CN113683680B - Recombinant I-type humanized collagen C1L1T and preparation method and application thereof - Google Patents
Recombinant I-type humanized collagen C1L1T and preparation method and application thereof Download PDFInfo
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- CN113683680B CN113683680B CN202111082088.2A CN202111082088A CN113683680B CN 113683680 B CN113683680 B CN 113683680B CN 202111082088 A CN202111082088 A CN 202111082088A CN 113683680 B CN113683680 B CN 113683680B
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- 238000007493 shaping process Methods 0.000 description 1
- 239000004208 shellac Substances 0.000 description 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 201000010153 skin papilloma Diseases 0.000 description 1
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- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000007940 sugar coated tablet Substances 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 235000010487 tragacanth Nutrition 0.000 description 1
- 239000000196 tragacanth Substances 0.000 description 1
- 229940116362 tragacanth Drugs 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 108010017949 tyrosyl-glycyl-glycine Proteins 0.000 description 1
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- 241000701161 unidentified adenovirus Species 0.000 description 1
- 241001529453 unidentified herpesvirus Species 0.000 description 1
- 229940044959 vaginal cream Drugs 0.000 description 1
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- 229940098946 vaginal ointment Drugs 0.000 description 1
- 229940044953 vaginal ring Drugs 0.000 description 1
- 239000006213 vaginal ring Substances 0.000 description 1
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- 239000013603 viral vector Substances 0.000 description 1
- 239000011534 wash buffer Substances 0.000 description 1
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/78—Connective tissue peptides, e.g. collagen, elastin, laminin, fibronectin, vitronectin or cold insoluble globulin [CIG]
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/64—Proteins; Peptides; Derivatives or degradation products thereof
- A61K8/65—Collagen; Gelatin; Keratin; Derivatives or degradation products thereof
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- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
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- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
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- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
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Abstract
The invention discloses a recombinant I-type humanized collagen C1L1T and a preparation method and application thereof. The recombinant I-type humanized collagen C1L1T provided by the invention comprises a sequence shown in SEQ ID No. 3; optionally, the recombinant type i humanized collagen C1L1T comprises the sequence shown in SEQ ID No. 2; preferably, the sequence shown in SEQ ID No.3 and the sequence shown in SEQ ID No.2 are directly linked. The recombinant I-type humanized collagen C1L1T provided by the invention has the activity of promoting cell adhesion, the amino acid sequence of the recombinant I-type humanized collagen C1L1T is selected from natural I-type human collagen amino acid sequences, the recombinant I-type humanized collagen C1L1T is applied to a human body and does not generate immune reaction, and the preparation method is simple, so that the collagen with higher yield can be obtained at low cost.
Description
Technical Field
The invention belongs to the technical field of genetic engineering, and relates to a recombinant I-type humanized collagen C1L1T and a preparation method and application thereof.
Background
Collagen (collagen) is a family of proteins that are abundant in animals and widely distributed in the skin, bones, tendons, ligaments and blood vessels of animals, is the most abundant protein in mammals, and is also an important constituent of extracellular matrix. The collagen content in human body is 25% -30% of total protein, which plays an important role in protecting and connecting various tissues and plays an important physiological function in vivo. The most abundant type I collagen in humans is approximately 85% or more, and is present in bone, skin, tendons and cornea, type II in cartilage, intervertebral discs and vitreous, and type III in blood vessels, neoskin and scar tissue.
Collagen has good biocompatibility, biodegradability and bioactivity, such as low immunogenicity, is easy to be absorbed by human body in vivo, and can promote cell proliferation, promote platelet coagulation, participate in cell migration, adhesion, etc. Therefore, the collagen is widely applied to the industries of pharmaceutical chemicals, foods, cosmetics and the like.
However, natural collagen is insoluble in water, has inhomogeneous properties, is difficult to be directly used by human body, and often needs to be treated by chemical means before being used. Collagen products sold in the current market are all obtained from animal tissues such as pigs, cows, fish and the like, have the risk of being infected by viruses, and can cause immune rejection and allergic symptoms due to incompatibility with human bodies. Therefore, collagen can only be used in cosmetics and health care products at present, and the original biological functions of collagen cannot be exerted at all.
