Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K38/00—Medicinal preparations containing peptides
  • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
  • A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
  • A61K38/19—Cytokines; Lymphokines; Interferons
  • A61K38/21—Interferons [IFN]
  • A61K38/212—IFN-alpha
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal 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
  • A61K47/51—Medicinal 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
  • A61K47/56—Medicinal 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
  • A61K47/59—Medicinal 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
  • A61K47/60—Medicinal 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/14—Antivirals for RNA viruses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/20—Antivirals for DNA viruses
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P7/00—Drugs for disorders of the blood or the extracellular fluid
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
  • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
  • C07K14/52—Cytokines; Lymphokines; Interferons
  • C07K14/555—Interferons [IFN]
  • C07K14/56—IFN-alpha

Definitions

• a polymer e.g., polyethylene glycol (PEG)
• PEG polyethylene glycol
• An aspect of this invention relates to use a protein-polymer conjugate to treat various diseases.
• the conjugate contains at least one polymer moiety, an interferon-a moiety, and a linker.
• the total molecular weight is 2-200 kD
• the number of polymer moieties in the conjugate is not more than 10.
• the polymer moiety or moieties are attached to the linker; the nitrogen atom of the N-terminus of the interferon-a moiety is bonded to the linker; and the linker is a covalent bond, C 1-10 alkylene, C 2-10 alkenylene, or C 2-10 alkynylene.
• the conjugate is substantially pure, e.g., having a purity of more than 70%, 80%, or 90%>.
• the diseases that can be treated by the conjugate include multiple sclerosis, chronic viral infection (such as hepatitis B virus infection, hepatitis C virus infection, and human papilloma virus infection), cancer, idiopathic myelofibrosis, polycythaemia vera, and essential thromobocythaemia.
• chronic viral infection such as hepatitis B virus infection, hepatitis C virus infection, and human papilloma virus infection
• cancer idiopathic myelofibrosis
• polycythaemia vera a protein-polymer conjugate of formula I shown below to treat the above-mentioned diseases:
• each of Ri, R 2 , R3, R4, and R 5 independently, is H, Ci_ 5 alkyl, C 2 -5 alkenyl, C 2 -5 alkynyl, aryl, heteraryl, C 3 -8 cycloalkyl, or C 3 -8 heterocycloalkyl; each of Ai and A 2 , independently, is a polymer moiety; each of G l s G 2 , and G 3 , independently, is a bond or a linking functional group; P is an interferon-a moiety; m is 0 or an integer of 1-10; and n is an integer of 1-10.
• the protein-polymer conjugate may have one or more of the following features: G 3 is a bond and P is an interferon-a moiety in which the amino group at the N-terminus is attached to G 3 ; Ai and A 2 are
• polyalkylene oxide moieties having a molecular weight of 2-100 kD (preferably 10-30 which O is attached to Ai or A 2 , and NH is attached to a carbon atom as shown in formula I), or each of Gi and G 2 is urea, sulfonamide, or amide, (in which N is attached to a carbon atom as shown in formula I); m is 4, n is 2, and each of R ls R 2 , R 3 , R 4 , and R 5 is H; and P is a modified interferon- ⁇ moiety containing 1-4 additional amino acid residues.
• alkylene refers to a bi-valent straight-chained or branched hydrocarbon radical.
• aryl refers to a hydrocarbon ring system (mono-cyclic or bi-cyclic) having at least one aromatic ring. Examples of aryl moieties include, but are not limited to, phenyl, naphthyl, and pyrenyl.
• heteroaryl refers to a hydrocarbon ring system (mono-cyclic or bi- cyclic) having at least one aromatic ring which contains at least one heteroatom such as O, N, or S as part of the ring system and the reminder being carbon.
• heteroaryl moieties include, but are not limited to, furyl, pyrrolyl, thienyl, oxazolyl, imidazolyl, thiazolyl, pyridinyl, pyrimidinyl, quinazolinyl, and indolyl.
