JP7626753B2 - Fc領域の一部を欠損した抗体を含む試薬 - Google Patents
Fc領域の一部を欠損した抗体を含む試薬 Download PDFInfo
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- JP7626753B2 JP7626753B2 JP2022510697A JP2022510697A JP7626753B2 JP 7626753 B2 JP7626753 B2 JP 7626753B2 JP 2022510697 A JP2022510697 A JP 2022510697A JP 2022510697 A JP2022510697 A JP 2022510697A JP 7626753 B2 JP7626753 B2 JP 7626753B2
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- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
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- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
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- C—CHEMISTRY; METALLURGY
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- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
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Description
[1]
Fc領域におけるCH3又はCH2の一部が欠損している抗体を含む、試薬。
[2]
CH3又はCH2の全部が欠損している、[1]に記載の試薬。
[3]
CH2の全部が欠損しており、CH3が直接的又は間接的に抗体のヒンジ領域に結合している、[1]に記載の試薬。
[4]
抗体がIgGである、[1]~[3]のいずれかに記載の試薬。
[5]
CH3又はCH2の一部の欠損により抗体の非特異反応が抑制される、[1]~[4]のいずれかに記載の試薬。
[6]
非特異反応が、Fc領域に結合する非特異反応因子により生じる、[5]に記載の試薬。
[7]
非特異反応因子が検体中の補体C1q、Fcγ受容体又はリウマチ因子である、[6]に記載の試薬。
[8]
抗体と診断対象の抗原との間の抗原抗体反応が、Fc領域非欠損の抗体のものと比べて同等以上である、[1]~[7]のいずれかに記載の試薬。
[9]
抗体がマウス、ウサギ、ラット、モルモット、ハムスター、ヤギ、ヒツジ又はラクダに由来する、[1]~[8]のいずれかに記載の試薬。
[10]
抗体がヒト抗体、ヒト化抗体又はヒトキメラ抗体である、[1]~[9]のいずれかに記載の試薬。
[11]
抗体が非ヒトキメラ抗体である、[1]~[9]のいずれかに記載の試薬。
[12]
診断のための、[1]~[11]のいずれかに記載の試薬。
[13]
研究のための、[1]~[11]のいずれかに記載の試薬。
[14]
[1~[11]のいずれかに記載の試薬を含む、キット。
[15]
[1]~[11]のいずれかに記載の試薬とブロッキング剤を含む、キット。
[16]
担体を含む、[14]又は[15]に記載のキット。
[17]
抗体が担体表面に結合している、[16]に記載のキット。
[18]
担体がマイクロプレート又はラテックスである、[16]又は[17]に記載のキット。
[19]
抗体がリンカーを介して担体に固定化されている、[16]~[18]のいずれかに記載のキット。
[20]
Fc領域におけるCH3又はCH2の一部が欠損している抗体を用いる、抗原抗体反応の非特異的反応を抑制する方法。
第一の実施形態において、本発明は、Fc領域におけるCH3又はCH2の一部が欠損している抗体を含む、試薬、を提供する。
第二の実施形態において、本発明は試薬を含むキット、を提供する。
第三の実施形態において、本発明は、Fc欠損抗体を用いる、抗原抗体反応の非特異的反応を抑制する方法、を提供する。
Fc領域を欠損させる抗体として、抗H5N1ヘマグルチニン抗体(Xueyong Zhu et al.," A unique and conserved neutralization epitope in H5N1 influenza viruses identified by an antibody against the A/Goose/Guangdong/1/96 hemagglutinin", Journal of virology.2013;87(23):12619?35. PMID:24049169)と抗ブチルコリンエステラーゼ抗体(Peng H.et al." Comparison of 5 monoclonal antibodies for immunopurification of human butyrylcholinesterase on Dynabeads: KD values, binding pairs, and amino acid sequences", Chemico-Biological Interactions.2015;240: 336-345. DOI: 10.1016/j.cbi.2015.08.024;PMID:26343001)を選択した。
軽鎖
DIVLTQSPGSLTVSLGQRATISCRASESVDNFGKSFMHWYQQKPGQSPKLLIYRASNREFGIPARFNGSGSGTDFALTINPVEADDVATYFCQQSNEDPRTFGGGTKLEIKRADAAPTVSIFPPSSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKTSTSPIVKSFNRNEC(配列番号1:GenBank, KF499999)
重鎖
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号2:GenBank, KF500000)
軽鎖
DILLTQSPAILSVSPGERVRLSCRASQSCGTSIYWYQQRTNGSPRLLIMYASEPFSGIPSRFSGSGSGTDFTLSINSVESEDIADYYCQQSNSWPWTFGGGTRLEIKRADAAPTVSIFPPSSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKTSTSPIVKSFNRNEC(配列番号3:GenBank, KT189148)
重鎖
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号4:GenBank, KT189147)
