リボスイッチは,Bacillus subtilisや他の細菌の基本的な生化学的経路を制御する

Maumita Mandal¹, Benjamin Boese, Jeffrey E Barrick

¹Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06520, USA.

Cell

|June 6, 2003

まとめ

研究者らは,グアナインを感知し,バチルス・サブティリスの遺伝子発現を調節する新しいリボスイッチを発見した. これらのRNA分子は,タンパク質の関与なしに,重要な代謝経路を制御します.

科学分野:

分子生物学は分子生物学である.
遺伝学遺伝学とは
バイオケミストリーバイオケミストリー

背景:

リボスイッチは,メッセンジャーRNA (mRNA) の調節要素で,小分子 (リガンド) を結合して遺伝子発現を制御する.
リガンド結合はリボスイッチの構造変化を誘導し,転写または翻訳を変化させます.
リボスイッチの機能を理解することは,様々な生物における遺伝子調節を解読する上で極めて重要です.

研究の目的:

グアニンの高特異性を持つ新しいリボスイッチを特定し,特徴づけること.
バチルス・サブティリスにおけるこれらのグアナイン感知リボスイッチの役割を調査する.
細菌における代謝経路調節に対するリボスイッチの貢献を調査する.

主な方法:

潜在的なリボスイッチ候補者を特定するためのバイオ情報分析.
バイオケミカルアッセイにより,リガンド結合特異性と親和性を決定する.
特定されたリボスイッチの in vivo 機能を評価するために,バチルス・サブティリスの遺伝子分析.

主要な成果:

高親近性 (飽和度5nM) でグアニンを選択的に結合するリボスイッチの新種の分類.
これらのリボスイッチの局所化は,少なくとも5つの転写ユニットにわたってバチルス・サブティリスに存在します.
これらのリボスイッチは, purin 輸送と生物合成に関与する17の遺伝子を調節します.

結論:

リボスイッチは精密なメタボライトセンサーとして機能し,タンパク質コファクターなしで遺伝子発現を調節します.
グアニンを感知するリボスイッチは,Bacillus subtilis.のピューリン代謝において重要な役割を果たします.
リボスイッチは,細菌の基本的な代謝経路を制御する規制ネットワークの不可欠な構成要素です.

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