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活化ピリミジンリボヌクレオチドの合成は, prebiotically 妥当条件で可能である
Matthew W Powner1, Béatrice Gerland, John D Sutherland
1School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Nature
|May 16, 2009
まとめ
研究者らは,生命の起源における重要なステップである活性化ピリミジンリボヌクレオチドを生成するための新しい化学経路を示しています. このRNA世界仮説の研究は,理にかなったプリバイオティック分子と条件を用いて,問題のあるフリーリボゼとヌクレオベースを回避します.
科学分野:
- *生命の起源の研究について
- * プリバイオティック化学
- * 分子進化による分子進化
背景:
- *RNA世界仮説は,RNAを初期の情報ポリマーとして仮定している.
- * RNAの構成要素を合成する以前の試みは,リボース形成と核塩基添加の課題に直面した.
- * カノニカルピリミジン核塩基は,リボースに効率的に添加されません.
研究 の 目的:
- *活性化ピリミジンリボヌクレオチドを合成するための代替経路を調査する.
- * プラズブルなプレバイオティック原料の分子と反応条件を特定する.
- * プレバイオティクスの合成における無機リン酸の役割を調査する.
主な方法:
- * 活性化ピリミジンリボヌクレオチドの合成は,フリーリボースとヌクレオベースをバイパスする配列を通じて行われます.
- * プレバイオティック原料分子の利用:シアナミド,シアノアセチレン,グリコアルデヒド,グリセラルデヒド,および無機リン酸塩.
- * 反応中間物質の調査:アラビノースアミノオクサゾリンとアンヒドロン核酸.
主要な成果:
- *新しい短い配列による活性化ピリミジンリボヌクレオチドの成功形成.
- * アラビノースアミノオクサゾリンとアンヒドロヌクレオシドを主要中間物質として特定した.
- * 合成全体を通して無機リン酸塩の不可欠な触媒およびバッファリングの役割を実証した.
結論:
- * 提案された経路は,初期の地球条件下でRNA前駆体への実行可能な経路を提供します.
- * 無機リン酸は,プレバイオティクスの化学システムにおいて,重要な,多面的な役割を果たします.
- * 生命の起源の研究における混合化学システムの重要性を強調する.
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