JP7504025B2 - Cys-mabのコンジュゲーション方法 - Google Patents
Cys-mabのコンジュゲーション方法 Download PDFInfo
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- JP7504025B2 JP7504025B2 JP2020504698A JP2020504698A JP7504025B2 JP 7504025 B2 JP7504025 B2 JP 7504025B2 JP 2020504698 A JP2020504698 A JP 2020504698A JP 2020504698 A JP2020504698 A JP 2020504698A JP 7504025 B2 JP7504025 B2 JP 7504025B2
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- A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
- A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
- A61K47/6811—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being a protein or peptide, e.g. transferrin or bleomycin
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- A61K47/6889—Conjugates wherein the antibody being the modifying agent and wherein the linker, binder or spacer confers particular properties to the conjugates, e.g. peptidic enzyme-labile linkers or acid-labile linkers, providing for an acid-labile immuno conjugate wherein the drug may be released from its antibody conjugated part in an acidic, e.g. tumoural or environment
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Description
アルゴリズム:Needleman et al.,1970,J.Mol.Biol.48:443-453;
比較マトリックス:Henikoff et al.,1992(上記)のBLOSUM 62;
ギャップペナルティー:12(ただし、エンドギャップに対するペナルティなし)
ギャップ長ペナルティ:4
類似性の閾値:0
(1)疎水性:ノルロイシン、Met、Ala、Val、Leu、Ile、
(2)中性親水性:Cys、Ser、Thr;
(3)酸性:Asp、Glu;
(4)塩基性:Asn、Gln、His、Lys、Arg;
(5)鎖配向に影響する残基:Gly、Pro;及び
(6)芳香族:Trp、Tyr、Phe。
(Gly)3Lys(Gly)4(配列番号32);
(Gly)3AsnGlySer(Gly)2(配列番号33);
(Gly)3Cys(Gly)4(配列番号34);及び
GlyProAsnGlyGly(配列番号35)。
GGEGGG(配列番号41);
GGEEEGGG(配列番号42);
GEEEG(配列番号43);
GEEE(配列番号44);
GGDGGG(配列番号45);
GGDDDGG(配列番号46);
GDDDG(配列番号47);
GDDD(配列番号48);
GGGGSDDSDEGSDGEDGGGGS(配列番号49);
WEWEW(配列番号50);
FEFEF(配列番号51);
EEEWWW(配列番号52);
EEEFFF(配列番号53);
WWEEEWW(配列番号54);又は
FFEEEFF(配列番号55)。
抗GIPR/GLP-1ペプチドコンジュゲートの生成
抗GIPR抗体2G10_LC1.003を、配列番号151(軽鎖)にE70C変異を有するように、又は配列番号152(重鎖)にE275C変異を有するように操作した。ビスシステアミンでキャップした抗GIPR Cys mAb(20mM酢酸ナトリウム(pH5.0)中に3~12mg/mLのIgG1)を2~4当量のトリフェニルホスフィン-3,3’,3”-トリスルホネートを用いて、室温で、部分的に還元した。陽イオン交換クロマトグラフィー(CEX)を使用して、反応の進行をモニターした(典型的には1~2時間で完了)。遊離したシステアミンを、20mM酢酸ナトリウム(pH5.0)への緩衝液交換によって、部分的に過剰還元されたIgG1からパージした。得られた部分的に過剰還元されたシステアミンを含まないCys mAb(3~12mg/mL)を、4~7当量の4mMのデヒドロアスコルビン酸、0.5MのNa2HPO4を添加してpH7.0-7.5にした後、2~8℃でインキュベートして再酸化した。再酸化の進行を逆相HPLCでモニターした。IgG1が完全に再形成される(典型的には、1~3時間)とすぐに、C末端リンカー(配列番号29)を有する2~3当量のブロモアセチル-GLP-1ペプチド(配列番号129)を添加し、反応混合物を2~8℃でさらにインキュベートした。アルキル化反応の進行を、標的ペプチド対抗体比(PAR)プロファイルが得られるまで(例えば、≧95%PAR2、<5%PAR0+PAR1)、LC/MS及び/又はCEXによってモニターした。酢酸を用いてpHを5.0に調整することによって反応混合物の反応を停止させた。所望のPAR2抗GIPR/GLP-1コンジュゲートを、疎水性相互作用クロマトグラフィー(HIC)を用いて精製し、続いて10%酢酸ナトリウム、9%スクロース、pH5.2中へUF/DFにより製剤化した。