ΔCH3は各抗体の重鎖のCH3を欠損した抗体を表す。CH3はEUナンバリング標記で341から447の領域である。そのため、対応のコンストラクトはEUナンバリング標記で118から340のアミノ酸から成る定常領域(Fc領域)で構成されるタンパク質と言い換えることができる。これらの特徴を反映させた名称として、ΔCH3をΔ341-447またはFc118-340ともいう。以降、他の欠損抗体についても同様のルールで名称を付けた。尚、ΔCH3のC末端にはGSリンカー(GGGGS)とHisタグ(HHHHHH)を連結した。
1.3.1.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGGGGSHHHHHH(配列番号5)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGGGGSHHHHHH(配列番号6)
具体的な配列を以下に示す。
1.3.2.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAGGGGSHHHHHH(配列番号7)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAGGGGSHHHHHH(配列番号8)
1.3.3.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTGGGGSHHHHHH(配列番号9)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTGGGGSHHHHHH(配列番号10)
1.3.4.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGRPKAGGGGSHHHHHH(配列番号11)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGRPKAGGGGSHHHHHH(配列番号12)
1.3.5.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTFRSVSELPIMHQDWLNGKEFKCRVNSAAFPAPIEKTISKTKGRPKAPQVYTGGGGSHHHHHH(配列番号13)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTVPEVSSVFIFPPKPKDVLTITLTPKVTCVVVDISKDDPEVQFSWFVDDVEVHTAQTQPREEQFNSTF(配列番号14)
ΔCH2は抗IgE抗体の重鎖のCH2を欠損し、前後のヒンジ領域とCH3を連結したものを表す。CH2はEUナンバリング標記で231から340の領域である。そのため、コンストラクトはEUナンバリング標記で118から230のアミノ酸と、341から447のアミノ酸を連結した定常領域(Fc領域)で構成されるタンパク質と言い換えることができる。
1.4.1.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号19)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号20)
1.4.2.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号21)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号22)
1.4.3.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号23)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号24)
1.4.4.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号25)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号26)
1.4.5.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号27)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGKGGGGSHHHHHH(配列番号28)
1.4.6.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSPIEKTISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号29)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSPIEKTISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号30)
1.4.7.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号31)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSISKTKGRPKAPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号32)
1.4.8.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号33)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSPQVYTIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号34)
1.4.9.1.抗H5N1ヘマグルチニン抗体
EVHLQQSGPELVKPGASVKMSCKTSGYTFTEYTIHWMKQSHGKSLEWIGGIFPNNGDTTYNQKFKVRATLTVGRSSSTAYMDLRSLTSEDSAVYYCVRNYGSSYGYFDVWGAGTTVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号35)
QVQLQQSGAELARPGASVKLSCKASGYTFTSQWLQWVKQRPGQGLEWIGAIYPGDGDTRYTQKFKGKATLTADKSSSTAYMQLTNLAPEDSAVYYCARSSMDYWGQGTSVTVSSAKTTPPSVYPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSSSVTVPSSTWPSETVTCNVAHPASSTKVDKKIVPRDCGCKPCICTGGGGSGGGGSGGGGSGGGGSIPPPKEQMAKDKVSLTCMITDFFPEDITVEWQWNGQPAENYKNTQPIMDTDGSYFVYSKLNVQKSNWEAGNTFTCSVLHEGLHNHHTEKSLSHSPGK(配列番号36)
