モデル原細胞における遺伝子ポリマーのテンプレート誘導合成
Sheref S Mansy1, Jason P Schrum, Mathangi Krishnamurthy
1Howard Hughes Medical Institute, Department of Molecular Biology and the Center for Computational and Integrative Biology, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Nature
|June 6, 2008
まとめ
脂肪酸膜を持つ原始的な原細胞は,現代の細胞とは異なり,栄養素を吸収することができました. これは,初期の生命は異質的であり,複雑な輸送システムなしに環境資源を利用していた可能性があることを示唆しています.
科学分野:
- 生命の起源の研究は,生命の起源に関する研究である.
- 初期の膜の生体物理学
- プロトセル研究について
背景:
- 現代の細胞膜は,極性/電荷を持つ分子に対する障壁であり,タンパク質輸送機を必要とします.
- このバリア機能は,生命の初期段階と異質性潜在能力を理解することを複雑にする.
- フォスフォリピド膜には,成長と分裂のためのダイナミックな特性がない.
研究 の 目的:
- 栄養素の吸収のためのプレバイオティック的に妥当な膜の浸透性を調査する.
- 初期の原細胞が,輸送装置なしで異質的であった可能性があるかどうかを決定する.
主な方法:
- プロトセル膜のモデルとして脂肪酸ベースのベジクルを使用した.
- 充電された分子,特にニュクレオチドがこれらの膜を横断する経路を調査しました.
- カプセル化されたコンテンツのテンプレートコピーする能力を評価した.
主要な成果:
- 脂肪酸膜は,ニュクレオチドのような有電荷分子に対する透過性を示した.
- 活性化された核酸は,自発的に膜を横切って,原細胞の内部へと移動した.
- プロトセル内で効率的なテンプレート複製が行われ,機能的吸収が示された.
結論:
- プレバイオティクスの可能性のある膜は,複雑な輸送システムなしで栄養素の吸収を促進します.
- 初期の原細胞は,環境の吸収に依存して,義務的異質栄養素であったかもしれない.
- 脂肪酸膜は,早期の細胞生命と代謝の実行可能なモデルを提供します.
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