WO2010035757A1 - アフィニティークロマトグラフィー用充填剤 - Google Patents
アフィニティークロマトグラフィー用充填剤 Download PDFInfo
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- WO2010035757A1 WO2010035757A1 PCT/JP2009/066554 JP2009066554W WO2010035757A1 WO 2010035757 A1 WO2010035757 A1 WO 2010035757A1 JP 2009066554 W JP2009066554 W JP 2009066554W WO 2010035757 A1 WO2010035757 A1 WO 2010035757A1
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- affinity chromatography
- acid sequence
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
- C07K1/14—Extraction; Separation; Purification
- C07K1/16—Extraction; Separation; Purification by chromatography
- C07K1/22—Affinity chromatography or related techniques based upon selective absorption processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/281—Sorbents specially adapted for preparative, analytical or investigative chromatography
- B01J20/286—Phases chemically bonded to a substrate, e.g. to silica or to polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
- B01J20/3206—Organic carriers, supports or substrates
- B01J20/3208—Polymeric carriers, supports or substrates
- B01J20/321—Polymeric carriers, supports or substrates consisting of a polymer obtained by reactions involving only carbon to carbon unsaturated bonds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3214—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the method for obtaining this coating or impregnating
- B01J20/3217—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond
- B01J20/3219—Resulting in a chemical bond between the coating or impregnating layer and the carrier, support or substrate, e.g. a covalent bond involving a particular spacer or linking group, e.g. for attaching an active group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
- B01J20/3231—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the coating or impregnating layer
- B01J20/3242—Layers with a functional group, e.g. an affinity material, a ligand, a reactant or a complexing group
- B01J20/3268—Macromolecular compounds
- B01J20/3272—Polymers obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds
- B01J20/3274—Proteins, nucleic acids, polysaccharides, antibodies or antigens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
Definitions
- the present invention relates to a packing material for affinity chromatography.
- the present invention relates to a packing material for affinity chromatography to which a specific ligand useful for antibody purification is bound.
- Affinity chromatography is chromatography that uses a column packed with a ligand-immobilized carrier obtained by immobilizing a substance (ligand) that specifically binds to the substance intended for separation and purification on an insoluble carrier, For example, it is used for the separation and purification of biological materials such as proteins and nucleic acids (Japanese Patent Laid-Open No. 6-281638).
- POROS trade name
- This filler uses mother particles mainly composed of a hydrophobic styrene-divinylbenzene copolymer. In this filler, non-specific adsorption, which is considered to be mainly caused by the mother particles, may occur, and when used at a high flow rate, the binding capacity is reduced.
- An object of the present invention is to provide a packing material for affinity chromatography that can maintain a high ligand binding capacity even when separation / purification is performed at a high flow rate that has never been achieved.
- the packing material for affinity chromatography comprises: A porous mother particle containing a copolymer of a monomer mixture containing a crosslinkable vinyl monomer and an epoxy group-containing vinyl monomer, A ligand is bound to the porous mother particle, The porous mother particle has a ring-opened epoxy group obtained by ring-opening an epoxy group contained in the porous mother particle.
- the ring-opening epoxy group can contain a substituted or unsubstituted 2,3-dihydroxypropyl group.
- the ligand may be a protein containing an immunoglobulin binding domain of protein A.
- the immunoglobulin binding domain of protein A may be at least one selected from the A domain, B domain, C domain, D domain, E domain, and Z domain.
- the ligand may be an immunoglobulin binding protein represented by the following general formula (1).
- RR 2 (1) (Wherein R represents an amino acid sequence consisting of 4 to 300 amino acids including a continuous site of 4 to 20 histidines, and R 2 represents 50 to 500 including at least one immunoglobulin binding domain of protein A) (Wherein the terminal where R 2 binds to R is the terminal of the immunoglobulin binding domain).
- R- can be a group represented by the following general formula (2).
- R 1 represents an amino acid sequence consisting of 4 to 100 amino acids including a site in which 4 to 20 histidines are continuous (wherein, in R 1 , the end of the site in which the histidines are continuous is r and And r represents an arbitrary amino acid sequence consisting of 7 to 200 amino acids including the TEV domain.)
- the ligand is one type in which at least one of the amino acid sequence represented by R and the amino acid sequence represented by R 2 in the general formula (1) is selected from lysine, arginine, and cysteine. And a domain t consisting of 1 to 50 amino acids including
- the ligand may be an immunoglobulin binding protein represented by the following general formula (3).
- R 2 -R (3) (Wherein R represents an amino acid sequence consisting of 4 to 300 amino acids including a continuous site of 4 to 20 histidines, and R 2 represents 50 to 500 including at least one immunoglobulin binding domain of protein A) (Wherein the terminal where R 2 binds to R is the terminal of the immunoglobulin binding domain).
- —R can be a group represented by the following general formula (4).
- R 1 represents an amino acid sequence consisting of 4 to 100 amino acids including a site in which 4 to 20 histidines are continuous (wherein, in R 1 , the end of the site in which the histidines are continuous is r and And r represents an arbitrary amino acid sequence consisting of 7 to 200 amino acids including the TEV domain.)
- the ligand is one type in which at least one of the amino acid sequence represented by R and the amino acid sequence represented by R 2 in the general formula (3) is selected from lysine, arginine, and cysteine. And a domain t consisting of 1 to 50 amino acids including
- protein refers to any molecule having a peptide structural unit, for example, a concept including a partial fragment of a natural protein or a variant obtained by artificially modifying the amino acid sequence of a natural protein.
- the “immunoglobulin binding domain” represents a functional unit of a polypeptide having immunoglobulin binding activity alone, and the “immunoglobulin binding protein” has a specific affinity for immunoglobulin, and Represents a protein comprising an “immunoglobulin binding domain”.
- TEV domain refers to a site cleaved by TEV (Tobacco Etch Virus) protease.
- porous mother particles containing a copolymer of a monomer mixture containing a crosslinkable vinyl monomer and an epoxy group-containing vinyl monomer
- a ligand is bonded to the particle, and the porous mother particle has a ring-opened epoxy group obtained by ring-opening an epoxy group contained in the porous mother particle.
- High ligand binding capacity can be maintained even during separation and purification at high flow rates.
- FIG. 1 is a view showing the amino acid sequences of immunoglobulin binding proteins (SPAK, SPAC, SPAKK, SPATK) prepared in Synthesis Example 1 of the present invention.
- FIG. 2 is a view showing amino acid sequences of immunoglobulin binding proteins (SPA2K, SPA3K, SPA-His-C, SPA-His-N) prepared in Synthesis Example 1 of the present invention.
- FIG. 3 is a diagram for explaining the structure of a DNA fragment encoding the immunoglobulin binding protein according to Synthesis Example 1 of the present invention, which is inserted into each of three types of expression vectors (pETM-11, pETM-10 and pET29). is there.
- a filler for affinity chromatography is a porous mother particle containing a copolymer of a monomer mixture containing a crosslinkable vinyl monomer and an epoxy group-containing vinyl monomer.
- the ligand is bonded to the porous mother particle, and the porous mother particle has a ring-opened epoxy group obtained by ring-opening an epoxy group contained in the porous mother particle.
- the filler for affinity chromatography (porous mother particles) according to this embodiment is mainly composed of a copolymer of a monomer mixture containing a crosslinkable vinyl monomer and an epoxy group-containing vinyl monomer. Is preferred.
- cross-linkable vinyl monomer an aromatic polyvinyl monomer and an aliphatic polyvinyl monomer are suitable.
- aromatic polyvinyl monomer divinylbenzene is used. Is preferably a polyvalent (meth) acrylate compound.
- the above-mentioned epoxy group-containing vinyl monomer is a vinyl monomer containing an epoxy group in the molecule.
- (meth) such as glycidyl (meth) acrylate and ⁇ - (meth) acryl- ⁇ -glycidyl polyethylene glycol Acrylic acid esters; aromatic vinyl compounds such as vinylbenzyl glycidyl ether and the like, and glycidyl methacrylate and vinylbenzyl glycidyl ether are particularly preferable.