• cycloalkyl refers to a partially or fully saturated mono-cyclic or bi- cyclic ring system having only carbon ring atoms. Examples include, but are not limited to, cyclopropanyl, cyclopentanyl, and cyclohexanyl.
• heterocycloalkyl refers to a partially or fully saturated monocyclic or bi-cyclic ring system having, in addition to carbon, one or more heteroatoms (e.g., O, N, or S), as ring atoms.
• heteroatoms e.g., O, N, or S
• examples include, but are not limited to, piperidine, piperazine, morpholine, thiomorpholine, and 1,4-oxazepane.
• Alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, and heterocycloalkyl mentioned herein include both substituted and unsubstituted moieties.
• substituents include Ci-Cio alkyl, C 2 -Cio alkenyl, C 2 -Cio alkynyl, C3-C8
• cycloalkyl Cs-Cg cycloalkenyl, C1-C10 alkoxy, aryl, aryloxy, heteroaryl,
• heteroaryloxy amino, C1-C10 alkylamino, Ci-C 2 o dialkylamino, arylamino, diarylamino, hydroxyamino, alkoxyamino, Cr-C 10 alkylsulfonamide,
• arylsulfonamide hydroxy, halogen, thio, C1-C10 alkylthio, arylthio, cyano, nitro, acyl, acyloxy, carboxyl, and carboxylic ester.
• polyalkylene oxide moiety refers to a mono-valent radical derived from linear, branched, or star-shaped polyalkylene oxide.
• the molecular weight of a polyalkylene oxide moiety may be 2-100 kD.
• the polyalkylene oxide moiety is either saturated or unsaturated.
• Examples of a polyalkylene oxide moiety include, but are not limited to, polyethylene oxide, polyethylene glycol, polyisopropylene oxide, polybutenylene oxide, and copolymers thereof.
• Other polymers such as dextran, polyvinyl alcohols, polyacrylamides, or carbohydrate-based polymers can also be used to replace the polyalkylene oxide moiety, as long as they are not antigenic, toxic, or eliciting immune response.
• the polyalkylene oxide moiety is either substituted or unsubstituted.
• it can be methoxy-capped polyethylene glycol (mPEG).
• interferon-a moiety refers to a mono-valent radical derived from either interferon-a.
• Interferon-a refers to a family of highly homologous species- specific proteins that inhibit viral replication and cellular proliferation and modulate immune response. See Bonnem et al, J. Biol. Response Mod., 1984, 3(6):580-598; and Finter, J. Hepatol, 1986, 3 Suppl 2:S157-160. It can be in a naturally occurring or a modified form.
• the modified interferon- ⁇ can be, e.g., a protein containing interferon- ⁇ and 1-4 additional amino acid residues at the N-terminus of the
• interferon An example of such a modified interferon is , IFN representing an interferon-a2b moiety, the amino group at the N-terminus of which is bonded to the carbony 1 group .
• interferon- ⁇ proteins are commercially available, including Intron-A interferon provided by Schering Corporation, Kenilworth, N.J., Roferon interferon provided by Hoffmann-La Roche, Nutley, N.J., Berofor alpha 2 interferon provided by Boehringer Ingelheim Pharmaceutical, Inc., Ridgefield, Conn.,
• the interferon-a protein used for making the conjugate of this invention has an amino acid sequence at least 80% (e.g., 85%, 90%>, 95%, or 99%) identical to one of the above listed amino acid sequences, or to the fragment thereof that corresponds to a mature interferon alpha.
• Gapped BLAST can be utilized as described in Altschul et al., Nucleic Acids Res. 25(17):3389-3402, 1997.
• the default parameters of the respective programs e.g., XBLAST and NBLAST.