Cys mAbタンパク質(IgG1)との成功した部位特異的コンジュゲーションは、ジスルフィド架橋IgG1足場に操作されたシステイン残基を選択的に還元する(「無キャップ」)能力に大きく依存する。この実際的に困難なプロセスは、IgG1四量体を保持する少なくとも16個の天然ジスルフィド結合の存在下で、2つの操作されたシステインのジスルフィド結合のみを還元することを目的とする。単一工程の選択的還元が非常に望ましいが、現在のところは実現可能ではない(図1)。代わりに、以下のような2工程の純選択的還元が開発された(図2)。
Claims (28)
- 抗体コンジュゲート又は抗体断片コンジュゲートを調製する方法であって、
a)抗体又は抗体断片を含む組成物を得る工程;
b)前記抗体又は抗体断片をシステインブロッキング剤に曝露する工程(ここで、前記システインブロッキング剤は、システアミンであり、前記抗体又は抗体断片の少なくとも1つのシステイン残基と安定な混合ジスルフィドを形成する);
c)還元剤を前記組成物に添加して還元混合物を形成し、前記還元混合物が還元抗体又は還元抗体断片を含むように還元反応を生じさせる工程(ここで、前記還元剤は、トリフェニルホスフィン-3,3’,3”-トリスルホネート(「TPPTS」)である);
d)酸化剤を前記還元混合物に添加して酸化混合物を形成し、前記酸化混合物が酸化抗体又は酸化抗体断片を含むように酸化反応を生じさせる工程;及び
e)活性化学部分を前記酸化混合物に添加してコンジュゲーション混合物を形成し、抗体コンジュゲート又は抗体断片コンジュゲートが形成されるように共役反応を生じさせる工程
を含む方法。 - 前記混合ジスルフィドは、キャップされた遊離システインを有する抗体又は抗体断片である、請求項1に記載の方法。
- 工程b)の後及び工程c)の前に、カチオン交換クロマトグラフィーを行って、過剰のシステインブロッキング剤を除去する、請求項1に記載の方法。
- 還元剤対抗体又は抗体断片の比は2~4:1(モル/モル)である、請求項1に記載の方法。
- 工程c)の後及び工程d)の前に、緩衝液交換工程を行って前記還元剤を除去する、請求項1~4のいずれか一項に記載の方法。
- 前記緩衝液交換工程は、限外濾過/透析濾過である、請求項5に記載の方法。
- 前記酸化剤はデヒドロアスコルビン酸(「DHAA」)である、請求項1~6のいずれか一項に記載の方法。
- 酸化剤対抗体又は抗体断片の比は3~6:1(モル/モル)である、請求項7に記載の方法。
- 前記活性化学部分は、ハロゲンを含むペプチドであり、前記ハロゲンはBr、I、及びClからなる群から選択される、請求項1~8のいずれか一項に記載の方法。
- 活性化学部分対抗体又は抗体断片の比は2~3:1(モル/モル)である、請求項9に記載の方法。
- 工程e)に続いて、精製工程を行って、前記活性化学部分を除去する、請求項1~10のいずれか一項に記載の方法。
- 前記精製工程は、疎水性相互作用クロマトグラフィー(「HIC」)、限外濾過/透析濾過、又は疎水性相互作用クロマトグラフィー(「HIC」)後に限外濾過/透析濾過を含む、請求項11に記載の方法。
- 抗体コンジュゲート又は抗体断片コンジュゲートを調製する方法であって、
a)システアミンキャップを含むキャップされた遊離システインを有する抗体又は抗体断片を含む混合ジスルフィドを含む組成物を得る工程;
b)前記組成物に還元剤を添加して還元混合物を形成し、前記還元混合物が還元抗体又は還元抗体断片を含むように還元反応を生じさせる工程(ここで、前記還元剤は、トリフェニルホスフィン-3,3’,3”-トリスルホネート(「TPPTS」)である);
c)酸化剤を前記還元混合物に添加して酸化混合物を形成し、前記酸化混合物が酸化抗体又は酸化抗体断片を含むように酸化反応を生じさせる工程;及び
d)活性化学部分を前記酸化混合物に添加してコンジュゲーション混合物を形成し、抗体コンジュゲート又は抗体断片コンジュゲートが形成されるように共役反応を生じさせる工程
を含む方法。 - 工程a)の後及び工程b)の前に、カチオン交換クロマトグラフィーを行って、過剰のシステインブロッキング剤を除去する、請求項13に記載の方法。
- 還元剤対抗体又は抗体断片の比は2~4:1(モル/モル)である、請求項13に記載の方法。
- 工程b)の後及び工程c)の前に、緩衝液交換工程を行って前記還元剤を除去する、請求項13~15のいずれか一項に記載の方法。
- 前記緩衝液交換工程は、限外濾過/透析濾過である、請求項16に記載の方法。
- 前記酸化剤はデヒドロアスコルビン酸(「DHAA」)である、請求項13~17のいずれか一項に記載の方法。
- 酸化剤対抗体又は抗体断片の比は3~6:1(モル/モル)である、請求項18に記載の方法。
- 前記活性化学部分は、ハロゲンを含むペプチドであり、前記ハロゲンはBr、I、及びClからなる群から選択される、請求項13~19のいずれか一項に記載の方法。
- 活性化学部分対抗体又は抗体断片の比は2~3:1(モル/モル)である、請求項20に記載の方法。
- 工程d)に続いて、精製工程を行って、前記活性化学部分を除去する、請求項13~21のいずれか一項に記載の方法。
- 前記精製工程は、疎水性相互作用クロマトグラフィー(「HIC」)、限外濾過/透析濾過、又は疎水性相互作用クロマトグラフィー(「HIC」)後に限外濾過/透析濾過を含む、請求項22に記載の方法。
- TPPTSの濃度が、約20~約100mMの酢酸ナトリウムを含む緩衝液中での濃度である、請求項1に記載の方法。
- TPPTSがNaClを含まない緩衝液に添加される、請求項24に記載の方法。
- TPPTSがpH約5.0の緩衝液に添加される、請求項24に記載の方法。
- TPPTSがpH約5.0の緩衝液に添加される、請求項25に記載の方法。
- TPPTSがNaClを含まない緩衝液に添加される、請求項26に記載の方法。
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AU2018309090A1 (en) | 2020-02-20 |
MX2020001327A (es) | 2020-03-20 |
EP3661562A1 (en) | 2020-06-10 |
WO2019028382A1 (en) | 2019-02-07 |
AU2018309090B2 (en) | 2023-03-30 |
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