細胞内タンパク質相互作用を標的としたα/βペプチド折りたたみ
James W Checco, Erinna F Lee1,2, Marco Evangelista1
1The Walter and Eliza Hall Institute of Medical Research , Parkville, Victoria 3052, Australia.
Journal of the American Chemical Society
|August 29, 2015
まとめ
アルファアミノ酸とベータアミノ酸を組み合わせた改造ペプチドは,安定性と細胞浸透性を高めています. これらの新しいアルファ/ベータペプチドは,アポトーシスに関わるタンパク質の相互作用を効果的に阻害し,治療の可能性を向上させます.
科学分野:
- 生物化学
- 分子生物学
- 薬物の発見
背景:
- 従来のペプチドは,タンパク質分解と細胞膜の薄い透過性による短い半減期を含む,in vivoでの制限に直面しています.
- これらの制限は,治療用途のタンパク質-タンパク質相互作用の有効なアンタゴニストとしてのペプチドの開発を妨げています.
研究 の 目的:
- 細胞内タンパク質相互作用を標的とするアルファ/ベータペプチドアプローチを拡張する.
- Bim BH3 アルファペプチドを基にステープルアルファ/ベータペプチドを設計し,評価する.
主な方法:
- アルファ・ベータ・ペプチドの生成は,アルファ・アミノ酸とベータ・アミノ酸の両方の残基を含んでいる.
- アルファヘリクスの安定性を高めるために,炭化水素のクロスリンクを持つ"ステップされた"アルファ/ベータペプチドの設計.
- 細胞の浸透性,タンパク質分解性,および親アルファペプチドの機能模倣の評価.
主要な成果:
- ステープルされたアルファ/ベータペプチドは,親のステープルされたアルファペプチドの構造と機能を成功裏に模倣した.
- アルファ/ベータペプチドは,特定の細胞タイプに侵入し,アポプトシス信号におけるタンパク質相互作用を阻害する能力を示した.
- アルファ/ベータペプチドは,親アルファペプチドと比較して,タンパク質分解に対する約100倍の耐性を示した.
結論:
- アルファ/ベータペプチド設計によるバックボーン改変は,サイドチェーンクロスリンクのような周辺的改変と組み合わせると,相乗効果をもたらす.
- アルファ/ベータペプチドは,より安定し,細胞に浸透するペプチド療法を開発するための有望な戦略です.
- このアプローチは,特に細胞内プロセスをターゲットにすることで,生物医学的な応用のためのペプチド工学の可能性を高めます.
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