WO2008074230A1 - Interferon alpha mutant and its polyethylene glycol derivative - Google Patents

Interferon alpha mutant and its polyethylene glycol derivative Download PDF

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Publication number
WO2008074230A1
WO2008074230A1 PCT/CN2007/003711 CN2007003711W WO2008074230A1 WO 2008074230 A1 WO2008074230 A1 WO 2008074230A1 CN 2007003711 W CN2007003711 W CN 2007003711W WO 2008074230 A1 WO2008074230 A1 WO 2008074230A1
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ifn
polyethylene glycol
interferon alpha
cys86
peg
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PCT/CN2007/003711
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English (en)
French (fr)
Inventor
Jinyi Liu
Xiaoxia Niu
Minyi Zhou
Yi Yang
Jianbo Sun
Yongqing Cheng
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Beijing Tri-Prime Genetic Engineering Co., Ltd.
Beijing Bio-Tech Development Co., Ltd.
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Application filed by Beijing Tri-Prime Genetic Engineering Co., Ltd., Beijing Bio-Tech Development Co., Ltd. filed Critical Beijing Tri-Prime Genetic Engineering Co., Ltd.
Priority to CN2007800345043A priority Critical patent/CN101547935B/zh
Priority to US12/519,917 priority patent/US8168751B2/en
Priority to KR1020097013006A priority patent/KR101149607B1/ko
Priority to JP2009541739A priority patent/JP5407044B2/ja
Publication of WO2008074230A1 publication Critical patent/WO2008074230A1/zh
Priority to US13/431,226 priority patent/US8901277B2/en

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    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K14/00Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/52Cytokines; Lymphokines; Interferons
    • C07K14/555Interferons [IFN]
    • C07K14/56IFN-alpha
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00Medicinal preparations containing peptides
    • A61K38/16Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/17Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • A61K38/19Cytokines; Lymphokines; Interferons
    • A61K38/21Interferons [IFN]
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/56Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
    • A61K47/59Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyureas or polyurethanes
    • A61K47/60Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyureas or polyurethanes the organic macromolecular compound being a polyoxyalkylene oligomer, polymer or dendrimer, e.g. PEG, PPG, PEO or polyglycerol
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12Antivirals
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00Antineoplastic agents
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00Drugs for immunological or allergic disorders
    • A61P37/02Immunomodulators
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
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    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K17/00Carrier-bound or immobilised peptides; Preparation thereof
    • C07K17/02Peptides being immobilised on, or in, an organic carrier
    • C07K17/08Peptides being immobilised on, or in, an organic carrier the carrier being a synthetic polymer
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    • C12N15/00Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09Recombinant DNA-technology
    • C12N15/11DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00Medicinal preparations containing peptides

