US20090023895A1 - Hla-binding peptide, precursor thereof, and dna fragment and recombinant vector coding for said hla-binding peptide - Google Patents

Hla-binding peptide, precursor thereof, and dna fragment and recombinant vector coding for said hla-binding peptide Download PDF

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US20090023895A1
US20090023895A1 US12/278,348 US27834807A US2009023895A1 US 20090023895 A1 US20090023895 A1 US 20090023895A1 US 27834807 A US27834807 A US 27834807A US 2009023895 A1 US2009023895 A1 US 2009023895A1
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hla
binding
peptide
amino acid
seq
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Tomoya Miyakawa
Keiko Udaka
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Kochi University NUC
NEC Corp
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NEC Corp
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/005—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from viruses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/04—Peptides having up to 20 amino acids in a fully defined sequence; Derivatives thereof
    • A61K38/08—Peptides having 5 to 11 amino acids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/12—Viral antigens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/12—Viral antigens
    • A61K39/145—Orthomyxoviridae, e.g. influenza virus
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A61P37/04—Immunostimulants
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
    • C07K7/04—Linear peptides containing only normal peptide links
    • C07K7/06—Linear peptides containing only normal peptide links having 5 to 11 amino acids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2760/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses negative-sense
    • C12N2760/00011—Details
    • C12N2760/16011—Orthomyxoviridae
    • C12N2760/16022—New viral proteins or individual genes, new structural or functional aspects of known viral proteins or genes
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2760/00—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA ssRNA viruses negative-sense
    • C12N2760/00011—Details
    • C12N2760/16011—Orthomyxoviridae
    • C12N2760/16034—Use of virus or viral component as vaccine, e.g. live-attenuated or inactivated virus, VLP, viral protein

Definitions

  • the present invention relates to HLA-binding peptides, precursors thereof, and DNA fragments and recombinant vectors coding for the HLA-binding peptides.
  • virus elimination reaction When infection with a virus such as an influenza virus occurs, a virus elimination reaction due to natural immunity proceeds, a specific immune response is subsequently induced, and a virus elimination reaction proceeds.
  • virus in a body fluid is eliminated by a neutralizing antibody, and virus within a cell is eliminated by a cytotoxic T lymphocyte (CTL). That is, the CTL specifically recognizes a virus antigen (CTL epitope) consisting of 8 to 11 amino acids presented in an HLA class I molecule on the surface of an infected cell, and eliminates the virus by damaging the infected cell. Identifying such a virus-specific CTL epitope is therefore important for preparing preventive and therapeutic vaccines for the virus.
  • CTL epitope virus antigen
  • Patent Publication 1 states that an oligopeptide formed from a specific amino acid sequence has the property of binding to an HLA.
  • HLA-binding peptide of the above-mentioned publication has the property of binding to HLA-DQ4.
  • HLA-A2 molecule product of the HLA-A*0201 gene, HLA-A*0206 gene and the like
  • HLA-A24 molecule product of the HLA-A*2402 gene and the like
  • the present invention has been accomplished under the above-mentioned circumstances, and provides an HLA-binding peptide that has excellent properties in binding to a specific type of HLA molecule.
  • an HLA-binding peptide binding to an HLA-A type molecule the HLA-binding peptide containing one or more types of amino acid sequence selected from the group consisting of SEQ ID NOS: 1 to 52, and consisting of not less than 8 and not more than 11 amino acid residues.
  • the HLA-binding peptide wherein it contains one or more types of amino acid sequence selected from the group consisting of SEQ ID NOS: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 34, 35, 36, 37, 38, 40, 41, 43, 45, 47, 48, 49, 50, 51, and 52.
  • an HLA-binding peptide binding to an HLA-A type molecule the HLA-binding peptide containing an amino acid sequence formed by deletion, substitution, or addition of one or two amino acid residues of the amino acid sequence contained in the above-mentioned HLA-binding peptide, and consisting of not less than 8 and not more than 11 amino acid residues.
  • the construct containing an amino acid sequence formed by deletion, substitution, or addition of one or a few amino acid residues of a specific amino acid sequence that has the property of binding to an HLA-A type molecule can also exhibit a similar effect to that of the above-mentioned HLA-binding peptide.
