共通の折り合いは,脊椎動物の防御と細菌の攻撃を媒介する
Carlos J Rosado1, Ashley M Buckle, Ruby H P Law
1Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia.
まとめ
バクテリア膜攻撃複合体/パーフォリン (MACPF) タンパク質の結晶構造は,コレステロール依存性サイトオリシンとの類似性を明らかにしている. これは,MACPFタンパク質が,ポールを形成し,防御のために細胞膜を破壊するために同様のメカニズムを使用することを示唆しています.
科学分野:
- 構造生物学 構造生物学とは
- 免疫学 免疫学とは
- 微生物学 微生物学とは
背景:
- 膜攻撃複合体/パーフォリン (MACPF) ドメインは,脊椎動物の免疫と発達において極めて重要です.
- 脊椎動物のMACPFタンパク質は,コンプリメントC9やパーフェリンのような毛穴を形成し,バクテリアを溶解し,感染した細胞を殺します.
- MACPFタンパク質の機能的メカニズムは,ほとんど不明のままです.
研究 の 目的:
- MACPFタンパク質の機能の構造的基礎と潜在的なメカニズムを解明する.
- バクテリアと脊椎動物のMACPFタンパク質の関係を調査する.
主な方法:
- バクテリアのMACPFタンパク質,Plu-MACPFからPhotorhabdus luminescensの結晶構造を2.0アングストームの解像度で決定しました.
主要な成果:
- Plu-MACPFの結晶構造は,グラム陽性細菌の毛穴形成のコレステロール依存型サイトリシン (CDC) と構造的に有意な類似性を明らかにした.
- この構造的ホモロジーは,孔形成機構が保存されていることを示唆している.
結論:
- Plu-MACPFのようなバクテリアのMACPFタンパク質は,CDCと構造的折り合いを共有しており,膜攻撃の潜在的に保存されたメカニズムを示しています.
- 脊椎動物は,病原体に対する免疫防衛のためにMACPFドメインを含むCDCのようなメカニズムを利用する可能性があります.
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