Definitions

  • the present invention relates to a method for preparing an interferon alpha mutant and a polyethylene glycol derivative thereof and use thereof.
  • the present invention relates to site-directed mutagenesis of a-interferon using in vitro site-directed mutagenesis, replacing Tyr at position 85 or 86 with Cys, and utilizing this site to covalently bind to polyethylene glycol.
  • the present invention also relates to a method for specifically modifying interferon using cysteine, a purified extraction of interferon alpha mutant polyethylene glycol derivative, and its use in cancer and infectious diseases. Background technique
  • Interferons are an important class of cytokines with broad-spectrum antiviral, anti-cell proliferation and immunomodulatory effects.
  • Mammalian interferons can be divided into ⁇ , ⁇ , ⁇ , ⁇ and so on. Among them, ⁇ interferon can be divided into more than ten subtypes. It has been proved by a large number of clinical studies that ⁇ -type interferon is an important anti-virus. And anti-tumor treatments. At present, the most widely used in China is recombinant human interferon alb, 0123 and 01213.
  • CN 1511849A (Applicant: Beijing Sanyuan Genetic Engineering Co., Ltd.) discloses the use of in vitro homologous recombination to obtain a variety of a-type interferon molecules, which are more active and stable than dry hydrazine. Great advantage.
  • PEGNOLOG Y polyethylene glycol modification technology
  • the technology of modifying polyethylene glycol with polyethylene is a new technology developed in the past decade to improve the pharmacokinetic properties of protein drugs. It binds the activated polyethylene glycol molecule (PEG) to the surface of the protein molecule, thereby affecting the spatial structure of the protein, and ultimately leads to changes in various biochemical properties of the protein, such as: increased chemical stability, The ability to resist protease hydrolysis is increased, immunogenicity and toxicity are reduced or eliminated, body half-life is prolonged, plasma clearance is reduced, and the like.
  • PEG polyethylene glycol molecule
  • the PEG component is an inert long chain amphiphilic molecule formed by polymerizing an oxyethylene monomer.
  • the active functional group of the activated PEG can be linked to a specific part of the therapeutic molecule (such as an amine, sulfhydryl or other nucleophile).
  • the covalent linkage of the PEG derivative utilizes the amino- and lysine molecules of the lysine as the modification site, and each linkage determines a different isotype.
  • the distribution of PEG isoforms is important in drug development. Since the biological activity of the product is closely related to the mixture of specific isoform distributions, the product must be defined by the distribution requirements. The consistency of the PEG isoform distribution during the entire drug development process, including production process changes and scale-out, must be demonstrated. In actual production, this brings great difficulties to the process control and quality evaluation of the product.
  • the fixed point modification can avoid all the above troubles, and the modification at a specific site of the protein can obtain a highly specific modified product, which can effectively control the purity of the modified product and make the process more Simple and product quality is also easier to evaluate, so it is receiving more and more attention.
  • Highly selective modification of proteins can be achieved using intracellular cysteine (Cys) sites.
  • Cys cysteine
  • Interferon a2a, a2b and IFN-con 1 have four cysteines in the molecule, and between 1 and 99 Cys, 29 and 139 Cys are formed. Disulfide bond.
  • MIFN novel interferon
  • IFN-alb is structurally distinct from other interferon of group a.
  • the former has a fifth Cys at the 86th position in addition to the above four Cys to form a normal disulfide bond.
  • the small test found that the site can be used. Site-specific modification of interferon. Therefore, in combination with this feature, the modification of other a-interferons is expected to receive the same effect. Summary of the invention
  • the object of the present invention is to provide an interferon a mutant in which the amino acid at position 85 or 86 of the amino acid sequence is mutated to Cys, and the Cys at position 85 or 86 of the mutant can be combined with polyethylene glycol.
  • Forming a polyethylene glycol derivative which has the advantages of good stability, water solubility, resistance to originality, and high biological activity.
  • the 85th or 86th position of a interferon is usually tyrosine (Tyr), which is located in a relatively conserved segment.
  • Te tyrosine
  • a series of mutants were obtained by mutating Tyr to Cys.
  • polyethylene glycol By reaction with polyethylene glycol, a number of listed polyethylene glycol derivatives were obtained.
  • MIFN Cys86 , IFN-Con l Cys86 , IFN a-2ac ys85 and IFN a-2b Cys85 (amino acid sequence see SEQ ID NO. 1-4), for the four existing interferons MIFN, IFN-Con 1, Site-directed mutagenesis of IFN a-2a and IFN a-2b resulted in the substitution of 86 (MIFN and IFN-Con 1 ) or 85 (IFN a-2a and IFN a-2b ) amino acids for Cys.
  • the target gene was recombined, and the recombinant gene was inserted into the expression vector pET-23b to obtain a recombinant plasmid encoding the recombinant protein.
  • the four recombinants were efficiently and stably expressed in E. coli BL21 (DE3) receptor cells, and the expressed products existed in the form of inclusion bodies, and the expression amount accounted for more than 30% of total bacterial proteins.
  • the purification of MIFN Cys86 and IFN-Con l Cys86 was carried out by hydrophobic chromatography, DEAE anion exchange chromatography and S-100 gel exclusion chromatography in three steps to obtain high purity MIFN CyS 86 and IFN-Con.
  • the mutant described in the present invention is a Tyr mutation at position 85 or 86 of a interferon to Cys, it will be understood by those skilled in the art that since the chain length of alpha interferon is not completely identical, Tyr here is only used for Explain the location of the mutation.
  • a person skilled in the art may perform various modifications to the alpha interferon, for example, mutating certain sites to obtain amino acid sequences of the same or similar function different from the existing alpha interferon, however, by the present invention The corresponding sites are subjected to corresponding mutations and modifications to obtain an improvement in performance, and thus, the ⁇ interferon mutant of the present invention further includes these sequences.
  • the present invention provides various interferon alpha mutant polyethylene glycol derivatives, wherein the polyethylene glycol may be linear or branched, and the interferon mutant is PEG with 5000 to 40,000 daltons.
  • the modification showed that the half-life of the PEGylated protein was extended to varying degrees with the increase of the molecular weight of the PEG.
  • the invention also provides a method for preparing and purifying an interferon alpha mutant polyethylene glycol derivative.
  • the present invention finally provides methods and results for in vitro pharmacokinetics and pharmacoassay of interferon alpha mutant polyethylene glycol derivatives, indicating that it is better in the treatment or prevention of immunomodulatory disorders such as tumor diseases or infectious diseases.
  • Technical parameters DRAWINGS
  • Figure 1 Agarose gel electrophoresis pattern of two rounds of PCR products in "Gene Construction and Amplification of MIFN Cys86 " (Example 1A).
  • Lane 1 is the DNA marker;
  • lane 2 is the product of reaction system 1 in the first round of PCR;
  • lane 3 is the product of reaction system 2 in the first round of PCR;
  • lane 4 is the second round of PCR product;
  • FIG. 2 Agarose gel electrophoresis pattern showing positive clones as a template PCR product in "Construction, Transformation and Identification of MIFN Cys86 Recombinant Plasmid” (Example 2A).
  • Lane 1 is a DNA marker;
  • lanes 2 to 8 are a single colony PCR product, wherein 2, 4, 5, 6, 7, and 8 are positive clones;
  • Figure 3 Nde I / EcoR I double digestion electrophoresis pattern showing four mutant recombinant plasmids (Examples 2A to 2D).
  • Lane 1 is DNA marker
  • Lane 2 is pET-23b plasmid vector
  • Lanes 3 and 7 are recombinant plasmids of MIFN Cys86 before and after Nde I / EcoR I digestion
  • Lanes 4 and 8 are Nde I / EcoR I before and after IFN digestion -Con l Cys86 recombinant plasmid
  • Lanes 5 and 9 are the recombinant plasmids of IFN a-2a Cys85 before and after Nde 1 1 EcoR I digestion
  • Lanes 6 and 10 are Nde I / EcoR I before and after IFN a-2b Cys85 Recombinant plasmid
  • Figure 4 SDS-PAGE map of purified MIFN Cys86 , IFN- Conl Cys86 , IFN a-2a Cys85 and IFN a-2b CyS 85 (Examples 3 A to 3D).
  • Lane 1 is a protein marker;
  • lanes 2, 3, 4, and 5 are purified MIFN Cys86 , IFN-Con l Cys86 , IFN a-2ac ys85, and IFN a-2b Cys85 , respectively ;
  • Figure 5 SDS-PAGE map showing the coupling reaction of MIFN Cys86 , IFN-Con 1 Cys86 , IFN a-2ac ys85 and IFN a-2b Cys85 with PEG-MAL (20KD) (Example 4).
  • Lane 1 is a protein marker
  • Lanes 2, 3, 4, and 5 are products of the coupling reaction of MIFN Cys86 , IFN-Con l Cys86 , IFN a-2ac ys85, and IFN a-2b Cys85 with PEG-MAL (20KD)
  • Figure 6 SDS-PAGE map showing the coupling reaction of MIFN Cys86 , IFN- Conl Cys86 , IFN a-2a Cys85 and IFN a-2b Cys85 with PEG-MAL (40KD) (Example 4).
  • Lane 1 is a protein marker
  • Lanes 2, 3, 4, and 5 are products of a coupling reaction of MIFN Cys86 , IFN-Con l Cys86 , IFN a-2ac yS 85, and IFN a-2b Cys85 with PEG-MAL (40KD);
  • Figure 7 SDS-PAGE map of PEG-MAL (20KD) derivatives representing purified 4 interferon a mutants (Example 5).
  • Lane 1 is protein marker; 2, 3, 4, 5 lanes are mPEG (20KD)-MIFN Cys86 , mPEG ( 20KD )-IFN-Con l Cys86 , mPEG ( 20KD )-IFN a-2a Cys85 and mPEG ( 20KD ) -IFN a-2b Cys85 ;
  • Figure 8 SDS-PAGE map of PEG-MAL (40KD) derivatives representing purified 4 interferon alpha mutants (Example 5).
  • Lane 1 is protein marker; 2, 3, 4, 5 lanes are mPEG (40KD)-MIFN Cys86 , mPEG (40KD)-IFN-Con l Cys86 , mPEG (40KD)-IFN a-2a Cys85 and mPEG (40KD) -IFN a-2b Cys85 .
  • Lane 1 is protein marker; 2, 3, 4, 5 lanes are mPEG (40KD)-MIFN Cys86 , mPEG (40KD)-IFN-Con l Cys86 , mPEG (40KD)-IFN a-2a Cys85 and mPEG (40KD) -IFN a-2b Cys85 .
  • the analogs of the four proteins of the present invention MIFN, IFN-Con 1, IFN a-2a and IFN a-2b can be obtained by substitution, addition or deletion of an amino acid functionally equivalent molecule, as is well known in the art. Substitution of one or more amino acid residues to the corresponding amino acid residue within the original sequence alters the original protein sequence, resulting in a silent change.
  • the polyethylene glycol moiety of the polyethylene glycol derivative of the present invention may have a linear or branched structure.
  • thiol-reactive PEGylation reagent capable of reacting with a thiol group of a cysteine residue, including imide-PEG, vinylsulfone-PEG, iodoacetamide-PEG, and n-pyridyl disulfide- PEG or the like, of which maleimide-PEG is preferred.
  • the present invention attempts to modify four alpha interferon mutants with PEG having molecular weights of about 5,000, 10,000, 12,000, 20,000, 30,000, and 40,000 daltons to obtain PEG-interferon derivatives.
  • the data show that the half-life of PEGylated protein is extended to varying degrees with the increase of PEG molecular weight.
  • 20,000 and 40,000 Daltons of PEG are used as low and high molecular weight representatives to specifically describe the preparation and purification methods, pharmacodynamics and pharmacokinetic tests of PEG-interferon derivatives.
  • the PEGylation reagent is mPEG-MAL provided by Nektar Therapeutics and Beijing Key Kai Technology Limited Formula [also written as PEG-MAL (20KD)] or mPEG 2 -MAL [also written as PEG-MAL (40KD) ]], mPEG-MAL and mPEGrMAL are sometimes also abbreviated as PEG-MAL or PEG in general.
  • the engineering bacteria of four kinds of interferon of MIFN, IFN-Con 1, IFN a-2a and IFN a-2b are provided by Beijing Sanyuan Genetic Engineering Co., Ltd.
  • the corresponding engineering bacteria names are BL21 (DE3) I pET23b-MIFN, BL21 (DE3) / pET23b-IFN-Con 1, BL21 (DE3) / pET23b-IFN a-2a, BL21 (DE3) / pET23b-IFN a- 2b.
  • Example 1A Gene Construction and Amplification of MIFN Cys86
