クリプティック・オキシダティブ・リアレンジメントによる大麦のアレロパシーアルカロイドグラミンの生物合成

Sara Leite Dias¹, Ling Chuang^2,3, Shenyu Liu^2,3

¹Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr. 3, 06466 Seeland OT Gatersleben, Germany.

Science (New York, N.Y.)

|March 28, 2024

まとめ

科学者たちは防御的なアルカロイドである大麦のグラミン産生に責任を負う遺伝子を特定しました. この発見により,作物の特徴と草の耐性を改善するための標的型育種が可能になります.

科学分野:

植物生化学
遺伝学
植物の科学

背景:

グラミンは,小麦のような草の防御性アルカロイドで,昆虫を抑止し,反動物への食欲を低下させます.
グラミンの生物合成に責任を持つ特定の遺伝子は長い間謎であり作物改良の努力を阻害しています

研究の目的:

グラミンの生成を担う遺伝子を特定し特徴づけること
麦のグラミン関連特性を対象とした育種戦略を可能にする.

主な方法:

サイトクロームP450単酸化酵素CYP76M57 (AMIS) の遺伝子識別と機能的特徴づけ
異種系 (ニコチア・ベンタミアナ,アラビドプシス・タリアナ,サッカロミセス・セレヴィシア) でのグラミン産生を再構成する.
遺伝子の機能を確認するために,大麦 (Hordeum vulgare) の遺伝子編集 (Cas-mediated).

主要な成果:

グラミン生物合成の鍵となる遺伝子としてCYP76M57 (AMISと呼ばれる) を特定した.
複数の植物と酵母種で AMISの機能が実証されています
ゲノムエディティングでグラミンの生成を成功裏に解消しました
グラミン形成における新しい酸化再配置メカニズムを明らかにした.

結論:

グラミンの形成の遺伝的基礎は,現在理解されています.
この発見は優化されたグラミン結合特性を持つ大麦や他の草の育種に有効なツールとなります

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