JP6532136B2 - 抗体に結合する低分子化合物のスクリーニング方法 - Google Patents
抗体に結合する低分子化合物のスクリーニング方法 Download PDFInfo
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Description
上記抗体の軽鎖の可変領域において、下記アミノ酸配列1を有するフレームワーク領域に含まれる第1の結合標的部位と、上記抗体の重鎖の可変領域において、下記アミノ酸配列2を有するフレームワーク領域に含まれる第2の結合標的部位の両方に対して、ドッキングシミュレーションにおいて低ドッキングスコアを示す化合物を選択する工程を含むことを特徴とする方法。
アミノ酸配列1: 配列番号1に示されるアミノ酸配列において、第9位のXaaがセリン、フェニルアラニン、ロイシン、グリシン、アラニンまたはアスパラギン酸であり、第15位のXaaがプロリン、バリン、トレオニンまたはロイシンであり、第24〜31位のXaaが任意のアミノ酸または欠失であり、第39位のXaaがグルタミン、リシン、ロイシンまたはグルタミン酸であり、第79位および第80位のXaaが任意のアミノ酸または欠失であるアミノ酸配列
アミノ酸配列2: 配列番号2に示されるアミノ酸配列において、第9位のXaaがグリシン、アラニン、プロリンまたはセリンであり、第14位のXaaが任意のアミノ酸または欠失であり、第17位のXaaがグリシン、アラニン、セリン、トレオニン、グルタミン、グルタミン酸、アルギニンまたはアスパラギン酸であり、第41〜43位のXaaが任意のアミノ酸または欠失であり、第47位のXaaがバリン、メチオニン、イソロイシンまたはロイシンであり、第50位のXaaがバリン、ロイシン、フェニルアラニンまたはイソロイシンであり、第56位のXaaがトレオニン、アルギニン、メチオニン、グルタミン酸、リシン、アスパラギンまたはアスパラギン酸であり、第61位のXaaがロイシン、アラニン、バリンまたはフェニルアラニンであり、第65位のXaaがロイシン、メチオニン、トリプトファンまたはイソロイシンであり、第66位のXaaがセリン、アルギニン、トレオニン、アスパラギン、グリシンまたはシステインであるアミノ酸配列
アミノ酸配列3: 配列番号3に示されるアミノ酸配列において、第4位のXaaがグリタミン、リシン、ロイシンまたはグルタミン酸であるアミノ酸配列
アミノ酸配列4: 配列番号4に示されるアミノ酸配列
アミノ酸配列5: 配列番号5に示されるアミノ酸配列において、第6位のXaaが任意のアミノ酸または欠失であるアミノ酸配列
アミノ酸配列6: 配列番号6に示されるアミノ酸配列
公知のヒト抗体の軽鎖(κ鎖)と重鎖の代表的なアミノ酸配列をアラインメントした結果(http://www2.mrc−lmb.cam.ac.uk/vbase/alignments2.php;図1および図2)を用いて、各鎖で配列相同性の高いアミノ酸配列を抽出し、共通アミノ酸配列とした。得られた軽鎖、重鎖の各共通アミノ酸配列のフレームワーク領域のアミノ酸配列のアラインメントを実施し、軽鎖で共通する配列として配列番号1の配列と、重鎖で共通する配列として配列番号2を導き出した。さらに、これら配列番号1と配列番号2の配列それぞれにおいて、抗体の立体構造上、表面に露出しており、且つ、配列相同性が比較的高い配列を抽出した。軽鎖における当該配列を配列番号3と配列番号4に、重鎖における当該配列を配列番号5と配列番号6に示す。なお、配列番号3と配列番号4とを合わせた配列全体と、配列番号5と配列番号6とを合わせた配列全体との配列相同性は42%であった。
1. 入手しやすいENAMINE社製化合物
2. 分子量が250以上
3. 水素結合ドナー数が5以下、水素結合アクセプター数が10以下
4. 水溶性(clogP5未満)
5. 反応性の高い構造を除く