  • PCR-SDM PCR in vitro site-directed mutagenesis
  • site-directed mutagenesis was performed by means of overlap extension.
  • the site-directed mutagenesis technique is relatively mature and the procedure is relatively fixed.
  • the length of the primer can be adjusted according to the specific test and the reaction conditions of the PCR, and various combinations can be made in the actual preparation, and the purpose of the site-directed mutagenesis can be achieved, and are covered by the protection range of the present invention.
  • This embodiment is listed as a preferred embodiment (for the same reason, the preferred embodiments are also listed in Examples 1B - 1D).
  • the upstream primer P1 is T7 promoter primer (taatacgactcactataggg)
  • the ⁇ 3 sequence is ggaaaattctgcaccgaactgt
  • downstream ⁇ Primer P2 is T7 terminator primer (gctagttattgctcagcgg)
  • P4 sequence ⁇ 1 J is acagtcggtgcagaatttttcc.
  • the mutation site is contained in P3 and P4.
  • the plasmid for extracting MIFN is used as a template.
  • the first round of PCR includes two reaction systems: the primers of the reaction system 1 are Pl, P4, the amplification mutation site and the DNA sequence upstream thereof; the primers of the reaction system 2 are P2, P3, and the amplification mutation position Point and its downstream DNA sequence.
  • the reaction conditions were 94 ° C for 4 min, 94 ° C lmin, then 55 ° C for 2 min, and 72 ° C for 2 min for a total of 30 cycles.
  • the second round of PCR was overlap extension PCR, and the products of the first round of PCR were used as templates, and Pl and P2 were used as primers for PCR amplification.
  • Figure 1 shows the agarose electrophoresis pattern of two rounds of PCR products.
  • the second round of PCR products were analyzed by agarose gel electrophoresis.
  • a DNA fragment of about 720 bp was selected and digested with Nde I / EcoR I.
  • the target DNA fragment of about 500 bp was recovered by electrophoresis.
  • the upstream primer P1 was T7 promoter primer (taatacgactcactataggg)
  • the ⁇ 3 sequence was gtagatattctgcaccgaactgt
  • the downstream primer P2 was T7 terminator primer (gctagttattgctcagcgg)
  • the P4 sequence ⁇ 1 J was acagtcggtgcagaatttatcc.
  • the mutation site is contained in P3 and P4.
  • the PCR reaction procedure was the same as in Example 1A except that the first round PCR reaction template in this example was a plasmid of IFN-Con 1.
  • the second round of PCR products were analyzed by agarose gel electrophoresis. A DNA fragment of about 720 bp was selected and digested with Nde I / EcoR I. The target DNA fragment of about 500 bp was recovered by electrophoresis.
  • the primer design was the same as in Example 1B, and the PCR reaction procedure was the same as in Example 1A except that the first round PCR' reaction template in this example was a plasmid of IFN a-2a.
  • the second round of PCR product was analyzed by agarose gel electrophoresis. A DNA fragment of about 720 bp was selected and digested with Nde I / EcoR I to recover about 500 bp of the desired DNA fragment for electrophoresis.
  • the primer design was the same as that of Example 1B, and the PCR reaction procedure was the same as that of Example 1A except that the first round PCR reaction template in this example was a plasmid of IFN a-2b.
  • the second round of PCR product was analyzed by agarose gel electrophoresis. A DNA fragment of about 720 bp was selected and digested with Nde I / EcoR I to recover about 500 bp of the desired DNA fragment for electrophoresis.
  • the endonuclease can often have a plurality of choices, and the conditions of the ligation reaction can also be changed, and the construction of the recombinant plasmid can be completed; in this embodiment, the host cell selects the JM109 commonly used in the laboratory. And DH5a does not exclude conversion with other hosts. Based on the principles of science, convenience and speed, the construction, transformation and identification schemes of the recombinant plasmids listed in this example are preferred (the same reason, the examples listed in Examples 2B to 2D are also preferred).
  • the pET-23b plasmid vector was double digested with Nde I / EcoR I, recovered by agarose electrophoresis and ligated with the DNA fragment of interest finally recovered in Example 1A.
  • the ligation reaction conditions were: 2x Rapid buffer 4 ⁇ 5 ⁇ 1, ⁇ 4 DNA Ligase 1 ⁇ 1, target fragment 1 ⁇ 2 ⁇ 1, vector 3 ⁇ 1, and overnight at 4 °C.
  • JM109 or DH5a competent cells were prepared, the above ligation products were transformed, and ampicillin plates were coated and cultured overnight at 37 °C.
  • the single colony was picked as a template, and the primers P1 and P2 designed in Example 1A of the present invention were used for PCR amplification, and the amplified product was subjected to agarose electrophoresis (electrophoresis pattern is shown in Fig. 2), and the positive clone should appear at about 720 bp. Specific band.
  • the positive clones were cultured in small amounts, and the extracted plasmids were digested with Nde I / EcoR I, and specific bands appeared at about 3 kb and 500 bp respectively (the agarose electrophoresis pattern is shown in Figure 3), which is consistent with the expected situation.
  • the recombinant plasmid was successfully constructed.
  • the gene fragment ligated in this example was the target gene fragment recovered in Example 1B.
  • the techniques and methods used in the ligation, transformation and identification operations are identical to those of Example 2A.
  • the Nde I / EcoR I digestion and identification electrophoresis map is shown in Figure 3.
  • a fully automated sequence was also performed by the ABI377 sequencer using the T7 universal primer, and the results showed that the obtained sequence was consistent with the target sequence.
  • the gene fragment ligated in this example was the target gene fragment recovered in Example 1C.
  • the techniques and methods used in the ligation, transformation and identification schemes are identical to those of Example 2A.
  • the Nde I / EcoR I digestion and identification electrophoresis map is shown in Figure 3.
  • a fully automated sequence was also performed by the ABI377 sequencer using the T7 universal primer, and the results showed that the obtained sequence was consistent with the target sequence.
  • the gene fragment ligated in this example was the target gene fragment recovered in Example 1D.
  • the techniques and methods used in the ligation, transformation and identification operations are identical to those of Example 2A.
  • the electropherogram of Nde I / EcoR I digestion identification is shown in Figure 3.
  • a fully automated sequence was also performed by the ABI377 sequencer using the T7 universal primer, and the results showed that the obtained sequence was consistent with the target sequence.
  • Example 3A Expression and Purification of MIFN Cys86
  • the recombinant plasmid obtained in Example 2A was transformed into E. coli BL21 (DE3) or other suitable host to induce expression.
  • the MIFN Cys86 expressed by Escherichia coli BL21 (DE3) is about 30-50% of the total bacterial protein, mainly in the form of inclusion bodies.
  • Example 2B The recombinant plasmid obtained in Example 2B was transformed into E. coli BL21 (DE3) or other suitable host to induce expression.
  • IFN-Con l CyS 86 expressed by Escherichia coli BL21 (DE3) accounted for about 30-50% of total bacterial proteins, mainly in the form of inclusion bodies.
  • Example 2C The recombinant plasmid obtained in Example 2C was transformed into E. coli BL21 (DE3) or other suitable host to induce expression.
  • IFN a-2ac ys85 expressed by Escherichia coli BL21 (DE3) accounted for about 30-50% of total bacterial proteins, mainly in the form of inclusion bodies.
  • IFN a-2a monoclonal antibody column elute with 0.3 mol of IL Gly solution (pH 2.5) containing 100 mmol of IL NaCl, and collect the elution peak; then load the previous eluted sample to Sephacryl S-100.
  • the column was eluted with PBS (pH 7.0).
  • the resulting IFN a-2a Cys85 was more than 95% pure (SDS-PAGE pattern is shown in Figure 4).
  • the recombinant plasmid obtained in Example 2D was transformed into E. coli BL21 (DE3) or other suitable host to induce expression.
  • IFN a-2b CyS 85 expressed by Escherichia coli BL21 (DE3) is about 30-50% of the total bacterial protein, mainly in the form of inclusion bodies.
  • the four interferon a mutants of the invention can be coupled to PEG of various molecular weights.
  • PEG has two mPEG-MAL and mPEG 2 -MAL, with an average molecular weight of about 20 KD and 40 KD, respectively.
  • the above four interferon alpha mutants can be separately concentrated using a DEAE Sepharose FF column.
  • the specific method is as follows: Samples of one of the purified samples of Examples 3A - 3D are diluted 2 times or more with 10 ⁇ 80 mmol IL Tris-HCl pH 7.5 ⁇ 8.5 solution, and loaded onto a DEAE column, then 20 mmol / L PB buffer (pH 7.6 ) + 300 mmol / L NaCl eluted to obtain a concentrate of the desired protein.
  • MIFN Cys86 , IFN-Con l Cys86 , IFN a-2ac ys85 and IFN a-2b Cys85 and mPEG (20KD)-MAL coupling reaction the single PEG derivatives are written as: mPEG (20KD)-MIFN CyS 86 , mPEG (20KD)-IFN-Con l Cys86 , mPEG ( 20KD )-IFN a-2ac ys85 and mPEG ( 20KD )-IFN a-2b Cys85 .
  • MIFN Cys86 , IFN-Con l Cys86 , IFN a-2ac ys85 and IFN a-2b Cys85 are coupled with mPEG(40 D)-MAL.
  • the monoPEG derivatives are written as: mPEG(40KD)-MIFN Cys8 6 , mPEG (40KD)-IFN-Con l Cys86 , mPEG (40KD)-IFN a-2a Cys85 and mPEG (40KD)-IFN a-2b Cys85 .
  • step 1 of this example adjust the protein concentration to 8 ⁇ 12mg / ml, add PEG powder with a molar ratio of 1:1, gently shake the powder to dissolve and react at 4 ° C overnight, that is, the reaction The time should exceed 10 hours.
  • the degree of coupling of the reaction was determined by SDS-PAGE ( Figure 5-6).
  • the purified product was purified by DEAE Sepharose Fast Flow ion exchange chromatography.
  • the specific conditions were as follows: ⁇ The reaction solution was diluted 20 to 30 times with 25 mmol of pH 8.0 Tris buffer system, and then loaded at a flow rate of 3 to 4 ml/min. The equilibrated DEAE column was eluted with a 25 mM pH 8.0 Tris eluate containing NaCl at 80 mM to obtain an elution peak of the desired protein. The final recombinant protein is more than 95% pure. (The SDS-PAGE map is shown in Figure 7-8).
  • Example 6 Determination of in vitro antiviral activity of four interferon alpha, mutant and mutant polyethylene glycol derivatives by WISH-VSV system
  • the in vitro antiviral activity of interferon is determined by the WISH-VSV system by the cytopathic inhibition method. It is a well-known method in the art, and the specific reference is made to the 2005 edition of the Pharmacopoeia of the People's Republic of China, the three appendix XC "Determination of the biological activity of interferon". .
  • This example measures the in vitro antiviral activity of 16 interferons (or derivatives), specifically including:
  • interferon alpha care, IFN-Con l, IFN a-2a and IFN a-2b;
  • polyethylene glycol derivatives There are also 8 kinds of polyethylene glycol derivatives: mPEG(20KD)-MIFN Cys86 , mPEG( 20KD )-IFN-Con l Cys86 , mPEG( 20KD )-IFN a-2a Cys85 , mPEG( 20KD )-IFN a-2b Cys85 , mPEG(40KD)-MIFN Cys86 , mPEG(40KD)-IFN-Con l Cys86 , mPEG(40KD)-IFN a-2ac ys85 and mPEG(40KD)-IFN a-2b Cys85 (prepared in Example 5 of the present invention) .
  • MIFN Cys86 In vitro antiviral activity of MIFN. MIFN Cys86 , mPEG (20KD)-MIFN CyS 86 and mPEG (40KD)-MIFN Cys8 6
  • the 3P87 software fitting showed that the metabolism of MIFN Cys86 and its PEG derivatives in SD rats was consistent with the one-compartment model of primary absorption.
  • a sequence listing of amino acids and nucleotides is provided, wherein the nucleotide sequences of IFN-Con1, IFNa-2a and IFNa-2b are well-known sequences, and in the specific embodiment of the present invention, only the corresponding site cryptosystem The child is mutated to tgc, and thus the DNA sequence of IFN-Con l Cys86 , IFN a-2ac ys85 and IFN a-2b Cys85 is not attached to the present invention.
  • SEQ ID NO: 1 is the amino acid sequence of MIFN Cys86 ;
  • SEQ ID NO: 2 is the amino acid sequence of IFN-Con l Cys86 ;
  • SEQ ID NO: 3 is the amino acid sequence of IFN a-2ac ys85 ;
  • SEQ ID NO: 4 is the amino acid sequence of IFN a-2b Cys85 ;
  • SEQ ID NO: 5 is the DNA sequence of MIFN Cys86 ;
  • SEQ ID NOS: 6-9 are the nucleotide sequences of primers P1 to P4, respectively.