  • a recombinant vector containing a DNA sequence coding for the above-mentioned HLA-binding peptide containing a DNA sequence coding for the above-mentioned HLA-binding peptide.
  • an HLA-binding peptide precursor changing within a mammalian body into the above-mentioned HLA-binding peptide.
  • an HLA-binding peptide that has excellent properties in binding to an HLA-A type molecule can be obtained.
  • FIG. 1 A schematic drawing for explaining an active learning experiment design used in an embodiment.
  • a peptide that contains an amino acid sequence for which the binding to an HLA molecule, predicted by a hypothesis obtained using an active learning experiment method Japanese Patent Application Laid-open No. H11-316754 (1999)
  • an active learning experiment method Japanese Patent Application Laid-open No. H11-316754 (1999)
  • a peptide that contains an amino acid sequence for which the binding to an HLA molecule, predicted by a hypothesis obtained using an active learning experiment method Japanese Patent Application Laid-open No. H11-316754 (1999)
  • is 3 or greater in terms of a -log Kd value, and consists of not less than 8 and not more than 11 amino acid residues is used as a candidate for an HLA-binding peptide. From the results of carrying out a binding experiment, it has been confirmed that these peptides are actually HLA-binding peptides.
  • HLA-binding peptides that have excellent properties in binding to an HLA-A type molecule because they contain amino acid sequence for which the binding to the HLA molecule in terms of a -log Kd value is 3 or greater could be obtained efficiently.
  • the HLA-binding peptide related to this embodiment is an HLA-binding peptide that binds to an HLA-A type molecule, contains one or more types of amino acid sequence selected from the group consisting of SEQ ID NOS: 1 to 52, which will be described later, and consists of not less than 8 and not more than 11 amino acid residues.
  • HLA-A human HLA-A types
  • about 50% of Japanese people have the HLA-A24 type.
  • All of these sequences are sequences consisting of 9 amino acid residues contained in a certain genome protein of an avian influenza virus.
  • sequences of SEQ ID NOS: 1 to 20 are given in Table 1 below.
  • sequences of SEQ ID NOS: 1 to 20 are sequences consisting of 9 amino acid residues contained in a nucleoprotein of M22344 (H7) strain, AF508607 (H9) strain, or AY676037 (H5) strain, which are 3 representative serotypes (H7, H9, H5) of an avian influenza virus, which is described later.
  • the sequences of SEQ ID NOS: 1 to 20 are sequences predicted by the above-mentioned method to be the highest in terms of binding to an HLA-A24 molecule (a product of the HLA-A*2402 gene).
  • SEQ ID NOS: 1 to 20 are arranged in decreasing binding order. That is, SEQ ID NO: 1 is the sequence that is predicted to have the best binding.
  • a predicted score for binding to the HLA-A24 molecule and binding experiment data for each sequence are expressed in the form of -log Kd values.
  • sequences of SEQ ID NOS: 21 to 36 are given in Table 2 below.
  • sequences of SEQ ID NOS: 21 to 36 are sequences consisting of 9 amino acid residues contained in a nucleoprotein of M22344 (H7) strain, AF508607 (H9) strain, or AY676037 (H5) strain, which are 3 representative serum types (H7, H9, H5) of an avian influenza virus, which is described later.
  • the sequences of SEQ ID NOS: 21 to 36 are sequences predicted by the above-mentioned method to be the highest in terms of binding to an HLA-A2 molecule (a product of the HLA-A*0201 gene).
  • SEQ ID NOS: 21 to 36 are arranged in decreasing binding order. That is, SEQ ID NO: 21 is the sequence that is predicted to have the best binding.
  • a predicted score for binding to the HLA-A2 molecule and binding experiment data for each sequence are expressed in the form of -log Kd values.
  • sequences of SEQ ID NOS: 37 to 52 are given in Table 3 below.
  • sequences of SEQ ID NOS: 37 to 52 are sequences consisting of 9 amino acid residues contained in a nucleoprotein of M22344 (H7) strain, AF508607 (H9) strain, or AY676037 (H5) strain, which are 3 representative serum types (H7, H9, H5) of an avian influenza virus, which is described later.
  • the sequences of SEQ ID NOS: 37 to 52 are sequences predicted by the above-mentioned method to be the highest in terms of binding to an HLA-A2 molecule (a product of the HLA-A*0206 gene).
