Prp8の結晶構造は,スプライセソームの活性部位腔を明らかにする
Wojciech P Galej1, Chris Oubridge, Andrew J Newman
1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
Nature
|January 29, 2013
まとめ
スプライセオソームは,
科学分野:
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
- バイオケミストリー バイオケミストリー
背景:
- スプライセソームは,遺伝子発現に不可欠な大きな分子マシンです.
- Prp8タンパク質は,スプライソーム内のU5小さな核リボ核タンパク質粒子の重要な成分です.
- Prp8は,RNAと前伝達 RNAを含むスプライソームの触媒核と広範に相互作用する.
研究 の 目的:
- イースト Prp8 の結晶構造を Aar2.2 の複合体で決定する.
- スプライソームの触媒核とPrp8の相互作用の構造的基礎を解明する.
- 核前mRNAスプライシングとIIグループイントロンスプライシングの進化的関係についての洞察を提供するためです.
主な方法:
- 酵母 Prp8 (残留物885-2413) がAr2.2に結合する構造を決定するために,X線結晶学を用いた.
- 構造分析は,Prp8内のドメインとその空間的配置を特定することに焦点を当てました.
- 既知の機能的部位のマッピング (変異抑制剤とクロスリンクを含む) が,決定された構造にマッピングされる.
主要な成果:
- 結晶構造は,Prp8内の密接に関連したドメインを明らかにし,細菌IIグループイントロン逆転写酵素とII型制限エンドヌクレアゼに似ている.
- 特定Prp8ドメインによって形成された大きな穴が特定され,IIグループイントロンRNAの触媒核を収容できる.
- スプライスサイト変異とイントロンスプライシングに関連した機能的部位は,この空洞に局所化された.
結論:
- Prp8の構造は,スプライソームの活性部位の構造について重要な洞察を提供します.
- この発見は,核前mRNAスプライシングとIIグループイントロンスプライシングの共通の進化的起源を支持する.
- 特定された穴は,スプライソーム内のRNA触媒の潜在的なメカニズムを示唆しています.
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