- the filler for affinity chromatography is preferably a porous material containing a copolymer of 20 to 50% by weight of a crosslinkable vinyl monomer and 50 to 80% by weight of an epoxy group-containing vinyl monomer. It is preferable to use porous organic polymer particles.
- the crosslinkable vinyl monomer is less than 20% by weight of the total amount of the monomer, the strength of the filler is inferior, so the filler may be destroyed at a high flow rate, and the column pressure may increase.
- the crosslinkable vinyl monomer exceeds 50% by weight of the total amount of the monomers, it is difficult to control the pore diameter and the binding capacity may be reduced.
- the filler for affinity chromatography according to this embodiment may contain another vinyl monomer as a copolymer component, and the content of the other vinyl monomer is preferably 0 to 30% by weight. It is.
- the filler for affinity chromatography preferably has a particle diameter (volume average particle diameter) of 20 to 80 ⁇ m, more preferably 30 to 60 ⁇ m.
- the “particle diameter” in the present invention is a volume average particle diameter obtained by a laser diffraction / scattering particle size distribution measuring apparatus.
- the packing material for affinity chromatography preferably has a specific surface area of 50 to 150 m 2 / g, more preferably 80 to 120 m 2 / g.
- the specific surface area is less than 50 m 2 / g, the binding capacity may be inferior.
- the specific surface area exceeds 150 m 2 / g, the strength of the filler is inferior and the filler is destroyed at a high flow rate. Column pressure may increase.
- the “specific surface area” in the present invention is a value obtained by dividing the surface area of pores having a pore diameter of 10 to 5000 nm obtained by a mercury porosimeter by the dry weight of the particles.
- the filler for affinity chromatography preferably has a volume average pore diameter of 100 to 400 nm, more preferably 200 to 300 nm.
- the “volume average pore diameter” in the present invention is a volume average pore diameter of pores having a pore diameter of 10 to 5000 nm obtained by a mercury porosimeter.
- the balance between the gaps between the particles to be the flow path of the solution to be purified and the relatively large pore size in the particle and the binding surface area of the molecule to be purified is optimal. And the binding capacity under high flow rate is maintained at a high level.
- porous mother particles used as the affinity chromatography filler according to this embodiment include, for example, 20 to 50% by weight of a crosslinkable vinyl monomer and 50 to 80% by weight of an epoxy group.
- the infiltration volume (pore volume) of pores having a pore diameter of 10 to 5000 nm when the affinity chromatography filler according to this embodiment is measured with a mercury porosimeter is preferably 1.3 to 2.5 mL / g.
- the porous mother particles used as a filler for affinity chromatography according to the present embodiment can be produced, for example, by known seed polymerization, suspension polymerization, or the like.
- seed polymerization method a two-stage swelling polymerization method described in JP-B-57-24369 is also preferably used.
- water and porogen are essential components, and a polymerization initiator, a polymer dispersant, a surfactant, a salt, seed particles, and the like are used as necessary.
- porogens include organic solvents such as aliphatic or aromatic hydrocarbons, esters, ketones, ethers, and alcohols.
- organic solvents include toluene, ethylbenzene, cumene, n-propylbenzene, n-butylbenzene, t-butylbenzene, sec-butylbenzene, iso-butylbenzene, xylene, ethyltoluene, cymene, t- Butyl toluene, diisopropylbenzene, mesitylene, cyclohexane, octane, isooctane, butyl acetate, dimethyl phthalate, methyl ethyl ketone, 2-octanone, 3-octanone, 4-octanone, diisobutyl ketone, 2-nonanone, 3-nonanone, 4-nonanone,
- polymerization initiator examples include peroxide initiators such as benzoyl peroxide, lauroyl peroxide, tertiary butyl peroxy 2-ethyl hexanate, 3,5,5-trimethyl hexanoyl peroxide, azobisisobutyronitrile, azobis An azo initiator such as isovaleronitrile is preferred.
- peroxide initiators such as benzoyl peroxide, lauroyl peroxide, tertiary butyl peroxy 2-ethyl hexanate, 3,5,5-trimethyl hexanoyl peroxide, azobisisobutyronitrile, azobis An azo initiator such as isovaleronitrile is preferred.
- water-soluble polymers such as polyvinyl alcohol and polyvinyl pyrrolidone having a saponification degree of 80 to 95% can be used.
- surfactants anionic surfactants such as sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, polyoxyethylene dodecyl ether sulfate ester salts, nonionic surfactants such as polyoxyethylene alkyl ether, etc. should be used.
- the salt sodium chloride, sodium sulfate and the like can be preferably used.
- polystyrene particles having a molecular weight of about 1,000 to 100,000, polyalkyl (meth) acrylate particles, and the like can be used.
- the particle size required for the filler of the present invention can be obtained by adjusting the size and amount of seed particles, the amount of monomer, and the amount of porogen.
- the particle size required for the filler of the present invention is obtained by adjusting the type and amount of the polymer dispersant and the surfactant, the stirring speed, the shape and size of the stirring blade and the polymerization vessel. Can do.
- Examples of the ligand binding method include (1) a method in which an epoxy group contained in a porous mother particle is directly used as a ligand binding site (for example, a method described in JP-T-2006-511935), and (2) porosity.
- the alcoholic hydroxyl group generated by ring opening of the epoxy group contained in the mother particle is activated with a tosyl group or the like to bind the ligand, or the alcoholic hydroxyl group is oxidatively opened using an oxidizing agent and then the ligand.
- a method for example, a method described in Japanese Patent Application Laid-Open No. 2007-211076 or Japanese Patent Application Laid-Open No.
- the epoxy group on the surface is substantially ring-opened before being used as a packing material for affinity chromatography. That is, the filler for affinity chromatography according to the present embodiment has a ring-opened epoxy group.
- the ring-opened epoxy group is obtained by opening the epoxy group contained in the porous mother particle before or after bonding the ligand to the porous mother particle.
- the “ring-opening epoxy group” refers to a group in which an epoxy group is opened, and more specifically, for example, a nucleophilic group having a hydroxide ion, a chloride ion, a mercapto group, an amino group, or the like. A group in which an epoxy group is opened by reacting a compound or the like with an epoxy group.
- the alcoholic hydroxyl group produced by the ring opening of the epoxy group makes the copolymer surface hydrophilic, prevents non-specific adsorption of proteins, etc., improves the toughness of the particles in water, and destroys particles at high flow rates. Play a role to prevent.
- Examples of the ring-opening method of the epoxy in the porous mother particles include a method of heating or stirring at room temperature with an acid or alkali in an aqueous solvent.
- the epoxy group may be ring-opened with a blocking agent having a mercapto group such as mercaptoethanol or a blocking agent having an amino group such as monoethanolamine.
- the ring-opened epoxy group includes, for example, a group formed by opening an epoxy group, a group in which a ligand is bonded to the group formed by opening the ring, and It may be any group in which a ligand is bonded to the group generated by the ring opening via a linker, and is preferably at least one of these groups.
- the porous mother particle is substituted or unsubstituted 2,3-dihydroxy as a ring-opened epoxy group in that the surface of the copolymer can be hydrophilized and nonspecific adsorption of proteins and the like can be more effectively prevented. It preferably contains a propyl group.
- An unsubstituted 2,3-dihydroxypropyl group can be obtained, for example, by opening a glycidyl group by hydrolysis.
- the substituted 2,3-dihydroxypropyl group can be obtained, for example, by opening the glycidyl group with a blocking agent having a mercapto group such as mercaptoethanol or a blocking agent having an amino group such as monoethanolamine.
- Ligand The type of ligand is not particularly limited as long as it has affinity for the target.
