亜鉛指は,Xenopus TFIIIAIAのRNAとDNAを結合する
O Theunissen1, F Rudt, U Guddat
1Max Planck Institute for Molecular Genetics, Otto Warburg Laboratory, Berlin, Germany.
Cell
|November 13, 1992
まとめ
転写因子IIIA (TFIIIA) は,その9本の亜鉛指を使って5SDNAと5SRNAの両方を結合します. DNAとRNAの結合には異なる指のセットが必要ですが,タンパク質はそれぞれ異なるメカニズムを使用します.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 遺伝学 遺伝学とは
背景:
- 転写因子IIIA (TFIIIA) は5SリボソームRNA遺伝子転写に不可欠である.
- TFIIIAには,DNA結合を媒介することが知られている9つのタンデム亜鉛指リピートが含まれています.
研究 の 目的:
- 5S DNAと5S RNAの両方にTFIIIAの結合における個々の亜鉛指の繰り返しの役割を調査する.
- TFIIIAのDNAとRNAの結合機能が分離可能であり,機械的に異なるかどうかを判断する.
主な方法:
- TFIIIAの亜鉛指の組み合わせの体系的な機能分析.
- DNAとRNAの相互作用のための比較結合測定法.
主要な成果:
- 亜鉛指の繰り返しのほとんどは,すべてではないが,DNAとRNAの結合に寄与する.
- DNAとRNAの認識には,異なる最小限の亜鉛指が必要である.
- 5S RNAの配列ではなく,二次/三次構造がTFIIIA結合の鍵です.
- 指6は,他の亜鉛指と比較して,明確なRNA結合特性を示しています.
結論:
- TFIIIAの亜鉛指配列は,重なり合うが分離可能なDNAとRNAの結合機能を媒介する.
- TFIIIAによるDNAとRNAの結合には,根本的に異なる分子機構が含まれています.
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