立体構造が明らかにされている公知のヒト抗体のデータベースであるPDB(http://pdbj.org)に登録されているデータの中から、上記実施例1と同様にして、上記共通アミノ酸配列(配列番号1と配列番号2)との配列相同性が50%以上のアミノ酸配列をフレームワーク領域中に有するものを検索し、抽出されたものの中からヒト抗体(PDBコード:2hwz)の立体構造をダウンロードした。当該ヒト抗体2hwzの軽鎖のフレームワーク領域のアミノ酸配列と配列番号1との配列相同性は91%、重鎖のフレームワーク領域のアミノ酸配列と配列番号2との配列相同性は57%であった。当該ヒト抗体2hwzにおいて、上記実施例1で選択した結合標的部位に対応する窪み(ポケット)を結合標的部位として選択した。このとき、選択したヒト抗体2hwzの軽鎖のフレームワーク領域の結合標的部位のアミノ酸配列と、軽鎖のフレームワーク領域の結合標的部位における共通アミノ酸配列(配列番号3,4)との配列相同性は83%、重鎖のフレームワーク領域の結合標的部位のアミノ酸配列と、重鎖のフレームワーク領域の結合標的部位における共通アミノ酸配列(配列番号5,6)との配列相同性は58%であった。また、ヒト抗体2hwzにおける軽鎖、重鎖の結合標的部位のアミノ酸配列間の配列相同性は58%であった。
軽鎖と重鎖の2つの結合標的部位のうちどちらか一方だけに低いドッキングスコアを与える化合物の一例を表4に示す。表4中、「N/A」は、軽鎖、重鎖それぞれの結合標的部位に対するドッキングスコアが上位10000個の中に入っていなかったため、スコアの値が無いことを示す。
Claims (3)
- 抗体に結合する低分子化合物をスクリーニングする方法であって、
上記抗体の軽鎖の可変領域において、下記アミノ酸配列1を有するフレームワーク領域に含まれる第1の結合標的部位と、上記抗体の重鎖の可変領域において、下記アミノ酸配列2を有するフレームワーク領域に含まれる第2の結合標的部位の両方に対して、ドッキングシミュレーションにおいて低ドッキングスコアを示す化合物を選択する工程を含むことを特徴とする方法。
アミノ酸配列1: 配列番号1に示されるアミノ酸配列において、第9位のXaaがセリン、フェニルアラニン、ロイシン、グリシン、アラニンまたはアスパラギン酸であり、第15位のXaaがプロリン、バリン、トレオニンまたはロイシンであり、第24〜31位のXaaが任意のアミノ酸または欠失であり、第39位のXaaがグルタミン、リシン、ロイシンまたはグルタミン酸であり、第79位および第80位のXaaが任意のアミノ酸または欠失であるアミノ酸配列
アミノ酸配列2: 配列番号2に示されるアミノ酸配列において、第9位のXaaがグリシン、アラニン、プロリンまたはセリンであり、第14位のXaaが任意のアミノ酸または欠失であり、第17位のXaaがグリシン、アラニン、セリン、トレオニン、グルタミン、グルタミン酸、アルギニンまたはアスパラギン酸であり、第41〜43位のXaaが任意のアミノ酸または欠失であり、第47位のXaaがバリン、メチオニン、イソロイシンまたはロイシンであり、第50位のXaaがバリン、ロイシン、フェニルアラニンまたはイソロイシンであり、第56位のXaaがトレオニン、アルギニン、メチオニン、グルタミン酸、リシン、アスパラギンまたはアスパラギン酸であり、第61位のXaaがロイシン、アラニン、バリンまたはフェニルアラニンであり、第65位のXaaがロイシン、メチオニン、トリプトファンまたはイソロイシンであり、第66位のXaaがセリン、アルギニン、トレオニン、アスパラギン、グリシンまたはシステインであるアミノ酸配列 - 上記第1の結合標的部位が、下記アミノ酸配列3およびアミノ酸配列4を含む請求項1に記載の方法。
アミノ酸配列3: 配列番号3に示されるアミノ酸配列において、第4位のXaaがグルタミン、リシン、ロイシンまたはグルタミン酸であるアミノ酸配列
アミノ酸配列4: 配列番号4に示されるアミノ酸配列 - 上記第2の結合標的部位が、下記アミノ酸配列5およびアミノ酸配列6を含む請求項1または2に記載の方法。
アミノ酸配列5: 配列番号5に示されるアミノ酸配列において、第6位のXaaが任意のアミノ酸または欠失であるアミノ酸配列
アミノ酸配列6: 配列番号6に示されるアミノ酸配列
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