The collagen is prepared by a genetic engineering method, so that the disease infection risk caused by the collagen extracted by a traditional method can be solved, the hydrophilicity and stability of the collagen can be improved by optimizing the amino acid sequence of the collagen, and the molecular weight of the collagen is optimized, so that the prepared collagen has good tissue compatibility, skin permeability and safety. At present, foreign research institutions cultivate mice containing human collagen genes to obtain milk containing human collagen, but the production cost is too high, the production period is too long, and large-scale production cannot be put into.
Disclosure of Invention
Problems to be solved by the invention
Aiming at the situation that the heterologous collagen in the field is easy to induce immune reaction and is not easy to be absorbed and utilized by human bodies, and the collagen utilization rate is low due to the problems of high production cost, long period, incapability of large-scale production and the like of the humanized collagen, the invention provides a recombinant I-type humanized collagen C1L1T, and simultaneously provides a preparation method and application thereof.
Solution for solving the problem
In a first aspect, the present invention provides a recombinant type I humanized collagen C1L1T, wherein the recombinant type I humanized collagen C1L1T comprises the sequence shown in SEQ ID No. 3.
Further, in the above recombinant type I humanized collagen C1L1T, optionally, the recombinant type I humanized collagen C1L1T comprises the sequence shown in SEQ ID No. 2; preferably, the sequence shown in SEQ ID No.3 and the sequence shown in SEQ ID No.2 are directly linked.
Further, in the recombinant type I humanized collagen C1L1T described above, the recombinant type I humanized collagen C1L1T comprises: a) An amino acid sequence shown in SEQ ID No. 4; b) An amino acid sequence having 90%, 92%, 95%, 96%, 97%, 98% or 99% identity to the amino acid sequence of SEQ ID No.4, and which retains the cell adhesion effect of the amino acid sequence of SEQ ID No. 4; c) An amino acid sequence of 1 or more amino acid residues added, substituted, deleted or inserted into the amino acid sequence of SEQ ID No.4, and which retains the cell adhesion effect of the amino acid sequence of SEQ ID No. 4; or d) an amino acid sequence encoded by a nucleotide sequence which hybridizes with a polynucleotide sequence encoding the amino acid sequence of SEQ ID No.4 under stringent conditions, which are medium-high stringent conditions, high stringent conditions or very high stringent conditions, and which retains the cell adhesion effect of the amino acid sequence of SEQ ID No.4.
In a second aspect, the present invention provides a polynucleotide encoding the recombinant type I humanized collagen C1L1T described above.
In a third aspect, the present invention provides an expression vector comprising the polynucleotide described above.
In a fourth aspect, the invention provides a host cell comprising an expression vector as described above.
In a fifth aspect, the present invention provides a method for producing the recombinant type I humanized collagen C1L1T, comprising the steps of: (1) culturing the host cell provided in the fourth aspect of the present invention described above in a medium and producing the protein; (2) harvesting and purifying the protein, preferably purifying the protein with a Ni column and/or anion exchange chromatography; and (3) optionally cleaving the protein, preferably with a PPase protease.
In a sixth aspect, the present invention provides the use of the recombinant type I humanized collagen C1L1T described above for the preparation of a product, wherein the product is preferably a tissue engineering product, a cosmetic, a health product or a pharmaceutical.
In a seventh aspect, the present invention provides a product comprising the recombinant type I humanized collagen C1L1T described above, wherein the product is preferably a tissue engineering product, a cosmetic, a health product or a pharmaceutical.
In an eighth aspect, the present invention provides the use of the recombinant type I humanized collagen C1L1T described above for the preparation of a product having a cell adhesion promoting effect.
ADVANTAGEOUS EFFECTS OF INVENTION
Through implementation of the technical scheme, the recombinant type I humanized collagen C1L1T prepared by the invention has better cell adhesion effect compared with the type I collagen, the amino acid sequence is selected from natural collagen amino acid sequences, the recombinant type I humanized collagen C1L1T can not generate immune response when being applied to human bodies, and meanwhile, the preparation method is simple, so that the collagen with higher yield can be obtained at low cost.
Drawings
FIG. 1 is a plasmid map of recombinant expression vector pET32a-C1L1T, wherein the corresponding amino acid sequence of C1L1T is SEQ ID No.4.
FIG. 2 is a diagram of protein electrophoresis after induced expression of protein C1L 1T; the protein C1L1T purified by the Ni column is shown in the lane 1, the protein C1L1T digested by PPase is shown in the lane 2, and the molecular weight Marker is shown in the lane 3.
FIG. 3 shows the results of measurement of adhesion activity of human collagen and protein C1L1T cells.
