抗生物質ダロバクチンはβ鎖を模倣して外膜挿入酵素を阻害する

Hundeep Kaur¹, Roman P Jakob¹, Jan K Marzinek²

¹Biozentrum, University of Basel, Basel, Switzerland.

Nature

|April 15, 2021

まとめ

ダロバクチンは新しい抗生物質で,天然の基質を模倣してバクテリアの挿入酵素BamAを標的にします. この相互作用は耐性に対して強力でグラム陰性感染症に対する新しい戦略を提供します

科学分野:

微生物学
構造生物学
薬物の発見

背景:

抗菌剤耐性は,グラム陰性細菌を標的とした新しい抗生物質を必要とします.
グラム陰性細菌の外膜は薬の開発にユニークな課題と機会を提示しています
バクテリアの挿入酵素BamAは,外膜タンパク質生殖に関与する必須のBAM複合体の重要な成分です.

研究の目的:

自然化合物のダロバクチンの作用の原子レベルを解明する.
ダロバクチンがバクテリアの挿入酵素BamAの機能を抑制する仕組みを理解するためです
新しい抗生物質の合理的な設計のための洞察を提供するためにBammaをターゲットにします.

主な方法:

ダロバクチンBamA複合体の構造を決定するために,冷凍電子顕微鏡とX線結晶学を用いた.
本来の質量スペクトロメトリーと in vivo 実験は機能的な洞察を提供した.
結合相互作用とダイナミクスを分析するために分子動力学シミュレーションを使用した.

主要な成果:

ダロバクチンは固いβ鎖構造を採用し,ネイティブの基板認識信号を模倣する.
ダロバクチンは,Bamaの側面ゲートに結合し,脂質分子を移動させ,膜を延長された結合ポケットとして利用します.
相互作用は主に堅固な脊髄接触によって媒介され,変異に対する耐性を授与する.

結論:

BamAの横のゲートは,抗生物質を標的とする重要な機能部位として特定されています.
ダロバクチンのメカニズムはグラム陰性細菌に対する新しい抗生物質の開発の青写真を提供します
この研究により細菌のアキレス・ヒールを利用した薬の開発が進められます

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