  • SEQ ID NOS: 37 to 52 are arranged in decreasing binding order. That is, SEQ ID NO: 37 is the sequence that is predicted to have the best binding.
  • a predicted score for binding to the HLA-A2 molecule and binding experiment data for each sequence are expressed in the form of -log Kd values.
  • an HLA-binding peptide containing one or more types of amino acid sequence selected from the group consisting of SEQ ID NOS: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 34, 35, 36, 37, 38, 40, 41, 43, 45, 47, 48, 49, 50, 51, and 52 is experimentally confirmed to bind to a human HLA-A type molecule. It can therefore be said with certainty that it is an HLA-binding peptide that has excellent properties in binding to a human HLA-A type molecule.
  • the binding to an HLA molecule of the HLA-binding peptide related to the present embodiment is 3 or greater in terms of a -log Kd value, particularly preferably 5 or greater, and more preferably 5.4 or greater.
  • a binding ability, in terms of a -log Kd value, of about 3 is the threshold level for whether or not a peptide actually binds to an MHC, which includes an HLA. Therefore, if the binding to an HLA molecule, in terms of a -log Kd value, is 3 or greater, it can be said that it is an HLA-binding peptide.
  • the binding to the HLA-A24 molecule in terms of a -log Kd value, is 5 or greater, since the peptide obtained has excellent properties in binding to the HLA molecule, it can suitably be used for the development of an effective therapeutic drug, prophylactic drug, and the like for an immune disease and the like.
  • the peptide obtained has particularly good properties in binding to the HLA molecule, and it can suitably be used for the development of an even more effective therapeutic drug, prophylactic drug, and the like for an immune disease and the like.
  • the HLA-binding peptide related to the present embodiment consists of not less than 8 and not more than 11 amino acid residues.
  • the peptide consists of not less than 8 and not more than 11 amino acid residues, it has excellent properties in binding to an HLA molecule.
  • the cytotoxic T lymphocyte specifically recognizes a virus antigen (CTL epitope) consisting of 8 to 11 amino acids presented in an HLA class I molecule on the surface of a cell infected with a virus and the like, and eliminates the virus by damaging the infected cell. It is important to prepare such a CTL epitope consisting of 8 to 11 amino acids that is specific to a virus and the like in order to prepare a vaccine for therapy or prevention against the virus and the like.
  • the above-mentioned HLA-binding peptide may be a peptide consisting of amino acid residues alone, but it is not particularly limited thereto.
  • it may be an HLA-binding peptide precursor that is optionally modified with a sugar chain or a fatty acid group and the like as long as the effects of the present invention are not impaired.
  • Such a precursor is subjected to a change involving digestion by a proteolytic enzyme and the like in a living mammalian body such as in a human digestive organ to become an HLA-binding peptide, thus exhibiting similar effects to those shown by the above-mentioned HLA-binding peptide.
  • the above-mentioned HLA-binding peptide may be a peptide that binds to a human HLA-A24 molecule.
  • the above-mentioned HLA-binding peptide may also be a peptide that binds to a human HLA-A2 molecule.
  • a peptide that binds to an HLA-A24 molecule, which is often seen in Asian people, such as Japanese people, it can be utilized in the development of a therapeutic drug, a prophylactic drug, and the like that is particularly effective for Asian people, such as Japanese people.
  • a peptide is obtained that binds to an HLA-A2 molecule, which is often seen in European and American people in addition to Japanese people, it can be utilized in the development of a therapeutic drug, a prophylactic drug, and the like that is particularly effective for European and American people in addition to Japanese people.
  • the amino acid sequence contained in the HLA-binding peptide may be an amino acid sequence derived from a certain genome protein of an avian influenza virus, but is not particularly limited.
  • it may be an amino acid sequence derived from an HIV protein, an amino acid sequence derived from a cedar pollen protein, and the like. It may also contain an amino acid sequence derived from another pathogenic or allergenic protein.
  • an amino acid sequence is contained that is derived from a nucleoprotein of an avian influenza virus, which is described later, an HLA-binding peptide that can be utilized in the prevention, treatment, and the like of a disease caused by the avian influenza virus can be obtained.