• linking functional group refers to a bi-valent functional group, one end being connected to the polymer moiety and the other end being connected to the protein moiety. Examples include, but are not limited to, -0-, -S-, carboxylic ester, carbonyl, carbonate, amide, carbamate, urea, sulfonyl, sulfmyl, amino, imino, hydroxyamino, phosphonate, or phosphate group.
• the protein-polymer conjugate described above can be in the free form or in the form of salt, if applicable.
• a salt for example, can be formed between an anion and a positively charged group (e.g., amino) on a protein-polymer conjugate of this invention. Suitable anions include chloride, bromide, iodide, sulfate, nitrate, phosphate, citrate, methanesulfonate, trifluoroacetate, and acetate.
• a salt can also be formed between a cation and a negatively charged group (e.g.,
• Suitable cations include sodium ion, potassium ion, magnesium ion, calcium ion, and an ammonium cation such as tetramethylammonium ion.
• protein-polymer conjugate may have one or more double bonds, or one or more asymmetric centers.
• Such a conjugate can occur as racemates, racemic mixtures, single enantiomers, individual diastereomers, diastereomeric mixtures, and cis- or trans- or E- or Z- double bond isomeric forms.
• mPEG has a molecular weight of 20 kD and IFN is an interferon-a,2b moiety.
• conjugate for the manufacture of a medicament for treating one of the above-mentioned disorders.
• Protein-polymer conjugates used to practice the present invention can be prepared by synthetic methods well known in the chemical art, e.g., the methods described in U.S. Serial No. 12/192,485.
• Scheme 1 shows an example of preparing protein-polymer conjugates of this invention.
• Diamine compound 1, which contains an acetal group is reacted with N-hydroxysuccinimidyl carbonate mPEG (i.e., compound 2) to form di-PEGylated compound 3, which is subsequently converted to aldehyde 4.
• This aldehyde compound is reacted with protein having a free amino group via reductive alkylation to afford a protein-polymer conjugate of this invention.
• a protein-polymer conjugate thus synthesized can be further purified by a method such as ion exchange chromatography, gel filtration chromatography, electrophoresis, dialysis, ultrafiltration, or ultracentrifugation.
• the chemical reactions described above include using solvents, reagents, catalysts, protecting group and deprotecting group reagents, and certain reaction conditions. They may additionally include steps, either before or after the steps described specifically herein, to add or remove suitable protecting groups in order to ultimately allow for synthesis of a protein-polymer conjugate. In addition, various synthetic steps may be performed in an alternate sequence or order to give the desired protein-polymer conjugates. Synthetic chemistry transformations and protecting group methodologies (protection and deprotection) useful in synthesizing applicable protein-polymer conjugates are known in the art and include, for example, those described in R. Larock, Comprehensive Organic Transformations, VCH Publishers (1989); T.W. Greene and P.G.M.
• the conjugate of the invention can have a very high purity. Namely, 60% or more (e.g., 70%, 80%>, or 90%>) of the conjugate molecules are identical in all aspects, including the sequence of the protein moiety and its bonding position to the polymer moiety.
• the conjugate of this invention may be pharmaceutically active in the conjugate form. Alternatively, it can release a pharmaceutically active interferon-a in vivo (e.g., through hydrolysis) by enzymatically cleaving the linkage between the protein moiety and the polymer moiety.
• enzymes involved in in vivo cleaving linkages include oxidative enzymes (e.g., peroxidases, amine oxidases, or dehydrogenases), reductive enzymes (e.g., keto reductases), and hydrolytic enzymes (e.g., proteases, esterases, sulfatases, or phosphatases).
• the conjugate of this invention can be used to treat multiple sclerosis, chronic viral infection (such as hepatitis B virus infection, hepatitis C virus infection, and human papilloma virus infection), cancer, idiopaic myelofibrosis, polycythaemia vera, and essentia thromobocythaemia. It has an unexpectedly long in vivo half life, a reduced drug dose, and/or a prolonged dosing interval.