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Description

干扰素 α突变体及其聚乙二醇衍生物 技术领域
本发明涉及干扰素 α 突变体及其聚乙二醇衍生物的制备方法及 用途。 具体地说, 本发明涉及利用体外定点突变技术对 a干扰素进行 定点突变, 将其 85或 86位的 Tyr替换为 Cys, 并利用该位点与聚乙 二醇共价结合。本发明还涉及利用半胱氨酸对干扰素特异性修饰的方 法、干扰素 α突变体聚乙二醇衍生物纯化提取及其在癌症和感染性疾 病中的应用。 背景技术
干扰素是一类重要的家族性细胞因子, 具有广谱的抗病毒、 抗细 胞增殖和免疫调节作用。 哺乳动物的干扰素可以分为 α、 β、 γ、 ω等 几型, 其中 α干扰素又可分十余种亚型, 经大量临床研究证明, α型 亍扰素是一种重要的抗病毒和抗肿瘤治疗药物。 目前我国在临床使用 ,最广泛的主要是重组人干扰素 alb、 0123和01213。
另外, 研究显示, 人 a干扰素的 I型家族有 20多个基因成员, 其中大部分编码功能蛋白, 彼此在核苷酸水平上有大约 90%的同源 性。通过基因工程的手段可以产生相当数量的干扰素的衍生物或类似 物。 目前最引人注目的是美国 Amgen公司根据 13种 a型干扰素的基 因序列同源性, 设计出的一种全新的蛋白质工程药物干复津 (INFERGEN®, IFN-Con 1), 并经美国 FDA批准 1997年在美国上市, 用于治疗丙型肝炎, 其抗病毒活性是 a2b干扰素的 5-10倍。 公开号 为 CN 1511849A的中国专利申请(申请人: 北京三元基因工程公司) 公开了用体外同源重组方法得到多种 a族干扰素分子,其在活性和稳 定性方面比干复津有更大优势。
但是, 无论是干扰素 alb、 a2a、 a2b还是干复津, 作为蛋白质性 药物, 由于稳定性差, 血浆清除率高, 体内半衰期短, 易产生抗原抗 体反应等, 在临床治疗中受到很大的限制。基因工程技术使大规模合 成人重组蛋白成为可能,很大程度上解决了异源蛋白引起的免疫原性 问题, 却仍然无法克服血浆清除快和生物利用度低等缺点, 这些缺点 造成的结果是: 需频繁注射干扰素才能达到有效的血浆治疗浓度; 而 且, 每次注射后均会导致血药浓度的较大波动,形成药物浓度的峰值 与谷值。 这样就可能增加了治疗费用以及给药不便和不良反应的风 险。 因此, 人们试图釆用各种药物传递技术 ( Drug Delivery Technology ), 来提高蛋白质药物的疗效。 而目前在药物传递技术中 研究最为广泛的是聚乙二醇修饰技术 (PEGNOLOG Y)。
聚乙二醇修饰蛋白质的技术是近十几年来发展起来的一种用于 改进蛋白质类药物体内药动学性质的新技术。它是将活化的聚乙二醇 分子 [Polyethylene glycol), PEG]键合到蛋白质分子表面上, 从而影 响蛋白质的空间结构,最终导致蛋白质各种生物化学性质的改变,如: 化学稳定性增加, 抵抗蛋白酶水解的能力提高, 免疫原性和毒性降低 或消失, 体内半衰期延长, 血浆清除率降低等等。
PEG组分是由氧乙烯单体聚合而成的惰性长链的两性分子。 现在 已有多种不同的 PEG分子可供利用。 被活化的 PEG其活性功能基团 可以被联结到治疗分子的某特殊部位(比如胺、 巯基或其他亲核物 质)。 在大多数情况下, PEG衍生物的共价键联结的是利用赖氨酸的 氨基和多肽分子的 N-末端作为修饰部位, 每一个连接部位决定一种 不同的同种型 (isotype )。 在药物研发过程中, PEG同种型的分布具 有重要意义。由于产品的生物学活性与特定同种型分布的混合物有密 切关系, 产品必须按分布要求来定义。 必须证明在整个药物开发过程 中, 包括生产过程改变和按比例放样时 PEG同种型分布的一致性。 在实际生产中, 这给产品的工艺控制和质量评价带来很大困难。
定点修饰则可以避免以上种种麻烦, 在蛋白质特定位点进行修饰 可获得高特异性修饰产物, 可以有效控制修饰产物的纯度, 使工艺更 简单并且产品质量也更易评价, 因此受到越来越多的重视。利用分子 内的半胱氨酸(Cys )位点可以对蛋白质进行高选择性修饰。 带有游 离巯基的蛋白质为数不多, 但却是维持蛋白空间结构的重要共价键, 在此位点的化学修饰常会导致分子结构的较大破坏, 使蛋白活性丧 失。 采用基因工程的手段可以实现这一目的。 值得注意的是, 不同的 蛋白质或多肽结构和性质不同,究竟能不能引进及在什麽位点引进存 在差异。 通过基因工程途径人为增加的 Cys, 会因形成分子内错配或 分子间结合, 导致分子不稳定或形成非正常聚合体。 在这方面, 全面 的序列分析和准确的分子结构模拟将会提供思路。
序列分析发现: 包括干扰素 a2a、 a2b和 IFN-con 1在内的绝大多 数 a干扰素分子内都有四个半胱氨酸,其中 1和 99位 Cys、 29和 139 位 Cys之间形成二硫键。本申请人通过体外同源重组获得的新型干扰 素 (MIFN )也保持了这一特点。 IFN-alb在结构上和 a族其他干扰 素有明显不同, 前者除了具有上述 4个 Cys形成正常二硫键之外,在 第 86位有第 5个 Cys, 小试发现, 利用该位点可以对干扰素进行定 点修饰。 因而, 结合该特点, 对其它 a干扰素进行改造有望收到同样 的效果。 发明内容
本发明的目的在于提供一种干扰素 a突变体, 其氨基酸序列第 85位或第 86位的氨基酸突变为 Cys, 这种突变体的第 85位或 86位 的 Cys可以与聚乙二醇结合,形成聚乙二醇衍生物,其具有良好的稳 定性、 水溶性、 抵抗原性以及高生物活性等优点。
a干扰素的第 85位或 86位通常为酪氨酸(Tyr ), 其位于一个相 对保守的区段, 本发明通过将 Tyr突变为 Cys对. a干扰素进行改造, 获得了一系列突变体, 通过与聚乙二醇反应, 获得了一些列聚乙二醇 衍生物。
下面就目前常用的四种 a干扰素对本发明的技术方案作进一步 的说明:
MIFNCys86、 IFN-Con lCys86、 IFN a-2acys85及 IFN a-2bCys85 (氨基 酸序列见附录 SEQ ID NO.1-4 ), 系对四种现有的干扰素 MIFN、 IFN-Con 1、 IFN a-2a及 IFN a-2b进行定点突变, 将 86 ( MIFN和 IFN-Con 1 )或 85 ( IFN a-2a和 IFN a-2b )位氨基酸替换为 Cys而得。 利用体外定点突变的技术, 分别对目的基因进行重组, 将获得重组基 因插入表达载体 pET-23b中, 获得了可编码重组蛋白的重组质粒。 四 种重组子分别在大肠杆菌 BL21 ( DE3 )受体细胞中高效稳定的表达, 表达产物以包涵体形式存在, 表达量占菌体总蛋白的 30%以上。 MIFNCys86及 IFN-Con lCys86的纯化依次釆用了疏水层析、 DEAE阴离 子交换层析和 S-100凝胶排阻层析三步纯化工艺, 可以得到高纯度的 MIFNCyS86及 IFN-Con lCys86; IFN a-2acys85及 IFN a-2bCys85的纯化依次 釆用了 DEAE阴离子交换层析、单抗亲和层析和 S-100凝胶排阻层析 三步纯化工艺, 可以得到高纯度的 IFN a-2aCys85及 IFN a-2bCys85
尽管本发明描述的突变体是 a干扰素第 85或 86位的 Tyr突变为 Cys, 但是本领域技术人员应当理解, 由于 α干扰素的链长不完全一 致, 因而, 这里的 Tyr仅仅是用于说明突变的位置。 本领域技术人员 可能会对 α干扰素进行各种改造,例如将某些位点进行突变, 进而获 得功能相同或相近的不同于现有 α干扰素的氨基酸序列, 然而, 通过 将本发明所述的相应位点进行相应的突变和修饰,从而获得性能的改 善, 因而, 本发明所述的 α干扰素突变体还包括这些序列。
本发明提供多种干扰素 α突变体聚乙二醇衍生物, 其中聚乙二 醇可以是直链的也可以是具有分支结构的, 用 5000〜40000道尔顿的 PEG对 α干扰素突变体进行修饰, 结果显示 PEG化蛋白的半衰期随 着 PEG分子量的增大有不同程度延长。
本发明还提供了干扰素 α突变体聚乙二醇衍生物的制备和纯化 方法。 本发明最后提供了干扰素 α突变体聚乙二醇衍生物体外药效和 药代试验的方法和结果,表明其在治疗或预防免疫调节紊乱如肿瘤疾 病或传染病方面的应用中有更好的技术参数。 附图说明
图 1 :表示" MIFNCys86的基因构建和扩增"中两轮 PCR产物的琼脂 糖电泳图谱(实施例 1A )。 1泳道为 DNA marker; 2泳道为首轮 PCR 中反应体系 1的产物; 3泳道为首轮 PCR中反应体系 2的产物; 4泳 道为第二轮 PCR产物;
图 2: 表示" MIFNCys86重组质粒的构建、 转化和鉴定"中阳性克隆 作为模板 PCR产物的琼脂糖电泳图谱(实施例 2A )。 1泳道为 DNA marker; 2 ~ 8泳道分别为一个单菌落的 PCR产物, 其中 2、 4、 5、 6、 7、 8为阳性克隆;
图 3: 表示四种突变体重组质粒的 Nde I / EcoR I 双酶切电泳 图谱(实施例 2A ~ 2D )。 1 泳道为 DNA marker; 2泳道为 pET-23b 质粒载体; 3、 7泳道分别为 Nde I / EcoR I酶切前后 MIFNCys86的重 组质粒; 4、 8泳道分别为 Nde I / EcoR I酶切前后 IFN-Con lCys86的 重组质粒; 5、 9泳道分别为 Nde 1 1 EcoR I酶切前后 IFN a-2aCys85 的重组质粒; 6、 10泳道分别为 Nde I / EcoR I酶切前后 IFN a-2bCys85 的重组质粒;
