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Complementation of Splicing Activity by a Galectin-3 - U1 snRNP Complex on Beads
Published on: December 9, 2020
U6小核RNAによる金属イオン調整は,スプライセソームの触媒に寄与する
S L Yean1, G Wuenschell, J Termini
1Department of Molecular Biology, Beckman Research Institute of the City of Hope, Duarte, California 91010-3011, USA.
Nature
|December 29, 2000
まとめ
スプライソーム内の小さな核RNA (snRNA) は,前伝達 RNA スプライシングに不可欠です. この研究は,U6 snRNAが,スプライセソームにとって不可欠な,触媒性金属イオンを調整することを明らかにしています.
科学分野:
- 分子生物学は分子生物学である.
- RNA 生物学 RNA 生物学
- バイオケミストリー バイオケミストリー
背景:
- プレメッセンジャーRNAのスプライシングは,スプライセソーム内の2つの連続したフォスフォ-トランスエステル化反応を経由して発生します.
- スプライソーム内の小核RNA (snRNA) の触媒的役割は未解決のままである.
- スプライセソームはメタロ酵素として機能し,snRNAによる金属イオン協調の調査を必要とします.
研究 の 目的:
- スプライセソーム内の触媒性金属イオンを snRNA が調整するかどうかを判断する.
- U6 snRNAの金属イオン協調とスプライソームの触媒活性における役割を調査する.
主な方法:
- U6 snRNAのサイト指向型変異は,橋渡し機能のないホスフォリル酸素を核酸U80.0で硫黄に置き換えることで行われます.
- 修正されたU6 snRNA. spliceosomesの復元.
- 異なる二価金属イオン (Mg2+とMn2+) を用いてスプライソームの触媒活性測定.
主要な成果:
- U80 (U6/sU80) で硫黄の置換を伴うU6 snRNAは,Mg2+を持つ不活性なスプライソームを再構成する.
- Mn2+の添加により,U6/sU80(Sp) スプライソームの触媒活性が回復するが,U6/sU80(Rp) は回復しない.
- Mg2+は,Mn2+で救出された反応を競争力的に阻害し,金属結合部位が保存されていることを示している.
結論:
- 酵母U6 snRNAは,スプライソームの触媒活性に不可欠な金属イオンを直接調整する.
- U6 snRNAによるこの金属イオン調整は,スプライセソーム内のRNA触媒の仮説を支持する.
- U6/U80の金属結合部位は,金属イオンに対する変化した要求を示し,スプライシング中の動的構造変化を示唆しています.
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