- proteins such as protein A, protein G, and avidin; peptides such as insulin; antibodies such as monoclonal antibodies Enzyme; hormone; DNA; RNA; carbohydrate such as heparin, Lewis X, ganglioside; iminodiacetic acid, synthetic dye, 2-aminophenylboronic acid, 4-aminobenzamidine, glutathione, biotin and derivatives thereof Compounds can be used.
- the ligand illustrated above may use the whole, the fragment obtained by a recombinant, an enzyme treatment, etc. may be used. Further, it may be an artificially synthesized peptide or peptide derivative.
- Preferred ligands for antibody purification are protein A and protein G, more preferably protein A immunoglobulin binding domain, most preferably 4 or more consecutive at the end of protein A immunoglobulin binding domain.
- a protein containing a peptide containing a histidine unit examples include an immunoglobulin-binding protein represented by the following general formula (1) or (3).
- Immunoglobulin binding protein (hereinafter also referred to as “protein 1”), which is an example of a preferred ligand, is represented by the following general formula (1).
- RR 2 (1) (Wherein R represents an amino acid sequence consisting of 4 to 300 amino acids including a continuous site of 4 to 20 histidines, and R 2 represents 50 to 500 including at least one immunoglobulin binding domain of protein A) (Wherein the terminal where R 2 binds to R is the terminal of the immunoglobulin binding domain).
- the number of amino acids contained in the amino acid sequence represented by R is preferably 8 to 100, and the number of histidines at sites where histidines contained in R are continuous is 4 to 8 It is preferable that In the general formula (1), the number of amino acids contained in the amino acid sequence represented by R 2 is preferably 120 to 480.
- R- is preferably a group represented by the following general formula (2).
- R 1 represents an amino acid sequence consisting of 4 to 100 amino acids including a site in which 4 to 20 histidines are continuous (wherein, in R 1 , the end of the site in which the histidines are continuous is r and And r represents an arbitrary amino acid sequence consisting of 7 to 200 amino acids including the TEV domain.)
- the number of amino acids contained in the amino acid sequence represented by R 1 is 4 to 25, the number of histidine site histidine continuous contained in R 1 is 4- The number is preferably 8.
- the number of amino acids contained in the amino acid sequence represented by r is preferably 10-50.
- protein 2 An immunoglobulin-binding protein (hereinafter also referred to as “protein 2”), which is another example of a preferable ligand, is represented by the following general formula (3).
- R 2 -R (3) (Wherein R represents an amino acid sequence consisting of 4 to 300 amino acids including a continuous site of 4 to 20 histidines, and R 2 represents 50 to 500 including at least one immunoglobulin binding domain of protein A) (Wherein the terminal where R 2 binds to R is the terminal of the immunoglobulin binding domain).
- the number of amino acids contained in the amino acid sequence represented by R is preferably 8 to 100, and the number of histidines at sites where histidines contained in R are continuous is 4 to 8 It is preferable that In the general formula (1), the number of amino acids contained in the amino acid sequence represented by R 2 is preferably 120 to 480.
- -R is preferably a group represented by the following general formula (4).
- R 1 represents an amino acid sequence consisting of 4 to 100 amino acids including 4 to 20 consecutive histidines (wherein, in R 1 , the end of the site where the histidine continues is bound to r) And r represents an arbitrary amino acid sequence consisting of 7 to 200 amino acids including the TEV domain.
- the number of amino acids contained in the amino acid sequence represented by R 1 is preferably 4 to 25, and the number of histidines at sites where histidines contained in r are continuous is 4 to 8
- the number of amino acids contained in the amino acid sequence represented by r is preferably 10 to 50.
- one amino acid at least one of the amino acid sequence represented by amino acid sequence and R 2 is represented by R is, selected lysine, arginine, and cysteine It preferably contains a domain t consisting of 1 to 50 amino acids including In this case, the same or different domain t may be contained in the amino acid sequence.
- the amino acid sequence represented by r may contain a TEV domain. Since the TEV domain is contained in the amino acid sequence represented by r, it is possible to separate R and R 2 by cleavage with TEV protease, and the TEV domain has the effect of the present invention (immobilization on a carrier). This is a preferable sequence for realizing a large amount and increasing the ability of the carrier to retain immunoglobulin). Further, in the amino acid sequence represented by r, a TEV domain mutant (mutant) (regardless of whether or not it can be cleaved by the TEV protease, the amino acid sequence of the TEV domain is 70% or more, preferably 90% or more of homology. May be included).
- the total number of amino acids constituting the protein 1 or 2 of the present invention is usually 70 to 1000, and preferably 80 to 600 when used for binding to particles.
- the immunoglobulin binding domain of protein A is preferably at least one selected from the A domain, B domain, C domain, D domain, E domain, and Z domain.
- the amino acid sequences of the domains of A domain, B domain, C domain, D domain, and E domain are, for example, Moks T, Abrahms L, et al., Staphylococcal protein A consists of five IgG-binding domains, Eur J Biochem. 1986, 156, 637-643, described in Fig. 1.
- the document is included in the disclosure by this reference.
- a protein comprising an amino acid sequence having 70% or more (preferably 90% or more) homology with the amino acid sequence of each domain described in the above document should also be used as an immunoglobulin binding domain of protein A in the present invention. Can do.
- the immunoglobulin binding protein according to this embodiment may have a plurality of the same or different types of immunoglobulin binding domains.
- the immunoglobulin binding domain of protein A is (D domain-A domain) n (where n is an integer of 1 or more (preferably 1 to 6), and any number between D domain and A domain)
- the amino acid sequence of A domain and D domain may be included.
- the immunoglobulin A binding domain of protein A may be a natural immunoglobulin binding domain or a recombinant immunoglobulin binding domain.
- the recombinant immunoglobulin binding domain can be treated as equivalent to the immunoglobulin binding domain before modification in immunoglobulin binding activity.
- the amino acid of the immunoglobulin binding domain of natural protein A It is preferable to maintain a homology of 70% or more (preferably 90% or more) with the sequence.
- Specific examples include the Z domain described in Nilson B et al., Protein Engineering, 1987, Vol. 1, No. 2, pages 107-113, USA by Hober S et al. Examples include Z domain mutants having alkali resistance described in Patent Application 2006 / 0194955A1.
- a protein comprising an amino acid sequence having 70% or more (preferably 90% or more) homology with the amino acid sequence of each domain described in the above document should also be used as an immunoglobulin binding domain of protein A in the present invention. Can do.
- the protein 1 or 2 of the present invention can be obtained in large quantities and economically.
- any known vector capable of replicating in bacteria can be used.
- plasmids described in US Pat. No. 5,151,350, Molecular edited by Sambrook et al. Cloning (Cold Spring Harbor Laboratory Press, 3 rd edition, 2001) include plasmids such as those described in.
- Any method known in the art may be used to transform a bacterium by introducing a nucleic acid into the bacterium, for example, Molecular Cloning (Cold Spring Harbor Laboratory Press, edited by Sambrook et al. 3 rd edition, 2001) can be utilized known methods described in the like. Methods for cultivating transformed bacteria and recovering the expressed protein are well known to those skilled in the art.
- the nucleic acid according to another embodiment of the present invention encodes an immunoglobulin binding protein (protein 1 or 2) or an equivalent functional variant thereof.
- “functional variant” of an immunoglobulin-binding protein is an immunoglobulin-binding protein that has been altered by partial amino acid addition, deletion, substitution, chemical modification of amino acid residues, or the like. And having at least 70%, preferably 90% or more homology with the amino acid sequence of the immunoglobulin binding protein before modification, and having the same immunoglobulin binding activity as that of the immunoglobulin binding protein before modification. It means something that can be handled.
- one immunoglobulin binding domain of protein A is a small protein consisting of about 60 amino acids
- DNA encoding a desired amino acid sequence is divided into synthetic oligonucleotides consisting of several tens of bases. Then, they are ligated by a ligation reaction with DNA ligase and inserted into a plasmid, whereby a target expression vector can be obtained.
- a target expression vector can be obtained.
