not included in the present invention) purifying gained from the reorganization bacterium culture of high density fermentation of design voluntarily, with low cost, the human tissue kallikrein activity that is expressed in the Ovum Gallus domesticus album is up to 58 units per ml, can reach 340 units per ml after 37 ℃ of activation, near 1 mg/ml, prove that the chicken salpingo transient expression recombination protein bio-reactor of setting up has higher expression level and good industrialization development is worth with the human lysozyme of expressing with quadrat method.

Claims

1, the manufacture method of transient expression recombination protein chicken salpingo biological reactor may further comprise the steps:

A, molecular cloning chicken ovalbumine gene regulation and control sequence: according to the chicken ovalbumin gene sequence of having delivered (GenBank accession number GI:212504) design primer, with the Langshan genomic dna is template, is respectively 5 of 3.0kb ' and 3 ' chicken ovalbumine gene regulation and control sequence with high-fidelity polymerase chain reaction (PCR) clone length;

B, structure chicken salpingo specific expression carrier: the pHC cosmid vector is modified acquisition pHC20 carrier; The pcDNA3.0 carrier for expression of eukaryon is modified acquisition pcDNA2.2 carrier; With 5 of chicken ovalbumin gene ' and 3 ' regulating and controlling sequence be cloned into the pHC20 carrier simultaneously, obtain pOV1 chicken salpingo specific expression carrier; With 5 of chicken ovalbumin gene ' and 3 ' regulating and controlling sequence be cloned into the pcDNA2.2 carrier simultaneously, obtain pOV2 chicken salpingo specific expression carrier; 5 ' regulating and controlling sequence of chicken ovalbumin gene is cloned into the pcDNA2.2 carrier, obtains pOV3 chicken salpingo specific expression carrier;

C, three kinds of chicken salpingo specifically expressing recombinant vectorss that will contain human tissue kallikrein gene (the GenBank accession number is GI:22027643) mix with selected chicken vivo gene transfection agents 25kDa polymine (PEI), ratio is 1 micrograms of DNA: 2 microlitre PEI, respectively through wing intravenous injection laying hen, the injection total amount is 2～3 milligrams of recombinant vectorss, divides injection once or twice.

2, according to the manufacture method of the described transient expression recombination protein chicken salpingo biological reactor of claim 1, it is characterized in that: the modification to the pHC cosmid vector is included in increase Xcm I, Eco RI, Pst I, Sma I, Bam HI, Spe I, Xba I, Eag I restriction enzyme site between its Sal I and the Not I restriction site.

3, according to the manufacture method of the described transient expression recombination protein chicken salpingo biological reactor of claim 1, it is characterized in that: the pcDNA3.0 carrier for expression of eukaryon is modified to SV40 virus sequence and Xin Meisu (neo) resistant gene that removes wherein.

4, according to the manufacture method of claim 1 or 2 or 3 described transient expression recombination protein chicken salpingo biological reactors, it is characterized in that: the concentration of chicken vivo gene transfection agents 25kDa polymine (PEI) is 10 mg/ml.