Detailed Description
The following describes embodiments of the present invention, but the present invention is not limited thereto. Unless otherwise indicated, the instrumentation, reagents, materials, etc., used in the present invention are all available through conventional commercial means.
In the present specification, the meaning of "can" includes both the meaning of performing a certain process and the meaning of not performing a certain process. In this specification, "optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
In the present specification, "tissue engineering product" means a product for tissue engineering. Tissue engineering is an emerging discipline for constructing tissues or organs in vitro or in vivo by combining cell biology and material science.
In this specification, "medical device" refers to instruments, devices, appliances, in vitro diagnostic reagents and calibrators, materials and other similar or related items for direct or indirect use on the human body.
In the present invention, the type I collagen sequence is selected as the screening optimized sequence. The sequence of human collagen type I COL1A1 is NCBI reference sequence: NP-000079 (SEQ ID No. 1), seehttps://www.ncbi.nlm.nih.gov/ protein/NP_000079.2。
The bold underlined parts of the above sequences are the amino acid sequences selected in the present invention. The applicant has found through extensive research that the above sequences are selected to achieve better adhesion than commercial human collagen. In the present invention, the recombinant type I humanized collagen C1L1T is not the full length sequence of SEQ ID No. 1.
In the present invention, the sequence of SEQ ID No.2 used is: GAPGPCCGG (SEQ ID No. 2), which is a terminal sequence peptide that enhances collagen activity.
The recombinant type I humanized collagen can be C1L1T and has a single-chain structure, and comprises 222 amino acid residues. Wherein the N-terminal amino acid sequence is GPMGPSGPRGLPGPPGAPGPQGFQGPPGEPGEPGASGPMGPRGPPGPPGKNGDDGEAGKPGRPGERGPPGPQGARGLPGTAGLPGMKGHRGFSGLDGAKGDAGPAGPKGEPGSPGENGAPGQMGPRGLPGERGRPGAPGPAGARGNDGATGAAGPPGPTGPAGPPGFPGAVGAKGEAGPQGPRGSEGPQGVRGEPGPPGPAGAAGPAGNPGAD (SEQ ID No. 3) which is a human collagen I-type peptide fragment; the C-terminal amino acid sequence was GAPGPCCGG (SEQ ID No. 2). Namely, the amino acid sequence of the recombinant type I humanized collagen C1L1T is as follows: GPMGPSGPRGLPGPPGAPGPQGFQGPPGEPGEPGASGPMGPRGPPGPPGKNGDDGEAGKPGRPGERGPPGPQGARGLPGTAGLPGMKGHRGFSGLDGAKGDAGPAGPKGEPGSPGENGAPGQMGPRGLPGERGRPGAPGPAGARGNDGATGAAGPPGPTGPAGPPGFPGAVGAKGEAGPQGPRGSEGPQGVRGEPGPPGPAGAAGPAGNPGADGAPGPCCGG (SEQ ID No. 4).
In the present invention, the recombinant type I humanized collagen C1L1T may be prepared by a method conventional in the art. For example, it can be produced by the steps of: (1) constructing escherichia coli genetic engineering bacteria; (2) fermenting and culturing escherichia coli genetic engineering bacteria; (3) induction and expression of proteins; (4) purification and optionally cleavage of the protein.
In the step (1), the construction of the escherichia coli genetically engineered bacterium can be performed by the following steps: a. obtaining a target gene fragment; b. inserting the obtained target gene fragment into a pET-32a expression vector to obtain a recombinant expression plasmid; c. transferring the recombinant expression plasmid into escherichia coli competent cells BL21 (DE 3), and screening to obtain positive escherichia coli genetic engineering bacteria.
In the above steps (2) and (3), the fermentation culture of the E.coli genetically engineered bacterium and the induction and expression of the protein may be performed by the following steps: a. selecting a single colony of the optimized escherichia coli genetic engineering bacteria, placing the single colony in an LB liquid culture medium containing ampicillin antibiotics, culturing at 37 ℃ and 220rpm for 5 hours, and cooling to 16 ℃; b. induction was performed by adding IPTG at a final concentration of 0.25mM, and culturing was performed for 18 hours. The cells were collected by centrifugation at 3000rpm and 4℃for 20 min.