- it is a method generally performed by those skilled in the art to employ a nucleic acid sequence using an optimal codon of Escherichia coli.
- the protein 1 or 2 of the present invention may be a protein containing one or more immunoglobulin binding domains (preferably 2 to 12, more preferably 2 to 5).
- a cDNA encoding such a protein can be easily prepared by linking a predetermined number of cDNAs (complementary DNAs) encoding one immunoglobulin binding domain in series. By inserting the cDNA thus prepared into an appropriate expression plasmid and using it, a protein containing one or more immunoglobulin binding domains can be easily produced.
- a protein having the amino acid sequence of SEQ ID NOs: 1 to 8 shown in Examples described later, or an amino acid sequence in which one or several amino acids are deleted, substituted or added in SEQ ID NOs: 1 to 8, and A protein having immunoglobulin binding activity can be suitably used as the immunoglobulin binding protein of the present invention.
- the packing material using the protein 1 or 2 of the present invention as a ligand has a larger amount of immunoglobulin-binding protein in affinity chromatography than the conventional packing material, and has an excellent ability to retain the protein. ing. Thereby, since the capture amount of the target protein can be increased, the binding capacity of the target protein (antibody) can be increased. As a result, a high-purity target protein can be purified efficiently, at low cost and in large quantities.
- the binding capacity of the human IgG antibody at a linear flow rate of 300 cm / hr was measured using a column with an inner diameter of 0.5 cm and a height of 5 cm, using AKTAprime plus manufactured by GE Healthcare Bioscience.
- a human IgG antibody manufactured by Lampire Biological Laboratories
- diluted to 1 mg / mL with 25 mM citrate buffer (pH 6.0) was used, and the elution tip concentration was 10 w / v% with an absorbance monitor.
- the binding capacity was determined from the amount of human IgG antibody adsorbed and the filler volume during breakthrough.
- R and R 2 correspond to R and R 2 in the general formula (1) or the general formula (2) (R 1, R 2 and r are the general formula (2) or corresponds to R 1, R 2 and r in the general formula (4).), underlined in r indicates a TEV domain (TEV protease (peptide bond hydrolysis synthase) cleavage site), in R 2 The underlined portion indicates an interdomain linker or C-terminal linker (domain t), see Table 2.
- TEV domain TEV protease (peptide bond hydrolysis synthase) cleavage site
- DNA fragments encoding SPAK, SPAC, SPA2K, SPA3K, SPAKK, and SPATK were digested with restriction enzymes NcoI and HindIII (New-England Bio Bio Lab) to produce vector pETM-11. (See FIG. 3, obtained from kind giftof D. Shibly, EMBL Heidelberg, Heidelberg, yGermany).
- the DNA fragment encoding SPA-His-N was digested with restriction enzymes NcoI and HindIII, and vector pETM-10 (see FIG. 3, kindkingift of D. Shibly, EMBL Heidelberg , Obtained from Heidelberg, Germany).
- SPA-His-C which is an immunoglobulin binding protein having a histag (a peptide consisting of 6 histidine residues) at the C-terminus
- the vector pET29 (see FIG. 3, see Novagen). Used).
- the restriction enzymes used in this vector pET29 were NdeI (New-England Bio Bio Lab) and Xho I (New-England Bio Bio Lab).
- All three types of expression vectors shown in FIG. 3 contain a kanamycin resistance gene as a selection marker.
- Tev represents a TEV protease recognition site (amino acid sequence: ENLYFQG). TEV protease recognizes the amino acid sequence ENLYFQG and cleaves between Q and G.
- the restriction enzyme was introduced by designing a pair of primers based on the SPAK insertion sequence. PCR amplification was performed using primers (SEQ ID NOs: 9 to 17) shown in Table 2.
- the SPA-His-N DNA fragment can also be obtained directly by digesting a plasmid containing SPAK with a restriction enzyme (Table 1).
- the DNA fragment of SPA-His-N was directly obtained by digesting a plasmid containing SPAK with a restriction enzyme (Table 1).
- PCR amplification solution containing 0.5 ⁇ l of Straphylococcus aureus genomic DNA template (500 ng / ⁇ l), 5 pl of each primer, 5 ⁇ l of 10 ⁇ Pfu buffer (manufactured by Fermentas), and 1 ⁇ l of Pfu polymerase (manufactured by Fermentas) (5 units / ⁇ l) Sterile water was added to bring the final volume to 50 ⁇ l.
- the conditions for PCR amplification are as follows: 94 ° C for 1 minute, then 94 ° C for 30 seconds, 56 ° C for 1 minute, 72 ° C for 1 minute 30 cycles, and finally 72 ° C for 10 minutes.
- This PCR reaction was carried out with a PX2 Thermal Cycler PCR device (manufactured by Thermo-Electron Corporation).
- Recombinant immunoglobulin binding protein is obtained from E. coli.
- E. coli BL21 strain cells (manufactured by STRATAGENE)
- 1 mM IPTG manufactured by Sigma-Aldrich
- the cells were incubated at 37 ° C. until the absorbance (OD600) reached approximately 0.6.
- the cells were collected and disrupted in Tris buffer at pH 8.0.
- the obtained recombinant immunoglobulin binding protein was purified by Ni affinity chromatography (Ni-NTA (nitrilotriacetic acid) particles, manufactured by Qiagen).
- Ni-NTA nitrilotriacetic acid
- the purified immunoglobulin binding protein was further purified in an HEPES buffer at pH 7.5 by anion exchange chromatography (Q-Sepharose FF, manufactured by GE Bioscience).
- PB Porous particles
- SPAK glycidyl methacrylate / trimethylolpropane trimethacrylate copolymer
- the average particle size of PB was 33 ⁇ m and the specific surface area was 83 m 2 / g.
- SPAK digested with TEV protease was passed through a Ni-NAT column (volume: 4 mL) in 50 mM Tris-HCl, 0.5 mM EDTA, and 1 mM DTT buffer (pH 8.0) to cleave the his tag site of SPAK. Crude SPAKwoHis was recovered. This crude SPAKwoHis was dialyzed for 12 hours in 10 mM HEPES buffer (pH 7.5) to prepare SPAKwoHis for particle binding experiments.
- the amino acid sequence of SPAKwoHis is as follows.
- SPAKwohis total amino acid sequence (SEQ ID NO: 18) GAMAKADAQQNNFNKDQQSAFYEILNMPNLNEAQRNGFIQSLKDDPSQSTNVLGEAKKLNESQAPKADNNFNKEQQNAFYEILNMPNLNEEQRNGFIQSLKDDPSQSANLLSEAKKLNESQAPKADNKFNKEGSK
- SPAKwoHis-bound porous particles SPAKwoHis-PB
- SPAKwoHis-PB SPAKwoHis-bound porous particles
- Immobilization example 3 380 mg of SPATK-bound porous particles (SPATK-PB) were obtained in the same manner as in Immobilization Example 1 except that SPATK was used instead of SPAK in Immobilization Example 1. The amount of SPATK bound to the particles was 36 mg / g particles.
- Test example (measurement of binding amount of immunoglobulin G (IgG)) 2.2.3.1. Measurement example 1 Using SPAK-PB, 2.1.3.1. When the binding capacity of the human IgG antibody of SPAK-PB was determined by the method described in the column of measurement method 1, it was 30 mg / mL.
- the obtained aqueous solution was put into a 7 L separable flask, a thermometer, a stirring blade, and a cooling tube were attached, set in a hot water bath, and stirring was started at 825 rpm in a nitrogen atmosphere. Subsequently, the separable flask was heated with a hot water bath, and when the temperature of the aqueous solution reached 85 ° C., the organic monomer solution was added to the aqueous solution using a dropping funnel, and the mixture was stirred for 5 hours.
