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アクチン細胞骨格とアスガードの複雑な細胞構造
Thiago Rodrigues-Oliveira1, Florian Wollweber2, Rafael I Ponce-Toledo1
1Department of Functional and Evolutionary Ecology, Archaea Biology and Ecogenomics Unit, University of Vienna, Vienna, Austria.
Nature
|December 21, 2022
まとめ
ユカリオットの最も近い親類であるアスガルドのアーカイアには,複雑なアクチンベースの細胞骨格があります. この発見はこれらの細胞骨格構造が ユカリオットより前に存在し アスガルドの古生物の進化に不可欠であったことを示唆している.
科学分野:
- 微生物学
- 進化生物学
- 細胞生物学
背景:
- アスガルドの古生物は ユカリオットの最も近い親類です
- 彼らのゲノムにはユーカリオットのシグネチャータンパク質 (ESP) が含まれており,初期ユーカリオットの進化における役割を示唆している.
- 細胞骨格形成におけるESPの機能は仮説化されているが,視覚化されていない.
研究 の 目的:
- アスガルドの古生物の細胞構造と 細胞骨格を調査する
- アスガルド古生物における真核シグネチャータンパク質 (ESP) の役割を視覚化する.
- アスガルドのアーカイアにおける 細胞骨格の進化的意味を理解する
主な方法:
- アスガルドのアーカイオンである"Candidatus Lokiarchaeum ossiferum"の培養
- 高解像度画像のための冷凍電子トモグラフィー
- タンパク質の成分を特定するための免疫補給
主要な成果:
- だって... L. ossiferumは,細胞体と突起全体に複雑な長距離細胞骨格を持っています.
- 細胞骨格の繊維は,F-アクチンと一致する歪んだ二重鎖構造を示しています.
- 免疫検査では ローキアクチンという 高い保全度を持つESPが これらのフィラメントに含まれていることが確認されました
- 細胞は枝分かれした突起と 複雑な表面構造を持つ単一膜の細胞包膜を示した.
結論:
- アスガルドの古生物は ユカリオットの出現以前から アクチン基の複雑な細胞骨格が存在していた.
- この細胞骨格は アスガルドの古代生物の進化の過程で 複雑な細胞構造の構築に 重要な役割を果たしたようです
- この発見はESPの機能の直接的な視覚化を提供し,真核細胞の複雑な進化の根源を支持する.
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