NAIPによるバクテリアリガンドの先天性免疫認識は,炎症性の特異性を決定する
Eric M Kofoed1, Russell E Vance
1Division of Immunology and Pathogenesis, Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, USA.
Nature
|August 30, 2011
まとめ
異なるNAIPタンパク質は,NLRC4炎症ゾームの特定のセンサーとして作用し,細菌のフラゲリンとPrgJを区別して免疫反応を開始します.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- 微生物学 微生物学とは
背景:
- インフラマソームは先天的な免疫に不可欠であり,病原菌と戦うためにカスパース1を活性化します.
- NLRC4炎症ゾームはフラゲリンやPrgJのような細菌成分を認識しますが,特異性メカニズムは不明です.
- NLRC4のホモログであるNAIPタンパク質は,炎症体の活性化に関与しているが,その正確な役割と特異性はよく定義されていない.
研究 の 目的:
- 異なる細菌結合体に対するNLRC4炎症ソーム特異性の分子基盤を解明する.
- バクテリアの成分を感知する際の異なるNAIPパラログの特定の役割を特定する.
- NAIPsがリガンドに依存するNLRC4炎症体活性化を媒介するメカニズムを調査する.
主な方法:
- ネズミで再構成されたNLRC4炎症ゾームシステムを利用しました.
- フラゲリンとPrgJによるNLRC4活性化のためのNAIPパラログの必要性を調査した.
- タンパク質-リガンドの相互作用とオリゴメリゼーションを評価するための生化学的測定を行った.
主要な成果:
- 異なるNAIPパラログがNLRC4炎症ゾームに特異性を与えていることを実証しました.
- PrgJ誘発のNLRC4活性化にはNAIP2が必要であり,フラゲリン誘発の活性化にはNAIP5とNAIP6が必要であることを示した.
- NAIPタンパク質がリンガンド依存のNLRC4オリゴメリゼーションを媒介し,特定の細菌リンガンドと物理的に結合することを明らかにした.
結論:
- NLRC4炎症ゾームの直接免疫センサータンパク質としてNAIPを特定した.
- NAIP-NLRC4炎症体活性化のための受容体-リガンドモデルを確立し,リガンド特異性を説明しました.
- 生まれながらの免疫認識におけるNAIP遺伝子間の機能的専門化に関する生化学的証拠を提供した.
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