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Updated: Jun 18, 2026

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Myeloid Innate Signaling Pathway Regulation by MALT1 Paracaspase Activity
Published on: January 7, 2019
RETRACTED:タイプI分泌の硫化ペプチドがXA21媒介の先天性免疫を誘発する
Sang-Won Lee1, Sang-Wook Han, Malinee Sririyanum
1Department of Plant Pathology, University of California, Davis, CA 95616, USA.
まとめ
米の木にはXA21免疫受容体があり,Ax21と呼ばれる細菌のタンパク質を認識します. Ax21からの特定の硫化ペプチドは,Xanthomonas oryzaeに対するこの植物免疫を活性化するために不可欠です.
科学分野:
- 植物病理学 植物病理学
- 分子生物学は分子生物学である.
- 免疫学 免疫学とは
背景:
- 米のXa21遺伝子は,Xanthomonas oryzae pv.に対する耐性を提供しています. オリザエ (Xoo) とは
- XA21媒介免疫に関与する分子成分を特定することは,植物防御機構を理解するために重要である.
研究 の 目的:
- XA21媒介免疫を誘発するXooの特定の分子を特定する.
- XA21の分子基礎を解明し,そのバクテリアリガンドの認識.
主な方法:
- 液体染色体-タンデム質量スペクトロメトリー (LC-MS/MS) を用いて,Xooの超水素を分析した.
- タンパク質の相互作用を研究するために,共免疫プレシピテーションアッセイが行われました.
- 特定されたタンパク質から派生した合成ペプチドは,生物学的活性についてテストされました.
主要な成果:
- 194アミノ酸のタンパク質であるAx21は,Xooのスーパーナタンスの活性成分として特定されました.
- Ax21のN端から17アミノ酸硫化ペプチド (axY(S) 22がXA21媒介免疫を誘発するのに十分であった.
- ペプチドのチロシン硫化は,その生物学的活性に不可欠でした.
- XA21は axY(S) 22ペプチドに直接結合し,共免疫降水によって示されています.
- axY(S) 22ペプチドは,Xanthomonas種の間で保存されています.
結論:
- Ax21は病原体関連分子パターン (PAMP) として機能します.
- XA21はパターン認識受容体 (PRR) として作用し,硫酸性 axY(S) 22ペプチドを特異的に認識します.
- この発見は,細菌の病原体に対するXA21ベースの植物免疫の基礎にある分子相互作用を明確にします.
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