In the above step (4), the purification and cleavage of the protein may be performed by: a. bacteria were resuspended in Tris buffer (25mM Tris,200mM NaCl,pH8.0), homogenized and broken, centrifuged at 17000rpm for 20min at 4℃and the supernatant collected; b. by Ni 6 FF affinity column binding protein, rinsing the hybrid protein with a wash buffer containing 20mM imidazole (20 mM imidazole, 25mM Tris,200mM NaCl,pH 8.0), eluting the protein of interest with a solution containing 250mM imidazole (250 mM imidazole, 25mM Tris,200mM NaCl,pH 8.0); c. adding a proper amount of Prescission Protease (PPase) protease with His tag into the eluted protein sample, and performing enzyme digestion for 2 hours at the temperature of 16 ℃ to obtain the target protein.
In the present invention, the host cell may be a eukaryotic cell, such as fungi and yeasts, a prokaryotic cell, such as a bacterium of the enterobacteriaceae family. It will be appreciated that the person skilled in the art may replace the E.coli strain described above as host cell by another expression strain.
The invention also provides a nucleic acid molecule comprising a nucleic acid sequence encoding the recombinant type I humanized collagen C1L1T of the invention. The nucleic acid may be DNA or cDNA. The nucleic acid molecule may consist essentially of a nucleic acid sequence encoding a protein of the invention, or may consist of only a nucleic acid sequence encoding a protein of the invention. Such nucleic acid molecules can be synthesized using methods known in the art. Because of the degeneracy of the genetic code, it will be understood by those skilled in the art that nucleic acid molecules of different nucleic acid sequences may encode the same amino acid sequence.
The invention also provides a vector comprising the nucleic acid sequence of the invention. Suitable vectors are known in the art of vector construction and include selection of promoters and other regulatory elements, such as enhancer elements. The vectors of the present invention include sequences suitable for introduction into cells. For example, the vector may be an expression vector in which the coding sequence of the protein is under the control of its own cis-acting regulatory element, the vector being designed to facilitate gene integration or gene replacement in a host cell, etc.
As understood by those of ordinary skill in the art, in the present invention, the term "vector" includes DNA molecules, e.g., plasmids, phages, viruses or other vectors, which contain one or more heterologous or recombinant nucleic acid sequences. Suitable phage and viral vectors include, but are not limited to: lambda phage, EMBL phage, simian virus, bovine wart virus, epstein-Barr virus, adenovirus, herpes virus, mouse sarcoma virus, murine breast cancer virus, lentivirus, etc.
The recombinant type I humanized collagen C1L1T of the present invention comprises a sequence represented by SEQ ID No.4 or a sequence in which one or more amino acids are substituted, deleted, inserted and/or added in the sequence represented by SEQ ID No.4, as long as the recombinant type I humanized collagen C1L1T of the present invention retains the cell adhesion effect of the amino acid sequence of SEQ ID No.4. The "plurality" may be 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11.
Amino acid addition refers to the addition of an amino acid at the C-or N-terminus of an amino acid sequence, e.g., SEQ ID No.4, provided that the recombinant type I humanized collagen C1L1T of the present invention retains the cell adhesion effect of the amino acid sequence of SEQ ID No.4.
Amino acid substitution refers to the replacement of a certain amino acid residue at a certain position of an amino acid sequence, e.g., the sequence of SEQ ID No.4, with another amino acid residue, as long as the recombinant type I humanized collagen C1L1T of the present invention retains the cell adhesion effect of the amino acid sequence of SEQ ID No.4.
Amino acid insertion refers to the insertion of amino acid residues at appropriate positions in an amino acid sequence, such as the sequence of SEQ ID No.4, which may also be all or partially adjacent to each other, or none of the inserted amino acids adjacent to each other, as long as the recombinant type I humanized collagen C1L1T of the present invention retains the cell adhesion effect of the amino acid sequence of SEQ ID No.4. The insertion position of an amino acid is not between the repeated sequences in this context.
Amino acid deletion means that 1, 2 or 3 or more amino acids can be deleted from an amino acid sequence, e.g., the sequence of SEQ ID No.4, as long as the recombinant type I humanized collagen C1L1T of the present invention retains the cell adhesion effect of the amino acid sequence of SEQ ID No.4.
In the present invention, a substitution may be a conservative amino acid substitution, meaning that 3, more preferably 2 or 1 amino acids are replaced with amino acids having similar or similar properties to the amino acid sequence of SEQ ID No.4 to form a peptide. These conservatively mutated peptides may be generated by amino acid substitutions according to the table below.