- the reaction solution was transferred to a 5 L polypropylene bottle and allowed to stand until the particles floated, and excess water was sucked out from below and discarded. Further, acetone was added to the reaction solution to precipitate the particles. Next, the reaction solution was allowed to stand for 3 minutes, and acetone was removed by decantation. After repeating this operation twice, water was added to settle the particles. Furthermore, it was left still for 3 minutes and decanted. This operation was repeated twice to wash the particles. Further, the particle dispersion was replaced with acetone again and air-dried overnight, followed by drying in a vacuum drier to obtain porous mother particles 1 (86 g).
- Ligand 1 Preparation of Ligand SPAK prepared in Synthesis Example 1 is hereinafter referred to as Ligand 1.
- the particle diameter of the packing material 1 for affinity chromatography is 43 ⁇ m, the specific surface area is 64 m 2 / g, the volume average pore diameter is 235 nm, the pore diameter mode is 130 nm, and the volume average pore diameter / pore diameter mode value.
- the binding capacity (calculated by the method described in the column of 2.1.3.2. Measurement method 2) was 26 mg / mL at a linear flow rate of 150 cm / hr, 23 mg / mL at 500 cm / hr, and 22 mg / mL at 1000 cm / hr. mL.
- Synthesis example 4 In Synthesis Example 3, the same procedure as in Synthesis Example 3 was conducted except that 115 g of diisobutyl ketone and 45 g of acetophenone were used instead of 173 g of diisobutyl ketone and 67 g of acetophenone, and the reaction vessel was changed to a separable flask with a baffle instead of a separable flask. Thus, porous mother particles were synthesized, and a ligand was bound thereto to obtain a packing material 2 for affinity chromatography.
- the particle size of the packing material 2 for affinity chromatography is 33 ⁇ m, the specific surface area is 83 m 2 / g, the volume average pore diameter is 146 nm, the pore diameter mode is 40 nm, and the volume average pore diameter / pore diameter mode is 3.7. Met.
- the binding capacity (calculated by the method described in section 2.1.3.2. Measurement method 2) was 32 mg / mL at a linear flow rate of 150 cm / hr, 20 mg / mL at 500 cm / hr, and 14 mg / mL at 1000 cm / hr. mL.
- Synthesis example 5 A filler 3 for affinity chromatography was obtained in the same manner as in Synthesis Example 3 except that (bonding of porous mother particles and ligand) in Synthesis Example 3 was changed to the following procedure.
- the particle diameter of the packing material 3 for affinity chromatography is 43 ⁇ m, the specific surface area is 64 m 2 / g, the volume average pore diameter is 235 nm, the pore diameter mode is 130 nm, and the volume average pore diameter / pore diameter mode is Was 1.8.
- the binding capacity (calculated by the method described in 2.1.3.2. Measurement method 2) was 25 mg / mL at a linear flow rate of 150 cm / hr, 21 mg / mL at 500 cm / hr, and 20 mg / mL at 1000 cm / hr. there were.
- Synthesis Example 6 Porous mother particles were synthesized in the same manner as in Synthetic Example 3 except that cumene 140 g and acetophenone 20 g were used instead of 173 g of diisobutyl ketone and 67 g of acetophenone in Synthesis Example 3, and a ligand was bound to the porous mother particles. Thus, a filler 4 for affinity chromatography was obtained.
- the particle size of the packing material 4 for affinity chromatography is 39 ⁇ m, the specific surface area is 91 m 2 / g, the volume average pore diameter is 128 nm, the pore diameter mode is 33 nm, and the volume average pore diameter / pore diameter mode is 3.9. Met.
- the binding capacity (calculated by the method described in the column of 2.1.3.2. Measurement method 2) is 19 mg / mL at a linear flow rate of 150 cm / hr, 8 mg / mL at a linear flow rate of 500 cm / hr, and 1000 cm / hr. It was 6 mg / mL.
- Synthesis example 7 Synthesis Example 3 except that 15 g of trimethylolpropane trimethacrylate and 25 g of ethylene glycol dimethacrylate were used instead of 40 g of trimethylolpropane trimethacrylate, and 115 g of diisobutylketone and 45 g of acetophenone were used instead of 173 g of diisobutylketone and 67 g of acetophenone.
- porous mother particles were synthesized, and a ligand was bound to the porous mother particles to obtain a packing material 5 for affinity chromatography.
- the particle size of the packing material 5 for affinity chromatography is 32 ⁇ m, the specific surface area is 38 m 2 / g, the volume average pore diameter is 329 nm, the pore diameter mode is 302 nm, and the volume average pore diameter / pore diameter mode is 1.1. Met.
- the binding capacity (calculated by the method described in the column of 2.1.3.2. Measurement method 2) is 10 mg / mL at a linear flow rate of 150 cm / hr, 9 mg / mL at a linear flow rate of 500 cm / hr, and 1000 cm / hr. It was 8 mg / mL.
- Synthesis example 8 A filler 6 for affinity chromatography was obtained in the same manner as in Synthesis Example 3 except that SPAKwoHis was used instead of Ligand 1 in Synthesis Example 3.
- the particle size of the packing material 6 for affinity chromatography is 33 ⁇ m, the specific surface area is 83 m 2 / g, the volume average pore diameter is 146 nm, the pore diameter mode is 40 nm, and the volume average pore diameter / pore diameter mode is 3.7. Met.
- the binding capacity (calculated by the method described in section 2.1.3.2. Measurement method 2) was 8 mg / mL at a linear flow rate of 150 cm / hr, 5 mg / mL at 500 cm / hr, and 4 mg / mL at 1000 cm / hr. mL.
- Comparative Synthesis Example 1 A filler for affinity chromatography (trade name “MabSelect Xtra”, manufactured by GE Healthcare Biosciences) in which protein A was immobilized on crosslinked agarose not using vinyl monomer as a raw material was evaluated.
- the binding capacity (calculated by the method described in the column of 2.1.3.2. Measurement method 2) was 25 mg / mL at a linear flow rate of 150 cm / hr and 12 mg / mL at 500 cm / hr. Although the linear flow rate was attempted to be 1000 cm / hr, the column pressure was high and the linear flow rate did not reach 1000 cm / hr.
- the present invention is not limited to the above-described embodiments, and various modifications can be made.
- the present invention also includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same purposes and results).
- the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced.
- the present invention includes a configuration that achieves the same effect as the configuration described in the embodiment or a configuration that can achieve the same object.
- the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.
