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Agrobacterium tumefaciens and Agrobacterium rhizogenes-Mediated Transformation of Potato and the Promoter Activity of a Suberin Gene by GUS Staining
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モノデヒドロアスコルベート還元酵素は植物におけるTNT毒性を媒介する

Emily J Johnston1, Elizabeth L Rylott2, Emily Beynon1

  • 1Centre for Novel Agricultural Products, Department of Biology, University of York, York YO10 5DD, UK.

Science (New York, N.Y.)
|September 5, 2015
PubMed
まとめ

2,4,6-トリニトロトルエン (TNT) から生じる植物毒性は,ミトコンドリアの還元によって発生し,超酸化物を生成する. モノデヒドロアスコルベート還元酵素6 (MDHAR6) はこれを触媒化し,MDHAR6を欠く植物はTNTに耐性を持ち,除草剤の開発に新たな標的となる.

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科学分野:

  • 環境科学
  • 植物生物学
  • 生物化学

背景:

  • 2,4,6-トリニトロトルーエン (TNT) は有毒で持続的な環境汚染物質です.
  • 植物を用いた植物修復は 爆発物の除去のための費用対効果の高い戦略です
  • TNTの植物毒性の正確なメカニズムはほとんど不明である.

研究 の 目的:

  • 植物におけるTNTの植物毒性の基礎となる分子メカニズムを解明する.
  • TNTの解毒や活性化に関与する重要な酵素を特定する.
  • 環境修復と除草剤の開発のための潜在的な植物ベースのターゲットを探求する.

主な方法:

  • 植物ミトコンドリアのTNT減少を調査した.
  • TNTの代謝で発生した活性酸素種 (ROS)
  • モノデヒドロアスコルベート還元酵素6 (MDHAR6) を含む特定の酵素に欠けているアラビドプシス・タリアナの変異体を使用した.

主要な成果:

  • TNTの植物毒性はミトコンドリアの減少によって媒介され,ニトロラジカルを形成する.
  • この基質は酸素と反応して 重要な反応性酸素種である 超酸化物を生成します
  • 機能的なMDHAR6がないアラビドプシスは,TNTに対する耐性が著しく高まった.
  • MDHAR6は,TNTの植物毒性経路における重要な触媒として特定されました.

結論:

  • TNTの植物毒性は,主にミトコンドリアの減少と,MDHAR6によって触媒化された,その後の超酸化物生成によって引き起こされる.
  • MDHAR6の遺伝子改変またはターゲティングは,TNTに対する植物耐性を高め,植物修復に役立ちます.
  • MDHAR6は新しい除草剤を開発し,除草剤耐性問題に取り組むための新しい植物特有のターゲットです.