凍結した感染葉500gを量りとり、カッターミキサーで粉砕した。粉砕物に抽出溶液(100mM Tris、250mM NaCl、40mM アスコルビン酸ナトリウム)250mLを添加し、感染葉を繰り返し粉砕した。
感染葉に3倍量の抽出バッファー(100mM Tris,250mM NaCl,5mM EDTA)を加えてビーズミルで破砕し、氷上で30min放置したのち、遠心分離(8000xg,4℃、10分間)して上清を回収し、SDS-PAGE及びウエスタンブロッティングで分析した。
精製された抗体と非特異因子の相互作用を表面プラズモン共鳴(SPR)法により評価した。装置はBIAcore X-100(ビアコア社製)を用いた。非特異因子として、Fc受容体(Fcガンマ受容体I、Fcガンマ受容体II)、C1q、リウマチ因子を用いた。
ビオチン標識したヒト由来FcγRI又はFcγRII(Sino Biological社製。いずれも精製品)をSensor Chip CAP(GEヘルスケア社製)で捕捉し、抗体との相互作用にともなうシグナル(レゾナンスユニット:RU)の上昇を観察した。ランニングバッファーは0.01M HEPES pH7.4、0.15M NaCl、3mM EDTA、0.05% Tween20を使い、25℃で30μL/分の流速で測定した。測定は全てn=3で実施した(以下同様)。FcγRIに対する抗体の結合結果を図3及び4に、FcγRIIに対する抗体の結合結果を図5及び6に示す。
Sensor chip Protein L(GEヘルスケア社製)で抗体を捕捉し、ヒト由来C1q(Abcam社製ab96363。精製品)との相互作用にともなうシグナル(レゾナンスユニット:RU)の上昇を観察した。ランニングバッファーは0.01M HEPES pH7.4、0.15M NaCl、3mM EDTA、0.05% Tween20を使い、25℃で30μL/分の流速で測定した。C1qに対する抗体の結合結果を図7及び8に示す。
アミンカップリング法によりSensor chip CM5(GEヘルスケア社製)に抗体を結合させ、Rf陽性のヒト血清または血漿との相互作用にともなうシグナル(レゾナンスユニット:RU)の上昇を観察した。ランニングバッファーは0.01M HEPES pH7.4、0.15M NaCl、3mM EDTA、0.05% Tween20を使い、25℃で30μL/分の流速で測定した。
以下の手順に従い、得られた抗体のラテックスへの結合効率を評価した。
IgEに対する抗体を用いて、以下の通りに免疫凝集法による測定試薬を調製した。
i)抗体を平均粒径200nmのポリスチレンラテックス浮遊液1mLに対し0.1mg担持させてなる感作粒子を、0.1%となるように緩衝液(グリシン、pH7.3)中で懸濁し、ラテックス浮遊液を調製した。
ii)緩衝液(グリシン、pH8.3)を準備した。
自動分析装置は日立社製7180型自動分析装置によりエンドポイント法で自動測定を行った。上記(1)のi)で調製した試薬を用いて、非特異反応により偽陽性反応を示すことがわかっている4個のヒト検体と非特異反応の起こらない15個の検体の測定を行った。検体溶液3.5μLに対し、上記(1)のii)で調製した緩衝液140μLを添加し、この混合液を37℃で撹拌混合した。5分間放置後、ラテックス浮遊液70μLを添加し、更に37℃で撹拌混合した。約5分間の凝集反応を吸光度変化量として測定し、検量線より各検体のIgE濃度を算出した。
Claims (19)
- 抗原抗体反応の非特異的反応を抑制するための試薬であって、Fc領域におけるCH3の少なくとも一部が欠損している抗体を含む、試薬。
- CH3の全部が欠損している、請求項1に記載の試薬。
- 抗体がIgGである、請求項1又は2に記載の試薬。
- CH3の欠損により抗体の非特異反応が抑制される、請求項1~3のいずれか一項に記載の試薬。
- 非特異反応が、Fc領域に結合する非特異反応因子により生じる、請求項4に記載の試薬。
- 非特異反応因子が検体中の補体C1q、Fcγ受容体又はリウマチ因子である、請求項5に記載の試薬。
- 抗体と診断対象の抗原との間の抗原抗体反応が、Fc領域非欠損の抗体のものと比べて同等以上である、請求項1~6のいずれか一項に記載の試薬。
- 抗体がマウス、ウサギ、ラット、モルモット、ハムスター、ヤギ、ヒツジ又はラクダに由来する、請求項1~7のいずれか一項に記載の試薬。
- 抗体がヒト抗体、ヒト化抗体又はヒトキメラ抗体である、請求項1~8のいずれか一項に記載の試薬。
- 抗体が非ヒトキメラ抗体である、請求項1~8のいずれか一項に記載の試薬。
- 診断のための、請求項1~10のいずれか一項に記載の試薬。
- 研究のための、請求項1~10のいずれか一項に記載の試薬。
- 請求項1~10のいずれか一項に記載の試薬を含む、キット。
- 請求項1~10のいずれか一項に記載の試薬とブロッキング剤を含む、キット。
- 担体を含む、請求項13又は14に記載のキット。
- 抗体が担体表面に結合している、請求項15に記載のキット。
- 担体がマイクロプレート又はラテックスである、請求項15又は16に記載のキット。
- 抗体がリンカーを介して担体に固定化されている、請求項15~17のいずれか一項に記載のキット。
- Fc領域におけるCH3の一部が欠損している抗体を用いる、抗原抗体反応の非特異的反応を抑制する方法。
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WO2015129651A1 (ja) | 2014-02-25 | 2015-09-03 | 富士レビオ株式会社 | 改変単量体IgM |
JP2017531426A (ja) | 2014-10-01 | 2017-10-26 | メディミューン リミテッド | Lox1特異的結合タンパク質及びその使用 |
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US20090155255A1 (en) | 2007-09-27 | 2009-06-18 | Biogen Idec Ma Inc. | Cd23 binding molecules and methods of use thereof |
JP2012021972A (ja) | 2010-06-15 | 2012-02-02 | Daiichikosho Co Ltd | 電荷測定による発電酵素を用いた迅速高感度分子検出定量法、および該方法に用いるための検出部並びに装置 |
WO2015129651A1 (ja) | 2014-02-25 | 2015-09-03 | 富士レビオ株式会社 | 改変単量体IgM |
JP2017531426A (ja) | 2014-10-01 | 2017-10-26 | メディミューン リミテッド | Lox1特異的結合タンパク質及びその使用 |
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