图 4:表示纯化的 MIFNCys86、 IFN-Con lCys86、 IFN a-2aCys85及 IFN a-2bCyS85的 SDS-PAGE图谱(实施例 3 A ~ 3D )。 1泳道为蛋白 marker; 2、 3、 4、 5泳道分别为纯化的 MIFNCys86、 IFN-Con lCys86、 IFN a-2acys85 及 IFN a-2bCys85;
图 5:表示 MIFNCys86、 IFN-Con 1 Cys86、 IFN a-2acys85及 IFN a-2bCys85 与 PEG-MAL ( 20KD )偶联反应的 SDS-PAGE图谱(实施例 4 )。 1 泳道为蛋白 marker; 2、3、4、5泳道分别为 MIFNCys86、IFN-Con lCys86、 IFN a-2acys85及 IFN a-2bCys85与 PEG-MAL ( 20KD )偶联反应的产物; 图 6:表示 MIFNCys86、 IFN-Con lCys86、 IFN a-2aCys85及 IFN a-2bCys85 与 PEG-MAL ( 40KD )偶联反应的 SDS-PAGE图谱(实施例 4 )。 1 泳道为蛋白 marker; 2、3、4、5泳道分别为 MIFNCys86、 IFN-Con lCys86、 IFN a-2acyS85及 IFN a-2bCys85与 PEG-MAL ( 40KD )偶联反应的产物; 图 7: 表示纯化的 4种干扰素 a突变体的 PEG-MAL ( 20KD )衍 生物的 SDS-PAGE图谱(实施例 5 )。 1泳道为蛋白 marker; 2、 3、 4、 5分别泳道为 mPEG(20KD)-MIFNCys86、 mPEG(20KD)-IFN-Con lCys86、 mPEG(20KD)-IFN a-2aCys85及 mPEG(20KD)-IFN a-2bCys85;
图 8: 表示纯化的 4种干扰素 α突变体的 PEG-MAL ( 40KD )衍 生物的 SDS-PAGE图谱(实施例 5 )。 1泳道为蛋白 marker; 2、 3、 4、 5分别泳道为 mPEG(40KD)-MIFNCys86、 mPEG(40KD)-IFN-Con lCys86、 mPEG(40KD)-IFN a-2aCys85及 mPEG(40KD)-IFN a-2bCys85。 具体实施方式
下面结合具体的实施例来进一步阐述本发明。 应当理解, 这些实 施例仅用于说明本发明, 而不能限制本发明的保护范围。
除非特殊定义, 本文描述所用的术语是在有关技术领域中公知 的术语。 标准的化学符号及缩写符号可以与其全名互换使用。 例如: "PEG"和"聚乙二醇" 具有相同的含义; "干扰素 a"、 "IFN-a"及" a干 扰素"含义也相同。
除非特殊指明, 本文所用到但未明确阐述或简单阐述的技术和 方法是指本技术领域通常使用的技术和方法,可以一般的按照本领域 公知的技术和方法进行。试剂盒的使用是根据制造商或供应商提供的 说明书进行。
本发明 MIFN、 IFN-Con 1、 IFN a-2a及 IFN a-2b四种蛋白的类 似物可以通过氨基酸功能等效分子的取代、 添加或缺失来获得, 如在 本技术领域公知,用性质类似的一个或多个氨基酸残基取代原序列内 相应的氨基酸残基改变原蛋白质序列, 形成沉默改变。 本发明中聚乙二醇衍生物的聚乙二醇部分, 如本领域技术人员 公知, 可以具有直链或分支结构。 其是一种巯基反应 PEG化试剂, 能够和半胱氨酸残基的巯基发生反应, 包括来酰亚胺 -PEG、 乙烯砜 -PEG, 碘代乙酰胺 -PEG及正吡啶基二硫化物 -PEG 等, 其中优选马 来酰亚胺 -PEG。本发明尝试用分子量约 5000、 10000、 12000、 20000、 30000和 40000道尔顿的 PEG对四种 α干扰素突变体进行修饰,均可 以获得 PEG-干扰素的衍生物。 资料显示: PEG化蛋白的半衰期随着 PEG 分子量的增大有不同程度延长。 本发明实施例中用 20000 和 40000道尔顿的 PEG作为低、 高分子量的代表具体阐述 PEG-干扰素 衍生物的制作纯化方法及药效、 药代试验。
在优选的实施例中, PEG化试剂是 Nektar Therapeutics及北京键 凯科技有限公式提供的 mPEG-MAL [也写做 PEG-MAL ( 20KD ) ]或 mPEG2-MAL [也写做 PEG-MAL ( 40KD ) ], 文中 mPEG-MAL 和 mPEGrMAL有时也一般性的简写为 PEG-MAL或 PEG。
本发明中 MIFN、 IFN-Con 1、 IFN a-2a及 IFN a-2b四种 a干扰 素的工程菌由北京三元基因工程有限公司提供。相应的工程菌名称分 别为 BL21 ( DE3 ) I pET23b-MIFN、 BL21 ( DE3 ) / pET23b- IFN-Con 1、 BL21 ( DE3 ) / pET23b-IFN a-2a、 BL21 ( DE3 ) / pET23b-IFN a-2b。 实施例 1A MIFNCys86的基因构建和扩增
釆用 PCR体外定点突变技术 (PCR-SDM),以重叠延伸的手段进行 定点突变。定点突变技术已经比较成熟, 程序比较固定。 可以根据具 体试验调整的是引物的位置长度和 PCR的反应条件, 在实际搡作中 可以有多种组合,都可以达到定点突变的目的, 均涵盖在本发明的保 护范围之内。 本实施例所列为优选方案 (同样原因, 实施例 1B - 1D 所列也为优选方案)。
设 计 两 对 引 物 , 上 游 引 物 P1 为 T7 promoter primer(taatacgactcactataggg) , Ρ3序列为 ggaaaaattctgcaccgaactgt; 下游 ■引物 P2 为 T7 terminator primer(gctagttattgctcagcgg) , P4 序歹1 J为 acagttcggtgcagaatttttcc。 突变位点包含在 P3和 P4之中。
提取 MIFN的质粒作为模板, 首轮 PCR包括两个反应体系: 反 应体系 1引物为 Pl、 P4, 扩增突变位点及其上游的 DNA序列; 反应 体系 2引物为 P2、 P3, 扩增突变位点及其下游的 DNA序列。 反应条 件为 94°C 4min、 94 °C lmin, 然后 55°C 2min、 72°C 2min共 30个循 环。 第二轮 PCR为重叠延伸 PCR, 以首轮 PCR的产物为模板, 以 Pl、 P2为引物进行 PCR扩增。 反应条件为 94°C 4min、 94 °C lmin, 然后 56°C 2min、 72°C 2min共 30个循环。 图 1表示两轮 PCR产物的 琼脂糖电泳图谱。
第二轮 PCR产物经琼脂糖电泳分析, 选择 720bp左右的 DNA 片段, 用 Nde I / EcoR I双酶切, 电泳回收 500bp左右的目的 DNA 片段备用。
实施例 IB IFN-Con lCys86的基因构建和扩增
设 计 两 对 引 物 , 上 游 引 物 P1 为 T7 promoter primer(taatacgactcactataggg) , Ρ3序列为 ggataaattctgcaccgaactgt; 下游 引物 P2 为 T7 terminator primer(gctagttattgctcagcgg) , P4 序歹1 J为 acagttcggtgcagaatttatcc。 突变位点包含在 P3和 P4之中。
PCR反应程序同实施例 1A,不同之处是本实施例中首轮 PCR反 应模板为 IFN-Con 1的质粒。 第二轮 PCR产物经琼脂糖电泳分析, 选择 720bp左右的 DNA片段, 用 Nde I / EcoR I双酶切, 电泳回收 500bp左右的目的 DNA片段备用。
实施例 1C IFN a-2aCys8S的基因构建和扩增
引物设计同实施例 1B, PCR反应程序同实施例 1A, 不同之处是 本实施例中首轮 PCR'反应模板为 IFN a-2a的质粒。第二轮 PCR产物 经琼脂糖电泳分析,选择 720bp左右的 DNA片段,用 Nde I / EcoR I 双酶切, 电泳回收 500bp左右的目的 DNA片段备用。 实施例 ID IFN a-2bCys8S的基因构建和扩增
引物设计同实施例 1B, PCR反应程序同实施例 1A, 不同之处是 本实施例中首轮 PCR反应模板为 IFN a-2b的质粒。第二轮 PCR产物 经琼脂糖电泳分析,选择 720bp左右的 DNA片段,用 Nde I / EcoR I 双酶切, 电泳回收 500bp左右的目的 DNA片段备用。 实施例 2A MIFNCys86重组质粒的构建、 转化和鉴定
在重组质粒的构建和转化中, 内切酶往往可以有多种选择, 连接 反应的条件也可以有所变化,都可以完成重组质粒的构建; 本实施例 中宿主细胞选择了实验室常用的 JM109和 DH5a,并不排斥用其他宿 主进行转化。 本着科学、 方便和快捷的原则, 本实施例所列重组质粒 的构建、 转化和鉴定方案为优选方案(同样原因, 实施例 2B ~ 2D所 列也为优选方案)。