Initial residues | Representative substitution | Preferred substitution |
Ala(A) | Val;Leu;Ile | Val |
Arg(R) | Lys;Gln;Asn | Lys |
Asn(N) | Gln;His;Lys;Arg | Gln |
Asp(D) | Glu | Glu |
Cys(C) | Ser | Ser |
Gln(Q) | Asn | Asn |
Glu(E) | Asp | Asp |
Gly(G) | Pro;Ala | Ala |
His(H) | Asn;Gln;Lys;Arg | Arg |
Ile(I) | Leu;Val;Met;Ala;Phe | Leu |
Leu(L) | Ile;Val;Met;Ala;Phe | Ile |
Lys(K) | Arg;Gln;Asn | Arg |
Met(M) | Leu;Phe;Ile | Leu |
Phe(F) | Leu;Val;Ile;Ala;Tyr | Leu |
Pro(P) | Ala | Ala |
Ser(S) | Thr | Thr |
Thr(T) | Ser | Ser |
Trp(W) | Tyr;Phe | Tyr |
Tyr(Y) | Trp;Phe;Thr;Ser | Phe |
Val(V) | Ile;Leu;Met;Phe;Ala | Leu |
As used herein, the terms "medium stringency conditions", "medium-high stringency conditions", "high stringency conditions" or "very high stringency conditions" describe conditions for nucleic acid hybridization and washing. Guidance for performing hybridization reactions is provided in Current Protocols in Molecular Biology, john Wiley & Sons, n.y. (1989), 6.3.1-6.3.6, incorporated herein by reference. Aqueous and non-aqueous processes are described in this document, and either may be used. For example, specific hybridization conditions are as follows: (1) Low stringency hybridization conditions are washed 2 times in 6 x sodium chloride/sodium citrate (SSC), at about 45 ℃, then at least 50 ℃, in 0.2 x SSC,0.1% sds (for low stringency conditions the wash temperature can be raised to 55 ℃); (2) Medium stringency hybridization conditions are washed 1 or more times in 6 XSSC, at about 45℃followed by 0.2 XSSC, 0.1% SDS at 60 ℃; (3) High stringency hybridization conditions are washed 1 or more times in 6 XSSC, at about 45℃followed by 65℃in 0.2 XSSC, 0.1% SDS and preferably; (4) Very high stringency hybridization conditions are 0.5M sodium phosphate, 7% SDS, washed 1 or more times in 0.2 XSSC, 1% SDS at 65℃followed by 65 ℃.
In practical use, the protein polypeptide of the present invention or a pharmaceutically acceptable salt thereof, a derivative thereof or a pharmaceutically acceptable salt thereof, the above conjugate, the above multimer and the above composition may be administered to a patient as a drug directly or after being mixed with a suitable carrier or excipient. The carrier materials herein include, but are not limited to, water soluble carrier materials (e.g., polyethylene glycol, polyvinylpyrrolidone, organic acids, etc.), poorly soluble carrier materials (e.g., ethylcellulose, cholesterol stearate, etc.), enteric carrier materials (e.g., cellulose acetate phthalate, carboxymethyl ethyl cellulose, etc.). Among them, preferred is a water-soluble carrier material. The materials can be prepared into various dosage forms, including but not limited to tablets, capsules, dripping pills, aerosols, pills, powders, solutions, suspensions, emulsions, granules, liposomes, transdermal agents, buccal tablets, suppositories, freeze-dried powder injection and the like. The suppository can be pessary, vaginal ring, ointment, cream or gel suitable for vaginal application. The protein polypeptide dosage form can be a common preparation, a slow release preparation, a controlled release preparation and various microparticle administration systems. For the purpose of shaping the unit dosage form into a tablet, various carriers known in the art can be widely used. Examples of carriers are, for example, diluents and absorbents such as starch, dextrin, calcium sulfate, lactose, mannitol, sucrose, sodium chloride, glucose, urea, calcium carbonate, kaolin, microcrystalline cellulose, aluminum silicate, etc.; humectants and binders such as water, glycerin, polyethylene glycol, ethanol, propanol, starch slurry, dextrin, syrup, honey, dextrose solution, acacia slurry, gelatin slurry, sodium carboxymethyl cellulose, shellac, methyl cellulose, potassium phosphate, polyvinylpyrrolidone, and the like; disintegrants such as dry starch, alginate, agar powder, brown algae starch, sodium bicarbonate and citric acid, calcium carbonate, polyoxyethylene, sorbitol fatty acid ester, sodium dodecyl sulfonate, methylcellulose, ethylcellulose, etc.; disintegration inhibitors such as sucrose, glyceryl tristearate, cocoa butter, hydrogenated oils and the