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Abstract
Description
架橋性ビニル単量体およびエポキシ基含有ビニル単量体を含む単量体混合物の共重合体を含有する多孔性母粒子であって、
前記多孔性母粒子にリガンドが結合しており、
前記多孔性母粒子は、該多孔性母粒子に含まれるエポキシ基を開環させて得られる開環エポキシ基を有する。
(式中、Rは4~20個のヒスチジンが連続した部位を含む4~300個のアミノ酸からなるアミノ酸配列を示し、R2はプロテインAのイムノグロブリン結合ドメインを少なくとも1個含む50~500個のアミノ酸からなるアミノ酸配列を示す(ここで、R2がRに結合する末端はイムノグロブリン結合ドメインの末端である。)。)
(式中、R1は4~20個のヒスチジンが連続した部位を含む4~100個のアミノ酸からなるアミノ酸配列を示し(ここで、R1において、前記ヒスチジンが連続した部位の末端がrと結合する。)、rはTEVドメインを含む7~200個のアミノ酸からなる任意のアミノ酸配列を示す。)
(式中、Rは4~20個のヒスチジンが連続した部位を含む4~300個のアミノ酸からなるアミノ酸配列を示し、R2はプロテインAのイムノグロブリン結合ドメインを少なくとも1個含む50~500個のアミノ酸からなるアミノ酸配列を示す(ここで、R2がRに結合する末端はイムノグロブリン結合ドメインの末端である。)。)
(式中、R1は4~20個のヒスチジンが連続した部位を含む4~100個のアミノ酸からなるアミノ酸配列を示し(ここで、R1において、前記ヒスチジンが連続した部位の末端がrと結合する。)、rはTEVドメインを含む7~200個のアミノ酸からなる任意のアミノ酸配列を示す。)
1.1.多孔性母粒子
1.1.1.構成
本実施形態に係るアフィニティークロマトグラフィー用充填剤(多孔性母粒子)は、架橋性ビニル単量体およびエポキシ基含有ビニル単量体を含む単量体混合物の共重合体から主に構成されるのが好ましい。
本実施形態に係るアフィニティークロマトグラフィー用充填剤として使用される多孔性母粒子は、例えば公知のシード重合、懸濁重合などにより製造することができる。シード重合法として、特公昭57-24369号公報記載の二段膨潤重合法も好適に用いられる。重合に際しては、上記単量体の他、水、ポロジェンを必須成分とし、重合開始剤、高分子分散剤、界面活性剤、塩、シード粒子などを必要に応じて使用する。
本実施形態に係るアフィニティークロマトグラフィー用充填剤には、リガンドが結合している。
リガンドとしては、標的物に対してアフィニティーを有するものであれば、その種類は特に限定されないが、例えば、プロテインA、プロテインG、アビジン等のタンパク質;インシュリン等のペプチド;モノクロナール抗体等の抗体;酵素;ホルモン;DNA;RNA;ヘパリン、ルイスX、ガングリオシド等の糖質;イミノジ酢酸、合成色素、2-アミノフェニル硼素酸、4-アミノベンズアミジン、グルタチオン、ビオチンやその誘導体のような低分子化合物を用いることができる。上記に例示したリガンドはその全体を用いてもよいが、リコンビナント、酵素処理等によって得られるそのフラグメントを用いてもよい。また、人工的に合成されたペプチドやペプチド誘導体であってもよい。
好ましいリガンドの一例であるイムノグロブリン結合タンパク質(以下、「タンパク質1」ともいう。)は、下記一般式(1)で表される。
(式中、Rは4~20個のヒスチジンが連続した部位を含む4~300個のアミノ酸からなるアミノ酸配列を示し、R2はプロテインAのイムノグロブリン結合ドメインを少なくとも1個含む50~500個のアミノ酸からなるアミノ酸配列を示す(ここで、R2がRに結合する末端はイムノグロブリン結合ドメインの末端である。)。)
(式中、R1は4~20個のヒスチジンが連続した部位を含む4~100個のアミノ酸からなるアミノ酸配列を示し(ここで、R1において、前記ヒスチジンが連続した部位の末端がrと結合する。)、rはTEVドメインを含む7~200個のアミノ酸からなる任意のアミノ酸配列を示す。)
(式中、Rは4~20個のヒスチジンが連続した部位を含む4~300個のアミノ酸からなるアミノ酸配列を示し、R2はプロテインAのイムノグロブリン結合ドメインを少なくとも1個含む50~500個のアミノ酸からなるアミノ酸配列を示す(ここで、R2がRに結合する末端はイムノグロブリン結合ドメインの末端である。)。)
(式中、R1は4~20個の連続したヒスチジンを含む4~100個のアミノ酸からなるアミノ酸配列を示し(ここで、R1において、前記ヒスチジンが連続した部位の末端がrと結合する。)、rはTEVドメインを含む7~200個のアミノ酸からなる任意のアミノ酸配列を示す。)
プロテインAのイムノグロブリン結合ドメインは、Aドメイン、Bドメイン、Cドメイン、Dドメイン、およびEドメイン、およびZドメインから選ばれる少なくとも1種であることが好ましい。Aドメイン、Bドメイン、Cドメイン、Dドメイン、およびEドメインのドメインのアミノ酸配列は例えば、Moks T, Abrahms L, et al.,Staphylococcal protein A consists of five IgG-binding domains, Eur J Biochem. 1986, 156, 637-643のFig.1に記載されている。該文献はこの参照により開示に含まれる。また、上記文献に記載された各ドメインのアミノ酸配列と70%以上(好ましくは90%以上)の相同性を有するアミノ酸配列からなるタンパク質も、本発明におけるプロテインAのイムノグロブリン結合ドメインとして使用することができる。
本発明のタンパク質1または2を製造するための標準技術としては、例えば、Frederick M. AusbelらによるCur rent Protocols In Molecular BiologyやSambrookら編集のMolecular Cloning (Cold Spring Harbor Laboratory Press, 3rd edition, 2001)などに記載されている公知の遺伝子組換え技術を利用することができる。例えば、本発明のタンパク質1または2は、米国特許第5,151,350号明細書に記載されている遺伝子組換え技術を用いて製造することができる。すなわち、目的の改変タンパク質(タンパク質1または2)をコードする核酸配列を含有させた発現ベクターを大腸菌などの宿主に形質転換し、当該細胞を適切な液体培地で培養することにより、培養後の細胞から、本発明のタンパク質1または2を大量かつ経済的に取得することができる。好ましい発現ベクターとしては、細菌内で複製可能な既知のベクターのいずれをも用いることができ、例えば、米国特許第5,151,350号明細書に記載されているプラスミドや、Sambrookら編集のMolecular Cloning (Cold Spring Harbor Laboratory Press, 3rd edition, 2001)などに記載されているプラスミドが挙げられる。また、細菌中に核酸を導入することにより細菌を形質転換させるためには、当該技術分野において知られるいずれの方法を用いてもよく、例えば、Sambrookら編集のMolecular Cloning (Cold Spring Harbor Laboratory Press, 3rd edition, 2001)などに記載されている公知の方法を利用することができる。形質転換した細菌を培養して、発現されたタンパク質を回収する方法は、当業者によく知られている。
本発明のタンパク質1または2をリガンドとして用いた充填剤は、アフィニティークロマトグラフィーにおいて、従来の充填剤と比較してイムノグロブリン結合タンパク質の保持量が多く、かつ、当該タンパク質の保持能に優れている。これにより、目的タンパク質の捕捉量を高めることができるため、目的タンパク質(抗体)の結合容量を増大させることができる。その結果、純度の高い目的タンパク質を効率良く、低コストでかつ大量に精製することができる。
以下、本実施形態にかかるアフィニティークロマトグラフィー用充填剤を、実施例を挙げてさらに具体的に説明する。また、以下の記載は本発明の態様を概括的に示すものであり、特に理由なく、かかる記載により本発明は限定されるものではない。
2.1.1.粒径
レーザ回折散乱式粒度分布測定装置(ベックマン・コールター社製 LS13320)により、粒子の体積平均粒径を測定した。
後述する合成例4~8および比較合成例1でそれぞれ調製された、アフィニティークロマトグラフィー用充填剤を40℃で24時間真空乾燥させて乾燥粒子を得、水銀ポロシメーター(島津製作所社製 オートポアIV9520)にて乾燥粒子の比表面積、体積平均細孔径、および細孔径最頻値を求めた。測定範囲は細孔径範囲で10~5000nmとした。
2.1.3.1.測定法1
