花の調節物質であるLEAFYは,DNA結合ドメインの置換によって進化する

Alexis Maizel¹, Maximilian A Busch, Takako Tanahashi

¹Department of Molecular Biology, Max Planck Institute for Developmental Biology, D-72076 Tübingen, Germany.

Science (New York, N.Y.)

|April 12, 2005

まとめ

植物転写因子LEAFYはDNA結合ドメインが保存されているが,活性が変化している. LEAFYタンパク質の急速に進化する領域は,その機能に最小限の影響を及ぼします.

科学分野:

植物生物学植物生物学
進化生物学の進化生物学について
分子遺伝学分子遺伝学

背景:

植物特異の転写因子LEAFY (LFY) は,ライフサイクルイベントを調節する.
LFYは,モス (Physcomitrella patens) などの基礎植物において一般的な役割を果たしています.
LFYは,開花植物 (アニオスペルム) に特化した役割があり,花の運命を誘発します.

研究の目的:

陸上の植物の進化過程における LEAFY タンパク質の生化学的機能的進化を調査する.
LEAFYの機能が基礎植物から血管芽種にどのように変化したかを理解するために.

主な方法:

異なる植物系における LEAFY タンパク質の比較分析.
保存され,急速に進化しているLEAFYの領域の活動を評価するための生化学的分析.

主要な成果:

LEAFYのDNA結合ドメインは主に保存されていますが,異なる活性を示しています.
より急速に進化したLEAFYタンパク質の領域は,その生化学的活動に最小限の影響を及ぼします.
LEAFYの機能的差異は,主に保存されたDNA結合領域と関連しています.

結論:

アンジオスペルマにおけるLEAFYの特殊機能の進化は,そのDNA結合領域活動の変化と関連しています.
急速に発展している地域は,LEAFYの機能的専門化に大きく貢献しません.
LEAFYの進化を理解することは,植物の生殖戦略の移行についての洞察を提供します.

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