• treating or “treatment” is defined as the application or administration of a composition including a protein-polymer conjugate to a subject (human or animal), who has a disorder, a symptom of the disorder, a disease or disorder secondary to the disorder, or a predisposition toward the disorder, with the purpose to cure, alleviate, relieve, remedy, or ameliorate the disorder, the symptom of the disorder, the disease or disorder secondary to the disorder, or the predisposition toward the disorder.
• “An effective amount” refers to an amount of a protein-polymer conjugate which confers a therapeutic effect on the treated subject.
• the therapeutic effect may be objective (i.e., measurably by some tests or markers) or subjective (i.e., a subject gives an indication of or feels an effect).
• a pharmaceutical composition contains an effective amount of at least one of the protein-polymer conjugates described above and a pharmaceutical acceptable carrier.
• this invention includes a method of administering an effective amount of one or more of the protein- polymer conjugates to a patient with one or more diseases. Effective doses will vary, as recognized by those skilled in the art, depending on, e.g., the rate of hydrolysis of a protein-polymer conjugate, the types of diseases to be treated, the route of
• a composition having one or more of the above-mentioned compounds can be administered parenterally, orally, nasally, rectally, topically, or buccally.
• parenteral refers to subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional, intraperitoneal, intratracheal or intracranial injection, as well as any suitable infusion technique.
• a sterile injectable composition can be a solution or suspension in a non-toxic parenterally acceptable diluent or solvent, such as a solution in 1,3-butanediol.
• acceptable vehicles and solvents that can be employed are mannitol, water, Ringer's solution, and isotonic sodium chloride solution.
• fixed oils are conventionally employed as a solvent or suspending medium (e.g., synthetic mono- or di-glycerides).
• Fatty acid, such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions.
• These oil solutions or suspensions can also contain a long chain alcohol diluent or dispersant, or carboxymethyl cellulose or similar dispersing agents.
• Other commonly used surfactants such as Tweens or Spans or other similar emulsifying agents or bioavailability enhancers which are commonly used in the manufacture of
• compositions can also be used for the purpose of formulation.
• a composition for oral administration can be any orally acceptable dosage form including capsules, tablets, emulsions, and aqueous suspensions, dispersions, and solutions.
• commonly used carriers include lactose and corn starch.
• Lubricating agents such as magnesium stearate, are also typically added.
• useful diluents include lactose and dried corn starch.
• a nasal aerosol or inhalation composition can be prepared according to techniques well known in the art of pharmaceutical formulation.
• such a composition can be prepared as a solution in saline, employing benzyl alcohol or other suitable preservatives, absorption promoters to enhance bioavailability, fluorocarbons, and/or other solubilizing or dispersing agents known in the art.
• a composition having one or more of the above-described compounds can also be administered in the form of suppositories for rectal administration.
• a pharmaceutically acceptable carrier is routinely used with one or more active above-mentioned compounds.
• the carrier in the pharmaceutical composition must be "acceptable” in the sense that it is compatible with the active ingredient of the composition (and preferably, capable of stabilizing the active ingredient) and not deleterious to the subject to be treated.
• One or more solubilizing agents can be utilized as pharmaceutical excipients for delivery of an above-mentioned compound. Examples of other carriers include colloidal silicon oxide, magnesium stearate, cellulose, sodium lauryl sulfate, and D&C Yellow # 10.
• Suitable assays can be used to preliminarily evaluate the efficacy of the above- described conjugates in treating various diseases. For example, one can assess the effectiveness of the conjugate in treating polycythemia vera and essential
• Di-PEG acetal (4.0 g, 0.2 mmol) was suspended in pH 2.0 buffer (critic acid, 40 mL). The reaction mixture was stirred at 35°C for 24 h and then extracted with dichloromethane (3 x 50 mL). The combined organic layers were dried over magnesium sulfate, concentrated, and then re-dissolved in dichloromethane (20 mL).
• a modified recombinant human interferon-a 2b was cloned by a PCR method using human genomic DNA as a template.