  • an HLA-binding peptide that binds to an HLA-A type molecule, contains an amino acid sequence formed by deletion, substitution, or addition of one or two amino acid residues of the amino acid sequence contained in the above-mentioned HLA-binding peptide, and consists of not less than 8 and not more than 11 amino acid residues.
  • the constitution includes an amino acid sequence formed by deletion, substitution, or addition of one or a few amino acid residues of a specific amino acid sequence that binds to an HLA-A type molecule, similar effects to those of the HLA-binding peptide related to the above-mentioned embodiment 1 are exhibited.
  • amino acid sequences of the nucleoproteins of M22344 strain, AF508607 strain, and AY676037 strain of the avian influenza virus are different from each other in part, but since the correlation between prediction data and experimental data for the -log Kd value is high, that is, a sequence that is determined from prediction data to have binding properties shows a good -log Kd value in experimental data, it can be predicted that even an amino acid sequence that is formed by deletion, substitution, or addition of one or two amino acid residues of an amino acid sequence that shows binding properties will show excellent HLA-binding properties in a similar manner.
  • amino acid residues that are substituted are preferably amino acid residues having similar properties to each other, such as both being hydrophobic amino acid residues.
  • the HLA-binding peptides described in Embodiment 1 and Embodiment 2 can be produced using a method known to a person skilled in the art. For example, they may be artificially synthesized by a solid-phase method or a liquid-phase method. Alternatively, these HLA-binding peptides may be produced by expressing them from a DNA fragment or a recombinant vector coding for these HLA-binding peptides. These HLA-binding peptides thus obtained can be identified by a method known to a person skilled in the art. For example, identification is possible by use of Edman degradation, mass spectrometry, and the like.
  • a DNA fragment containing a DNA sequence coding for the above-mentioned HLA-binding peptide Since the DNA fragment related to the present embodiment contains a specific DNA sequence, it can express the above-mentioned HLA-binding peptide.
  • expression may be carried out by incorporating this DNA fragment into a cell, or expression may be carried out by using a commercial artificial protein expression kit.
  • continuous expression may be carried out by incorporating the above-mentioned DNA fragment into, for example, a human cell.
  • an HLA-binding peptide can be made to be present continuously within a cell by incorporating a DNA fragment coding for the HLA-binding peptide into the cell rather than incorporating the HLA-binding peptide itself into the cell.
  • an HLA-binding peptide is used as a vaccine, such an ability to express continuously is advantageous in terms of enhancing the efficacy of the vaccine.
  • the DNA fragment related to the present embodiment can be produced by a method known to a person skilled in the art. For example, it may be artificially synthesized by means of a commercial DNA synthesizer and the like. Alternatively, it may be segmented from the HCV genome by using a restriction enzyme and the like. Alternatively, it may be amplified from the HCV genome by a PCR method using a primer. The DNA fragment thus obtained may be identified using a method known to a person skilled in the art. For example, it may be identified by a commercial DNA sequencer.
  • a recombinant vector that contains a DNA sequence coding for the above-mentioned HLA-binding peptide. Since the recombinant vector related to the present embodiment contains a specific DNA sequence, the above-mentioned HLA-binding peptide can be expressed.
  • expression may be carried out by incorporating this recombinant vector into a cell, or expression may be carried out by using a commercial artificial protein expression kit.
  • continuous expression may be carried out by incorporating the above-mentioned recombinant vector into, for example, a human cell. Because of this, the HLA-binding peptide can be made to be present continuously within a cell by incorporating a recombinant vector coding for the HLA-binding peptide into the cell rather than incorporating the HLA-binding peptide itself into the cell.
  • the HLA-binding peptide is used as a vaccine, such an ability to express continuously is advantageous in terms of enhancing the efficacy of the vaccine.
  • the amount of HLA-binding peptide expressed can be controlled with high precision by the use of a certain sequence in a regulatory region involved in transcription and expression, such as a promoter region upstream of a DNA sequence coding for the above-mentioned HLA-binding peptide.
  • the copy number of the recombinant vector in a cell can be controlled with high precision by the use of a certain sequence in a regulatory region involved in replication, such as the origin region of the recombinant vector.
  • the above-mentioned recombinant vector may freely contain a sequence other than the DNA sequence coding for the above-mentioned HLA-binding peptide.
