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ABCトランスポーター MsbA の二重モード阻害のための構造的基礎
Hoangdung Ho1, Anh Miu2, Mary Kate Alexander3
1Structural Biology, Genentech Inc., San Francisco, CA, USA.
Nature
|May 4, 2018
まとめ
研究者はG907という小さな分子が グラム陰性細菌の重要な伝達物質である MsbAを抑制する方法を発見しました この発見は,ATP結合カセットトランスポーターを調節し,新しい抗生物質を設計するための新しいメカニズムを明らかにします.
科学分野:
- 構造生物学
- 微生物学
- 薬理学について
背景:
- グラム陰性細菌の内膜を横断するコア・リポポリサッカリドの輸送は,ATP結合カセット (ABC) トランスポーター MsbAによって媒介され,極めて重要です.
- MsbAの構造は脂質輸送に関する洞察を提供しますが,その薬理学的調節を理解することは限られています.
研究 の 目的:
- 小分子抗体G907によるMsbA抑制の構造的基礎を解明する.
- 治療開発のためのABCトランスポーター対抗性の新しいメカニズムを明らかにする.
主な方法:
- MsbAの2.9 Å解像度構造をG907との複合で決定した.
- G907によって誘発された結合部位と形状の変化を特定するために構造分析を使用した.
主要な成果:
- G907は,保存されたトランスメブランポケットに結合することによって,MsbAを内向きのリポポリサカリド結合形状に閉じ込めます.
- G907は,核酸結合ドメインを分離することによって,第2のアロステリック抑制メカニズムを誘導する.
結論:
- この研究は,G907によるABCトランスポーター阻害の前例のないメカニズムを示しています.
- ABCトランスポーターの選択的調節とMsbAを標的とした新しい抗生物質の合理的な設計のための枠組みを提供します.
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