like; absorption promoters such as quaternary ammonium salts, sodium lauryl sulfate, and the like; lubricants such as talc, silica, corn starch, stearate, boric acid, liquid paraffin, polyethylene glycol, and the like. The tablets may be further formulated into coated tablets, such as sugar coated tablets, film coated tablets, enteric coated tablets, or bilayer and multilayer tablets. For the purpose of formulating the unit dosage form into a pill, various carriers well known in the art can be widely used. Examples of carriers are, for example, diluents and absorbents such as glucose, lactose, starch, cocoa butter, hydrogenated vegetable oils, polyvinylpyrrolidone, gelucire, kaolin, talc, etc.; binders such as acacia, tragacanth, gelatin, ethanol, honey, liquid sugar, rice paste or batter, and the like; disintegrants such as agar powder, dry starch, alginate, sodium dodecyl sulfate, methylcellulose, ethylcellulose, etc. For preparing a unit dosage form into a suppository, various carriers well known in the art can be widely used. Examples of carriers include polyethylene glycol, lecithin, cocoa butter, higher alcohols, esters of higher alcohols, gelatin, semisynthetic glycerides, and the like. For preparing unit dosage forms into injectable preparations such as solutions, emulsions, lyophilized powders and suspensions, all diluents commonly used in the art, for example, water, ethanol, polyethylene glycol, 1, 3-propanediol, ethoxylated isostearyl alcohol, polyoxyisostearyl alcohol, polyoxyethylene sorbitol fatty acid esters, etc. may be used. In addition, in order to prepare an isotonic injection, an appropriate amount of sodium chloride, glucose or glycerin may be added to the preparation for injection, and further, a conventional cosolvent, a buffer, a pH adjuster, and the like may be added. In addition, colorants, preservatives, flavors, flavoring agents, sweeteners, or other materials may also be added to the pharmaceutical formulation, if desired.
The preparation can be administrated by injection, including subcutaneous injection, intravenous injection, intramuscular injection, intraperitoneal injection, intracisternal injection or infusion, etc.; administration via the luminal tract, such as rectally, vaginally, and sublingually; respiratory tract administration, such as via the nasal cavity; mucosal administration. The above route of administration is preferably injection, and the preferred route of injection is subcutaneous injection.
The dosage of the protein polypeptide of the present invention or a pharmaceutically acceptable salt thereof, a derivative thereof or a pharmaceutically acceptable salt thereof, the conjugate, the polymer and the composition will depend on many factors such as the nature and severity of the disease to be prevented or treated, the sex, age, weight and individual response of the patient or animal, the specific active ingredient used, the route of administration and the number of times of administration, etc. The above-mentioned doses may be administered in a single dosage form or divided into several, for example two, three or four dosage forms. For any particular patient, the particular therapeutically effective dose level will depend on a variety of factors including the disorder being treated and the severity of the disorder; the activity of the specific active ingredient employed; the specific composition employed; age, weight, general health, sex and diet of the patient; the time of administration, route of administration and rate of excretion of the particular active ingredient employed; duration of treatment; a medicament for use in combination or simultaneously with the particular active ingredient employed; and similar factors well known in the medical arts. For example, it is common in the art to start doses of the active ingredient below the level required to obtain the desired therapeutic effect and to gradually increase the dose until the desired effect is obtained.
In order to more clearly describe the technical solution of the present invention, the following description is further given by way of specific examples, but not by way of limitation, only some examples of the present invention.