  • it may contain a sequence of a marker gene such as a drug resistance gene.
  • the recombinant vector related to the present embodiment can be produced using a method known to a person skilled in the art. For example, it may be obtained by cleaving a multicloning site of a commercial vector such as pBR322 or pUC19 at a certain restriction enzyme site, and inserting the above-mentioned DNA fragment into the site and carrying out ligation. Furthermore, the recombinant vector thus obtained can be identified using a method known to a person skilled in the art.
  • the length of the DNA fragment cleaved by a predetermined restriction enzyme coincides with the restriction map of a commercial vector such as pBR322 or pUC19 and, furthermore, it can be identified by a DNA sequencer and the like whether or not the above-mentioned DNA sequence is contained in the DNA sequence cut out from the multicloning site.
  • Embodiments of the present invention are described above, but they are exemplifications of the present invention, and various constitutions other than those above may be employed.
  • an HLA-binding peptide containing an amino acid sequence derived from a certain genome protein of avian influenza virus is used, but an HLA-binding peptide containing an amino acid sequence derived from another protein of avian influenza virus may be used. In such a case, it can be utilized in the treatment of various immune diseases related to the protein from which it is derived.
  • HLA-binding peptide for a pathogen other than avian influenza virus such as an HIV virus, or an allergen such as cedar pollen
  • HLA-binding peptide containing an amino acid sequence derived from a protein such as a cancer cell.
  • HLA-binding peptides can be used suitably in treatment or prevention centering around infectious diseases (influenza, SARS, HIV, HCV, and the like), and in cancer immunotherapy, allergic disease (hay fever, rheumatism, atopy, asthma, and the like), autoimmune disease, and the like.
  • FIG. 1 A schematic drawing for the active learning experiment design employed here is shown in FIG. 1 .
  • a trial of a lower-order learning algorithm which will be described later, was carried out once. That is, a plurality of hypotheses were generated by random sampling from accumulated data and, with regard to randomly expressed candidate query points (peptides), a point that showed the largest distribution of predicted values was selected as a query point to be subjected to an experiment.
  • the peptide at the selected query point was prepared by a synthesis and purification method, which will be described later, and the actual binding ability was measured by an experiment, which will be described later, and added to accumulated data.
  • a supervised learning algorithm of a Hidden Markov Model was used, and 20 to 30 types of peptides were predicted and selected per experiment by starting with the initial data for 223 types of peptides; the above-mentioned procedure was repeated four times, and a total of 341 data points were obtained.
  • the active learning method of the present example 20 to 30 types of peptides containing an amino acid sequence in which 9 of 20 types of amino acids were arranged were designed and synthesized per experiment.
  • the strength of binding (binding ability) thereof to an HLA molecule was measured.
  • the binding ability (Kd value) was obtained as an experimental result.
  • the peptide was selected as a candidate for an HLA-binding peptide that could be used as a material for a vaccine.
  • the results thus obtained were inputted into a learning system equipped with a learning machine employing the Hidden Markov Model as a mathematical algorithm, and rules were created.
  • the learning machine sampled different results to prepare the rules.
  • the rules expressed by the learning machine had different constitutions.
  • the rules thus obtained and experimental data were stored as needed as accumulated data.
  • the number of repetitions of the binding experiment for peptides consisting of 9 amino acid residues which would otherwise have to be carried out for the 500 billion or more combinations of all the candidates for HLA-binding peptides, could be reduced.
  • a rule was formed by experiment, and the experiment was repeated for tens of sequence candidates that were predicted by applying the rule. Because of this, the number of experiments could be cut, and the time and cost of the initial screening could be greatly reduced.
  • the hit rate for prediction of the binding of a peptide to HLA by the rule obtained by the active learning method reached 70 to 80%, whereas the hit rate by other known techniques such as the anchor method was as low as about 30%.
  • a peptide was manually synthesized by the Merrifield solid-phase method using Fmoc amino acids. After deprotection, reverse phase HPLC purification was carried out using a C18 column to give a purity of 95% or higher. Identification of the peptide and confirmation of its purity were carried out using a MALDI-TOF mass spectrometer (Voyager DE RP, PerSeptive). Quantitative analysis of the peptide was carried out by a Micro BCA assay (Pierce Corp.) using BSA as a standard protein.