GEヘルスケアバイオサイエンス社製AKTAprime plusを用いて、線流速150cm/hrおよび500cm/hr、1000cm/hrにおけるヒトIgG抗体の結合容量を測定した。カラム容量は1mL、ヒトIgG抗体(ランパイアバイオロジカルラボラトリーズ(Lampire Biological Laboratories)社製)は25mMクエン酸緩衝液(pH6.0)で1mg/mLに希釈したものを使用し、吸光度モニターで溶出先端濃度5w/v%ブレークスルー(破過)のときのヒトIgG抗体吸着量と充填剤体積から結合容量を求めた。
内径0.5cm、高さ5cmのカラムにて、GEヘルスケアバイオサイエンス社製AKTAprime plusを用いて、線流速300cm/hrにおけるヒトIgG抗体の結合容量を測定した。ヒトIgG抗体(ランパイアバイオロジカルラボラトリーズ(Lampire Biological Laboratories)社製)は25mMクエン酸緩衝液(pH6.0)で1mg/mLに希釈したものを使用し、吸光度モニターで溶出先端濃度10w/v%ブレークスルーのときのヒトIgG抗体吸着量と充填剤体積から結合容量を求めた。
2.2.1.合成例1(イムノグロブリン結合タンパク質の調製)
後述する調製例1~4により、図1および図2に示されるアミノ酸配列を有するイムノグロブリン結合タンパク質(SPAK(配列番号1)、SPAC(配列番号2)、SPAKK(配列番号3)、SPATK(配列番号4)、SPA2K(配列番号5)、SPA3K(配列番号6)、SPA-His-C(配列番号7)、SPA-His-N(配列番号8))を調製した。
Straphylococcus aureus(ATCC, 10832)由来のプロテインA(Dドメイン+Aドメイン)のcDNAをPCRによって増幅した。プライマー(表2参照)は、後述するサブクローニングを補助するために対応する制限酵素部位を有するように設計された。
制限酵素で消化されたDNAフラグメントのライゲーションは、T4DNAリガーゼ(New England Biolab製)100-200ユニット/mlおよび5×リガーゼ緩衝液(ニューイングランドバイオラボ(New England Biolab)社製)を用いて12℃で12-16時間行われた。プラスミドの形質転換のために、E.coliDH5-α株細胞(New England Biolab製)を使用した。
陽性コロニーを選択し、ミニプレップキット(Mini Prep Kit)(キアゲン(Qiagen)社製)によってプラスミドDNAを抽出した。このプラスミドDNAについて、挿入されたDNAフラグメントが正しい配列であるかどうかを確認するために、3730 NDA Sequencer(Applied Biosystems製)で配列解析を行った。
組み換え型イムノグロブリン結合タンパク質を、E.coli(BL21株)細胞(STRATAGENE製)内にて18℃で1mMのIPTG(Sigma-Aldrich製)を添加し、15時間発現させた。誘導に先立って、吸光度(OD600)が約0.6に到達するまで上記細胞を37℃でインキュベートした。タンパク質発現後、細胞を回収し、pH8.0のトリス緩衝液中で破砕した。
2.2.2.1.固定化例1
グリシジルメタクリレート・トリメチロールプロパントリメタクリレート共重合体からなる多孔質粒子(以下、PBと記す。)を懸濁重合により作製した。PBの平均粒径は33μm、比表面積は83m2/gであった。400mgのPB、36mgのSPAKが16mLのホウ酸緩衝液(pH8.5)に分散した混合液を調製し、4℃で24時間転倒混和し、SPAKをPBに結合させた。次いで、10%メルカプトエタノール水溶液0.8mLを添加して4℃で6時間転倒混和し、残余のエポキシ基を開環、ブロッキングし、20%エタノール水溶液で洗浄して、380mgのSPAK結合多孔質粒子(SPAK-PB)を得た。Thermo Scientific Pierce BCA Protein Assay kitで定量測定を行ったところ、前記粒子に結合したSPAKの量は29mg/g粒子であった。
50mM トリス塩酸、0.5mM EDTA、および1mM DTTのバーファー(pH8.0)中、TEVプロテアーゼで消化されたSPAKをNi-NATカラム(容量:4mL)に通過させて、SPAKのヒスタグ部位が切断された粗SPAKwoHisを回収した。この粗SPAKwoHisを10mM HEPESバーファー(pH7.5)中で12時間透析して、粒子への結合実験用SPAKwoHisを調製した。SPAKwoHisのアミノ酸配列は以下の通りである。
SPAKwohis(全アミノ酸配列)(配列番号18)
GAMAKADAQQNNFNKDQQSAFYEILNMPNLNEAQRNGFIQSLKDDPSQSTNVLGEAKKLNESQAPKADNNFNKEQQNAFYEILNMPNLNEEQRNGFIQSLKDDPSQSANLLSEAKKLNESQAPKADNKFNKEGSK
上記固定化例1で、SPAKの代わりにSPATKを使用した以外は、上記固定化例1と同様にして、380mgのSPATK結合多孔質粒子(SPATK-PB)を得た。前記粒子に結合したSPATKの量は36mg/g粒子であった。
2.2.3.1.測定例1
SPAK-PBを用いて、2.1.3.1.測定法1の欄に記載された方法にて、SPAK-PBのヒトIgG抗体の結合容量を求めたところ、30mg/mLであった。
上記測定法1で、SPAK-PBの代わりにSPATK-PBを使用した以外は、上記測定法1と同様にして、SPATK-PBのヒトIgG抗体の結合容量(2.1.3.1.測定法1の欄に記載された方法で算出)を求めたところ、35mg/mLであった。
上記測定法1で、SPAK-PBの代わりにSPAKwoHis-PBを使用した以外は、上記測定法1と同様にして、SPAKwoHis-PBのヒトIgG抗体の結合容量(2.1.3.1.測定法1の欄に記載された方法で算出)を求めたところ、6mg/mLであった。
(i)多孔性母粒子の合成 グリシジルメタクリレート(三菱レーヨン社製)60gおよびトリメチロールプロパントリメタクリレート(サートマー社製)40gをジイソブチルケトン(三井化学社製)173gおよびアセトフェノン(和光純薬工業社製)67gに溶解させ、2、2’-アゾイソブチロニトリル(和光純薬工業社製)1gを添加し、有機モノマー溶液を調製した。
上記合成例1で調製されたSPAKを、以下リガンド1とする。
350mgの多孔性母粒子1と、32mgのリガンド1とが18mLのホウ酸緩衝液(pH8.5)に分散した混合液を調製し、4℃で20時間転倒混和し、リガンド1を多孔性母粒子1に結合させた。次いで、0.5mol/Lメルカプトエタノールと0.5mol/L塩化ナトリウムとからなる水溶液20mLで2回洗浄した後、0.5mol/Lメルカプトエタノールと0.5mol/L塩化ナトリウムとからなるpH8.5の緩衝液20mL中、室温で4時間転倒混和し、残余のエポキシ基を開環、ブロッキングした。20%エタノール水溶液で洗浄して、320mgのアフィニティークロマトグラフィー用充填剤1を得た。
アフィニティークロマトグラフィー用充填剤1の粒径は43μm、比表面積は64m2/g、体積平均細孔径は235nm、細孔径最頻値は130nm、体積平均細孔径/細孔径最頻値は1.8であった。結合容量(2.1.3.2.測定法2の欄に記載された方法で算出)は、線流速150cm/hrにおいて26mg/mL、500cm/hrにおいて23mg/mL、1000cm/hrにおいて22mg/mLであった。
合成例3で、ジイソブチルケトン173gおよびアセトフェノン67gの代わりにジイソブチルケトン115gおよびアセトフェノン45gを使用し、反応容器をセパラブルフラスコの代わりにバッフル付きセパラブルフラスコに変更した以外は、合成例3と同様にして、多孔性母粒子を合成、リガンドを結合して、アフィニティークロマトグラフィー用充填剤2を得た。
合成例3における(多孔性母粒子とリガンドとの結合)を以下の手順に変更した以外は、合成例3と同様にして、アフィニティークロマトグラフィー用充填剤3を得た。
10gの多孔性母粒子1を250mLポリ瓶にいれて、純水80gに分散させ、0.1M硫酸を10g添加した。この液を60℃で5時間転倒混和することにより、多孔性母粒子1のエポキシ基を開環した。次いで、桐山ロートでろ過した後、純水とアセトニトリルで洗浄し、アセトニトリル200gに分散した。これに1.3gのトシルクロライド、1.3gのトリプロピルアミン、0.8gのトリメチルアミン塩酸塩を加え、室温で5時間攪拌することにより、水酸基をトシル化した。次いで、これをろ過した後、アセトニトリルと水で洗浄し、pH9.5のホウ酸緩衝液90gに分散し、10gのトシル化多孔性母粒子1の分散液を得た。400mgのトシル化多孔性母粒子1と、36mgのリガンド1とが16mLのホウ酸緩衝液に分散した混合液を調製し、37℃で20時間転倒混和し、リガンド1をトシル化多孔性母粒子1に結合させた。次いで、10%モノエタノールアミン水溶液0.8mLを添加して37℃で6時間転倒混和し、残余のトシル基をブロッキングし、20%エタノール水溶液で洗浄して、380mgのアフィニティークロマトグラフィー用充填剤3を得た。