Example 1: preparation of recombinant type I humanized collagen C1L1T
Construction of C1L1T Gene expression vector
The full-length protein sequence of the recombinant type I humanized collagen C1L1T used in the embodiment is shown as SEQ ID No.4, the full length is 222aa, and the full length of the corresponding gene is 666bp. Codon optimization is carried out on the codons of the escherichia coli, and the optimized sequence is as follows: GGGCCCATGGGACCTTCAGGTCCAAGGGGATTGCCGGGTCCTCCGGGTGCTCCGGGTCCGCAGGGTTTTCAGGGTCCGCCAGGCGAGCCGGGCGAGCCGGGCGCTAGCGGTCCGATGGGTCCGCGTGGTCCGCCGGGCCCGCCGGGCAAGAACGGCGACGACGGTGAGGCAGGCAAACCGGGGCGCCCTGGTGAACGTGGTCCACCGGGTCCGCAAGGTGCGAGAGGCCTGCCCGGTACCGCAGGCCTGCCGGGCATGAAAGGTCACCGTGGCTTCAGCGGTCTGGATGGTGCGAAGGGCGACGCAGGTCCGGCGGGTCCAAAAGGCGAGCCGGGTTCCCCGGGCGAAAATGGCGCGCCTGGCCAGATGGGTCCGCGTGGTTTACCGGGCGAGCGCGGCCGTCCGGGCGCGCCGGGCCCAGCGGGTGCCCGTGGAAACGATGGCGCGACGGGTGCGGCTGGCCCACCGGGCCCGACCGGTCCGGCGGGTCCGCCGGGTTTCCCGGGTGCCGTTGGTGCGAAGGGTGAAGCAGGCCCCCAAGGTCCGCGCGGTTCTGAAGGTCCGCAAGGGGTGCGTGGTGAACCGGGCCCGCCGGGCCCGGCTGGCGCTGCAGGTCCGGCGGGCAACCCGGGTGCCGATGGTGCACCGGGTCCGTGTTGTGGTGGT (SEQ ID No. 5).
The Beijing Cheng Yuanke lovely gene biotechnology Co., ltd is entrusted to synthesize gene fragments, and the synthesized gene fragments are inserted between BamHI and XhoI cleavage sites of the pET-32a expression vector to obtain corresponding recombinant expression plasmids. The vector diagram of the recombinant expression plasmid is shown in FIG. 1.
2. Transformation of recombinant expression plasmids
Transferring the recombinant expression plasmid into an escherichia coli competent cell BL21 (DE 3), and screening to obtain the positive escherichia coli genetic engineering bacteria.
The specific process is as follows: (1) taking 1 mu L of the plasmid into 100 mu L of escherichia coli competent cells BL21 (DE 3), and standing on ice for 30min; (2) heating the mixture in a water bath at a temperature of 42 ℃ for 90s, and then rapidly standing on ice for 2min; (3) to this mixture, 700. Mu.L of a non-resistant LB liquid medium (10 g/L peptone, 5g/L yeast extract, 10g/L sodium chloride) was added, and the mixture was cultured at 37℃for 1 hour at 220 rpm; (4) 200. Mu.L of the bacterial liquid was uniformly spread on LB plates containing ampicillin (Amp) (10 g/L peptone, 5g/L yeast extract, 10g/L sodium chloride, 15g/L agar, 100. Mu.g/mL ampicillin); (5) the plates were incubated upside down in a 37℃incubator for about 16 hours to allow for the growth of clearly visible colonies.
3. Inducible expression of a protein of interest
And selecting a single colony of the optimized escherichia coli genetic engineering bacteria from an LB plate, placing the single colony into an LB liquid culture medium containing ampicillin antibiotics, culturing at 37 ℃ and 220rpm for 5 hours, cooling to 16 ℃, adding IPTG with the final concentration of 0.25mM for induction, and culturing for 18 hours. The cells were collected by centrifugation at 3000rpm and 4℃for 20 min.
Purification of C1L1T
Bacteria were resuspended in Tris buffer (25mM Tris,200mM NaCl,pH8.0), lysed, homogenized and broken, centrifuged at 17000rpm for 20min at 4℃and the supernatant was collected; washing the Ni affinity column with clear water, balancing the column with buffer 1 (25mM Tris,200mM NaCl,pH8.0), loading, rinsing the hybrid protein with a solution containing 20mM imidazole (20 mM imidazole, 25mM Tris,200mM NaCl,pH 8.0), eluting the target protein with a solution containing 250mM imidazole (250 mM imidazole, 25mM Tris,200mM NaCl,pH 8.0); washing the column with a solution containing 1M imidazole, washing the column with water, and finally filling the column with 20% ethanol; an appropriate amount of His-tagged Prescission Protease (PPase) protease is added to the eluted protein sample, and the mixture is subjected to enzyme digestion for 2 hours at 16 ℃, and then electrophoresis detection is carried out.