  • ClR-A24 cells were first exposed to acidic conditions at a pH of 3.3 for 30 seconds, thus dissociating and removing a light chain ⁇ 2m, which is associated with HLA class I molecules in common, and an endogenous peptide originally bound to the HLA-A*2402 molecule. After neutralization, purified ⁇ 2m was added to ClR-A24 cells, the obtained product was added to serial dilutions of a peptide, and incubated on ice for 4 hours.
  • Staining was carried out using fluorescently labeled monoclonal antibody 17A12, which recognizes association (MHC-pep) of the three members, that is, HLA-A*2402 molecule, the peptide, and ⁇ 2m, which had reassociated during the incubation.
  • MHC-pep monoclonal antibody 17A12
  • the MHC-pep count per ClR-A24 cell (proportional to the strength of fluorescence of the above-mentioned fluorescent antibody) was quantitatively measured using a FACScan fluorescence-activated cell sorter (Becton Dickinson Biosciences).
  • a binding dissociation constant Kd value between the HLA-A24 molecule and the peptide was calculated from the average strength of fluorescence per cell by a published method (Udaka et al., Immunogenetics, 51, 816-828, 2000).
  • JY cells were first exposed to acidic conditions at a pH of 3.8 for 30 seconds, thus dissociating and removing a light chain ⁇ 2m and an endogenous peptide, which were noncovalently associated with the HLA-A*0201 molecule. After neutralization, a reassociation experiment was carried out.
  • JY cells and the purified ⁇ 2m were added to stepped dilutions of peptide for which the binding ability would be measured, and incubation was carried out on ice for 4 hours.
  • HLA-A*0201 molecules that had reassociated up to this point were stained using the associating type specific fluorescently-labeled monoclonal antibody BB7.2.
  • HLA-A2 molecule which is a product of the HLA-A*0206 gene
  • RA2.6 cells cell strain newly prepared in Kochi University
  • RAMS cells mouse TAP peptide transporter deficient cells.
  • RA2.6 cells were first cultured overnight at 26° C.; when HLA-A*0206 molecules having no peptide bound thereto were deposited on the cell surface, stepped dilutions of peptide were added; binding was carried out at room temperature for 30 minutes.
  • the cells were stained by adding thereto fluorescently labeled monoclonal antibody 17A10 or 17A12, which specifically recognize the peptide-binding HLA-A*0206 molecule, and incubating on ice for 20 minutes.
  • sequences of SEQ ID NOS: 1 to 20 in Table 1 are sequences consisting of 9 amino acid residues contained in the full-length sequence of a nucleoprotein of M22344 strain, AF508607 strain, or AY676037 strain of avian influenza virus registered in GENBANK.
  • the sequences of SEQ ID NOS: 1 to 20 are sequences predicted by a hypothesis obtained using the experimental design method explained in Embodiment 1 to be the highest in terms of binding to an HLA-A24 molecule (a product of the HLA-A*2402 gene).
  • SEQ ID NOS: 1 to 20 are arranged in decreasing binding order. That is, SEQ ID NO: 1 is the sequence that is predicted to have the best binding.
  • the full-length amino acid sequence of the nucleoprotein of M22344 strain of avian influenza virus is shown in SEQ ID NO: 53
  • sequences of SEQ ID NOS: 21 to 36 in Table 2 are sequences consisting of 9 amino acid residues contained in a nucleoprotein of M22344 strain, AF508607 strain, or AY676037 strain of the above-mentioned avian influenza virus.
  • the sequences of SEQ ID NOS: 21 to 36 are sequences predicted by a hypothesis obtained using the experimental design method explained in Embodiment 1 to be the highest in terms of binding to an HLA-A2 molecule (a product of the HLA-A*0201 gene).
  • SEQ ID NOS: 21 to 36 are arranged in decreasing binding order. That is, SEQ ID NO: 21 is the sequence that is predicted to have the best binding.
  • sequences of SEQ ID NOS: 37 to 52 in Table 3 are sequences consisting of 9 amino acid residues contained in a nucleoprotein of M22344 strain, AF508607 strain, or AY676037 strain of the above-mentioned avian influenza virus.
