予測された分類プラットフォームは,Xanthomonas euvesicatoriaのタイプIII分泌システムと,外部のpHに反応して動的に結合する

Christian Otten^1,2, Daniela Büttner³

¹Institute of Biology, Department of Genetics, Martin-Luther University Halle- Wittenberg, Halle (Saale), Germany.

BMC microbiology

|August 26, 2025

まとめ

クサントモナス・ユーベシカトリア菌

科学分野:

植物病理学
細菌学
分子生物学

背景:

Xanthomonas euvesicatoria (Xe) はペッパーとトマトの細菌性斑点病を引き起こす.
Xeは,植物細胞にエフェクタータンパク質を注入するために,タイプIII分泌 (T3S) システムを利用します.
植物病原体におけるT3S分類プラットフォームの構造と機能は不明である.

研究の目的:

Xe T3Sの分類プラットフォーム内のタンパク質相互作用を調査する.
主要なT3Sコンポーネント (HrcN,HrcL,HrcQ) の配置と組み立てを決定する.
外部pHがT3S複合体の形成と機能を調節する役割を明らかにする.

主な方法:

タンパク質とタンパク質の相互作用ネットワークの分析
タンパク質の局所化研究のための光顕微鏡
異なるpH条件下で細菌培養

主要な成果:

HrcQ複合体の形成は,HrcQとHrcNを橋渡しするHrcLに依存しています.
HrcQとHrcLは ATPase HrcNを安定させ,プリアセンブリされた複合体を示唆する.
HrcN-HrcL-HrcQ複合体は低pHで膜に局所するが,中性pHでは細胞質積分を形成する.

結論:

T3Sの分類プラットフォームのコンポーネント (HrcN,HrcL,HrcQ) はpHに敏感な複合体を形成する.
外部pHはT3S分類プラットフォームの組み立てと局所化に影響します.
このpH依存の調節は,植物病原菌におけるエフェクタータンパク質の配分を制御する可能性がある.

キーワード:

アトピーゼアルファフォールド 2 代替翻訳の開始植物病原体分類プラットフォームサブストラットドッキングタイプIIIの分泌

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