3'スプライス部位の変異は,分裂酵母におけるU1 snRNAの補償基変化によって抑制することができます
C I Reich1, R W VanHoy, G L Porter
1University of Illinois, Department of Biochemistry, Urbana 61801.
Cell
|June 26, 1992
まとめ
U1小核RNA (snRNA) が3'スプライス部位AGとペアリングすることは,酵母における効率的なイントロンスプライシングに不可欠です. U1 snRNAの補償変異はスプライシングを回復し,祖先のRNAスプライシングメカニズムとの進化的リンクを明らかにします.
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
- 遺伝学 遺伝学とは
背景:
- U1小核RNA (snRNA) は,前メッセンジャーRNAの5'スプライス部位と相互作用する重要なスプライシング因子です.
- 効率的なスプライシングは,イントロン内のスプライスサイトの正確な認識に依存しています.
研究 の 目的:
- Schizosaccharomyces pombe intronsのスプライシングにおける3'スプライスサイトAGとのU1snRNA相互作用の役割を調査する.
- 3'スプライス部位における突然変異とU1 snRNAの補償的な変化の機能的影響を調査する.
主な方法:
- スキゾサカロマイセス・ポンベの人工イントロンを利用して,スプライシング効率を研究した.
- 3'AGスプライス部位に変異を導入し,U1snRNA (C7とU8) に補償変異を導入した.
- 線形前駆物質の蓄積とラリアット形成を含む,分析されたスプライシング中間物質.
主要な成果:
- 3'AGスプライス部位の変異は,スプライシングの最初のステップをブロックし,線形前体蓄積につながった.
- U1 snRNA核酸C7とU8の補償的な変化により,ラリアト形成が部分的に回復した.
- U1 snRNAの変異は致命的であった (C7) または,成長障害と前駆体蓄積 (U8) を引き起こした.
結論:
- U1 snRNAと3'スプライスサイトAGの相互作用は,S. pombe.の効率的なスプライシングに不可欠です.
- この相互作用は,種間のAG依存のスプライシングにおける保存されたメカニズムを強調しています.
- この発見は,古代の分子内RNA相互作用が,U1 snRNA媒介のスプライシングに先行した可能性があることを示唆している.
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There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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