将 pET-23b质粒载体用 Nde I / EcoR I双酶切, 经琼脂糖电泳回 收并和实施例 1A中最后回收的目的 DNA片段连接。 连接反应条件 为: 2x Rapid buffer 4 ~ 5μ1、 Τ4 DNA Ligase 1 μ1、 目的片段 1 ~ 2μ1、 载体 3μ1, 4°C过夜连接。
制备 JM109或 DH5a感受态细胞, 转化上述连接产物, 涂布氨苄 平板, 37°C过夜培养。
挑取单菌落作为模板, 用本发明实施例 1A中设计的引物 Pl、 P2 进行 PCR扩增, 扩增产物经琼脂糖电泳(电泳图谱如图 2所示), 阳 性克隆应在 720 bp左右出现特异条带。 取阳性克隆小量培养, 提取 质粒用 Nde I / EcoR I双酶切, 分别在 3kb左右和 500bp左右出现 特异的条带 (琼脂糖电泳图谱如图 3所示), 与预计情况相符, 初步 说明重组质粒构建成功。 为了进一步确认其序列, 以 T7通用引物通 过 ABI377测序仪进行全自动序列测定, 结果表明所获得的序列与目 标序列相一致。 实施例 2B IFN-Coii lCys86重组质粒的构建、 转化和鉴定
本实施例中连接的基因片段为实施例 1B回收的目的基因片段。 连接、 转化及鉴定操作中用到的技术和方法与实施例 2A完全相同。 Nde I / EcoR I酶切鉴定电泳图谱如图 3所示。 为确认序列, 同样以 T7通用引物通过 ABI377测序仪进行全自动序列测定,结果表明所获 得的序列与目标序列相一致。
实施例 2C IFN a-2aCys8S重组质粒的构建、 转化和鉴定
本实施例中连接的基因片段为实施例 1C回收的目的基因片段。 连接、 转化及鉴定搡作中用到的技术和方法与实施例 2A完全相同。 Nde I / EcoR I酶切鉴定电泳图谱如图 3所示。 为确认序列, 同样以 T7通用引物通过 ABI377测序仪进行全自动序列测定,结果表明所获 得的序列与目标序列相一致。
实施例 2D IFN a-2bCys85重组质粒的构建、 转化和鉴定
本实施例中连接的基因片段为实施例 1D回收的目的基因片段。 连接、 转化及鉴定操作中用到的技术和方法与实施例 2A完全相同。 Nde I / EcoR I酶切鉴定电泳图谱如图 3所示。 为确认序列, 同样以 T7通用引物通过 ABI377测序仪进行全自动序列测定,结果表明所获 得的序列与目标序列相一致。 实施例 3A MIFNCys86的表达和纯化
将实施例 2A中得到的重组质粒转化大肠杆菌 BL21 ( DE3 )或其 他适宜宿主, 诱导表达。 以大肠杆菌 BL21 ( DE3 )作为宿主时表达 的 MIFNCys86约占菌体总蛋白的 30 ~ 50%, 主要以包涵体形式存在。
粗纯: 将发酵收集的菌体以 TE溶解, 超声破菌后收集包涵体, 然后用 6 ~ 8mol/L的 Gu*HCl或尿素溶解,室温搅拌或 4Ό放置过夜, 再用浓度为 0.05 ~ 0.2mol/L、 pH 8.0 ~ 10.5的硼酸复性,复性液置 4°C 过夜。 4°C离心取上清, 即为粗纯的 MIFNCys86。 精纯: 依次釆用了疏水层析、 DEAE阴离子交换层析和 S-100凝 胶排阻层析三步纯化工艺。具体步骤如下: 将复性液稀释成含 10% ~ 30% (NH4)2S04的溶液上样到 Phenyl Sepharose层析柱, 用两个柱体 积的 10% ~ 30%(NH4)2SO4冲洗,然后用 15% ~ 35%乙二醇进行洗脱, 收集洗脱峰组分用 A液(10 - 80 mmol I L Tris-HCl pH7.5― 10.5 ) 充分透析; 将透析后的洗脱液上样到用 A 液充分平衡的 DEAE Sepharose FF层析柱,然后用 B液(含 0.2 ~ 0.4 mol I L NaCl 的 A液) 进行洗脱, 收集洗脱峰组分; 将 DEAE Sepharose FF离子交换层析的 洗脱峰组分上样到用 C液 ( 20 ~ 40 mmol / L PB + 20 ~ 40 mmol I L NaCl Ph6.5 - 7.5 )充分平衡好的 Sephacryl S-100层析柱, 用 C液冲 洗, 收集洗脱峰组分。 经以上纯化流程后, 最后得到的 MIFNCys86纯 度在 95%以上( SDS-PAGE图谱如图 4所示)。
实施例 3B IFN-Con lCys86的表达和纯化
将实施例 2B中得到的重组质粒转化大肠杆菌 BL21 ( DE3 )或其 他适宜宿主, 诱导表达。 以大肠杆菌 BL21 ( DE3 )作为宿主时表达 的 IFN-Con lCyS86约占菌体总蛋白的 30 ~ 50%, 主要以包涵体形式存 在。
本实施例纯化方法和步骤与实施例 3A 完全相同。 最后得到的 IFN-Con lCys86纯度在 95%以上( SDS-PAGE图谱如图 4所示)。
实施例 3C IFN a-2aCys85的表达和纯化
将实施例 2C中得到的重组质粒转化大肠杆菌 BL21 ( DE3 )或其 他适宜宿主, 诱导表达。 以大肠杆菌 BL21 ( DE3 )作为宿主时表达 的 IFN a-2acys85约占菌体总蛋白的 30 ~ 50%,主要以包涵体形式存在。
粗纯: 本实施例所用到的粗纯方法与实施例 3A相同。
精纯:依次采用了 DEAE阴离子交换层析、单抗亲和层析和 S-100 凝胶排阻层析三步纯化工艺。 具体方法: 将复性液以 30 mmol I L Tris-HCl (pH8.0)稀释 10倍上样到 DEAE Sepharose FF离子交换层析 柱,用含 0.3mol / L NaCl 的 30 mmol / L Tris-HCl (pH7.0) 溶液洗脱, 收集洗脱峰; 将上一步洗脱样品经 PBS(pH7.0)3倍稀释, 上样到 IFN a-2a单抗层析柱, 以含 100 mmol I L NaCl 的 0.3 mol I L Gly溶液 (pH2.5)洗脱, 收集洗脱峰; 再将上一步洗脱样品上样到 Sephacryl S-100层析柱, 以 PBS(pH7.0)洗脱。 最后得到的 IFN a-2aCys85纯度在 95%以上( SDS-PAGE图谱如图 4所示)。
实施例 3D IFN a-2bCys85的表达和纯化
将实施例 2D中得到的重组质粒转化大肠杆菌 BL21 ( DE3 )或其 他适宜宿主, 诱导表达。 以大肠杆菌 BL21 ( DE3 )作为宿主时表达 的 IFN a-2bCyS85约占菌体总蛋白的 30 ~ 50%,主要以包涵体形式存在。
粗纯: 本实施例所用到的粗纯方法与实施例 3A相同。
精纯:依次釆用了 DEAE阴离子交换层析、单抗亲和层析和 S-100 凝胶排阻层析三步纯化工艺。 具体方法: 将复性液以 30 mmol I L Tris-HCl (pH8.0)稀释 10倍上样到 DEAE Sepharose FF离子交换层析 柱,用含 0.3mol / L NaCl 的 30 mmol / L Tris-HCl (pH7.0) 溶液洗脱, 收集洗脱峰; 将上一步洗脱样品经 PBS(pH7.0)3倍稀释, 上样到 IFN a-2b单抗层析柱, 以含 100 mmol I L NaCl 的 0.3 mol I L Gly溶液 (pH2.5)洗脱, 收集洗脱峰; 再将上一步洗脱样品上样到 Sephacryl S-100层析柱, 以 PBS(pH7.0)洗脱。 最后得到的 IFN a-2bCys85纯度在 95%以上( SDS-PAGE图谱如图 4所示)。 实施例 4 MIFNCys86、 IFN-Con lCys86、 IFN a-2aCys85及 IFN a-2bCys85 的 PEG偶联
本发明四种干扰素 a突变体可以和各种分子量的 PEG偶联, 在 优选实施例中, PEG有两种 mPEG-MAL和 mPEG2-MAL, 平均分子 量分别约为 20KD、 40KD。
1 ) MIFNCys86、 IFN-Con lCys86、 IFN a-2aCys85及 IFN a-2bCys85的浓 缩
以上四种干扰素 α突变体可以分别用 DEAE Sepharose FF层析柱 进行浓缩。 具体方法如下: 将实施例 3A - 3D其中之一纯化的蛋白样 品以 10 ~ 80 mmol I L Tris-HCl pH7.5 ~ 8.5溶液稀释 2倍或以上,上 样到 DEAE层析柱, 然后用 20 mmol / L PB缓冲液 (pH 7.6 ) + 300 mmol / L NaCl的洗脱得到目的蛋白的浓缩液。
2 ) MIFNCys86、 IFN-Con lCys86、 IFN a-2acys85及 IFN a-2bCys85与 mPEG-MAL的偶联
MIFNCys86、 IFN-Con lCys86、 IFN a-2acys85及 IFN a-2bCys85 与 mPEG(20KD)-MAL 偶联反应, 其单 PEG 衍生物分别写做: mPEG(20KD)-MIFNCyS86 、 mPEG(20KD)-IFN-Con lCys86 、 mPEG(20KD)-IFN a-2acys85及 mPEG(20KD)-IFN a-2bCys85
MIFNCys86、 IFN-Con lCys86、 IFN a-2acys85及 IFN a-2bCys85与 mPEG(40 D)-MAL 偶联反应, 其单 PEG 衍生物分别写做: mPEG(40KD)-MIFNCys86 、 mPEG(40KD)-IFN-Con lCys86 、 mPEG(40KD)-IFN a-2aCys85及 mPEG(40KD)-IFN a-2bCys85