  • the sequences of SEQ ID NOS: 37 to 52 are sequences predicted by a hypothesis obtained using the experimental design method explained in Embodiment 1 to be the highest in terms of binding to an HLA-A2 molecule (a product of the HLA-A*0206 gene).
  • SEQ ID NOS: 37 to 52 are arranged in decreasing binding order. That is, SEQ ID NO: 37 is the sequence that is predicted to have the best binding.
  • Table 1 to Table 3 show, with regard to each of the nucleoproteins of M22344 strain, AF508607 strain, or AY676037 strain of avian influenza virus, the amino acid sequences with the highest scores in the predicted results obtained using the above-mentioned prediction program, the predicted score, and the corresponding binding experiment data. All of the binding experiments were obtained by artificially synthesizing a 9-amino acid peptide by the above-mentioned synthetic method.
  • amino acid sequences of the nucleoproteins of avian influenza virus M22344 strain, AF508607 strain, and AY676037 strain are registered in GenBank, sequences consisting of 9 amino acid residues thereamong, which become HLA-binding peptides, are not currently registered.
  • M22344 strain H7 type
  • H5 type H5 type
  • HLA-binding peptide contained in the nucleoprotein of such an influenza virus epidemic strain which is spreading in Europe or Asia, has been found.
  • This HLA-binding peptide can suitably be utilized in the development of preventive/therapeutic vaccines for avian influenza in Europe and Asia.
  • amino acid sequences of the nucleoproteins of M22344 strain, AF508607 strain, and AY676037 strain of the avian influenza virus are different from each other in part, but it can be predicted that even amino acid sequences in which one or a few amino acid residues of the amino acid sequences are substituted for each other will show excellent HLA-binding properties in the same way as described above.
  • the third from the left in the SEQ ID NO: 7 peptide of the M22344 strain is N
  • the SEQ ID NO: 9 peptide of the AF508607 strain it is S instead of N
  • the fifth from the left in the SEQ ID NO: 7 peptide of the M22344 strain is V
  • the SEQ ID NO: 9 peptide of the AF508607 strain and the SEQ ID NO: 6 peptide of the AY676037 strain it is I instead of V.
  • the first from the left in the SEQ ID NO: 8 peptide of the M22344 strain is N
  • the SEQ ID NO: 11 peptide of the AF508607 strain is S instead of N.
  • the fourth from the left in the SEQ ID NO: 14 peptide of the M22344 strain is G
  • the SEQ ID NO: 15 peptide of the AY676037 strain is S instead of G.
  • the third from the left in the SEQ ID NO: 16 peptide of the M22344 strain is S, whereas in the SEQ ID NO: 18 peptide of the AY676037 strain it is N instead of S.
  • the sixth from the left in the SEQ ID NO: 17 peptide of the M22344 strain is D
  • the sixth from the left in the SEQ ID NO: 13 peptide of the AF508607 strain it is E instead of D
  • the third from the left in the SEQ ID NO: 17 peptide of the M22344 strain is K
  • the SEQ ID NO: 10 peptide of the AY676037 strain it is R instead of K.
  • the fifth from the left in the SEQ ID NO: 21 peptide of the M22344 strain is H
  • the SEQ ID NO: 26 peptide of the AF508607 strain it is N instead of H.
  • the fifth from the left in the SEQ ID NO: 23 peptide of the M22344 strain is V
  • the SEQ ID NO: 27 peptide of the AF508607 strain is I instead of V.
  • the third from the left in the SEQ ID NO: 7 peptide of the M22344 strain is N
  • the SEQ ID NO: 9 peptide of the AF508607 strain it is S instead of N
  • the experimental binding value for the SEQ ID NO: 7 peptide of the M22344 strain is 7.80781
  • the experimental binding value for the SEQ ID NO: 9 peptide of the AF508607 strain is 7.80229.
  • the fifth from the left in the SEQ ID NO: 7 peptide of the M22344 strain is V
  • the SEQ ID NO: 9 peptide of the AF508607 strain and the SEQ ID NO: 6 peptide of the AY676037 strain it is I instead of V
  • the experimental binding value for the SEQ ID NO: 7 peptide of the M22344 strain is 7.80781
  • the experimental binding value for the SEQ ID NO: 9 peptide of the AF508607 strain is 7.80229
  • the experimental binding value for the SEQ ID NO: 6 peptide of the AY676037 strain is 7.56449, thus confirming that binding is good in all cases.
