JP2005164587A - 特異標的部位に結合するリガンドのスクリーニング - Google Patents
特異標的部位に結合するリガンドのスクリーニング Download PDFInfo
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Abstract
【解決手段】様々な医薬標的結合部位での結合識別用化合物のスクリーニング方法を、結合反応のエンタルピーを測定するディバイスで使用する。該方法はテストリガンドと標的化合物とを併合すること、および少なくとも1種の遮断剤の存在下にテストリガンドと標的化合物とを併合することからなる。一次反応熱は併合したテストリガンドと標的化合物の溶液について検出し、二次反応熱は少なくとも1種の遮断剤の存在下に、併合したテストリガンドと標的化合物の溶液について検出する。この反応の2つの熱を比較し、反応が起こったかどうかを判定する。
【選択図】図3
Description
酵素Eに対する基質SとテストリガンドLとの競合結合の計算
条件は該基質が反応を受けないものとする。例えば、EはATPキナーゼでよく、Sは基質、またATPは供給しない;基質はATPが存在しないのでリン酸化されることはない。選択肢として、非水解性ATP類似体、例えば、アデニリルイミド二リン酸(AMP−PNP)またはアデノシン5′−[γ−チオ]三リン酸(ATP−γ−S)などを存在させてもよい。酵素に対する基質の結合(KSは解離平衡定数である)は、Eが遊離の酵素、Sが遊離の基質、またE・Sが互いに結合した酵素Eと基質Sであるとした場合、以下の反応がモデルとなる:
KS=基質と酵素の結合に対して2μM
S0=基質の合計濃度=1mM
E0=酵素の合計濃度=5μM
L0=テストリガンドの合計濃度=7.5μM
ΔHL=リガンドと酵素の結合に対して−10kcal/モル
ΔHS=基質と酵素の結合に対して−1kcal/モル
より高いKSでの酵素Eに対する基質SとテストリガンドLの競合結合
KSがより大きい場合、基質は基質部位にテスト化合物が結合するのを阻害するのに効果的ではない。
KS=基質と酵素の結合に対して100μM
S0=基質の合計濃度=2mM
E0=酵素の合計濃度=5μM
L0=テストリガンドの合計濃度=7.5μM
ΔHL=リガンドと酵素の結合に対して−10kcal/モル
ΔHS=基質と酵素の結合に対して−1kcal/モル
以下の実施例では、遮断剤B(例えば、特定の結合部位に対するすでに同定したリガンド)の結合およびリガンドLと酵素Eとの同時結合について考える。本実施例で我々は遮断剤Bの結合部位以外の部位に対する結合剤についてスクリーニングするが、これは実施例1および2の場合と逆の場合である。ナノ熱量計または他の測定ディバイスの測定領域において、我々は酵素と遮断剤の液滴を、テストリガンドと遮断剤の液滴と併合する。参照領域において、我々は遮断剤の液滴(酵素含まず)と、遮断剤およびテストリガンドの液滴を併合する。ナノ熱量計により測定領域と参照領域にて発生した熱の差を測定する。条件は遮断剤が酵素反応を受けないようにする。
(式12)
(式13)
ただし、E′は遊離のE、およびBに結合しLには結合していないEをプラスしたものである。等式11〜13を解いて、結合したリガンドL量を決定し、結合のモルエンタルピーに結合種の濃度を掛けて、独立結合に対する温度シグナルを求める。
KB=基質と酵素の結合に対して20nM
B0=遮断剤の合計濃度=1mM
E0=酵素の合計濃度=5μM
L0=テストリガンドの合計濃度=7.5μM
ΔHL=リガンドと酵素の結合に対して−10kcal/モル
ΔHB=遮断剤と酵素の結合に対して−12kcal/モル
Claims (3)
- 種々の薬物標的結合部位における結合識別のための化合物のスクリーニング法であって、かかる結合の反応エンタルピーを測定するディバイスを使用し;
該反応エンタルピー測定ディバイス上の少なくとも1つの一次位置にて、少なくとも1種のテストリガンドと少なくとも1種の標的化合物とを併合すること、その場合の当該標的化合物が少なくとも1つの結合対象部位と少なくとも1つの回避すべき結合部位を含むこと;
該反応エンタルピー測定ディバイス上の少なくとも1つの二次位置にて、少なくとも1種の一次遮断剤の存在下に、少なくとも1種のテストリガンドと少なくとも1種の標的化合物とを併合すること、その場合の当該標的化合物が少なくとも1つの結合対象部位と少なくとも1つの回避すべき結合部位を含むこと;