アフィニティークロマトグラフィー用充填剤3の粒径は43μm、比表面積は64m2/g、体積平均細孔径は235nm、細孔径最頻値は130nm、体積平均細孔径/細孔径最頻値は1.8であった。結合容量(2.1.3.2.測定法2に記載された方法で算出)は、線流速150cm/hrにおいて25mg/mL、500cm/hrにおいて21mg/mL、1000cm/hrにおいて20mg/mLであった。
合成例3で、ジイソブチルケトン173gおよびアセトフェノン67gの代わりにクメン140gおよびアセトフェノン20gを使用した以外は、合成例3と同様にして、多孔性母粒子を合成し、該多孔性母粒子にリガンドを結合して、アフィニティークロマトグラフィー用充填剤4を得た。
合成例3で、トリメチロールプロパントリメタクリレート40gの代わりにトリメチロールプロパントリメタクリレート15gおよびエチレングリコールジメタクリレート25gを、ジイソブチルケトン173gおよびアセトフェノン67gの代わりにジイソブチルケトン115gおよびアセトフェノン45gを使用した以外は、合成例3と同様にして、多孔性母粒子を合成し、該多孔性母粒子にリガンドを結合して、アフィニティークロマトグラフィー用充填剤5を得た。
合成例3で、リガンド1の代わりに、SPAKwoHisを用いた以外は、合成例3と同様にしてアフィニティークロマトグラフィー用充填剤6を得た。
ビニル単量体を原料としない架橋アガロースにプロテインAを固定したアフィニティークロマトグラフィー用充填剤(商品名「MabSelect Xtra」、GEヘルスケアバイオサイエンス社製)を評価した。結合容量(2.1.3.2.測定法2の欄に記載された方法で算出)は、線流速150cm/hrにおいて25mg/mL、500cm/hrにおいて12mg/mLであった。なお、線流速を1000cm/hrにしようとしたが、カラム圧力が高く、線流速は1000cm/hrに達しなかった。
Claims (10)
- 架橋性ビニル単量体およびエポキシ基含有ビニル単量体を含む単量体混合物の共重合体を含有する多孔性母粒子であって、
前記多孔性母粒子にリガンドが結合しており、
前記多孔性母粒子は、該多孔性母粒子に含まれるエポキシ基を開環させて得られる開環エポキシ基を有する、アフィニティークロマトグラフィー用充填剤。 - 前記開環エポキシ基として置換または非置換の2,3-ジヒドロキシプロピル基を含む、請求項1に記載のアフィニティークロマトグラフィー用充填剤。
- 前記リガンドが、プロテインAのイムノグロブリン結合ドメインを含むタンパク質である、請求項1または2に記載のアフィニティークロマトグラフィー用充填剤。
- 前記プロテインAのイムノグロブリン結合ドメインが、Aドメイン、Bドメイン、Cドメイン、Dドメイン、Eドメイン、およびZドメインから選ばれる少なくとも1種である、請求項3に記載のアフィニティークロマトグラフィー用充填剤。
- 前記リガンドが、下記一般式(1)で表されるイムノグロブリン結合タンパク質である、請求項1ないし4のいずれか1項に記載のアフィニティークロマトグラフィー用充填剤。
R-R2 ・・・・・(1)
(式中、Rは4~20個のヒスチジンが連続した部位を含む4~300個のアミノ酸からなるアミノ酸配列を示し、R2はプロテインAのイムノグロブリン結合ドメインを少なくとも1個含む50~500個のアミノ酸からなるアミノ酸配列を示す(ここで、R2がRに結合する末端はイムノグロブリン結合ドメインの末端である。)。) - 上記一般式(1)において、R-は下記一般式(2)で表される基である、請求項5に記載のアフィニティークロマトグラフィー用充填剤。
R1-r- ・・・・・(2)
(式中、R1は4~20個のヒスチジンが連続した部位を含む4~100個のアミノ酸からなるアミノ酸配列を示し(ここで、R1において、前記ヒスチジンが連続した部位の末端がrと結合する。)、rはTEVドメインを含む7~200個のアミノ酸からなる任意のアミノ酸配列を示す。) - 前記リガンドは、上記一般式(1)において、Rで表されるアミノ酸配列およびR2で表されるアミノ酸配列のうち少なくとも一方が、リジン、アルギニン、およびシステインから選ばれる1種のアミノ酸を含む1~50個のアミノ酸からなるドメインtを含むものである、請求項5または6に記載のアフィニティークロマトグラフィー用充填剤。
- 前記リガンドが、下記一般式(3)で表されるイムノグロブリン結合タンパク質である、請求項1ないし4のいずれか1項に記載のアフィニティークロマトグラフィー用充填剤。
R2-R ・・・・・(3)
(式中、Rは4~20個のヒスチジンが連続した部位を含む4~300個のアミノ酸からなるアミノ酸配列を示し、R2はプロテインAのイムノグロブリン結合ドメインを少なくとも1個含む50~500個のアミノ酸からなるアミノ酸配列を示す(ここで、R2がRに結合する末端はイムノグロブリン結合ドメインの末端である。)。) - 上記一般式(3)において、-Rは下記一般式(4)で表される基である、請求項8に記載のアフィニティークロマトグラフィー用充填剤。
-r-R1 ・・・・・(4)
(式中、R1は4~20個のヒスチジンが連続した部位を含む4~100個のアミノ酸からなるアミノ酸配列を示し(ここで、R1において、前記ヒスチジンが連続した部位の末端がrと結合する。)、rはTEVドメインを含む7~200個のアミノ酸からなる任意のアミノ酸配列を示す。) - 前記リガンドは、上記一般式(3)において、Rで表されるアミノ酸配列およびR2で表されるアミノ酸配列のうち少なくとも一方が、リジン、アルギニン、およびシステインから選ばれる1種のアミノ酸を含む1~50個のアミノ酸からなるドメインtを含むものである、請求項8または9に記載のアフィニティークロマトグラフィー用充填剤。
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EP2574631A1 (en) * | 2010-03-24 | 2013-04-03 | JSR Corporation | Filler for affinity chromatography and method for isolating immunoglobulin |
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US9051355B2 (en) | 2010-03-24 | 2015-06-09 | Jsr Corporation | Filler for affinity chromatography and method for isolating immunoglobulin |
JP2012018135A (ja) * | 2010-07-09 | 2012-01-26 | Mitsubishi Chemicals Corp | 分離剤 |
WO2013133258A1 (ja) * | 2012-03-06 | 2013-09-12 | Jsr株式会社 | 抗体精製方法および抗体精製用の担体 |
JP2015520667A (ja) * | 2012-04-23 | 2015-07-23 | メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツングMerck Patent Gesellschaft mit beschraenkter Haftung | クロマトグラフィー法 |
JPWO2015199196A1 (ja) * | 2014-06-27 | 2017-04-20 | Jsr株式会社 | アフィニティークロマトグラフィー用担体 |
JP2017125799A (ja) * | 2016-01-15 | 2017-07-20 | 日立化成株式会社 | 分離材及びカラム |
Also Published As
Publication number | Publication date |
---|---|
US20110262748A1 (en) | 2011-10-27 |
EP2339339A1 (en) | 2011-06-29 |
US8846877B2 (en) | 2014-09-30 |
JP5626526B2 (ja) | 2014-11-19 |
EP2339339A4 (en) | 2016-10-12 |
CN102165312A (zh) | 2011-08-24 |
JPWO2010035757A1 (ja) | 2012-02-23 |
CN102165312B (zh) | 2015-04-22 |
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