偶联反应步骤具体如下:
取本实施例步骤 1 中适量体积的浓缩液, 调整蛋白浓度到 8 ~ 12mg/ml, 加入摩尔比为 1 : 1的 PEG粉末, 轻轻摇动使粉末溶解后 于 4°C反应过夜, 即反应时间应超过 10小时。 SDS-PAGE检测反应 的偶联程度 (图 5-6所示)。
实施例 5 干扰素 α突变体衍生物的纯化
釆用 DEAE Sepharose Fast Flow 离子交换层析对修饰产物进行 纯化, 具体条件如下: 釆用 25mmol pH8.0 Tris 缓冲体系将反应液稀 释 20~30倍后, 以流速为 3~4ml/min上样于平衡过的 DEAE柱,待基 线平衡后, 用含 NaCl浓度为 80mM的 25mM pH8.0 Tris 洗脱液洗脱 得到目的蛋白的洗脱峰。 最后得到的重组蛋白纯度都在 95%以上 ( SDS-PAGE图谱如图 7-8所示)。
实施例 6 通过 WISH-VSV系统测定 4种 α干扰素、 突变体及突变 体聚乙二醇衍生物的体外抗病毒活性
釆用细胞病变抑制法通过 WISH-VSV系统测定干扰素的体外抗 病毒活性, 是本技术领域公知的方法, 具体参照 2005版《中华人民 共和国药典》 三部附录 X C "干扰素的生物活性测定"。
本实施例测定了 16种干扰素 (或衍生物) 的体外抗病毒活性, 具体包括:
4种 α干扰素: Μ顾、 IFN-Con l、 IFN a-2a和 IFN a-2b;
4种 a干扰素的突变体: MIFNCys86、 IFN-Con lCys86、 IFN a-2aCys85 及 IFN a-2bCys85 (本发明实施例 3 A - 3D制备);
还有 8 种聚乙二醇衍生物: mPEG(20KD)-MIFNCys86 、 mPEG(20KD)-IFN-Con lCys86 、 mPEG(20KD)-IFN a-2aCys85 、 mPEG(20KD)-IFN a-2bCys85 、 mPEG(40KD)-MIFNCys86 、 mPEG(40KD)-IFN-Con lCys86 、 mPEG(40KD)-IFN a-2acys85 及 mPEG(40KD)-IFN a-2bCys85 (本发明实施例 5制备)。
其体外抗病毒活性测定结果见下述表 1 - 4。
表 1 : MIFN. MIFNCys86、 mPEG(20KD)-MIFNCyS86及 mPEG(40KD)-MIFNCys86 的体外抗病毒活性
名 称 比活性 (IU/mg ) 活性保留(%)
Figure imgf000016_0001
MIFNcys86 5.68士 0.29X 101 100
mPEG(20KD)-MIFNcys86 5.84±0.35χ10' 1.03
mPEG(40KD)-MIFNcys86 4.12±0.31χ10' 0.73 表 2: IFN-Con 1 、 IFN-Con lCys86、 mPEG(20KD)-IFN-Con lCy mPEG(40KD)-IFN-Con lCys86的体外抗病毒活性
名 称 比活性 (IU/mg ) 活性保留(%)
IFN-Con 1 5.18±0.24χ 108 IFN-Con lCys86 5.13±0.30xl08 100 mPEG(20KD)-IFN-Con lCys86 5.24±0.27><106 1.02
mPEG(40KD)-IFN-Con lCyS86 4.05士 0.25xl06 0.79
表 3: IFN a-2a、IFN a-2acys85、mPEG(20KD)-IFN a-2acys85及 mPEG(40KD)-IFN a-2acys85的体外抗病毒活性
名 称 比活性 (IU/mg ) 活性保留(%)
IFN a-2a 1.09±0.20^108 -
IFN a-2acys85 1.06±0.23>< 108 100
mPEG(20KD)-IFN a-2acys85 1.79±0.30> 106 1.69
mPEG(40KD)-IFN a-2acys85 1.28士 0.21 x 106 1.21
表 4 : IFN a-2b 、 IFN a-2bCys85 、 mPEG(20KD)-IFN a-2bCys85 及 mPEG(40KD)-IFN a-2bCys85的体外抗病毒活性
名 称 比活性 (IU/mg ) 活性保留(%)
IFN a-2b 1.10±0.20 108 -
IFN a-2bCyS85 1.12±0.27 <108 100
mPEG(20KD)-IFN a-2bCyS85 1.64±0.33^106 1.46
mPEG(40KD)-IFN a-2bCys85 1.20±0.26><106 1.07
实施例 7 大鼠药代动力学研究
通过本实施例表 5所示的药代动力学研究方案测定了 12种干扰 素 (或衍生物) 的体外抗病毒活性, 具体包括:
4种 a干扰素的突变体: MIFNCys86、 IFN-Con lCys86、 IFN a-2acys85 及 IFN a-2bCyS85 (本发明实施例 3A ~ 3D制备);
8 种 聚 乙 二 醇 衍 生 物 : mPEG(20KD)-MIFNCys86 、 mPEG(20KD)-IFN-Con lCys86 、 mPEG(20KD)-IFN a-2aCys85 、 mPEG(20KD)-IFN a-2bCys85 、 mPEG(40KD)-MIFNCys86 、 mPEG(40KD)-IFN-Con lCys86 、 mPEG(40KD)-IFN a-2acyS85 及 mPEG(40KD)-IFN a-2bCys85 (本发明实施例 5制备)。 表 5: 药代动力学研究方案: α干扰素的突变体 α干扰素突变体的 PEG衍生物 大鼠 6只 6只
给药途径 皮下 皮下
给药方式 单次 单次
给药剂量 3.3MIU 5.4MIU
取血时间点 0,0.2,0.5 ,0.75,1,2,4,8,12,16,24 0,0.5,2,4,8,12,16,24,48,72,96,168 测定方法 WISH/VSV WISH/VSV
在上述试验方案中, 从大鼠眼底收集血样, 然后离心分离收集血 清, 用 CPE法 (WISH/VSV系统)检测血清样品中干扰素含量。
表 6: MIFNCys86及其 PEG衍生物的药代动力学参数表
PK参数 MIFNCys86 mPEG(20KD)-MIFNcys86 mPEG(40KD)-MIFNCys86 tl/2Ka ( h ) 0.25 15.0 17.1 tl/2Ke ( h ) 1.57 18.0 24.8
Tpeak ( h ) 0.78 24.3 26.5
Cpeak
23823.7 26941.7 30628.6
( ru/mi )
AUC
76230.8 1744758.0 2815579.3 ( IU-h/ml )
经 3P87软件拟合发现 MIFNCys86及其 PEG衍生物在 SD大鼠体 内的代谢规律符合一级吸收的一房室模型。 PEG 化可显著改善 MIFNCys86的药代动力学性质, 与 MIFNCys86相比, mPEG- MIFNCys86 的吸收半衰期、 达峰时间、 消除半衰期显著延长; 药时曲线下面积显 著增加; 清除率显著降低。 可见, PEG化可以延长 MIFNCys86的体内 平均存留时间, 降低清除率。
在 IFN-Con 1 CyS86及其 PEG衍生物、 IFN a-2aCys85及其 PEG衍生 物、 IFN a-2bCyS85及其 PEG衍生物的药代动力学试验中也有同样发现, 即: 与修饰前相比, PEG化的干扰素的吸收半衰期、 达峰时间、 消除 半衰期显著延长; 药时曲线下面积显著增加; 清除率显著降低。
由此证明, PEG化可以延长干扰素的体内平均存留时间, 降低清 除率。
至此, 已经对本发明进行了较为充分的描述。优选的实施例只能 阐述而不限制本发明, 对于本领域的技术人员来说, 实现本发明的方 法和手段可以变化和改进, 均应涵盖在本发明的保护范围之内。
工业实用性 动物实验表明本发明干扰素突变体的聚乙二醇衍生物可以延长 干扰素的体内平均存留时间, 降低清除率, 并且具有较高的抗病毒活 性,因而,可以按照本发明所述的方法或本领域技术人员所知的方法, 通过制备本发明所述干扰素突变体, 并进一步与聚乙二醇共价结合, 并开发成药物, 用于免疫调节紊乱如肿瘤疾病或传染病的预防和治 疗。
附序列表:
后面附氨基酸和核苷酸的序列表, 其中 IFN-Con l、 IFN a-2a和 IFN a-2b 的 核苷酸序列为公知序列,在本发明的具体实施例中只是把相应位点的密码子突变 成 tgc, 因此本发明未附 IFN-Con lCys86、 IFN a-2acys85和 IFN a-2bCys85的 DNA序 列。
SEQ ID NO: 1为 MIFNCys86的氨基酸序列;
SEQ ID NO:2为 IFN-Con lCys86的氨基酸序列;
SEQ ID NO:3为 IFN a-2acys85的氨基酸序列;
SEQ ID NO:4为 IFN a-2bCys85的氨基酸序列;
SEQ ID NO:5为 MIFNCys86的 DNA序列;
SEQ ID NO:6~9分别为引物 P1~P4的核苷酸序列。