Electrophoresis detection of C1L1T
The purity of the obtained protein C1L1T was checked by SDS-PAGE. The specific process is as follows: 20. Mu.L of purified protein solution was added with 5. Mu.L of 5 Xprotein loading buffer (250 mM Tris-HCl (pH 6.8), 10% SDS,0.5% bromophenol blue, 50% glycerol, 5% beta-mercaptoethanol), and the mixture was placed in boiling water at 100℃for 5 minutes, then 10. Mu.L of each well was added to SDS-PAGE protein gel, and after electrophoresis at a voltage of 150V for 1 hour, protein staining was performed for 3 minutes with Coomassie brilliant blue staining solution (0.1% Coomassie brilliant blue R-250, 25% ethanol, 10% glacial acetic acid), and further protein staining was performed with protein staining solution (10% acetic acid, 5% ethanol).
The detection result is shown in FIG. 2, the apparent molecular weight of the C1L1T obtained by electrophoresis is 33kDa, and the molecular weight corresponds to the protein of the C1L1T, which indicates that the recombinant type I humanized collagen C1L1T is correctly expressed.
Example 2: biological activity detection of recombinant type I humanized collagen C1L1T
Methods for detecting collagen activity can be found in references Juming Yao, satoshi Yanagisawa, tetsuo Asakura, design, expression and Characterization of Collagen-Like Proteins Based on the Cell Adhesive and Crosslinking Sequences Derived from Native Collagens, J biochem.136,643-649 (2004). The specific implementation method is as follows:
(1) The concentration of the protein sample to be detected is detected by an ultraviolet absorption method, and the protein sample to be detected comprises commercial human collagen (Sigma, C7774) and recombinant I-type humanized collagen C1L1T provided by the invention.
Specifically, the ultraviolet absorbance of the samples at 215nm and 225nm, respectively, was measured, and the protein concentration was calculated using the empirical formula C (μg/mL) =144× (a 215-a 225), taking care of detection at a215< 1.5. The principle of the method is as follows: the characteristic absorption of peptide bond under far ultraviolet light is measured, the influence of chromophore content is avoided, the interference substances are few, the operation is simple and convenient, and the method is suitable for detecting the human collagen and analogues thereof which are not developed by coomassie brilliant blue. (reference is Walker JM. The Protein Protocols Handbook, second edition. HumanaPress. 43-45.). After the protein concentration was detected, all the protein concentrations to be tested were adjusted to 0.5mg/mL with PBS.
(2) 100. Mu.L of each protein solution was added to the 96-well plate and allowed to stand at room temperature for 60min in comparison with a blank PBS solution.
(3) 10 is added into each hole 5 3T3 cells with good culture state are incubated for 60min at 37 ℃.
(4) Each well was washed 4 times with PBS.
(5) Detection of OD with LDH detection kit (Roche, 04744926001) 492nm Is a solid phase, and is a liquid phase. The cell attachment rate can be calculated from the values of the blank. The calculation formula is as follows: cell attachment rate= (measurementTest well-blank well) ×100% (positive well-blank well). The cell attachment rate can be used for reflecting the activity of the collagen. The higher the activity of the protein, the better the environment can be provided for the cells in a short time, and the cell attachment is assisted.
As shown in fig. 3, it is understood from the comparison that the recombinant type I humanized collagen C1L1T of the present invention has more excellent bioadhesive activity than the commercial human collagen.
Sequence listing
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Claims (9)
1. The amino acid sequence of the recombinant type I humanized collagen C1L1T is shown as SEQ ID No.4.
2. A polynucleotide encoding the recombinant type I humanized collagen C1L1T of claim 1.
3. An expression vector comprising the polynucleotide of claim 2.
4. A host cell comprising the expression vector of claim 3.
5. The method for producing recombinant type I humanized collagen C1L1T of claim 1, comprising the steps of:
(1) culturing the host cell of claim 4 in a medium and producing the protein;
(2) harvesting and purifying the protein; and
(3) optionally, cleaving the protein.
6. The method according to claim 5, wherein in step (2), the protein is purified by Ni column and/or ion exchange chromatography.
7. The method according to claim 5, wherein in step (3), the protein is cleaved with PPase protease.
8. Use of the recombinant type I humanized collagen C1L1T of claim 1 in the manufacture of a product, wherein the product is a tissue engineering product, cosmetic or pharmaceutical having an effect of promoting cell adhesion.
9. A product comprising the recombinant type I humanized collagen C1L1T of claim 1, wherein the product is a tissue engineering product, a cosmetic or a pharmaceutical.
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