当該一次位置にて、当該併合した少なくとも1種のテストリガンドと当該少なくとも1種の標的化合物について一次反応熱を検出すること;
当該二次位置にて、遮断剤の存在下に、当該併合した少なくとも1種のテストリガンドと当該少なくとも1種の標的化合物について二次反応熱を検出すること;および
当該一次反応熱および二次反応熱を比較すること;
を含むことを特徴とするスクリーニング法。 - さらに、代替基質について予備スクリーニングを実施することを特徴とする請求項1に記載の化合物のスクリーニング法。
- 種々の薬物標的結合部位における結合識別のための化合物のスクリーニング法であって、かかる結合の反応エンタルピーを測定するナノ熱量測定ディバイスを使用し、その場合のナノ熱量測定ディバイスが、熱単離領域、参照領域、および測定領域を有し、該スクリーニング方法は;
少なくとも1ヶ所の測定領域内にて、少なくとも1滴の標的化合物を析出させること、その場合の当該標的化合物が少なくとも1つの結合対象部位と少なくとも1つの回避すべき結合部位を含むこと;
少なくとも1ヶ所の参照領域内にて、少なくとも1滴の標的化合物を析出させること、その場合の当該標的化合物が少なくとも1つの結合対象部位と少なくとも1つの回避すべき結合部位を含むこと;
少なくとも1ヶ所の測定領域内にて、少なくとも1滴のテスト化合物を析出させること;
少なくとも1ヶ所の参照領域内にて、少なくとも1滴のテスト化合物を析出させること;
少なくとも1ヶ所の参照領域内にて、少なくとも1種の一次遮断剤の存在下に、当該標的化合物と当該テスト化合物とを併合すること;
少なくとも1ヶ所の測定領域内にて、当該標的化合物と当該テスト化合物とを併合すること;
少なくとも1ヶ所の参照領域内にて、少なくとも1種の遮断剤の存在下に、当該併合した標的化合物と当該テスト化合物について一次反応熱を検出すること;
少なくとも1ヶ所の測定領域内にて、当該併合した標的化合物と当該テスト化合物について二次反応熱を検出すること;および
少なくとも1ヶ所の参照領域および少なくとも1ヶ所の測定領域について、当該反応熱を比較すること;
を含むことを特徴とするスクリーニング方法。
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JP2014505895A (ja) * | 2011-02-22 | 2014-03-06 | ザ トラスティーズ オブ コロンビア ユニバーシティ イン ザ シティ オブ ニューヨーク | マイクロデバイス、被分析物の熱特性を判定する方法、反応に係る熱量を判定する方法 |
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EP0921391A1 (en) * | 1997-12-05 | 1999-06-09 | Interuniversitair Micro-Elektronica Centrum Vzw | A device and a method thermal sensing |
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EP1320749A2 (en) * | 2000-09-05 | 2003-06-25 | The Althexis Company | Drug discover employing calorimetric target triage |
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JP2008304462A (ja) * | 2007-06-08 | 2008-12-18 | Palo Alto Research Center Inc | 熱量測定によるフラグメントタイプのランク付け |
JP2014505895A (ja) * | 2011-02-22 | 2014-03-06 | ザ トラスティーズ オブ コロンビア ユニバーシティ イン ザ シティ オブ ニューヨーク | マイクロデバイス、被分析物の熱特性を判定する方法、反応に係る熱量を判定する方法 |
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