  • the first from the left in the SEQ ID NO: 8 peptide of the M22344 strain is N
  • the SEQ ID NO: 11 peptide of the AF508607 strain it is S instead of N
  • the experimental binding value for the SEQ ID NO: 8 peptide of the M22344 strain is 7.76375
  • the experimental binding value for the SEQ ID NO: 11 peptide of the AF508607 strain is 7.71879, thus confirming that binding is good in either case.
  • the fourth from the left in the SEQ ID NO: 14 peptide of the M22344 strain is G
  • the SEQ ID NO: 15 peptide of the AY676037 strain it is S instead of G
  • the experimental binding value for the SEQ ID NO: 14 peptide of the M22344 strain is 7.54336
  • the experimental binding value for the SEQ ID NO: 15 peptide of the AY676037 strain is 7.43594, thus confirming that binding is good in either case.
  • the third from the left in the SEQ ID NO: 16 peptide of the M22344 strain is S
  • the SEQ ID NO: 18 peptide of the AY676037 strain it is N instead of S
  • the experimental binding value for the SEQ ID NO: 16 peptide of the M22344 strain is 5.74415
  • the experimental binding value for the SEQ ID NO: 18 peptide of the AY676037 strain is 5.37438, thus confirming that binding is good in either case.
  • the sixth from the left in the SEQ ID NO: 17 peptide of the M22344 strain is D
  • the SEQ ID NO: 13 peptide of the AF508607 strain it is E instead of D
  • the experimental binding value for the SEQ ID NO: 17 peptide of the M22344 strain is 7.32598
  • the experimental binding value for the SEQ ID NO: 13 peptide of the AF508607 strain is 7.25015.
  • the third from the left in the SEQ ID NO: 17 peptide of the M22344 strain is K
  • the SEQ ID NO: 10 peptide of the AY676037 strain it is R instead of K
  • the experimental binding value for the SEQ ID NO: 17 peptide of the M22344 strain is 7.32598
  • the experimental binding value for the SEQ ID NO: 10 peptide of the AY676037 strain is 7.49653, thus confirming that binding is good in all cases.
  • the fifth from the left in the SEQ ID NO: 21 peptide of the M22344 strain is H
  • the SEQ ID NO: 26 peptide of the AF508607 strain it is N instead of H
  • the experimental binding value for the SEQ ID NO: 21 peptide of the M22344 strain is 5.08483
  • the experimental binding value for the SEQ ID NO: 26 peptide of the AF508607 strain is 4.90353
  • the fifth from the left in the SEQ ID NO: 23 peptide of the M22344 strain is V
  • the SEQ ID NO: 27 peptide of the AF508607 strain it is I instead of V
  • the experimental binding value for the SEQ ID NO: 23 peptide of the M22344 strain is 5.57857
  • the experimental binding value for the SEQ ID NO: 27 peptide of the AF508607 strain is 4.8085, thus confirming that binding is good in either case.
  • any of the peptide sequences in which one or two amino acid residues are substituted for each other will show excellent binding to an HLA-A molecule.
  • an amino acid sequence formed by deletion, substitution, or addition of one or a few amino acid residues of an amino acid sequence shown by SEQ ID NOS: 1 to 52 that has excellent properties in binding to an HLA-A molecule can be predicted to similarly show excellent HLA-binding properties.
  • amino acid residues that are substituted are preferably amino acid residues that have similar properties to each other, such as the two being hydrophobic amino acid residues.
  • the nucleoprotein of the M22344 strain, AF508607 strain, or AY676037 strain of avian influenza virus was used, but another protein or another strain of the avian influenza virus may be used.
  • HLA binding properties can be predicted with high accuracy.

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US11618770B2 (en) 2015-03-09 2023-04-04 Nec Corporation MUC1-derived peptide, and pharmaceutical composition for treatment or prevention of cancer, immunity-inducing agent and method for manufacturing antigen presenting cell using same
CN114835778A (zh) * 2022-04-27 2022-08-02 华南农业大学 一种h9n2亚型aiv mhc b2限制性表位肽及其应用

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