• the oligonucleotides were synthesized based on the flanking sequences of human interferon-a 2b (GenBank Accession # J00207, January 8, 2008).
• the derived PCR products were subcloned into pGEM-T vector (Promega).
• the IFN variant was PCR amplified again through the pGEM-T clones and subsequently subcloned into protein expression vector pET-24a
• Vector pET-24a was then transformed into E. coli BL21-CodonPlus (DE 3)-RIL (Stratagene) strain.
• the high-expression clones were selected by maintaining the transformed E. coli BL21-CodonPlus (DE 3)-RIL in the presence of karamycin (50 ⁇ g/mL) and chloramphenical (50 ⁇ g/mL).
• the batch fermentation used 150 mL of an overnight preculture inoculum and 3 L of the Terrific broth medium with karamycin (50 ⁇ g/mL), chloramphenical (50 ug/mL), 0.4% glycerol, and 0.5%> (v/v) trace elements (10 g/L of FeS0 4 - 7H 2 0, 2.25 g/L of ZnSCv 7H 2 0, 1 g/L of CuS0 4 - 5H 2 0, 0.5 g/L of MnSCv H 2 0, 0.3 g/L of H 3 BO 3 , 2 g/L of CaCl 2 - 2H 2 0, 0.1 g/L of (NH 4 ) 6 Mo 7 0 24 , 0.84 g/L EDTA, 50 ml/L HC1).
• the dissolved oxygen concentration was controlled at 35% and the pH was kept at 7.2 by adding a 5 N NaOH aqueous solution.
• a feeding solution containing 600 g/L of glucose and 20 g/L of MgS0 4 ⁇ 7H 2 0 was prepared. When the pH rose to a value greater than the set point, an appropriate volume of the feeding solution was added to increase the glucose concentration in the culture broth. Expression of the Pro-IFN gene was induced by adding IPTG to a final concentration of 1 mM and the culture broth was harvested after incubating for 3 hr.
• the collected cell pellet was resuspended with TEN buffer (50 mM Tris-HCl (pH 8.0), 1 mM EDTA, 100 mM NaCl) in an approximate ratio of 1 : 10 (wet weight g/mL) and disrupted by a micro fluidizer, and then centrifuged at 10,000 rpm for 20 min.
• the pellet containing inclusion body (IB) was washed twice with TEN buffer and centrifuged as described above.
• the pellet containing IB was then suspended in 150 mL of a 4 M guanidium HCl (GuHCl) aqueous solution and centrifuged at 20,000 rpm for 15 min.
• TEN buffer 50 mM Tris-HCl (pH 8.0), 1 mM EDTA, 100 mM NaCl
• the pellet containing inclusion body (IB) was washed twice with TEN buffer and centrifuged as described above.
• the pellet containing IB was then suspended in 150
• the IB was then solubilized in 50 mL of 6 M GuHCl solution.
• the GuHCl solubilized material was centrifuged at 20,000 rpm for 20 min.
• Refolding was initiated by dilution of denatured IB in 1.5 L of a freshly prepared refolding buffer (100 mM Tris-HCl (pH 8.0), 0.5 M L-Arginine, 2 mM EDTA) that was stirred only during the addition.
• the refolding reaction mixture was allowed to incubate for 48 hr without stirring.
• the refolded recombinant human interferon-a,2b (i.e., Pro-IFN) was dialyzed against 20 mM Tris buffer (with 2 mM EDTA and 0.1M urea, pH 7.0) for further purification by Q-Sepharose column chromatography.
• the refolded recombinant human protein Pro-IFN was loaded onto a Q-
• Sepharose column (GE Amersham Pharmacia, Pittsburgh, PA). The column was pre- equilibrated and washed with a 20 mM Tris-HCl buffer (pH 7.0). The product was eluted with a mixture of 20 mM Tris-HCl buffer (pH 7.0) and 200 mM NaCl.

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