Claims

权利要求书
1、 干扰素 α突变体, 其特征在于干扰素 α氨基酸序列的第 85位 或 86的 Tyr突变为 Cys。
2、 根据权利要求 1 所述的干扰素 a突变体, 其具有序列表 1~4 任一所述的氨基酸序列。
3、 编码权利要求 1或 2所述干扰素 α突变体的核苷酸序列。
4、 权利要求 1或 2所述干扰素 α突变体的聚乙二醇衍生物。
5、 根据权利要求 4所述的干扰素 α突变体的聚乙二醇衍生物,其 特征在于, 聚乙二醇修饰于干扰素 α突变体的第 85或 86位的 Cys 位点。
6、 根据权利要求 4或 5所述的干扰素 α突变体的聚乙二醇衍生 物,其是由聚乙二醇巯基修饰剂与干扰素 α突变体的第 85或 86位的 Cys反应获得, 所述聚乙二醇巯基修饰剂选自马来酰亚胺 -PEG、 乙烯 砜 -PEG、 碘代乙酰胺 -PEG及正吡啶基二硫化物 -PEG。
7、 根据权利要求 4或 5所述的干扰素 α突变体的聚乙二醇衍生 物, 其特征在于聚乙二醇的平均分子量为 5000道尔顿〜 60000道尔 顿。
8、 一种制备干扰素 α突变体的聚乙二醇衍生物的方法,包括以下' 步骤:
a) 制备浓缩的干扰素 α突变体溶液;
b) 聚乙二醇与步骤(a )所述干扰素 α突变体偶联反应;
c) 干扰素 α突变体的聚乙二醇衍生物的纯化提取。
9、 药物组合物, 其含有根据权利要求 4~7任一项所述的干扰素 α 突变体的聚乙二醇衍生物。
10、 权利要求 9所述的药物组合物在治疗或预防病毒性感染或 肿瘤中的应用。
PCT/CN2007/003711 2006-12-21 2007-12-21 Interferon alpha mutant and its polyethylene glycol derivative WO2008074230A1 (en)

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KR1020097013006A KR101149607B1 (ko) 2006-12-21 2007-12-21 인터페론 알파 돌연변이체 및 이의 폴리에틸렌 글리콜 유도체
JP2009541739A JP5407044B2 (ja) 2006-12-21 2007-12-21 インターフェロンα変異体およびそのポリエチレングリコール誘導体
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102532300A (zh) * 2012-02-23 2012-07-04 北京三元基因工程有限公司 干扰素α突变体及其聚乙二醇衍生物
CN102532299A (zh) * 2012-02-23 2012-07-04 北京三元基因工程有限公司 干扰素α突变体及其聚乙二醇衍生物

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CL2008002399A1 (es) 2007-08-16 2009-01-02 Pharmaessentia Corp Conjugado sustancialmente puro que posee una porcion polimerica, una porcion proteica (interferon alfa 2b) y un ligante alifatico de 1 a 10 atomos de carbono, util en el tratamiento de las hepatitis b o c.
CN101525381B (zh) * 2008-03-04 2012-04-18 北京百川飞虹生物科技有限公司 一种重组复合干扰素及其表达载体的构建和表达
CN101768205A (zh) * 2010-03-01 2010-07-07 安徽安科生物工程(集团)股份有限公司 一种聚乙二醇修饰干扰素反应液中回收干扰素的方法
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CN103145826B (zh) * 2012-02-23 2014-05-28 北京三元基因工程有限公司 干扰素α突变体及其聚乙二醇衍生物
CN103554246B (zh) * 2012-02-23 2015-04-01 北京三元基因工程有限公司 干扰素α突变体及其聚乙二醇衍生物
PL3215193T3 (pl) 2014-11-06 2024-03-18 Pharmaessentia Corporation Reżim podawania pegylowanego interferonu
CN107556376B (zh) * 2017-09-08 2018-09-28 上海华新生物高技术有限公司 一种干扰素α-2b突变体及其制备方法和应用

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1355842A (zh) * 1999-01-14 2002-06-26 博尔德生物技术公司 制备含游离半胱氨酸残基的蛋白质的方法
KR20020067105A (ko) * 2001-02-15 2002-08-22 선바이오(주) 변형된 인터페론-알파 2a 및 2b, 그리고 이들과 PEG유도체와의 배합체
CN1511849A (zh) * 2002-12-30 2004-07-14 北京三元基因工程有限公司 新型α干扰素突变体及其制备方法
CN1738640A (zh) * 2002-11-18 2006-02-22 马克西根公司 干扰素-α多肽和偶联物
CN1754889A (zh) * 2004-06-30 2006-04-05 深圳科兴生物工程有限公司 PEG化干扰素α-1b

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7314613B2 (en) * 2002-11-18 2008-01-01 Maxygen, Inc. Interferon-alpha polypeptides and conjugates
CA2504267A1 (en) * 2002-11-18 2004-06-03 Maxygen, Inc. Interferon-alpha polypeptides and conjugates
JP2008509889A (ja) * 2004-06-30 2008-04-03 イージェン コーポレーション ペグ化インターフェロンα−1b

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1355842A (zh) * 1999-01-14 2002-06-26 博尔德生物技术公司 制备含游离半胱氨酸残基的蛋白质的方法
KR20020067105A (ko) * 2001-02-15 2002-08-22 선바이오(주) 변형된 인터페론-알파 2a 및 2b, 그리고 이들과 PEG유도체와의 배합체
CN1738640A (zh) * 2002-11-18 2006-02-22 马克西根公司 干扰素-α多肽和偶联物
CN1511849A (zh) * 2002-12-30 2004-07-14 北京三元基因工程有限公司 新型α干扰素突变体及其制备方法
CN1754889A (zh) * 2004-06-30 2006-04-05 深圳科兴生物工程有限公司 PEG化干扰素α-1b

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102532300A (zh) * 2012-02-23 2012-07-04 北京三元基因工程有限公司 干扰素α突变体及其聚乙二醇衍生物
CN102532299A (zh) * 2012-02-23 2012-07-04 北京三元基因工程有限公司 干扰素α突变体及其聚乙二醇衍生物

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